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Готові списки джерел за темами / UV-VIS detector

Добірка наукової літератури з теми "UV-VIS detector"

Автор: Grafiati

Опубліковано: 13 вересня 2021

Оновлено: 13 лютого 2022

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Статті в журналах з теми "UV-VIS detector":

1

Kammer, Frank v. d., and Ulrich Förstner. "Natural colloid characterization using flow-field-flow-fractionation followed by multi-detector analysis." Water Science and Technology 37, no. 6-7 (March 1, 1998): 173–80. http://dx.doi.org/10.2166/wst.1998.0750.

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A design for a flow-field-flow-fractionation with UV/VIS-, fluorescence- and laser-light-scattering-detectors is presented and tested with extracts from a humus rich horizon of a gleyic podzol. It is tested to show how the system can retrieve relevant information about changes in the constitution of the colloid samples. The main objective is the investigation of colloid alteration during processes provoked by main geochemical driving forces (e.g. pH or ionic strength), in this case changes of redox potential. Therefore fluorescence- and UV/VIS-fractograms are taken at different wavelengths and compared. Particle diameters of natural colloids are calculated from laser-light-scattering data and compared with reference standards.

2

Studziński, Waldemar, and Alicja Gackowska. "Removal of 2-phenylbenzimidazole-5-sulfonic acid using heterogeneous photocatalysis." Acta Innovations, no. 28 (July 1, 2018): 5–13. http://dx.doi.org/10.32933/actainnovations.28.1.

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UV filters are classified as environmental pollutants (emerging pollutants). One of the most frequently detected UV filters in real samples is 2-phenylbenzimidazole-5-sulfonic acid (PBSA). It has been shown that conventional technologies applied in sewage treatment plants are not adapted for complete removal of sunscreen agents. Therefore, there is a trend to undertake activities leading to improvement of water quality by enhancing treatment methods. This is important due to the fact that in an aqueous environment, in the presence of UV radiation or sunlight irradation, PBSA generates reactive oxygen species that can damage the DNA of living organisms. The aim of study was to investigate an effect of pH and TiO2 on PBSA stability in the presence of UV radiation. It was found that the rate of PBSA degradation depends on the catalyst dose and pH of solution. The photocatalysis reaction was carried out in a Heraeus laboratory exposure set equipped with a 150 W mediumpressure mercury lamp. The course of PBSA degradation process as a function of time was monitored using UV/VIS spectrophotometer and liquid chromatograph equipped with UV-Vis detector.

3

MOSAYEBI, PEGAH, DAVOUD DORRANIAN, and KASRA BEHZAD. "INVESTIGATING THE IMPLEMENTATION OF ZnO NANOPARTICLES AS A TUNABLE UV DETECTOR FOR DIFFERENT SKIN TYPES." Surface Review and Letters 25, no. 02 (February 2018): 1850062. http://dx.doi.org/10.1142/s0218625x18500622.

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A facile chemical reduction method was used to synthesize ZnO nanoparticles (NPs) in ethylene glycol solvent at two different calcination temperatures. As a result of variation in the calcination temperature, ZnO NPs with two different sizes were achieved. The NPs were investigated for their structural and optical characteristics using X-ray diffraction and ultraviolet (UV)–Vis spectroscopy. The synthesized ZnO NPs exhibited a hexagonal structure with sizes of 46 and 65[Formula: see text]nm. The synthesized NPs were then used to investigate dye photocatalytic behavior of products as a tunable UV detector for different skin types. The dye degradation and decolorization of methylene blue in the presence of ZnO NP, following UV radiation as a function of time, were studied at different pH levels. The optical absorption spectra were then taken every 15[Formula: see text]min for all samples. The UV–Vis spectroscopy spectra revealed that optical absorption of solution was decreased upon UV exposure as a function of time. Photocatalytic reaction indicated that the dye degradation and decolorization rate were accelerated with the increase of pH level. Therefore, a tunable UV detector for different skin types could be engineered by varying the pH level of solution to avoid human skin burning.

4

Alister G., Willis, and Saharudin Haron. "Synthesis of composite thin-film polymer consisting of tungsten and zinc oxide as hydrogen gas detector." E3S Web of Conferences 90 (2019): 01008. http://dx.doi.org/10.1051/e3sconf/20199001008.

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A composite polymer consisting of polyaniline (PANI) was synthesised via oxidative polymerisation by varying concentrations of transitional metal oxides and the presence of a hydrogen dissociation catalyst, palladium (Pd). The metal oxides chosen for this study were tungsten oxide (WO3) and zinc oxide (ZnO). The composite polymer samples were characterised using Fourier transform infrared (FTIR) spectroscopy where ultraviolet-visible (UV-Vis) spectroscopy was used to observe the optical changes of the thin films due to exposure to hydrogen. The FTIR spectra obtained confirmed the synthesis of PANI composite. Based on the UV-VIS analysis, PANI-ZnO composite polymer showed the highest difference in peak intensity before and after exposure to hydrogen with 11.4% difference.

