Studies on the antioxidants. XIII. Hydrogen donating capability of antioxidants to 2,2-diphenyl-1-picrylhydrazyl.
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چکیده
منابع مشابه
The potential pitfalls of using 1,1-diphenyl-2-picrylhydrazyl to characterize antioxidants in mixed water solvents.
Approaching living systems, aqueous solutions are appropriate to characterize antioxidants, whereas the frequently used standard 1,1-diphenyl-2-picrylhydrazyl (DPPH) is insoluble in water. Therefore, mixed water-ethanol solvents were investigated using the electron paramagnetic resonance (EPR) spectroscopy. Two forms of DPPH were identified: at higher ethanol ratios a quintet spectrum character...
متن کاملPotent 2,2-diphenyl-1-picrylhydrazyl radical-scavenging activity of novel antioxidants, double-stranded tyrosine residues conjugating pyrocatechol.
New potent antioxidants conjugating the catechol (=pyrocatechol; pyrCat) group to two N-termini of modified double-stranded tyrosine residues were synthesized and showed radical scavenging activity with 2,2-diphenyl-1-picrylhydrazyl radical (DPPH radical, DPPH˙) as a free radical model, second-order rate constants for the DPPH˙ scavenging reaction, and the results from electron spin resonance (...
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A 2,2-diphenyl-1-picrylhydrazyl radical (DPPH˙) was successfully solubilised in water by β-cyclodextrin (β-CD). DPPH˙/β-CD thus obtained was demonstrated to be a powerful tool to evaluate the antioxidative activity of water-soluble antioxidants, such as ascorbate and Trolox, in aqueous buffer solutions.
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متن کامل21 Protection Studies by Antioxidants Using Single
Oxidation-reduction reactions, simply referred as “redox” reactions, describe all the chemical reactions in which atoms have their oxidation state changed. This can either be a simple redox process like the oxidation of carbon (C) to carbon dioxide (CO2) or the reduction of C by hydrogen (H) to yield methane (CH4). However, in biology redox reactions are rather complex and ‘redox biology’ is fu...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1980
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.28.2089