Academic literature on the topic 'Sequestrant'
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Journal articles on the topic "Sequestrant"
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Daufin, Georges, Uzi Merin, François-Louis Kerherve, Jean-Pierre Labbe, Auguste Quemerais, and Charles Bousser. "Efficiency of cleaning agents for an inorganic membrane after milk ultrafiltration." Journal of Dairy Research 59, no. 1 (February 1992): 29–38. http://dx.doi.org/10.1017/s0022029900030211.
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SummaryCleaning of inorganic membranes after ultrafiltration (UF) of skim milk has been assessed using hydraulic, physicochemical and spectroscopic (i.r. and X-ray photoelectron spectroscopy) measurements. A cleaning sequence using hypochlorite alone or hypochlorite followed by HNO3 restored the membrane hydraulic resistance, in contrast to cleaning with HNO3 alone. When using NaOH, addition of Ca complexants (EDTA, gluconate, tripolyphosphate) and surfactants was required to obtain similar results. Three types of criteria (hydraulic, kinetic, chemical) are available to assess the effect of the sequestrant and surfactant types. In all the cases studied, traces of protein and Ca were detected on and within the membrane after cleaning. Nevertheless, it was concluded that it is possible to develop a single-step alkaline product to clean inorganic milk UF membranes if suitable surfactants and Ca sequestrants are included in its formula.
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Houlston, R., J. Quiney, G. F. Watts, and B. Lewis. "Gemfibrozil in the Treatment of Resistant Familial Hypercholesterolemia and Type III Hyperlipoproteinaemia." Journal of the Royal Society of Medicine 81, no. 5 (May 1988): 274–76. http://dx.doi.org/10.1177/014107688808100512.
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The efficacy of gemfibrozil in the treatment of resistant familial hypercholesterolaemia and type III hyperlipoproteinaemia was evaluated in 26 individuals over a mean period of 16 months. In the untreated state both disorders are associated with a high frequency of coronary heart disease. In the former, gemfibrozil with a bile acid sequestrant reduced plasma cholesterol by 32%, an incremental decrease of 17% compared with sequestrant therapy alone. In type III, plasma cholesterol was reduced by 40% and plasma triglyceride by 70%, while high-density lipoprotein cholesterol increased by 45%. In none of the patients studied did clinical or biochemical side effects occur.
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Tziomalos, Konstantinos, Asterios Karagiannis, Dimitri P. Mikhailidis, and Vasilios G. Athyros. "Colesevelam: A New and Improved Bile Acid Sequestrant?" Current Pharmaceutical Design 19, no. 17 (April 1, 2013): 3115–23. http://dx.doi.org/10.2174/1381612811319170019.
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Qian, Jian, Bradley P. Sullivan, and Cory Berkland. "pH-Responsive Micelle Sequestrant Polymers Inhibit Fat Absorption." Biomacromolecules 16, no. 8 (July 17, 2015): 2340–46. http://dx.doi.org/10.1021/acs.biomac.5b00560.
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Bays, H. E., K. C. Maki, and K. Schmitz. "The Bile Acid Sequestrant Acceptability Scale validation study." International Journal of Clinical Practice 64, no. 10 (July 5, 2010): 1393–97. http://dx.doi.org/10.1111/j.1742-1241.2010.02467.x.
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Manghat, Padmini, and Anthony S. Wierzbicki. "Colesevelam hydrochloride: a specifically engineered bile acid sequestrant." Future Lipidology 3, no. 3 (June 2008): 237–55. http://dx.doi.org/10.2217/17460875.3.3.237.
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Potthoff, Matthew J., Austin Potts, Tianteng He, João A. G. Duarte, Ronald Taussig, David J. Mangelsdorf, Steven A. Kliewer, and Shawn C. Burgess. "Colesevelam suppresses hepatic glycogenolysis by TGR5-mediated induction of GLP-1 action in DIO mice." American Journal of Physiology-Gastrointestinal and Liver Physiology 304, no. 4 (February 15, 2013): G371—G380. http://dx.doi.org/10.1152/ajpgi.00400.2012.
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Bile acid sequestrants are nonabsorbable resins designed to treat hypercholesterolemia by preventing ileal uptake of bile acids, thus increasing catabolism of cholesterol into bile acids. However, sequestrants also improve hyperglycemia and hyperinsulinemia through less characterized metabolic and molecular mechanisms. Here, we demonstrate that the bile acid sequestrant, colesevelam, significantly reduced hepatic glucose production by suppressing hepatic glycogenolysis in diet-induced obese mice and that this was partially mediated by activation of the G protein-coupled bile acid receptor TGR5 and glucagon-like peptide-1 (GLP-1) release. A GLP-1 receptor antagonist blocked suppression of hepatic glycogenolysis and blunted but did not eliminate the effect of colesevelam on glycemia. The ability of colesevelam to induce GLP-1, lower glycemia, and spare hepatic glycogen content was compromised in mice lacking TGR5. In vitro assays revealed that bile acid activation of TGR5 initiates a prolonged cAMP signaling cascade and that this signaling was maintained even when the bile acid was complexed to colesevelam. Intestinal TGR5 was most abundantly expressed in the colon, and rectal administration of a colesevelam/bile acid complex was sufficient to induce portal GLP-1 concentration but did not activate the nuclear bile acid receptor farnesoid X receptor (FXR). The beneficial effects of colesevelam on cholesterol metabolism were mediated by FXR and were independent of TGR5/GLP-1. We conclude that colesevelam administration functions through a dual mechanism, which includes TGR5/GLP-1-dependent suppression of hepatic glycogenolysis and FXR-dependent cholesterol reduction.
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Walters, Julian R. F., Ramesh Arasaradnam, and H. Jervoise N. Andreyev. "Diagnosis and management of bile acid diarrhoea: a survey of UK expert opinion and practice." Frontline Gastroenterology 11, no. 5 (September 11, 2019): 358–63. http://dx.doi.org/10.1136/flgastro-2019-101301.
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ObjectiveBile acid diarrhoea (BAD), which includes bile acid malabsorption, causes a variety of digestive symptoms. Diagnostic rates and management vary considerably. We conducted a survey of current practice to review expert opinion and provide guidance on diagnosis and management.Design/methodAn online survey was conducted of clinical members of the UK Bile Acid Related Diarrhoea Network, who had all published research on BAD (n=21). Most were National Health Service consultants who had diagnosed over 50 patients with the condition.ResultsThe preferred terminology was to use BAD, with primary and secondary to classify causes. A wide range of presenting symptoms and associated conditions were recognised. SeHCAT (tauroselcholic acid) was the preferred diagnostic test, and 50% of respondents thought general practitioners should have access to this. Patients who met the Rome IV diagnostic criteria for functional diarrhoea, irritable bowel syndrome (IBS) with predominant diarrhoea or postcholecystectomy diarrhoea were usually investigated by SeHCAT, which was used sometimes in other types of IBS. Treatment with a bile acid sequestrant was offered to patients with low SeHCAT values, with expected response rates >70% in the most severe. Colestyramine was the usual sequestrant, starting between 2 g and 8 g daily; colesevelam was an alternative. In patients who had an incomplete response, increasing the dose, changing to an alternative sequestrant, use of loperamide and a low fat diet were suggested. Recommendations for follow-up and to improve the overall patient experience were made.ConclusionThis expert survey indicates current best practice in the diagnosis and management of BAD.
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Adio, Jitka, and Jennie Burch. "Chronic diarrhoea due to bile salt malabsorption: nurse-led assessment, medical treatment and dietary management." Gastrointestinal Nursing 18, no. 1 (February 2, 2020): 26–31. http://dx.doi.org/10.12968/gasn.2020.18.1.26.