5

Jooybari, Banin Shakeri, Hossein Afarideh, Mohammad Lamehi Rachti, and Mitra Ghergherehchi. "Modification on chemical and optical properties of PADC polymer by ArF laser (193 nm) irradiation." Journal of Polymer Engineering 35, no. 4 (May 1, 2015): 359–65. http://dx.doi.org/10.1515/polyeng-2014-0149.

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Abstract Poly allyl diglycol carbonate (PADC) has been irradiated by ArF(UV)-laser light (wavelength 193 nm) at different fluences and pulse numbers in order to investigate the photo degradation of chemical molecular structure. The photo-induced chemical reactions and photo-degradation mechanism at the irradiated polymer surface have been clarified by ultraviolet-visible (UV-Vis) spectrum and FTIR spectrum analyses. Optical and surface modifications of irradiated samples have been studied by refractive index and water contact angle measurements. Using the UV-Vis spectra, Urbach’s energy (Eu), indirect and direct band gaps energy (Eg) of unirradiated and UV-laser irradiated samples were determined. The UV-Vis and FTIR spectra analysis show that photo degradation and photo oxidation of polymer caused free-radical generation. In the presence of air, free-radical generation induced by UV-laser light followed by bond scission and cross-linking process will finally produce new products. New product generation can be affected on chemical and optical properties of irradiated samples. The irradiated PADC at various fluences in the range of medium to high demonstrate improvement of refractive index, and this is highly important in plastic lens technology. The obtained results reveal that chemical modification could affect track parameters when PADC is used as a nuclear track detector.

6

Singh, Surinder, and Sangeeta Prasher. "UV–VIS spectroscopic and etching studies of IR exposed CR-39 plastic track detector." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 215, no. 1-2 (January 2004): 169–73. http://dx.doi.org/10.1016/s0168-583x(03)01815-9.

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7

Mellouki, I., O. Touayar, T. Ktari, J. Bastie, and N. Yacoubi. "A method for calibrating of a trap pyroelectric detector in the UV–vis domain." Sensors and Actuators A: Physical 120, no. 2 (May 2005): 437–40. http://dx.doi.org/10.1016/j.sna.2005.01.018.

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8

Strauss, Holger M., Engin Karabudak, Saroj Bhattacharyya, Andreas Kretzschmar, Wendel Wohlleben, and Helmut Cölfen. "Performance of a fast fiber based UV/Vis multiwavelength detector for the analytical ultracentrifuge." Colloid and Polymer Science 286, no. 2 (December 19, 2007): 121–28. http://dx.doi.org/10.1007/s00396-007-1815-5.

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9

Gebregziabher, Berhane Sibhatu, Shengrui Zhang, Jie Qi, Muhammad Azam, Suprio Ghosh, Yue Feng, Yuanyuan Huai, Jing Li, Bin Li, and Junming Sun. "Simultaneous Determination of Carotenoids and Chlorophylls by the HPLC-UV-VIS Method in Soybean Seeds." Agronomy 11, no. 4 (April 13, 2021): 758. http://dx.doi.org/10.3390/agronomy11040758.

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Soybean contains nutritional bioactive compounds, including carotenoids associated with human health benefits. Carotenoids are applicable in pharmaceuticals/nutreceuticals, cosmetic, and mainly food industries. However, an efficient and accurate method for carotenoid and chlorophyll detection and quantification has not yet been developed and validated for soybean seeds. The need for a rapid and reliable analysis method has become increasingly important. Thus, this study was initiated to develop and validate a simple, rapid, and selective reversed-phase high-performance liquid chromatographic (RP-HPLC) method for the simultaneous determination of lutein, zeaxanthin, α-carotene, β–carotene, β–cryptoxanthin, and chlorophyll–a and –b in soybean flour sample (100.00 mg) extracted using ethanol-acetone (1:1) solvents at a volume of 1.50 mL. Interestingly, the effective separation technique was achieved using the mobile phases of methyl tert-butyl ether, methanol containing 10 mM ammonium acetate, and water delivered at a 0.90 mL min−1 flow rate through a C30YMC Carotenoid (250 × 4.6 mm I.D., S-5 µm) column coupled with a UV-VIS detector set at 450 nm. The detector response was linear from 0.05–30.00 μg mL−1 with a coefficient of determination (R2) of 0.9993–0.9999. The validated method was sensitive with a detection limit (LOD) of 0.0051–0.0300 μg mL−1 and 0.0155–0.0909 μg mL−1 for the quantification limit (LOQ). The recovery values were from 83.12–106.58%, and the repeatability precision ranged from 1.25–4.20% and 0.15–0.81% for the method and system, respectively. The method showed adequate precision with a relative standard deviation smaller than 3.00%. This method was also found to be applicable for profiling carotenoids and chlorophylls in other legumes. In summary, this method was successfully implemented for qualitative and quantitative determination of major carotenoids and chlorophylls in soybean and other legume seeds, which are beneficial to food industry and quality breeding programs to meet human nutrition demands globally.

10

Journal, Baghdad Science. "Determination of Water-Soluble Vitamins in Iraqi Honey Bee and Compare with Others Types by High –Performance Liquid Chromatography." Baghdad Science Journal 13, no. 2 (June 5, 2016): 447–57. http://dx.doi.org/10.21123/bsj.13.2.447-457.

