Готові списки джерел за темами / Anthracene sulfonic acid (ASA)

Добірка наукової літератури з теми "Anthracene sulfonic acid (ASA)"

Автор: Grafiati

Опубліковано: 15 вересня 2021

Оновлено: 8 лютого 2022

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Статті в журналах з теми "Anthracene sulfonic acid (ASA)":

Klink, Michael, Richard Akinyeye, Vernon Somerset, Mantoa Sekota, Priscilla Gloria Lorraine Baker, and Emmanuel Iheanyechukwu Iwuoha. "Electrochemical and Spectroscopic Dynamics of Nanostructured Polynuclear Sulphonic Acid-Doped Poly(2, 5-dimethoxyaniline)." Materials Science Forum 657 (July 2010): 231–48. http://dx.doi.org/10.4028/www.scientific.net/msf.657.231.

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Conducting and electroactive nanostructured poly(2, 5-dimethoxyaniline), PDMA, doped with anthracene sulphonic acid, ASA, and phenanthrene sulphonic acid, PSA, respectively, were prepared by oxidative polymerisation of 2, 5-dimethoxyaniline, DMA, with ammonium persulphate as oxidant. Scanning electron microscope, SEM, images of the polymers showed well defined nanotubes and fibrils with diameters of between 50 to 100 nm and 200 to 300 nm for PDMA-ASA and PDMA-PSA, respectively. Evidence of the incorporation of ASA and PSA into the PDMA backbone was provided by UV-Vis and FTIR analyses. Electrochemical interrogation of the sulphonic acid-doped polymers by cyclic voltammetry showed that both PDMA-ASA and PDMA-PSA exhibit quazi-reversible electrochemistry. The standard rate constant, ko, for the charge transfer reactions of PDMA-ASA and PDMA-PSA were 3.81 x 10-4 cm s-1 and 3.27 x 10-5 cm s-1, respectively. There was a relationship between the ko value and the formal potential, E0ʹ, of the polymeric nanomaterial. PDMA-ASA that had larger ko value gave an E0ʹ value of 134 mV which was lower than that of PDMA-PSA by 19 mV, indicating that PDMA-ASA has lower activation energy than PDMA-PSA for the electron transfer process Electrochemical impedance spectroscopy over a range of potentials showed that the polymeric nanotubues exhibited high conductivities, though the SA-doped polymer was more conducting.

Liu, Yulong, and Xiufu Hua. "Degradation of acenaphthylene and anthracene by chemically modified laccase from Trametes versicolor." RSC Adv. 4, no. 59 (2014): 31120–22. http://dx.doi.org/10.1039/c4ra02807d.

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We are studying the chemically modified laccase from Trametes versicolor for use in the in vitro oxidation of two polycyclic aromatic hydrocarbons (PAHs), acenaphthylene and anthracene, in combination with 2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) as a redox mediator.

Ancha, Hanumantha R., Ravi R. Kurella, Christine C. McKimmey, Stanley Lightfoot, and Richard F. HartY. "Luminal Antioxidants Enhance the Effects of Mesalamine in the Treatment of Chemically Induced Colitis in Rats." Experimental Biology and Medicine 233, no. 10 (October 2008): 1301–8. http://dx.doi.org/10.3181/0805-rm-140.

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Previous experiments in rats with chemically induced colitis have shown that the antioxidant N-acetylcysteine plus mesalamine (5-ASA) exerted a significantly greater therapeutic effect in promoting mucosal healing when compared to either agent alone. The aims of the present study were to compare the effects of three antioxidants plus mesalamine vs. 5-ASA alone in treatment of colitis induced by trinitrobenzene sulfonic acid (TNBS) in rats. Methods: Three days following induction of TNBS colitis, rats received 8 days of rectal therapy with 5-ASA, or 5-ASA plus vitamin C (ascorbic acid), 5-ASA plus phenyl butylnitrone (PBN) and 5-ASA plus vitamin E (α-tocopherol). Distal colonic tissues were examined for microscopic colitis and myeloperoxidase (MPO) activity. Results: Global assessments of microscopic colitis induced by TNBS indicated that 5-ASA alone significantly changed colonic injury by −31%. Combination therapy with ascorbic acid plus 5-ASA or α-tocopherol plus 5-ASA caused further significant change in TNBS colitis by −65 and −82%, respectively. Each of these values was significantly below scores observed with 5-ASA as monotherapy. Reduction in colitis with PBN plus 5-ASA was not different from 5-ASA alone. MPO activity was decreased significantly in response to monotherapy with 5-ASA and each of the antioxidants plus 5-ASA when compared to TNBS. α-Tocopherol plus 5-ASA, however, was the only treatment strategy that reduced significantly MPO activity below that recorded for 5-ASA alone. In conclusion, our results indicate that antioxidants other than N-acetylcysteine significantly enhance the therapeutic effectiveness of 5-ASA in the treatment of TNBS colitis. α-Tocopherol plus 5-ASA exerted profound anti-inflammatory and reparative effects upon colitis induced by TNBS.

