Preparative isolation of 1, 1-diphenyl-2-picrylhydrazyl inhibitors from Ribes himalense using medium-pressure and two-dimensional reversed-phase/reversed-phase liquid chromatography guided by an online HPLC-1, 1-diphenyl-2-picrylhydrazyl assay.
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DOI: 10.1002/jssc.202001080
Abstract: The lack of suitable chromatographic purification methods makes it a challenge to effectively isolate the chemical components of traditional Tibetan medicines. Ribes himalense is a rarely studied Tibetan medicine, reputed to have free radical-scavenging effects.… read more here.
Keywords: himalense; reversed phase; diphenyl picrylhydrazyl;
Targeted isolation of 1,1-diphenyl-2-picrylhydrazyl inhibitors from Saxifraga atrata and their antioxidant activities.
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DOI: 10.1002/jssc.202200040
Abstract: Saxifraga atrata is an important traditional Tibetan medicine used to treat cough and pneumonia, and has tremendous medicinal potential. In this study, we devised a technique to separate 1,1-diphenyl-2-picrylhydrazyl inhibitors from a methanol extract of… read more here.
Keywords: saxifraga atrata; liquid chromatography; diphenyl; diphenyl picrylhydrazyl ... See more keywords
Concentration-dependent HAT/ET mechanism of the reaction of phenols with 2,2-diphenyl-1-picrylhydrazyl (dpph˙) in methanol
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DOI: 10.1039/d2ra01033j
Abstract: The reaction of a 2,2-diphenyl-1-picrylhydrazyl radical (dpph˙) with phenols carried out in alcohols is a frequently used assay for estimation of the antiradical activity of phenolic compounds. The rates of reactions of dpph˙ with five… read more here.
Keywords: reaction; dpph; diphenyl picrylhydrazyl; concentration dependent ... See more keywords
The Interaction of Maleic Anhydride, N-Vinylpyrrolidone, and Their Mixture with 2,2-Diphenyl-1-picrylhydrazyl
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DOI: 10.1134/s1070363220050023
Abstract: Spectrophotometry studies have shown that N-vinylpyrrolidone and/or maleic anhydride interact with 2,2-diphenyl-1-picrylhydrazyl radical in a solution. Thermochemical parameters of the most probable reactions involving these compounds have been estimated by means of the PM6 and… read more here.
Keywords: anhydride vinylpyrrolidone; interaction maleic; diphenyl picrylhydrazyl; maleic anhydride ... See more keywords
Application of High-Performance Liquid Chromatography with Diode Array Detection to Simultaneous Analysis of Reference Antioxidants and 1,1-Diphenyl-2-picrylhydrazyl (DPPH) in Free Radical Scavenging Test
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DOI: 10.3390/ijerph19148288
Abstract: Antioxidant activity can be analyzed by various methods, both in vitro and in vivo. The widely used colorimetric method using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging reaction has many limitations, such as interference from photosynthetic pigments… read more here.
Keywords: dpph; diphenyl picrylhydrazyl; radical scavenging; free radical ... See more keywords