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High-performance liquid chromatographic methods are used for the determination of water-soluble vitamins with UV-Vis. Detector. A reversed-phase high-performance liquid chromatographic has been developed for determination of water-soluble vitamins. Identification of compounds was achieved by comparing their retention times and UV spectra with those of standards solution. Separation was performed on a C18 column, using an isocratic 30% (v/v) acetonitril in dionozed water as mobile phase at pH 3.5 and flow rate 1.0m/min. The method provides low detection and quantification limits, good linearity in a large concentration interval and good precision. The detection limits ranged from 0.01 to 0.025µg/ml. The accuracy of the method was tested by measuring average recovery values ranged between 94% - 101 %. For standerd solution, and 93%-99% of honey bee samples.

Більше джерел

Дисертації з теми "UV-VIS detector":

1

Bhattacharryya, Saroj Kumar. "Development of detector for analytical ultracentrifuge. - [korr. Fassung]." Phd thesis, Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2006/821/.

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In this work approaches for new detection system development for an Analytical Ultracentrifuge (AUC) were explored. Unlike its counterpart in chromatography fractionation techniques, the use of a Multidetection system for AUC has not yet been implemented to full extent despite its potential benefit. In this study we tried to couple existing fundamental spectroscopic and scattering techniques that are used in day to day science as tool for extracting analyte information. Trials were performed for adapting Raman, Light scattering and UV/Vis (with possibility to work with the whole range of wavelengths) to AUC. Conclusions were drawn for Raman and Light scattering to be a possible detection system for AUC, while the development for a fast fiber optics based multiwavelength detector was completed. The multiwavelength detector demonstrated the capability of data generation matching the literature and reference measurement data and faster data collection than that of the commercial instrument.

It became obvious that with the generation of data in 3-D space in the UV/Vis detection system, the user can select the wavelength for the evaluation of experimental results as the data set contains the whole range of information from UV/Vis wavelength. The detector showed the data generation with much faster speed unlike the commercial instruments. The advantage of fast data generation was exemplified with the evaluation of data for a mixture of three colloids. These data were in conformity with measurement results from normal radial experiments and without significant diffusion broadening. Thus conclusions were drawn that with our designed Multiwavelength detector, meaningful data in 3-D space can be collected with much faster speed of data generation.
In der vorliegenden Arbeit wurde die Entwicklung neuer Detektoren für die Analytische Ultrazentrifugation (AUZ) untersucht und vorangetrieben. Im Gegensatz zu chromatgraphischen. Fraktionierungsmethoden werden Multidetektionssysteme bis heute nicht in der AUZ eingesetzt. Hier wird die Möglichkeit geprüft, bekannte spektroskopische sowie Streumethoden simultan zur Probenanalyse in der AUZ einzusetzen mit dem Ziel, simultan komplimentäre Informationen über die Probe zu erhalten. So wurde versucht, Raman- und UV/VIS-Spektroskopie (letztere mit der Möglichkeit, das gesamte Wellenlängenspektrum auszunutzen) und statische Lichtstreuung zu kombinieren, um das Analytverhalten während des Ultrazentrifugationsexperimentes zu untersuchen. Es wurden zum einen die Ramanspektroskopie als Detektionssystem für chemische Funktionalität in der AUZ geprüft und zum anderen gezeigt, daß die statische Kleinwinkel Lichtstreuung als direkter Molmassendetektor für den Einsatz in der AUZ geeignet erscheint. Zum anderen wurde die Entwicklung eines Multi-Wellenlängen-UV/VIS-Detektors abgeschlossen, um seine Eignung für den Einsatz in der AUZ und die damit verbundene Möglichkeiten der schnelleren und umfassenderen Datenerzeugung gegenüber kommerziellen Geräten zu zeigen. Dieser Multiwellendetektor liefert anstelle eines Absorptionswertes für jede radiale Position in der Messzelle direkt ein ganzes UV-Vis Spektrum und erzeugt eine zusaetzliche Dimension der Messdaten, was die Möglichkeiten der Analyse von komplexen Systemen mit multiplen Chromophoren, Teilchengrößenbestimmung über Wellenlängenabhängigkeit der Trübung oder auch der Datenmittelung enorm vergrößert. Desweiteren erlaubt der Detektor die Anwendung von Geschwindigkeitsprofilen zur Analyse extrem polydisperser Systeme. Die Entwicklung des Detektors beruht auf einem auf Linsen basierenden System mit modularem Aufbau. Dabei war die sorgfältige Ausrichtung des optischen Systems ein essentieller Punkt, um seine Eignung zu überprüfen zu können. An einer Mischung von drei Kolloiden, Halbleiternanopartikeln sowie Proteinen und deren Mischungen ist es hier gelungen, die erfolgreiche Entwicklung des UV/VIS-Detektors zu demonstrieren: Die Daten konnten schneller und mit wesentlich mehr Informationsgehalt, als auf allen kommerziellen Geräten generiert werden. Die Sedimentationskoeffizientenverteilungen stimmen dabei mit denen aus herkömmlichen Sedimentationsgeschwindigkeitsexperimenten überein, unterliegen jedoch nicht einer signifikanten diffusionsbedingten Verbreiterung. Es ist in dieser Arbeit somit gelungen, zum einen die Lichtstreuung als aussichtsreiche Methode für ein Detektorsystem in der AUZ aufzuzeigen, und zum anderen einen Multi-Wellenlängen-UV/VIS-Detektor zu entwickeln, der eine Datenerzeugung von bislang noch nicht erreichter Schnelligkeit im dreidimensionalen Raum ermöglicht.