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Bile salt malabsorption (BSM) occurs when bile salts, which are secreted in the small bowel to aid digestion of fats and vitamins, are not sufficiently re-absorbed in the terminal ileum. Consequently, an excess of bile salts enters the colon, causing chronic explosive diarrhoea, associated with abdominal cramps, flatulence and urgent, frequent and unpredictable bowel habits. BSM affects around 1% of the population, often occuring in ileal Crohn's disease or after ileal resection. Diagnosis begins with a nurse-led assessment, including blood and stool tests, to exclude other potential organic causes of chronic diarrhoea. BSM can then be confirmed and classified with a 75Se-homocholic acid taurine (SeHCAT) scan. BSM can be treated medically with bile salt sequestrants, including colestyramine sachets, which are approved but have an unpleasant taste, and colesevelam tablets, which are more tolerable but more expensive and not yet approved. However, long-term sequestrant use can impact absorption of vitamins and other medications. BSM can also be managed with a low-fat diet, which is cost-effective and can reduce the amount of bile secreted. Nurses should provide patient education to ensure adherence and safe use.
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Takahashi, Shogo, Yuhuan Luo, Suman Ranjit, Cen Xie, Andrew E. Libby, David J. Orlicky, Alexander Dvornikov, et al. "Bile acid sequestration reverses liver injury and prevents progression of nonalcoholic steatohepatitis in Western diet–fed mice." Journal of Biological Chemistry 295, no. 14 (February 19, 2020): 4733–47. http://dx.doi.org/10.1074/jbc.ra119.011913.
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Nonalcoholic fatty liver disease is a rapidly rising problem in the 21st century and is a leading cause of chronic liver disease that can lead to end-stage liver diseases, including cirrhosis and hepatocellular cancer. Despite this rising epidemic, no pharmacological treatment has yet been established to treat this disease. The rapidly increasing prevalence of nonalcoholic fatty liver disease and its aggressive form, nonalcoholic steatohepatitis (NASH), requires novel therapeutic approaches to prevent disease progression. Alterations in microbiome dynamics and dysbiosis play an important role in liver disease and may represent targetable pathways to treat liver disorders. Improving microbiome properties or restoring normal bile acid metabolism may prevent or slow the progression of liver diseases such as NASH. Importantly, aberrant systemic circulation of bile acids can greatly disrupt metabolic homeostasis. Bile acid sequestrants are orally administered polymers that bind bile acids in the intestine, forming nonabsorbable complexes. Bile acid sequestrants interrupt intestinal reabsorption of bile acids, decreasing their circulating levels. We determined that treatment with the bile acid sequestrant sevelamer reversed the liver injury and prevented the progression of NASH, including steatosis, inflammation, and fibrosis in a Western diet–induced NASH mouse model. Metabolomics and microbiome analysis revealed that this beneficial effect is associated with changes in the microbiota population and bile acid composition, including reversing microbiota complexity in cecum by increasing Lactobacillus and decreased Desulfovibrio. The net effect of these changes was improvement in liver function and markers of liver injury and the positive effects of reversal of insulin resistance.
Dissertations / Theses on the topic "Sequestrant"
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SILVA, Matheus Gomes. "Estudo da estabilidade de triazinana sob condi??es de processamento para o sequestro de H2S." Universidade Federal Rural do Rio de Janeiro, 2016. https://tede.ufrrj.br/jspui/handle/jspui/1419.
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The Hidrogen sulfide is one of the substances most dangers in the oil and gas production. The H2S causes great economic losses to industries and so their removal is desired. The use of the triazine to remove the H2S has been extensively documented in the literature. However, the number of products that present the physical and chemical properties desired to act as H2S scavenger, available in the market, is reduced. For this reason, the search by molecules that act in removing of H2S has been the object of research in the worldwide. The goal of this work was investigate the thermal stability of two different H2S scavengers: 1,3,5-tris (hydroxyethyl) hexahydro-s-triazine (commercial) and 1,3,5-tris (hydroxypropyl) hexahydro-s-triazine (synthesized in our laboratory ) when they are subject to processing condition in a pilot plant. To achieve this goal was built a pilot plant capable of simulating some operating conditions of the pre-salt exploration, such as temperature, shear rate and residence time. The thermal stability (degradation) of the triazines was investigated by monitoring the conductivity of the samples. For comparison purposes were performed condutimetry tests of samples in bench tests in the laboratory and pilot plant at temperatures of 30?C, 40?C, 50?C, 60?C and 80?C. For both triazines, the conductivity values obtained in the pilot plant is much higher than those found in bench tests: 65.1 S/cm (2C) and 65.1 S/cm (3C) and 45.5 S/cm (2C), and 32.1 S/cm (3C) respectively. The results showed that the conductivity values are strongly affected by the processing time, being more evident differences in their bench tests. The results of monitoring the conductivity of the samples allowed to verify that the 1,3,5-tris (hydroxyethyl) hexahydro-s-triazine (commercial) and 1,3,5-tris (hydroxypropyl) hexahydro-s- triazine (synthesized in our laboratory) does not undergo degradation under the process conditions which have been subjected, either in bench tests or plant pilot.
O sulfeto de Hidrog?nio ? uma das subst?ncias mais perigosas na produ??o de petr?leo e g?s. O H2S provoca grandes perdas econ?micas para as ind?strias e assim a sua remo??o ? desejada. O uso da triazina para remover o H2S tem sido extensivamente documentado na literatura. No entanto, o n?mero de produtos que apresentam propriedades f?sicas e qu?micas desejadas para actuar como eliminador de H2S, dispon?vel no mercado, ? reduzida. Por esta raz?o, a busca por mol?culas que atuem na remo??o de H2S tem sido o objeto de pesquisa no mundo inteiro. O objectivo deste trabalho foi o de investigar a estabilidade t?rmica de duas diferentes sequestrantes de H2S: 1,3,5-tris (hidroxietil) hexa-hidro-s-triazina (comercial) e 1,3,5-tris (hidroxipropil) hexa-hidro-s-triazina (sintetizada em laborat?rio), quando eles est?o sujeitos a condi??o de processamento em uma planta piloto. Para atingir este objetivo foi constru?da uma planta piloto capaz de simular algumas condi??es de processamento da explora??o do pr?-sal, tais como temperatura, taxa de cisalhamento e tempo de resid?ncia. A estabilidade t?rmica (degrada??o) das triazinas, foi investigada atrav?s da monitoriza??o da condutividade das amostras. Para fins de compara??o foram realizados testes condutimetria de amostras em ensaios de bancada de laborat?rio e na planta piloto nas temperaturas de 30?C, 40?C, 50?C, 60?C e 80?C. Para ambas as triazinas, os valores de condutividade obtidos na instala??o piloto ? muito mais elevado do que aqueles encontrados no banco: 65,1 S/cm (2c) e 65,1 S/cm (3C) e 45,5 S/cm (2C), e 32,1 S/cm (3C), respectivamente. Os resultados mostraram que os valores de condutividade s?o fortemente afetados pelo tempo de processamento, sendo as diferen?as mais evidentes em seus testes de bancada. Os resultados da monitoriza??o da condutividade das amostras permitiram verificar que o 1,3,5-tris (hidroxietil) hexa-hidro-s-triazina (comercial) e 1,3,5-tris (hidroxipropil) hexa-hidro-triazina S- (sintetizado no nosso laborat?rio) n?o sofre degrada??o sob as condi??es de processo que foram sujeitos, tanto em testes de bancada ou planta piloto
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Furyk, Steven Michael. "Studies of phase separable soluble polymers." Texas A&M University, 2003. http://hdl.handle.net/1969.1/3860.