Gaafar, Alaa A., Sami I. Ali, Mohamed A. El-Shawadfy, Zeinab A. Salama, Agnieszka Sękara, Christian Ulrichs, and Magdi T. Abdelhamid. "Ascorbic Acid Induces the Increase of Secondary Metabolites, Antioxidant Activity, Growth, and Productivity of the Common Bean under Water Stress Conditions." Plants 9, no. 5 (May 14, 2020): 627. http://dx.doi.org/10.3390/plants9050627.

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One of the most vital environmental factors that restricts plant production in arid and semi-arid environments is the lack of fresh water and drought stress. Common bean (Phaseolus vulgaris L.) productivity is severely limited by abiotic stress, especially climate-related constraints. Therefore, a field experiment in split-plot design was carried out to examine the potential function of ascorbic acid (AsA) in mitigating the adverse effects of water stress on common bean. The experiment included two irrigation regimes (100% or 50% of crop evapotranspiration) and three AsA doses (0, 200, or 400 mg L−1 AsA). The results revealed that water stress reduced common bean photosynthetic pigments (chlorophyll and carotenoids), carbonic anhydrase activity, antioxidant activities (2,2-diphenyl-1-picrylhydrazyl free radical activity scavenging activity and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation assay), growth and seed yield, while increased enzymatic antioxidants (peroxidase), secondary metabolites (phenolic, flavonoids, and tannins), malondialdehyde (MDA), and crop water productivity. In contrast, the AsA foliar spray enhanced all studied traits and the enhancement was gradual with the increasing AsA dose. The linear regression model predicted that when the AsA dose increase by 1.0 mg L−1, the seed yield is expected to increase by 0.06 g m−2. Enhanced water stress tolerance through adequate ascorbic acid application is a promising strategy to increase the tolerance and productivity of common bean under water stress. Moreover, the response of common bean to water deficit appears to be dependent on AsA dose.

Park, Heejung, Wooseong Kim, Dayoon Kim, Seongkeun Jeong, and Yunjin Jung. "Mesalazine Activates Adenosine Monophosphate-activated Protein Kinase: Implication in the Anti-inflammatory Activity of this Anti-colitic Drug." Current Molecular Pharmacology 12, no. 4 (October 15, 2019): 272–80. http://dx.doi.org/10.2174/1874467212666190308103448.

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Objective: Mesalazine, 5-aminosalicylic acid (5-ASA), is an anti-inflammatory drug that is most widely used for the treatment of Inflammatory Bowel Disease (IBD). Despite extensive clinical use, the exact pharmacological mechanism underlying the anti-colitic effects of 5-ASA has not yet been elucidated. A potential molecular mechanism underlying 5-ASA-mediated anti-colitic activity was investigated. Methods: An anti-inflammatory pharmacology of 5-ASA was scrutinized in human colon carcinoma cells and murine macrophages and in a TNBS-induced rat colitis model. Results: 5-ASA induced phosphorylation of adenosine monophosphate-activated protein kinase (AMPK) and its substrate acetyl-CoA carboxylase in cells. 5-ASA activation of AMPK occurred regardless of the presence of the pro-inflammatory mediators, Tumor Necrosis Factor Alpha (TNF-α) and lipopolysaccharide. 5-ASA inhibits TNF-α-dependent Nuclear Factor-Kappa B (NF-κB) activation, which was dampened by AMPK inhibition. Oral gavage of sulfasalazine (a colon-specific prodrug of 5- ASA) or rectal administration of 5-ASA ameliorated 2,4,6-trinitrobenzene sulfonic acid (TNBS)- induced rat colitis and activated AMPK in the inflamed colonic tissues while markedly diminishing the levels of NF-κB-regulated pro-inflammatory mediators cyclooxygenase-2, inducible nitric oxide synthase, and cytokine-induced neutrophil chemoattractant-3, elevated by the induction of inflammation. Rectal co-administration of 5-ASA and an AMPK inhibitor undermined 5-ASA-mediated activation of AMPK and its anti-colitic effects. Conclusion: These findings suggest that the activation of AMPK is involved in 5-ASA-mediated anticolitic effects at least partly via interference with pro-inflammatory NF-κB signaling.