2

Ishikawa, Aline Akemi. "Desenvolvimento e validação de método para análise do topiramato em amostras de plasma por eletroforese capilar com detecção UV/vis e C4D." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/60/60134/tde-06072016-104515/.

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O topiramato (TPM) é um fármaco antiepiléptico utilizado para o controle de crises epilépticas generalizadas e parciais em adultos e crianças. A determinação da concentração plasmática do TPM em associação com as observações clínicas é de suma importância, uma vez que permite o ajuste individual da dose administrada ao paciente, diminuindo a incidência de reações adversas e melhorando a adesão ao tratamento. No presente trabalho, dois métodos bioanalíticos foram desenvolvidos e validados para análise do TPM em amostras de plasma, por eletroforese capilar utilizando os detectores DAD (detecção indireta) e C4D Lite (detecção condutométrica). A análise eletroforética para ambos os métodos foi realizada em um capilar de sílica fundida de 75 ?m de diâmetro interno e 40 cm de comprimento efetivo. O eletrólito de corrida foi composto por trietanolamina (TEA) 15 mmol L-1 para a detecção condutométrica e TEA 15 mmol L-1, ácido 3,5 dinitrobenzóico (DNB) 5 mmol L-1 e brometo de cetiltrimetilamônio (CTAB) 0,4 mmol L-1 para detecção indireta. As injeções foram feitas no modo hidrodinâmico a 0,8 psi por 5 segundos e a tensão aplicada foi de -20 e 20 kV para detecção indireta e condutométrica, respectivamente. Nestas condições, o TPM migrou em 2,5 min. O preparo das amostras foi realizado por extração líquido-líquido (LLE), usando éter metil-terc-butílico (MTBE) como solvente extrator e utilizando 500 e 200 ?L de plasma para o método com detecção indireta e condutométrica, respectivamente. Os métodos foram validados de acordo com os guias oficiais da Agência Nacional de Vigilância Sanitária e European Medicine Agency e apresentaram linearidade no intervalo de concentração plasmática de 1-30 ?g mL-1 e valores de precisão e exatidão abaixo de 15 %, além de serem seletivos. Assim, ambos os métodos foram aplicados com sucesso em amostras de plasma de pacientes em tratamento com o TPM. Embora os detectores universais geralmente apresentem um maior limite de detecção comparado com detectores seletivos, o método com detecção condutométrica desenvolvido neste trabalho apresentou como vantagem maior sensibilidade em relação método indireto (DAD). Além disso, apresentou também vantagens como simplicidade e baixo custo, mostrando viabilidade na aplicação para análises de rotina.
Topiramate (TPM) is an antiepileptic drug that has been used as an agent for the control of partial and generalized seizures in both adults and children patients. The determination of the plasmatic concentration of TPM in association with clinical observations is of utmost importance for the individual adjustment of the administered dose to the patient. In the present work, two bioanalytical methods have been developed and validated for TPM analysis in plasma samples by capillary electrophoresis using DAD (indirect detection) and C4D Lite detectors (conductometric detection). The electrophoretic analysis for both methods were performed on a fused silica capillary of 75 ?m of internal diameter and 40 cm effective length. The background electrolyte was composed of triethanolamine (TEA) 15 mmol L-1 for conductometric detection and TEA 15 mmol L-1, 3,5 dinitrobenzoic acid (DNB) 5 mmol L-1 and cetyltrimethylammonium bromide (CTAB) 0.4 mmol -1 for indirect detection. The injections were carried out in hydrodynamic mode, at 0.8 psi for 5 seconds, and the voltage applied were -20 e 20 kV for indirect and conductometric detection, respectively. Under these conditions, TPM migrated in 2.5 min. The sample preparation was carried out by liquid liquid extraction (LLE) using methyl tert-butyl ether (MTBE) as solvent, and using 500 and 200 ?L of plasma samples for direct and conductometric detection, respectively. The methods were validated according to the official guides of the Agência Nacional de Vigilância Sanitária and European Medicine Agency, and showed linearity in plasmatic concentration range of 1-30 mg L-1, precision and accuracy values below 15%, beside selectivity. Both methods have been applied successfully to analysis of plasma samples of patients in treatment with TPM. Although universal detectors have a higher quantification limit compared with selective detectors, the method with conductometric detection developed in this work presented greater sensitivity than indirect method (DAD). Furthermore, it also presented advantages such as simplicity and low cost, showing feasibility in applying to routine analysis.