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The technique of phase labeling has the ability to greatly enhance synthetic
protocol by simplifying purification and increasing efficiency. Traditional insoluble
supports offer efficient and simple recovery of the Âphase tagged material but suffer
from problems inherent to their heterogeneous nature. A solution to these problems has
been to utilize phase separable soluble polymers in the design of Âsmart responsive
systems that offer the option of homogenous reaction conditions with heterogeneous
separation conditions. The subject of this dissertation focuses on the application of
soluble polymeric phase tags in systems where the miscibility between solid-liquid and
liquid-liquid systems is thermally induced.
Low molecular weight poly(ethylene glycol) (PEG) oligomers were investigated
as phase anchors for SCS palladacycle catalysts. The oligomeric PEG chains were
sufficient to engender polar phase solubility in a heptane-DMA thermomorphic system.
Microwave irradiation of these thermomorphic mixtures of palladium complexes and
substrates was a viable scheme to recycle and significantly shorten reaction times for
simple Heck reactions of aryl iodides. Soluble polymeric supports possessing a lower critical solution temperature
(LCST) were utilized in the sequestration of the S-triazine herbicide, atrazine, from
contaminated water samples. The ability of poly(N-isopropylacrylamide) to sequester
hydrophobic guests like atrazine was examined. A functionalized PNIPAM derivative
containing secondary cyclic amines exhibited superior sequestration ability that was
credited to the covalent binding of the atrazine.
In order to facilitate the design of tailored, thermally responsive, smart polymers,
a high throughput temperature gradient microfluidic device was used to obtain LCST
data in a fast, accurate manner. The specific ion effects of various alkali metal halide
salts on the LCST of PNIPAM were investigated. The high precision in the
measurements enabled more subtle effects such as changes in solvent isotope, polymer
microstructure, molecular weight, and importance of end group effects on the LCST of
poly(N-alkylacrylamide)s to be evaluated.
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Benson, Gregory Martin. "Studies on bile acid sequestrants and bile acid metabolism in the hamster." Thesis, Royal Veterinary College (University of London), 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.518089.
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SANTOS, Ivan Alberto Palheta. "Farelo de dendê como aditivo sequestrante de umidade na silagem de capim-elefante." Universidade Federal do Pará, 2013. http://repositorio.ufpa.br/jspui/handle/2011/8443.
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Objetivou-se com esse trabalho fazer uma revisão bibliográfica sobre o uso de aditivos sequestrantes de umidade, assim como o uso do farelo de dendê como aditivo para silagens de capim-elefante, após isso, houve um experimento científico em que avaliou-se o efeito da adição de farelo de dendê como aditivo sequestrante de umidade na silagem de capim-elefante. As características químicobromatológicas e fermentativas foram analisadas em delineamento inteiramente casualizado, com seis tratamentos e seis repetições onde as médias dos resultados dos dias de fechamento e de abertura foram analisados por meio de análise de regressão. Nas análises de estabilidade aeróbia empregou-se esquema de parcelas subdivididas, de modo que os tratamentos foram aleatorizados nas parcelas e os tempos de avaliação nas subparcelas. Coletaram-se amostras no momento da ensilagem e após 190 dias de armazenamento para avaliação dos teores de matéria seca, proteína bruta, carboidratos (totais, não-fibrosos, solúveis em água, celulose e hemicelulose), material mineral, lignina e extrato etéreo. Nos dias de aerobiose coletaram-se amostras para obter valores de pH, nitrogênio amoniacal, fungos e leveduras. O capim-elefante deste experimento apresentou valores de 13,9% de MS e 8,25% de PB enquanto que o FD possui 77,2% de MS e 16,9% de PB. A inclusão de FD teve influência direta nas populações de fungos e leveduras durante a fase de estabilidade aeróbia, quanto maior a dose, menor a proliferação, em consequência disso, os valores de pH e N-NH3 também apresentaram comportamento semelhante. A inclusão do farelo de Dendê em doses entre 10% a 15% podem ser usadas em silagens de capim-elefante, inibindo fermentações indesejáveis e tornando-as mais estáveis, doses acima deste valor podem comprometer o valor nutritivo da silagem pelo alto teor de lignina do aditivo.
The objective of this work to review existing literature on the use of additives sequestering moisture, as well as the use of palm kernel meal as a additive for elephant-grass silage, after that, there was a scientific experiment in which we evaluated the effect of adding bran oil palm as an wet kidnapper additive in elephantgrass silage. The chemical qualitative and fermentation were analyzed in a completely randomized design with six treatments and six replications, where the averages of the results of days of closing and opening were analyzed by regression analysis. In the aerobic stability analysis was employed subdivided plots, so that the treatments were randomized in plots and the evaluation times in the subplots. Samples were collected at the time of ensiling and after 190 days of storage for evaluation of dry matter, crude protein, carbohydrates (total, non-fibrous, watersoluble, cellulose and hemicellulose), mineral material, lignin and lipids. In the days aerobic samples were collected for pH, nitrogen for ammonia, fungi and yeasts. The elephant grass this experiment showed values of 13.9% DM and 8.25% CP while the FD has 77.2% DM and 16.9% CP. The inclusion of FD had a direct influence on the populations of fungi and yeasts during the aerobic stability, the higher the dose, the less proliferation as a result, the values of pH and NH3-N also showed similar behavior. The inclusion of bran Palm at doses in the range of 10% to 15% can be used in silage of elephant, inhibiting undesired fermentation and making them more stable, doses above this value may affect the nutritive value of silage by high lignin content of the additive.
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Antonio, Patricia. "Aditivos proteicos sequestrantes de umidade na ensilagem de gramíneas tropicais." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5895.
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The animal production potential grows fast and food production is always being challenged to meet this need in the nutrition as well as in the economic context. Forage plants are the basis of the diet of ruminants in most production systems in tropical regions. Forage availability varies during the year depending on weather conditions. It turns necessary to have stored forage to supplement the animals. Silage is the most widely used form of stored forage. The tropical grasses ensiling is an alternative to traditional silage crops because it can be used the surplus produced in the rainy season. However, the fermentation process can be altered by many factors, making difficult the production of good quality silage so there is the need of using additives as a means of improving the nutritional and fermentative quality of these types of silages. Thus, this study aimed to use moisture sequestering additives: soybean, canola, sunflower and cotton meal, in the production of B. brizantha silage in order to improve the nutritional value, fermentative value, degradability and digestibility of these silages, thus obtaining information about alternative materials for the production of good quality silage. The experiment was carried out a part in experimental PVC silos and estimated the bromatologic parameters, effluent and gas losses, N-NH3, pH, titratable acidity, protein fractions and silage degradability, and the other part in experimental silos with a capacity of 200 kg to evaluate the performance of sheep fed with these silages through intake and total tract digestibility of nutrients, metabolic and rumen parameters of these animals. The silages of Brachiaria brizantha with sequestering moisture additives were effective in keeping concentrations of plasma metabolic and ruminal profile parameters within the reference levels, increasing the readily soluble A fraction and decreasing the C protein fraction consequently improving the ruminal degradability, and reducing the silage losses. Therefore it is recommended its use as an alternative to ruminant nutrition.