Sun, Yue, Xiao Li, Weisheng Zheng, Xinchun Ding, and Rajendra Prasad Singh. "Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution." Applied Sciences 10, no. 1 (December 18, 2019): 1. http://dx.doi.org/10.3390/app10010001.

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Adsorption using anion exchange resins is an efficient method for the removal of aromatic sulfonic acids (ASAs) from industrial wastewater. In this study, a series of weak-base anion exchangers (SD1–SD5) were synthesized to investigate the effect of functional group density of resins on the adsorption of ASAs from wastewater containing competitive inorganic anions. p-Toluene sulfonic acid (PTSA) was selected as a target pollutant, and Na2SO4 was chosen as the competitive inorganic salt because of its widespread existence in industrial wastewater. Adsorption performances of these resins were evaluated and compared in terms of selectivity, kinetics, isotherms, regeneration, and dynamic adsorption behavior. Importantly, the PTSA uptake increased with the raising content of functional groups on resins in the absence of Na2SO4; however, in the presence of a high level of Na2SO4 (for example, ≥1%), a decrease in the functional group density could improve the adsorption capacity of resins for PTSA. Moreover, desorption and fixed bed column experiments were conducted in all resins, thereby confirming the effect of functional group density of resins on the PTSA adsorption in actual application. In brief, this research will provide a better understanding for the design and preparation of anion exchangers for the effective removal of ASA from wastewater.

Soare, Rodica, Maria Dinu, Cristina Babeanu, and Marin Soare. "Evaluation and comparison of antioxidant activity and biochemical compounds in some coloured potato cultivars." Plant, Soil and Environment 66, No. 6 (June 23, 2020): 281–86. http://dx.doi.org/10.17221/202/2020-pse.

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Potato is an important source of food, and in recent years, new genotypes have emerged on the European market, which particularly differentiate by the colour of tubers. The current study investigated and compared phytochemical properties and antioxidant activity of six potato cultivars: two of those with yellow-fleshed (Carpatin, Brasovean) and four with red and purple-fleshed (Cranberry Red, Mountain Rose, Purple Majesty, and Blue Congo), which were cultivated under the same climatic and soil conditions. The antioxidant activities were evaluated using two antioxidant systems 2,2-diphenyl-1-picrylhydrazyl (DPPH) and 2,2'-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS). The results show that yellow-fleshed cultivars had higher total soluble substance content; red and purple-fleshed cultivars had a higher content of antioxidant compounds. Cv. Blue Congo it was recorded the highest antioxidant capacity in terms of DPPH and ABTS, of 164.17 μmol ascorbic acid (AsA)/100 g FW (fresh weight) and 114.96 μmol AsA/100 g FW, respectively. The highest total phenolic content was registered at cv. Purple Majesty of 63.54 mg gallic acid equivalents/100 g FW. Regarding flavonoids, the highest content was 40.96 mg quercetin equivalents/100 g FW for cv. Blue Congo and anthocyanin at cv. Purple Majesty of 113.19 mg/100 g FW.

Kundu, Sudipta K., Ramana Singuru, Taku Hayashi, Yuh Hijikata, Stephan Irle, and John Mondal. "Constructing Sulfonic Acid Functionalized Anthracene Derived Conjugated Porous Organic Polymer for Efficient Metal-Free Catalytic Acetalization of Bio-Glycerol." ChemistrySelect 2, no. 17 (June 12, 2017): 4705–16. http://dx.doi.org/10.1002/slct.201700901.

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Johannes, Christian, and Andrzej Majcherczyk. "Natural Mediators in the Oxidation of Polycyclic Aromatic Hydrocarbons by Laccase Mediator Systems." Applied and Environmental Microbiology 66, no. 2 (February 1, 2000): 524–28. http://dx.doi.org/10.1128/aem.66.2.524-528.2000.