3

Sloupová, Klára. "Izolace čistých aminokyselin z pšeničných otrub." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449764.

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Wheat bran is a promising material containing a wide range of useful components, including proteins. In addition, it is produced in significant volumes. Currently, wheat bran is used for the production of energy by combustion and for feed purposes. Gradually, new methods of valorization of this material are being sought. One of the possibilities of using wheat bran is the isolation of proteins, hydrolysis, and separation of selected amino acids. This diploma thesis deals with this issue, it is focused on the recovery of arginine and leucine from a protein isolate. Proteins were extracted from wheat bran by changing the pH. Thanks to the subsequent lyophilization a protein isolate was gained. Prior to hydrolysis of the resulting isolate, a stability test of arginine and leucine amino acid standards was first performed, to which various hydrolysis methods were applied. Acid hydrolysis using a mineralizer, which was applied to the protein isolate, was proved to be the most effective. This was followed by the derivatization of the hydrolysates with OPA and analysis of the resulting hydrolysates by high-performance liquid chromatography with UV-VIS detection. Then, suitable adsorption and desorption conditions were optimized. It was found that the time dependence does not affect the amount of adsorbed material on the sorbent. Therefore, an application time of 15 minutes was chosen. While optimizing the amount of used standard, it was found that the optimal weight was 0.25 g of sorbent. The selected conditions were applied to the protein hydrolyzate. Two fractions were obtained by the separation of selected amino acids due to the change in the pH of the citrate buffer. After the application of this procedure, 0.26 g of arginine and 0.82 g of leucine were obtained from one kilogram after evaporation. From evaporation two, 1.01 g of arginine and 0.25 g of leucine were obtained after evaporation.

4

Fróes, Márcia Beatriz Reis. "Desenvolvimento de método para determinação de resíduos de pesticidas em frutas exóticas por dispersão da matriz em fase sólida e cromatografia líquida de alta eficiência com detector espectrofotométrico de absorção no UV-VIS com arranjo de diodos." Universidade Federal de Sergipe, 2010. https://ri.ufs.br/handle/riufs/6057.

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The fruits are an excellent source of nutrition, providing significant health benefits. The consumption of fruits with new flavors and high nutritional characteristics, called superfruits has been a worldwide trend, among them are assai and cupuassu. The presence of pesticide residues in food is a risk to the population's health. For this reagor, it is important to develop analytical methods for pesticide residues determination. The literature does not describe method for determination of pesticides in assai and cupuassu. In this context, this work aims to develop a new method based on MSPD and HPLC-UV/DAD determination of bromuconazole, fenbuconazole, parathion methyl, kresoxm-methyl and teflubenzuron in exotic fruits, assai and cupuassu. The extraction method based on matrix solid phase dispersion was developed and validated using different types and amounts of sorbents (neutral alumina, Florisil, silica and C18) and organic solvents (15-30 mL) ethyl acetate, dichloromethane, cyclohexane and acetonitrile. The best results for bromuconazole, fenbuconazole, parathionmethyl and kresoxim-methyl by HPLC-UV/DAD analysis were obtained using 1:3 (w / w) sample: the solid support (neutral alumina) ratio, without clean-up, and eluted with 20 mL of ethyl acetate: cyclohexane 1:1, v / v ratio. For assai, recovery values ranged from 57 to 119% with coefficients of variation values ranging from 1.4 to 20% for concentration levels 1, 2 and 6 μg mL-1. Detection and quantification limits ranged from 0.1 to 0.9 μg g-1 and 0.4 to 2.1 μg g-1, respectively. For cupuassu, recovery values were between 57-69%, the concentration level of 2 μg g-1.
As frutas constituem uma excelente fonte de alimentação, proporcionando importantes benefícios à saúde. O consumo de frutas com novos sabores e características nutricionais elevadas, chamadas de superfrutas, tem sido uma tendência mundial, entre elas se encontram o açaí e o cupuaçu. A presença de resíduos de pesticidas em alimentos constitui um risco a saúde da população, sendo importante o estudo de métodos analíticos para a determinação de seus resíduos. A literatura não registra método para a determinação de pesticidas em açaí e cupuaçu. Neste contexto, este trabalho tem como objetivo o desenvolvimento de um método baseado na MSPD e HPLC-UV/DAD para a determinação dos pesticidas bromuconazol, fenbuconazol, parationa-metílica, cresoxim-metílico e teflubenzuron em frutas exóticas, açaí e cupuaçu. O método de extração por dispersão da matriz em fase sólida foi desenvolvido, testando-se diferentes tipos e quantidades de suporte sólido (alumina neutra, Florisil, sílica e C18) e os solventes orgânicos (15 a 30 mL) acetato de etila, diclorometano, ciclohexano e acetonitrila. Os melhores resultados para os pesticidas bromuconazol, fenbuconazol, parationa-metílica e cresoxim-metílico em análise por HPLC-UV/DAD foram obtidas na utilização da proporção 1:3 (m/m) amostra:suporte sólido do solvente alumina neutra, sem etapa de limpeza (clean-up), e eluição com 20 mL de acetato de etila:ciclohexano na proporção 1:1, v/v. Para a matriz açaí, valores de recuperação entre 57-119 % e valores de coeficientes de variação na faixa de 1,4-20 % para os níveis de concentração 1, 2 e 6 μg mL-1, com limites de detecção e quantificação do método entre 0,1- 0,9 μg g-1 e 0,4 -2,1 μg g-1 , respectivamente. Para a matriz cupuaçu, valores de recuperação entre 57 - 69 %,ao nível de concentração de 2 μg g-1.