O potencial de produção animal cresce num ritmo acelerado e a produção de alimentos está sempre sendo desafiada a suprir essa necessidade tanto no contexto nutricional quanto econômico. As plantas forrageiras constituem a base da dieta dos ruminantes na grande maioria dos sistemas de produção das regiões tropicais. A disponibilidade de forragem é variável durante o ano, dependendo de condições climáticas. Isto gera a necessidade de se ter forragem conservada sendo a silagem a forma mais utilizada. A ensilagem de capins tropicais é uma alternativa à ensilagem de culturas tradicionais podendo ser utilizada o excedente produzido na época das águas. No entanto, o processo fermentativo pode ser alterado por alguns fatores, dificultando a confecção de silagens de boa qualidade, havendo assim a necessidade do uso de aditivos como meio de melhora da qualidade nutricional e fermentativa desses tipos de silagens. Dessa forma, o presente trabalho visou utilizar aditivos sequestrantes de umidade: farelos de soja, canola, girassol e algodão, na confecção de silagens de Brachiaria brizantha com o objetivo de melhorar o valor nutritivo, valor fermentativo, degradabilidade e digestibilidade dessas silagens, obtendo assim, informações sobre materiais alternativos para a confecção de silagens de qualidade. O experimento foi realizado uma parte em silos experimentais de PVC e estimados os parâmetros bromatológicos, as perdas por efluentes, perdas por gases, N-NH3, pH, acidez titulável, frações proteicas e a degradabilidade da massa ensilada, e outra parte em silos experimentais com capacidade para 200 kg para avaliar o desempenho de ovinos alimentados com essas silagens, através de consumo e digestibilidade total dos nutrientes, parâmetros metabólicos e ruminais destes animais. As silagens de Brachiaria brizantha com aditivos sequestrantes de umidade foram eficientes em manter as concentrações dos metabólicos plasmáticos e parâmetros de perfil ruminal dentro dos níveis de referência, aumentar a fração A prontamente solúvel e diminuir a fração C da proteína consequentemente melhorando a degradabilidade ruminal, e diminuindo as perdas da silagem. Portanto sendo recomendado o seu uso como alternativa para a nutrição de ruminantes.
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MONCIOSO, N. A. P. "Estudo de sequestrantes de H2S em petróleo do Estado do Espírito Santo." Universidade Federal do Espírito Santo, 2011. http://repositorio.ufes.br/handle/10/4670.
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Silva, Camila Furtunato da. "Composição química e capacidade sequestrante de espécies reativas de oxigênio e nitrogênio de mel orgânico brasileiro." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/64/64135/tde-17102017-113409/.
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O Brasil apresenta grande potencial para a exploração da apicultura, dado ao seu vasto território e flora diversificada, o que permite diferentes variedades de méis com propriedades únicas. O estado do Paraná é um dos maiores produtores de méis do país e o investimento em produção que atenda aos mercados mais exigentes estimulou a produção do mel orgânico. O conhecimento desde a antiguidade sobre os efeitos benéficos à saúde pelo mel vem estimulando a pesquisa deste alimento nobre. Assim, este trabalho teve por objetivo estudar méis orgânicos brasileiros certificados (MO) para a caracterização do perfil fenólico, volátil, além da avaliação da capacidade de sequestro das espécies reativas de oxigênio e nitrogênio. Os méis foram coletados nos apiários de apicultores com certificação orgânica de dois municípios do sul do Paraná, General Carneiro e Turvo-PR. Nos ensaios foram utilizados extratos fenólicos dos méis, obtidos por meio da utilização da resina Amberlite® XAD®2, bem como méis brutos in natura. Os extratos apresentaram conteúdo de compostos fenólicos significativo, sendo o melato (MO5), de General Carneiro, o de maior teor (117,68± 4,40 mg EAG/g). Para as análises de sequestro das espécies reativas de oxigênio e nitrogênio, os extratos fenólicos foram sempre superiores aos méis brutos in natura. Os extratos fenólicos, de maneira geral, apresentaram alta capacidade de sequestro para o radical peroxila (ROOo), ácido hipocloroso (HOCl) e óxido nítrico (NOo). Em relação aos melatos, o extrato MO7 apresentou alta capacidade para o sequestro do HOCl (EC50= 4,83 ± 0,13 ?g/mL), enquanto que o MO5 foi melhor para o sequestro do NOo (EC50=2,16 ± 0,18 ?g/mL). Pelo método HPLC-ABTS on-line foi possível identificar e quantificar a contribuição para a atividade antioxidante do ácido ferúlico no extrato (MO1) e do flavonoide kanferol na amostra (MO4). O ácido ascórbico foi identificado e quantificado por HPLC somente nos melatos (MO3, MO5 e MO7). Pela técnica de LC-MS/MS foram identificados a presença dos seguintes compostos fenólicos: ácido caféico, rutina e hesperidina em todos os extratos. A análise de compostos voláteis por SPME-CG/EM mostrou a presença de dois compostos, encontrados apenas nos melatos, que foram o terpineno-4-ol, que possui ação antifúngica, antiparasitológica e anti-inflamatória; e o 3,4-dimetil-1-deceno, podendo assim serem utilizados como marcadores químicos destes méis. O conhecimento da composição química destes méis, bem como a composição fenólica bioativa, contribui para o fornecimento de antioxidantes naturais para a dieta, atenuando assim os efeitos negativos dos radicais livresBrazil has a great potential to explore beekeeping due to its vast territory and diversified flora, what allows different varieties of honeys with unique characteristics. Parana state is one of the largest honey producers and the investment in production that meets the most demanding markets stimulated the organic honey production. The knowledge since early in history regarding the beneficial health effects promoted by honey is stimulating the scientific research of this noble food. Thus, this paper aimed to study certified Brazilian organic honeys (MO) in order to determine the phenolic and volatile profiles, and also the evaluation of radical scavenging capacity against Nitrogen and Oxygen Reactive Species (RNS and ROS, respectively). The honeys were collected from apiaries from beekeepers with the organic certification from two municipalities of southern Parana, General Carneiro and Turvo, PR. In the essays, phenolic extracts were obtained from honeys by using Amberlite® XAD®2 resin, as well as crude in natura honeys. The extracts showed a significant content in phenolic compounds, with honeydew (MO5), from General Carneiro, showing the highest content (117,68 ± 4,40 mg AGE/g). For the analyzes to determine the radical scavenging capacity against RNS and ROS, the phenolic extracts always showed up superior results in comparison to crude in natura honeys. Phenolic extracts showed, in general, great capacity to scavenge peroxyl radical (ROOo), hypochlorous acid (HOCl) and nitric oxide (NOo). In relation to honeydews MO7 extract showed the highest capacity to scavenge HOCl (IC50= 4,83 ± 0,13 ?g/mL) while MO5 was the sample with better capacity to scavenge NOo (IC50=2,16 ± 0,18 ?g/mL). By using HPLC-ABTS on-line method it was possible to identify and to quantify the ferulic acid in MO1 extract, a compound with an important contribution to the antioxidant activity of this sample, as well as the flavonoid kaempferol in MO4 sample. Ascorbic acid was identified and quantified by HPLC only in the honeydew samples (MO3, MO5 and MO7). The analyzes developed by LC-MS/MS techniques indicated the presence of the phenolic compounds caffeic acid, rutin and hesperidin in all the extracts. The analysis of volatile substances developed by SPME-GC/MS promoted the identification of two compounds found only in the honeydew samples. The compounds were the terpinen-4-ol, which has antifungal, antiparasitological and anti-inflammatory activities; and 3,4-dimethyl-1-decene. Both compounds can be used as chemical markers of these honeys. The knowledge of the chemical composition of the studied honeys, as well as their bioactive phenolic composition, contributes to supply natural antioxidants to human diet, thus attenuating the negative effects of free radicals
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Bayerle, Douglas Fernando. "Mexilhão dourado (Limnoperna fortunei) na alimentação de frangos de corte utilizando tanino como sequestrante de metais pesados." Universidade Estadual do Oeste do Paraná, 2015. http://tede.unioeste.br:8080/tede/handle/tede/1579.
