Showing papers on "DPPH published in 1980"
TL;DR: In this article, the hydrogen donating capabilities of antioxidants, such as butylated hydroryanisole (BHA), BHT, dl-α-tocopherol (Toc), sesamol and ethyl protocatechuic acid (EP), were investigated.
Abstract: The hydrogen donating capabilities of antioxidants, such as butylated hydroryanisole (BHA), butylated hydroxytoluene (BHT), dl-α-tocopherol (Toc), sesamol and ethyl protocatechuic acid (EP), to a stable free radical, 2, 2-diphenyl-1-picrylhydrazyl (DPPH), were investigated. Toc, sesamol and EP donated two hydrogen atoms, BHA donated 0.75-1.2 hydrogen atoms, and BHT donated much less hydrogen. A synergistic effect on hydrogen donation to DPPH was observed with the combinations of Toc+BHT and BHA+BHT. The synergistic effect observed in the reaction between BHA+BHT and DPPH might arise from the regeneration of BHA from its oxidized intermediate, with the loss of BHT.
47 citations
Journal Article•
TL;DR: In this paper, the anti-oxidant components in Panax ginseng, which were known to have antiaging effect, were fractionated by various solvents and then isolated by the preparative thin layer chromatography.
Abstract: The anti-oxidant components in Panax ginseng, which were known to have antiaging effect, were fractionated by various solvents and then isolated by the preparative thin layer chromatography. A developing system with silicagel G using toluene-chloroform-actene (20 : 13 : 13) as mobile phase was applied. The components were investigated the anti-oxidant activity by , (DPPH) at 517nm. Two effective components were obtained from red ginseng and were indophenol reducing substances.
1 citations