5

Lien, Wan-Fu. "Separation of Transition Metal Ions by HPLC, Using UV-VIS Detection." Thesis, North Texas State University, 1987. https://digital.library.unt.edu/ark:/67531/metadc501145/.

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HPLC has been used and can quickly determine several ions simultaneously. The method of determination described for transition metals [Cr(III), Fe(III), Ni(II), Co(II), Cu(II), Zn(II), Cd(II), Mn(II)] and [Ca(II), Pb(II)] using HPLC with UV-VIS detection is better than the PAR complexation method commonly used. The effects of both eluent pH and detector wavelength were investigated. Results from using different pHs and wavelengths, optional analytical conditions for the separation of [Ni(II), Co(II), Cu(II)], [Cr(III), Fe(III), Ca(II), Ni(II), Cu(II)], and [Ca(II), Zn(II), Pb(II)] in one injection, respectively, are described. The influence of adding different concentrations of Na_2EDTA solvent to the sample is shown. Detection limits, linear range, and the comparisons between this study and a post-column PAR method are given.

6

Williams, Elizabeth Mary. "Oxidation of human nitrosylhemoglobin monitored by UV-Vis and EPR Spectroscopies: detection of products and intermediates." Thesis, Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/williams/WilliamsE0805.pdf.

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7

Newkirk, Scott Hunter. "Detection levels of drinking water contaminants using field portable ultraviolet and visible light (uv/vis) spectrophotometry /." Download the thesis in PDF, 2005. http://www.lrc.usuhs.mil/dissertations/pdf/NEWKIRK2005.pdf.

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8

Liao, Jing-Piin. "Investigation of Copper-Natural Ligand Complexes by RP-HPLC Photodiode Array UV-VIS and Fluorescence Detection." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc332502/.

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In this study, reversed phase HPLC with dual UV photodiode (PDA) and fluorescence (FL) detection were used to investigate copper complexes with fulvic, caffeic, vanillic, salicylic, and adipic acids. Application of the RE method provided valuable information on the retention behavior and spectral characteristics of FA and model compounds. Even though the method was only applicable to VA, the use of the PDA detector allowed the UV-V is scanning of the separated peaks. This allowed the comparison between the UV-Vis spectra of uncomplexed species. The overall results provide an experimental framework for validation of the proposed Cu-humate interaction models.

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Špačková, Simona. "Optimalizace metody pro stanovení anorganických iontů za využití kapilární elektroforézy." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449419.

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Inorganic ions are one of the most important group chemicals. Their importance is crucial for all living organisms on the planet and monitoring of their content is essential for this purpose in clinical or environmental analysis but also in the food industry, agriculture or many other industries. Many analytical methods for ion detection have been designed and used, depending on the area of their use. Recently, numerous methods have been adapted to areas where not primarily intended. One such methods may be, for example, laser ablation with inductively coupled plasma mass spectrometry, which has recently begun to affect the analysis of biological samples. As a complementary method, able to detect also non-metallic ions is capillary electrophoresis. In this master thesis, the possibility of applying capillary electrophoresis with indirect photometric detection for the separation of inorganic ions in cell lysates of HeLa cells by capillary electrophoresis was verified. Main attention was paid to chloride ions. The ability to separate inorganic compounds in cellular material using salicylic acid as an absorbing anion in the base electrolyte was tested.

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Buchtová, Zuzana. "Stanovení karnitinu v potravních doplňcích." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216435.

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This work deals with the determination of L-carnitine in food supplements. L-carnitine is a substance naturally occurring in organism, essential for metabolism of fatty acids. In food supplements is used especially for reducing body weight as a "fat burner". L-carnitine is popular with athletes for improve athletic performance. While data are not available to support these positive effects of carnitine, the positive results of carnitine supplementation in the medicine were found, mainly on cardiovascular system. The literary part of this study describes the properties and the use of carnitine in the diet of human. Furthermore, a review of methods used for determination of L-carnitine in variety of samples is mentioned. In the experimental section the efficiency of SPE method for preparation matrix of real samples was investigated. A cation exchange solid phase extraction seems to be the most effective. The optimal conditions for isolation of L-carnitine by SPE extraction were not developed. L-carnitine was determined in six various food supplements by reverse phase chromatography with UV/VIS detection.

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Частини книг з теми "UV-VIS detector":

1

Karabudak, Engin, and Helmut Cölfen. "The Multiwavelength UV/Vis Detector: New Possibilities with an Added Spectral Dimension." In Analytical Ultracentrifugation, 63–80. Tokyo: Springer Japan, 2016. http://dx.doi.org/10.1007/978-4-431-55985-6_5.