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Previous issue date: 2015-04-16Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The present work aimed to evaluate the use of tannins as adsorbent of heavy metals in broiler chicks fed diets with different levels of mussel flour inclusion in replacement of limestone of the feeding. Two experiments were divided in two phases with two assays each. In the first experiment we conducted a trial to evaluate the performance of broiler chicks from 1 to 21 days fed wattle tannin, using for it 720 Cobb-500 1-day-old male broiler chicks distributed in a completely randomized design with six treatments and six replicates of 20 birds in each experimental unit. The treatments were composed by basal diets with increasing levels of wattle tannin (0, 250, 500, 750, 1000, 1250 g/ton-1 of wattle tannin). The results showed that the use of 250 g/ton-1 of tannin was detrimental to performance, and morphometric measurements suffered no statistical difference using tannin in the diet. In the second trial, we evaluated the performance of broiler chicks from 1 to 21 days of age fed increasing levels (0, 25, 50, 75, 100%) of replacement of mussel meal by limestone in feeding and still supplementation or not of wattle tannin (250 g/ton-1 of wattle tannin) with 5 replicates per treatment. For that, 1200 Cobb-500 1-day-old male broiler chicks were housed in a completely randomized design, with 24 birds each. The results showed that the golden mussel has lot of calcium, low levels of heavy metals, and microbiological contamination did not present or is below the amounts allowed by law. For performance, the data demonstrated that the use of mussel can be performed up to 100% replacement of the limestone in feeding without affecting the variables, but the use of 250 g/ton-1 of wattle tannin was detrimental to the performance of broiler chicks. There was no influence on the use of mussel and tannin on the deposition of heavy metals in the body of birds. The variables, liver and kidneys showed the interaction between the tested diets. The bony features, just gray on fresh matter showed interaction between treatments. In the second experiment, the first test was to evaluate the performance of broiler chickens to the stage 21-42 days, fed with wattle tannin. For that, 648 Cobb-500 21-days-old male broilers were distributed in a completely randomized design, divided into six treatments and six replicates of 18 birds in each experimental unit. The treatments were composed by basal diets with increasing levels of wattle tannin (0, 250, 500, 750, 1000, 1250 g/ton-1 of wattle tannin). The data showed that the use of levels above 500 g / t of wattle tannin in the diet is detrimental to the performance of the birds, and there were no statistical differences in morphometric measures. Carcass yield decreased linearly with the addition of tannin in the diet and there was a decrease in fat deposition, and an increase in liver size. In the second trial, the performance of broilers from 21 to 42 days was evaluated. For that, 900 Cobb-500 21-days-old male broilers were housed in a completely randomized design, with increasing levels of substitution (0, 25, 50, 75, 100%) of the golden mussel flour in replacement of limestone and also with supplement or not of wattle tannin (250 g/ton-1 of wattle tannin) with 5 replicates per treatment and 18 birds in each experimental unit. The performance showed that the use of mussel can be performed up to 100% in replacement of the limestone in the feeding without affecting the variables, but the use of 250 g/ton-1 of wattle tannin was detrimental to the performance of broiler chickens cutting. For bony features, the use of tannin decreased bone strength (kgf) and increased phosphorus in natural matter, and there was an interaction between variables to Seedor index and gray on fresh matter. The use of tannin negatively affected carcass yield and the relative weight of kidneys, and there was a significant interaction for yield wings and legs. Calcium levels in the blood suffered interaction between the substitution levels studied
O desenvolvimento deste trabalho teve como objetivo avaliar a utilização de taninos como adsorvente de metais tóxicos em rações de pintos de corte alimentados com diferentes níveis de inclusão de farinha de mexilhão dourado em substituição ao calcário calcítico das rações. Foram realizados dois experimentos divididos em duas fases com dois ensaios cada, no primeiro experimento foi realizado um ensaio para avaliar o desempenho de pintos de corte para fase 1 a 21 dias, alimentados com tanino de acácia, utilizando-se 720 pintos de corte, machos, com um dia de idade, Cobb 500, distribuídos em um delineamento inteiramente casualizado, com seis tratamentos e seis repetições, com 20 aves em cada unidade experimental. Os tratamentos eram formados por rações basais com níveis crescentes de tanino de acácia (0, 250, 500, 750, 1000, 1250 g/ton-1 de tanino de acácia). Os resultados demostraram que a utilização de 250 g/ton-1 de tanino foi prejudicial para o desempenho, e as medidas morfométricas não sofreram diferença estatística utilizando tanino na dieta. Num segundo ensaio foi avaliado o desempenho de pintos de corte para a fase 1 a 21 dias de idade alimentados com níveis crescente (0; 25; 50; 75; 100%) de substituição de farinha de mexilhão dourado pelo calcário calcítico da ração e ainda a suplementação ou não de tanino de acácia (250 g/ton-1 de tanino de acácia), com 5 repetições por tratamento. Foram alojados em delineamento inteiramente casualizado, 1200 pintos de corte, machos, com um dia de idade, Cobb 500, com 24 aves por unidade experimental. Os resultados apontaram que o mexilhão dourado possui grande quantidade de cálcio, níveis baixíssimos de metais tóxicos, e a contaminação microbiológica não apresentou ou encontra-se abaixo dos valores permitidos pela legislação vigente. Para o desempenho, os dados demonstraram que a utilização do mexilhão dourado pode ser realizada em até 100% de substituição ao calcário calcítico das rações sem afetar as variáveis estudadas, porém a utilização de 250 g/ton-1 de tanino de acácia foi prejudicial para o desempenho dos pintos de corte. Não foi observado influencia na utilização de mexilhão dourado e tanino sobre a deposição de metais tóxicos no organismo das aves. As variáveis, fígado e rins, apresentaram interação entre as dietas avaliadas. As características osseas, apenas a cinza na matéria natural apresentou interação entre os fatores estudados. No segundo experimento, o primeiro ensaio teve como objetivo avaliar o desempenho de frangos de corte para a fase de 21 a 42 dias, alimentados com tanino de acácia. Aos 21 dias foram distribuídos em um delineamento inteiramente casualizado, com 648 frangos de corte, machos, Cobb 500 divididos em seis tratamentos e seis repetições, com 18 aves em cada unidade experimental. Os tratamentos eram formados por rações basais com níveis crescentes de tanino de acácia (0, 250, 500, 750, 1000, 1250 g/ton-1 de tanino de acácia). Os dados encontrados demostraram que a utilização com níveis acima de 500 g/ton-1 de tanino de acácia na dieta é prejudicial para o desempenho das aves, e não foram encontradas diferenças estatísticas para as medidas morfométricas. O rendimento de carcaça decresceu linearmente com a inclusão de tanino na dieta, e houve uma diminuição na deposição de gordura, e um aumento no tamanho do fígado. No segundo ensaio foi avaliado o desempenho de frangos de corte para a fase de 21 a 42 dias, alojados em um delineamento inteiramente casualizado, com níveis crescente de substituição (0; 25; 50; 75; 100%) de farinha de mexilhão dourado pelo calcário calcítico da ração e ainda a suplementação ou não de tanino de acácia (250 g/ton-1 de tanino de acácia), com 5 repetições por tratamento. Aos 21 dias as aves foram distribuídas em um delineamento inteiramente casualizado, 900 frangos de corte, machos, Cobb 500, com 18 aves em cada unidade experimental. O desempenho nesta fase demonstrou que a utilização do mexilhão dourado pode ser realizada em até 100% de substituição ao calcário calcítico das rações sem afetar as variáveis estudadas, porém a utilização de 250 g/ton-1 de tanino de acácia foi prejudicial para o desempenho dos frangos de corte. Para as características osseas, a utilização de tanino diminuiu a resistência óssea (kgf) e aumentou o fósforo na matéria natural, e houve interação entre as variáveis estudadas para o índice Seedor e cinza na matéria natural. A utilização de tanino afetou negativamente o rendimento de carcaça e o peso relativo dos rins, e houve interação significativa para o rendimento de asas e pernas. Os níveis de cálcio no sangue sofreram interação entre os níveis de substituição estudados
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Silva, Marco Rogerio Gomes da. "Quantificação de carbono sequestrado em sistema de cultivo da cana-de-açúcar em aleias." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/132.