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ABSTRACT The oxidation of polycyclic aromatic compounds was studied in systems consisting of laccase from Trametes versicolor and so-called mediator compounds. The enzymatic oxidation of acenaphthene, acenaphthylene, anthracene, and fluorene was mediated by various laccase substrates (phenols and aromatic amines) or compounds produced and secreted by white rot fungi. The best natural mediators, such as phenol, aniline, 4-hydroxybenzoic acid, and 4-hydroxybenzyl alcohol were as efficient as the previously described synthetic compounds ABTS [2,2′-azino-bis-(3-ethylbenzothiazoline-6-sulfonic acid)] and 1-hydroxybenzotriazole. The oxidation efficiency increased proportionally with the redox potentials of the phenolic mediators up to a maximum value of 0.9 V and decreased thereafter with redox potentials exceeding this value. Natural compounds such as methionine, cysteine, and reduced glutathione, containing sulfhydryl groups, were also active as mediator compounds.

Silbernagl, S., K. Volker, H. J. Lang, and W. H. Dantzler. "Taurine reabsorption by a carrier interacting with furosemide in short and long Henle's loops of rat nephrons." American Journal of Physiology-Renal Physiology 272, no. 2 (February 1, 1997): F205—F213. http://dx.doi.org/10.1152/ajprenal.1997.272.2.f205.

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Taurine is net reabsorbed in the proximal convolution by Cl- -stimulated Na+ symport specific for beta-amino acids but not in later nephron segments. However, large unidirectional taurine transport takes place there. To investigate unidirectional taurine reabsorption, we comicroinfused [3H]taurine and [14C]inulin into late proximal (LP), early distal (ED), and late distal (LD) tubule segments, as well as into the tips of long loops of Henle (LLH) of rats in vivo, and determined fractional reabsorption of [3H]taurine (FR) in the ipsilateral urine. FR (9 micromol/l taurine) was 80-93 (LP), 16 (ED), and 8% (LD). At 26 mmol/l taurine, FR decreased to 13 (LP) and 6% (ED). FR also decreased when Na+ or Cl- was absent or furosemide (5 x 10(-5) mol/l) was added. Bumetanide (5 x 10(-5) mol/l) had no effect, whereas aniline-2-sulfonic acid (ASA) inhibited. During LLH microinfusion, FR was 55% at 66 micromol/l and 17% at 228 micromol/l and was again inhibited by furosemide and ASA but not by bumetanide. [14C]taurine reabsorption from microperfused proximal convolutions was not influenced by furosemide. Chronic water diuresis did not affect taurine reabsorption in short Henle's loops. We conclude that taurine can enter cells of the distal nephron from the lumen by an Na+- and partly Cl- -dependent carrier with which C alpha,beta-substituted taurine (ASA) and C alpha,beta- and N-substituted beta-alanine (furosemide) directly interact. Thus proximal and distal taurine carriers seem to be different.

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Дисертації з теми "Anthracene sulfonic acid (ASA)":

Molapo, Kerileng Mildred. "Electro chemiluminescence and organic electronics of derivatised poly(aniline sulphonic acid) light-emitting diodes." University of the Western Cape, 2011. http://hdl.handle.net/11394/8437.

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>Magister Scientiae - MSc
Electrochemiluminescence (EeL) is applied for industrial applications that have considerable potential, such as clinical diagnostic, analytical chemistry, and light-emitting devices, due to selectivity, sensitivity for detection and quantification of molecules through generation of fluorescence light when electric current is applied on the materials. In EeL the electrochemical reaction allows for precise control over the time and position of the light emitting reaction. The control over time allows one to synchronise the luminescence and the biochemical reaction under study and control over position not only improves sensitivity of the instrument by increasing the signal to noise ratio, but also allows multiple analytical reactions in the same sample to be analyzed using an electrode array. The EeL generation fluorescent materials are based on inorganic semiconductor materials for light-emitting devices. Further progress in this EeL field mainly depends on discovery of new advanced materials, interfacial films and nanoparticle coatings, advances in microfluidics leading to total increase in EeL properties. There has been extensive use of polymers for enhancement of EeL properties. Electrochemiluminescent conjugated polymers constitute a new class of fluorescent polymers that emit light when excited by the flow of an electric current. These new generation fluorescent materials may now challenge the domination by inorganic semiconductor materials for the commercial market of light-emitting devices such as lightemitting diodes and polymer laser devices (PLDs).