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Kostova, Irena, Stefka Nachkova, Dan Tonchev, and Safa Kasap. "Synthesis, UV-VIS Spectroscopy and Conductivity of Silver Nanowires." In Nanoscience Advances in CBRN Agents Detection, Information and Energy Security, 175–82. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9697-2_18.

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3

Tabone, Tania, Georgina Sallmann, and Richard G. H. Cotton. "Mismatch Oxidation Assay: Detection of DNA Mutations Using a Standard UV/Vis Microplate Reader." In Methods in Molecular Biology, 235–42. Totowa, NJ: Humana Press, 2009. http://dx.doi.org/10.1007/978-1-60327-411-1_15.

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4

Méndez, Enrique, Julio Escribano, and Gabriel Gonzalez. "Direct Characterization of Proteins and Peptides in HPLC by Photodiode Array UV-VIS Detection: A New Approach in the Detection and Characterization of Polypeptides." In Methods in Protein Sequence Analysis, 293–300. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73834-0_39.

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5

León González, Zacarías. "Determination of the Unconjugated Forms of Benzophenone-3 and Benzophenone-4 in Urine by Solid-Phase Extraction Coupled to a Liquid Chromatographic System with UV/Vis Detection by Using Automated Sequential Injection Analysis." In Springer Theses, 83–102. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01189-9_3.

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Stevenson, Robert Lovell. "UV-VIS Absorption Detectors for HPLC." In Liquid Chromatography Detectors, 23–86. CRC Press, 2020. http://dx.doi.org/10.1201/9781003064947-2.

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Villamena, Frederick A. "UV–Vis Absorption and Chemiluminescence Techniques." In Reactive Species Detection in Biology, 203–51. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-12-420017-3.00006-2.

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Crego, Antonio L., and Maria Luisa Marina. "UV–Vis absorbance detection in capillary electrophoresis." In Analysis and Detection by Capillary Electrophoresis, 225–304. Elsevier, 2005. http://dx.doi.org/10.1016/s0166-526x(05)45005-9.

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Anton Okhai, Timothy, Azeez O. Idris, Usisipho Feleni, and Lukas W. Snyman. "Nanomaterial-Enhanced Receptor Technology for Silicon On-Chip Biosensing Application." In Biosensor - Current and Novel Strategies for Biosensing [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94249.

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Nanomaterials integration in biosensors designs are known to enhance sensing and signaling capabilities by exhibiting remarkably high surface area enhancement and intrinsic reactivity owing to their distinctive optical, chemical, electrical and catalytic properties. We present the synthesis and characterization of silver nanoparticles (AgNPs), and their immobilization on a silicon on-chip biosensor platform to enhance sensing capability for prostate specific antigen (PSA) - cancer biomarkers. Several techniques, including UV-Visible (UV-Vis) absorption spectrum, Fourier transforms infrared spectroscopy (FTIR), high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM) were used for characterizing the AgNPs. The biochemical sensor consists of AgNPs immobilized on the receptor layer of a silicon avalanche mode light emitting device (Si AM LED) which enables on-chip optical detection biological analytes. A bio-interaction layer etched from the chip interacts with the evanescent field of a micro dimensioned waveguide. An array of detectors below the receptor cavity selectively monitor reflected light in the UV, visible, infrared and far infrared wavelength regions. AgNPs used as an immobilization layer in the receptor layer enhances selective absorption analytes, causing a change in detection signal as a function of propagation wavelength as light is dispersed. The analytes could range from gases to cancer biomarkers like prostate specific antigen.

10

Hsine, Zouhour, and Rym Mlika. "Novel Sensor Based on Nanocarbon Transducer Functionalized by Iron (III) Porphyrin for the Impedimetric Detection of Bisphenol A." In Bisphenols [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98560.

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In this chapter, an impedimetric response of iron (III) porphyrin (Fe(III)TMPP) functionalized on gold transducer towards the detection of three phenolic compounds entitled bisphenol A (BPA), 2,2′-biphenol and catechol has been studied. The bisphenol A that has revealed the best affinity with Fe(III)TMPP membrane has been chosen as the target analyte. For improved sensitivity of Au/Fe(III)TMPP sensor towards BPA, a facile and efficient Au/RGO nanocarbon transducer based on reduced graphene oxide (RGO) has been prepared and used to support Fe(III)TMPP membrane. The obtained Au/RGO/Fe(III)TMPP structure was characterized by UV–visible (UV–vis) and electrochemical impedance spectroscopy (EIS) measurements, then applied as electrochemical platform for BPA detection. It has been discovered that the Au/RGO nanocarbon transducer has an amplified electron transfer kinetic compared to unmodified Au transducer. The Au/RGO/Fe(III)TMPP structure has showed a better affinity towards BPA with a doubled sensitivity compared to that obtained with Au/Fe(III)TMPP electrode. We demonstrated that the Au/RGO nanocarbon transducer not only enhances the electron transfer ability but also serves as a good template for the attachment of Fe(III)TMPP throughπ-π interaction. This study reveals new high-potential of nanocarbon transducer based on RGO for the conception of electrochemical sensors with high sensitivity and short response time.