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Previous issue date: 2012-06-28The present work aims to analyze the system of alleys, planting trees in rows associated with a commercial crop, in this case sugar cane, with three species of plants with timber characteristic, fertilize and fixative, making nutrient cycling, reducing the monoculture effects, with ecological and environmental gains. This technique will allow the increase of profits per hectare by fixing carbon during the growth period of these trees, besides the sale of wood production and promote the environmental sustainability of sugar cane. The physical parameters used to evaluate were monthly measurements during the first 2 years of experiment established, base diameter and the first branch plus the height of the stem of each plant, to thereby obtain the volume of each plant, to quantify the fixed carbon by non-destructive method. The results showed that the Guapuruvu capture media 685 g / plant of carbon, representing more 1.8 times than Cedar (381 g / plant) and 4.75 times more than Ipê (144 g / plant) in the same period. The Guapuruvu showed a yield higher than the Cedar and Ipe Yellow, both in tree growth and carbon fixation in evaluate period. The Arboreal species did not affect the development of the culture of sugar cane in the bands 30 and 45 meters of cultivation, only in 60 meters there was interference.
O presente trabalho tem como objetivo analisar o sistema de aleias, plantio de árvores em linhas associado a uma cultura agrícola, neste caso a canavieira, com três espécies de plantas de característica madeireiras, adubadeira e fixadora, realizando a ciclagem de nutrientes, diminuindo os efeitos da monocultura, apresentando ganhos ecológicos e ambientais. Essa técnica poderá possibilitar o aumento de renda por hectare, através da fixação de carbono ao longo do período de crescimento destas árvores, alem da venda da produção de madeiras, desde que averbada legalmente e promover a sustentabilidade ambiental da cultura canavieira. Os parâmetros físicos utilizados para avaliação foram as medidas mensais nos primeiros dois anos do experimento implantado, dos diâmetros de base e de primeiro galho mais a altura do fuste de cada árvore, para assim obter o volume de cada planta, para quantificar o carbono fixado através de método não destrutivo. Os resultados demonstraram que o guapuruvú apresentou uma captura média de 685 g/planta de carbono, representando 1,8 vez mais que o cedro (381 g/planta) e 4,75 vezes mais que o ipê (144 g/planta) no mesmo período. O guapuruvú também apresentou um rendimento superior em relação ao cedro e ipê amarelo, no crescimento das árvores neste período de avaliação. As espécies arbóreas não afetaram a produção da cultura da cana-de-açúcar nas faixas 30 e 45 m de cultivo, sendo que apenas em 60 m foi possível detectar interferência.
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Costa, Mariana de Campos da [UNESP]. "Compostos bioativos e atividade sequestrante de radicais livres de quatro cultivares do Coffea arabica L. em diferentes estádios de maturação dos frutos." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/126534.
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000840373.pdf: 335771 bytes, checksum: eeaa819ad91635f0cfb4b02c2f229eee (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Entre as bebibas mais consumidas no Brasil destaca-se o café, um grão pertencente à família Rubiaceae, gênero Coffea. O Brasil produziu em 2014, 45,3milhões de sacas de café. As exportações brasileiras chegaram a aproximadamente 33,36 milhões de sacas, com o faturamento de US 5,98 bilhões. Vários fatores podem influenciar na qualidade da bebida, como a variedade, condições de cultivo, maturação dos frutos, fatores pré e pós-colheita, secagem, torração dos grãos entre outras, Além disso, o café apresenta na sua composição compostos bioativos como ácidos fenólicos, cafeína e trigonelina, que podem auxiliar na prevenção de algumas doenças. O objetivo deste estudo foi quantificar os teores de fenólicos e flavonóides totais, a atividade antioxidante, cafeína e composição de ácidos fenólicos de quatro cultivares de Coffea arabica (Acaiá, Obatã, Catuaí Amarelo, Catuaí Vermelho) durante os estádios de maturação dos frutos (verde, verde-cana, cereja e passa) e do cereja descascado. A atividade antioxidante foi medida pelo método de redução dos radicais DPPH e ABTS; os fenólicos totais pelo método de Folin-Ciocalteu; e os flavonóides totais pela reação colorimétrica com cloreto de alumínio. Os ácidos fenólicos (ácido clorogênico, ácido ferúlico e trigonelina) foram separados e quantificados por HPLC com detector por arranjo de diodos e em coluna de C18. Os cultivares Catuaí Amarelo e Catuaí Vermelho apresentaram os maiores teores de compostos fenólicos totais e flavonoides totais. Os cultivares Acaiá e Obatã apresentaram maior teor de cafeína. Em relação ao ácido clorogênico, maiores concentrações foram observadas nos cultivares Acaiá e Catuaí Vermelho e maior teor de ácifo ferrúlico no cultivar Catuaí Amarelo. Maior atividade antioxidante foi encontrada no cultivar Acaiá e menor, no Obatã. Com a maturação dos frutos há uma diminuição na concentração de cafeína. Maior...
Among the most consumed bebibas in Brazil stands out for coffee, a grain belonging to the Rubiaceae family, genus Coffea. Brazil produced in 2014, 45,3milhões bags of coffee. Brazilian exports reached approximately 33.36 million bags, with the US 5.98 billion revenue. Several factors may influence the quality of the beverage, as the variety, growing conditions, ripening of fruits, factors pre and post-harvest, drying, roasting of the beans among others, also the coffee has in its bioactive composition as phenolic acids, caffeine and trigonelline, which may help prevent some diseases. The objective of this study was to quantify the phenolic content and total flavonoids, antioxidant activity, caffeine and phenolic acids composition of four cultivars of Coffea arabica (Acaiá, Obatã, Catuaí Yellow Catuaí Red) during fruit maturation stages (green, green-cane, cherry and passes) and pulped. Antioxidant activity was measured by the reduction method of DPPH and ABTS radicals; total phenolics by the Folin-Ciocalteu method; and the total flavonoids by colorimetric reaction with aluminum chloride. Phenolic acids (chlorogenic acid, trigonelline and ferulic acid) were separated and quantified by HPLC with diode array detector and a C18 column. The cultivars Catuaí Yellow and Catuaí Red showed the highest levels of total phenolic compounds and total flavonoids. The Acaiá and Obatã cultivars had higher caffeine content. Regarding the chlorogenic acid, higher concentrations were observed in Acaiá and Catuaí Red cultivars and most ácifo ferulic content in Catuaí Yellow. Higher antioxidant activity was found in Acaiá and lower in Obatã. With the ripening of fruits there is a decrease in caffeine concentration. Highest antioxidant activity of coffee fruit is due to the content of chlorogenic acid.
Books on the topic "Sequestrant"
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Vallone, Giuseppe. Assalto al malpaese: Aria impura e chierici sequestrati in un borgo cilentano del Settecento. Torre Orsaia (Salento): Università popolare del Cilento, 2002.
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Wales, England and. All the severall ordinances and orders made by the Lords and Commons assembled in Parliament: Concerning sequestring the estates of delinquents, papists, spyes, and intelligencers : together with instructions for such persons as are employed in sequestring of such deliquents [sic] estates. London: Printed for Lawrence Blaiklock ..., 1985.
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Wales, England and. A declaration and ordinance of the Lords and Commons assembled in Parliament: For the better preventing of spyes and intelligencers, and for sequestring the estates of such as shall go from London to Oxford, or to the person of the king, queen, or any of the lords of the councell, or into any of the quarters of the army raised by the king, without order from one or both houses of Parliament : and likewise a reward of one fifth part of the estate of all such offenders, to be given to such persons as shall give notice thereof according to this ordinance. [London?]: Printed for Edward Husbands, 1986.
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Lebel, Teresa. The sequestrate relatives of Russula in Australia and New Zealand. 1998.
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Török, M. Estée, Fiona J. Cooke, and Ed Moran. Bone and joint infections. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199671328.003.0022.
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This chapter provides an overview of inflammations of the joint space and bones, such as arthritis and bursitis, including osteomyelitis and bone destruction and formation of sequestra. The chapter also includes prosthetic joint infections such as hip and knee replacements. It also describes diabetic foot infections, defined as any inframalleolar infection in a patient with diabetes mellitus. Infections include paronychia, cellulitis, myositis, abscesses, necrotizing fasciitis, septic arthritis, tendonitis, and osteomyelitis.
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Antonella, Romualdi, and Centro di iniziativa per le arti visive., eds. Il Patrimonio disperso: Reperti archeologici sequestrati dalla Guardia di finanza : Piombino, 15 luglio-31 ottobre 1989, Centro di iniziativa per le arti visive. Roma: "L'Erma" di Bretschneider, 1989.
Find full textBook chapters on the topic "Sequestrant"
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Gooch, Jan W. "Sequestrant." In Encyclopedic Dictionary of Polymers, 654. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10470.
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Cassidy, Marie M., and Don W. Watkins. "Dietary Fiber or Bile-Sequestrant Ingestion and Divalent Cation Metabolism." In Advances in Experimental Medicine and Biology, 193–207. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-9111-1_14.
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Toth, Peter P., Dragana Nikolic, Manfredi Rizz, Jacek Rysz, and Maciej Banach. "Use of Combination Statin and Bile Acid Sequestrant Therapy to Treat Dyslipidemia." In Combination Therapy In Dyslipidemia, 1–10. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20433-8_1.
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Moriartey, Stephanie. "Sequestrants." In Food Additives Data Book, 861–914. Oxford, UK: Wiley-Blackwell, 2011. http://dx.doi.org/10.1002/9781444397741.ch12.
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Dhal, Pradeep K., Chad C. Huval, and S. Randall Holmes-Farley. "Polymeric Sequestrants as Nonabsorbed Human Therapeutics." In Drug Discovery and Development, 383–404. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2006. http://dx.doi.org/10.1002/0471780103.ch15.
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Grundy, S. M. "Bile Acid Sequestrants: Do They Have a Future?" In Drugs Affecting Lipid Metabolism, 34–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-71702-4_6.
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Ganda, Om P., and Abhimanyu Garg. "Bile Acid Sequestrants: Risk–Benefits and Role in Treating Dyslipidemias." In Dyslipidemias, 453–63. Totowa, NJ: Humana Press, 2015. http://dx.doi.org/10.1007/978-1-60761-424-1_27.
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Sirtori, Cesare R. "Effects of Lipid Lowering Diets and of Bile Acid Sequestrants on Plasma Lipoproteins and Biliary Metabolism." In Liver, Nutrition, and Bile Acids, 101–12. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4615-9427-7_8.
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Levy, Robert I., and Conrad Blum. "What are the Comparative Risks versus Benefits for Bile Acid Sequestrants, HMG Co-A Reductase Inhibitors, Nicotinic Acid, Probucol, and Fibric Acid Derivatives?" In Risk/Benefit Analysis for the Use and Approval of Thrombolytic, Antiarrhythmic, and Hypolipidemic Agents, 215–23. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4613-1605-3_13.
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"Sequestrant." In Encyclopedia of Lubricants and Lubrication, 1720. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-22647-2_200416.
Full textConference papers on the topic "Sequestrant"
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Ukrainczyk, Neven, Eduardus A. B. Koenders, and Klaas van Breugel. "Cementitious Sealing Material: 3D Digital Image Based Characterization of Pore Size Distribution and Modeling of Transport Properties." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10954.
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Exhausted oil and gas reservoirs are one of the most potential storage facilities to sequestrate the worlds CO2. These reservoirs are sealed with cementitious materials, that should have a long time performance. Therefore, this paper emphasizes the characterization of the evolving capillary pore network and transport properties of the cementitious microstructure used to seal the wellbore. The Hymostruc numerical model is employed to simulate the development of an evolving virtual microstructure of cementitious materials. The simulated 3D microstructures were then digitized to form a matrix of cubic voxels. The pore-size distributions of the obtained virtual microstructures were calculated using a combination of three-dimensional digital image processing algorithms: 1) distance transform and 2) medial axis thinning algorithm to obtain a 3D skeleton of the pore structure. Transport properties of the simulated microstructures are analyzed employing a finite difference 3D transport model. The modeling results are compared with available literature results.
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Inui, Masayuki, and Toru Sato. "Experimental Feasibility Study on CO2 Sequestration in the Form of Hydrate Under Seafloor." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92306.
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A new concept for CO2 geological sequestration is proposed here as one of promising countermeasures against the global warming. For general geological sequestration technologies, there are still some issues we need to tackle, such as the expansion of amount of sequestrated CO2, reduction of environmental risks caused by CO2 leakage, and cost saving. In order to solve these problems, we propose CO2 sequestration system to sequestrate a large amount of CO2 in the form of gas hydrate under the seafloor safely. In this system, we inject CO2 + N2 mixed gas recovered from flue gas of a coal-thermal power plant into marine sediments at high pressure and low temperature, where CO2 forms clathrate hydrate. Besides, by using CO2 + N2 mixed gas, we can reduce the cost for its sequestration and avoid blockage in marine sediments at the same time. In this work, we assessed the potential amount of sequestrated CO2 and the cost of this system. From the results, the amount of CO2 that can be sequestrated offshore Japan by this system was estimated to be twice and the sequestration cost can be reduced by 14.3%, compared with those of the CO2 aquifer storage.
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Wang, Baoqun, Hongguang Jin, Wei Han, and Danxing Zheng. "IGCC System With Integration of CO2 Recovery and the Cryogenic Energy in Air Separation Unit." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53723.
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In this paper, we proposed a new type of IGCC system with CO2 recovery, which employed the cryogenic energy of the air separation unit. The idea of integration of CO2 separation is introduced and the theoretical separation work was compared between the integration CO2 separation process and the traditional CO2 separation process. Different from the two-step (separation and compression) CO2 recovery processes commonly used, the new system can separate and liquefy CO2 simultaneously by means of integration of the cryogenic energy of air separation unit and CO2 recovery unit. In this way, a large amount of compression work can be reduced, compared with wet scrubbing processes to sequestrate the recovered CO2. The new integration system was compared with the amine absorption process. The result indicated that through energy integration between air separation and CO2 recovery, the energy consumption of CO2 separation is expected to be reduced by 28.4%, compared to the traditional amine absorption process. Based on the investigation, the paper make a contribution to provide a concept of integration of cold energy with CO2 separation for the purpose of increase in efficiency and mitigation of greenhouse gas impact.