Тези доповідей конференцій з теми "UV-VIS detector":

1

Bucconi, Andrea, Roberto Stalio, and G. F. Svelto. "Intensified-CCD detector head for the VIS-UV-EUV spectral range." In Optical Engineering and Photonics in Aerospace Sensing, edited by Sankaran Gowrinathan, C. Bruce Johnson, and James F. Shanley. SPIE, 1993. http://dx.doi.org/10.1117/12.161408.

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2

Cosentino, Rosario, Marcos Hernandez Diaz, Héctor Pérez Ventura, Sergio Campana, Riccardo Claudi, Pietro Schipani, Matteo Aliverti, et al. "Development status of the UV-VIS detector system of SOXS for the ESO-NTT telescope." In Ground-based and Airborne Instrumentation for Astronomy VIII, edited by Christopher J. Evans, Julia J. Bryant, and Kentaro Motohara. SPIE, 2020. http://dx.doi.org/10.1117/12.2561147.

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3

Fofana, I., Y. Hadjadj, E. Briosso, and J. Sabau. "Punctured rubber bladders detected by UV-vis spectroscopy." In 2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2016. http://dx.doi.org/10.1109/ceidp.2016.7785527.

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4

Cremer, Till, Melvin Aviles, Camden D. Ertley, Michael R. Foley, Alexey V. Lyashenko, Michael J. Minot, Mark A. Popecki, et al. "Imaging-quality ALD-GCA-MCPs for high-resolution, large area UV-VIS spectrometers." In X-ray, Optical, and Infrared Detectors for Astronomy IX, edited by Andrew D. Holland and James Beletic. SPIE, 2020. http://dx.doi.org/10.1117/12.2563353.

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5

Yang, Ailing, Weiwei Ren, Jinliang Zhang, and Mingming Tang. "A micro-spectroscopy system to measure UV-VIS spectra of single hydrocarbon inclusions." In International Symposium on Photoelectronic Detection and Imaging 2009, edited by Kun Zhang, Xiang-jun Wang, Guang-jun Zhang, and Ke-cong Ai. SPIE, 2009. http://dx.doi.org/10.1117/12.836018.

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Chen, Haixiu, Haifeng Xue, Jie Liu, Zhishuai Li, and Yan Hou. "Research on COD detection method based on UV-Vis spectroscopy." In International Symposium on Precision Mechanical Measurements 2019, edited by Liandong Yu. SPIE, 2019. http://dx.doi.org/10.1117/12.2548522.

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Bhagyaraj, Sneha, and Igor Krupa. "Alginate-Mediated Synthesis of Hetero-Shaped Silver Nanoparticles and their Hydrogen Peroxide Sensing ability." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0042.

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Silver nanoparticles have been the focus of extensive research for many decades due to their unique physical, chemical and electrical properties. Introducing new environmentally benign methods for the synthesis of silver nanoparticles is of great interest in the research community. In this work we propose a new method for the simple synthesis of stable heterostructured biopolymer (sodium alginate)-capped silver nanoparticles (Ag-NPs) based on green chemistry.The as-prepared nanoparticles were characterized using the ultraviolet–visible (UV–Vis) absorption spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and Dynamic light scattering (DLS) techniques. The results showed that the as-prepared Ag-NPs have a heterostructured morphology with particle size in the range 30 ± 18 – 60 ± 25 nm, showing a zeta potential of -62 mV. The silver nanoparticle formation was confirmed from UV-Vis spectra showing 424 nm as maximum absorption. The particle size and crystallinity of the as- synthesized nanoparticles were analyzed using TEM and XRD measurements respectively. FTIR spectra confirmed the presence of alginate as capping agent to stabilize the nanoparticles. The Ag-NPs also showed excellent sensing capability, with a linear response to hydrogen peroxide spanning a wide range of concentrations from 10-1 – 10-7 M, which indicates their high potential for water treatment applications, such as pollution detection and nanofiltration composites.

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Hu, Yingtian, Yizhang Wen, and Xiaoping Wang. "Detection of water quality multi-parameters in seawater based on UV-Vis spectrometry." In OCEANS 2016 - Shanghai. IEEE, 2016. http://dx.doi.org/10.1109/oceansap.2016.7485737.

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VOROZOV, N. N., V. A. YAKOVTSEVA, S. A. VOLCHEK, P. S. SMERTENKO, T. Ya GORBACH, and V. P. KOSTYLOV. "TEXTURED POROUS SILICON FOR EFFICIENT LIGHT DETECTION IN UV, VIS AND NIR SPECTRUM RANGES." In Physics, Chemistry and Application of Nanostructures - Reviews and Short Notes to Nanomeeting 2003. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812796738_0126.

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Strzalka, Halina, Shabir Hassan, Paul M. Donaldson, and Peter Hamm. "Heterodyne detected Transient Grating UV/VIS-pump IR-probe measurements of energy transport through proteins." In International Conference on Ultrafast Structural Dynamics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/icusd.2012.im3d.7.

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