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Visoná, Lucas da Silva, Bianca De Arruda Leite, Filipe Oliveira Granero, Mônica Rosa Bertão, and Regildo Márcio Gonçalves Da Silva. "OBTENÇÃO DE EXPLANTES DE SEMENTES E PLÂNTULAS DE GLYCINE MAX COM COMPOSTOS BIOATIVOS E AVALIAÇÃO DO POTENCIAL ANTIOXIDANTE." In I Congresso de Engenharia de Biotecnologia. Revista Multidisciplinar de Educação e Meio Ambiente, 2021. http://dx.doi.org/10.51189/rema/1349.
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A soja do gênero Glycine representa uma das mais importantes culturas vegetais na economia mundial, esse vegetal é considerado um alimento funcional com vários benefícios a saúde, as substâncias fenólicas encontradas na soja possuem potencial antioxidante essas substâncias evitam a deterioração oxidativa dos alimentos e podem ser utilizadas para minimizar os danos oxidativos do organismo animal. O presente trabalho teve por objetivo desenvolver um método de obtenção de explantes de sementes e plântulas de Glycine max rico em compostos bioativos e avaliar seu potencial antioxidante. Para a obtenção dos explantes, foi realizada a limpeza das sementes e embebição em água ultrapura autoclavada, de uma parte das sementes foram retirados o embrião e o cotilédone sem germinação e o restante foram colocadas para germinar em estufa BOD para o desenvolvimento das plântulas de soja em seguida foi realizado a extração das diferentes partes das plântulas, o material vegetal obtido foi macerado e extraído em uma solução hidroetanólica (30:70), seguido por rotoevaporação e liofilização para obtenção do extrato seco. Após a obtenção dos extratos das diferentes partes vegetais foi avaliado a atividade antioxidante pela captura do radical livre DPPH e atividade antioxidante pela redução do íon ferro (FRAP). No teste DPPH foi observado que todos os seguimentos vegetais apresentaram poder sequestrante do radical DPPH, com destaque para a radícula na concentração de 20 mg/mL (51,61%), semelhantemente o teste FRAP todos os explantes apresentaram atividade redutora do íon ferro, com destaque para o cotilédone com germinação que apresentou melhor atividade na concentração de 20 mg/mL (1153,97 µM Equivalente Trolox/g de extrato seco). De acordo com estes resultados, pode-se concluir que as diferentes partes vegetais da sementes e das plântulas de soja possuem compostos antioxidantes que podem ser utilizados em novos estudos de cultura celular.
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Bothien, Mirko R., Andrea Ciani, John P. Wood, and Gerhard Fruechtel. "Sequential Combustion in Gas Turbines: The Key Technology for Burning High Hydrogen Contents With Low Emissions." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90798.
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Abstract Excess energy generation from renewables can be conveniently stored as hydrogen for later use as a gas turbine fuel. Also, the strategy to sequestrate CO2 from natural gas will require gas turbines to run with hydrogen-based fuels. In such scenarios, high temperature low emission combustion of hydrogen is a key requirement for the future gas turbine market. Ansaldo Energia’s gas turbines featuring sequential combustion have an intrinsic advantage when it comes to fuel flexibility and in particular hydrogen-based fuels. The sequential combustion system is composed of two complementary combustion stages in series: one premix stage followed by an auto-ignited second stage overcoming the limits of traditional premix combustion systems through a highly effective extra tuning parameter, i.e. the temperature between the first and the second stage. The standard Constant Pressure Sequential Combustion (CPSC) system as applied in the GT36 engine is tested, at high pressure, demonstrating that a modified operation concept allows stable combustion with no changes in combustor hardware for the whole range of natural gas and hydrogen blends. It is shown that in the range from 0% to 70% (vol.) hydrogen, stable combustion is achieved at full nominal exit temperature, i.e. without any derating and thus clearly outperforming other available conventional premixed combustors. Operation between 70% and 100% is possible as well and only requires a mild reduction of the combustor exit temperature. By proving the transferability of the single-can high pressure results to the engine, this paper demonstrates the practicality of operating the Ansaldo Energia GT36 H-Class gas turbine on fuels containing unprecedented concentrations of hydrogen while maintaining excellent performance and low emissions both in terms of NOx and CO2.
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Chai, Rukaun, Yuetian Liu, Qianjun Liu, Xuan He, and Pingtian Fan. "Effect and Mechanism of CO2 Electrochemical Reduction for CCUS-EOR." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206135-ms.
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Abstract Unconventional reservoir plays an increasingly important role in the world energy system, but its recovery is always quite low. Therefore, the economic and effective enhanced oil recovery (EOR) technology is urgently required. Moreover, with the aggravation of greenhouse effect, carbon neutrality has become the human consensus. How to sequestrate CO2 more economically and effectively has aroused wide concerns. Carbon Capture, Utilization and Storage (CCUS)-EOR is a win-win technology, which can not only enhance oil recovery but also increase CO2 sequestration efficiency. However, current CCUS-EOR technologies usually face serious gas channeling which finally result in the poor performance on both EOR and CCUS. This study introduced CO2 electrochemical conversion into CCUS-EOR, which successively combines CO2 electrochemical reduction and crude oil electrocatalytic cracking both achieves EOR and CCUS. In this study, multiscale experiments were conducted to study the effect and mechanism of CO2 electrochemical reduction for CCUS-EOR. Firstly, the catalyst and catalytic electrode were synthetized and then were characterized by using scanning electron microscope (SEM) & energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Then, electrolysis experiment & liquid-state nuclear magnetic resonance (1H NMR) experiments were implemented to study the mechanism of CO2 electrochemical reduction. And electrolysis experiment & gas chromatography (GC) & viscosity & density experiments were used to investigate the mechanism of crude oil electrocatalytic cracking. Finally, contact angle and coreflooding experiments were respectively conducted to study the effect of the proposed technology on wettability and CCUS-EOR. SEM & EDS & XPS results confirmed that the high pure SnO2 nanoparticles with the hierarchical, porous structure, and the large surface area were synthetized. Electrolysis & 1H NMR experiment showed that CO2 has converted into formate with the catalysis of SnO2 nanoparticles. Electrolysis & GC & Density & Viscosity experiments indicated that the crude oil was electrocatalytically cracked into the light components (<C20) from the heavy components (C21∼C37). As voltage increases from 2.0V to 7.0V, the intensity of CO2 electrocchemical reduction and crude oil electrocatalytic cracking enhances to maximum at 3.5V (i.e., formate concentration reaches 6.45mmol/L and carbon peak decreases from C17 to C15) and then weakens. Contact angle results indicated that CO2 electrochemical reduction and crude oil electocatalytic cracking work jointly to promote wettability alteration. Thereof, CO2 electrochemical reduction effect is dominant. Coreflooding results indicated that CO2 electrochemical reduction technology has great potential on EOR and CCUS. With the SnO2 catalytic electrode at optimal voltage (3.5V), the additional recovery reaches 9.2% and CO2 sequestration efficiency is as high as 72.07%. This paper introduced CO2 electrochemical conversion into CCUS-EOR, which successfully combines CO2 electrochemical reduction and crude oil electrocatalytic cracking into one technology. It shows great potential on CCUS-EOR and more studies are required to reveal its in-depth mechanisms.