DPPH·法评价Vc、异Vc及其衍生物的抗氧化性能

Evaluation of antioxidant activity of L-ascorbic acid,D-isoascorbic acid and their derivatives by DPPH· assay

用DPPH.法评价了Vc、异Vc、辛醛Vc缩醛、辛醛异Vc缩醛、月桂酸Vc酯和月桂酸异Vc酯的抗氧化能力。结果表明,所有六种受试物清除DPPH.的能力随着浓度的增大而提高;摩尔数相等时,Vc与它的衍生物以及异Vc与它的衍生物清除DPPH.的能力基本相同;在受试物浓度低于1.397×10-4mol.L-1,并且浓度相同时,Vc及其衍生物比对应的异Vc及其衍生物具有更强的清除能力。

The antioxidant activity of L-ascorbic acid, D-isoascorbic acid, L-ascorbyl octyl aldehyde acetal, D- soascorbyl octyl aldehyde acetal, L-ascorbyl Laurate and D-isoascorbyl Laurate in ethanol were investigated by scavenging 1 ,1-Diphenyl-2-picrylhydrazyl free radical （DPPH · ）. The results showed that all the six tested samples had good scavenging DPPH · activity. The same molar number of L-ascorbic acid and its derivatives showed almost the same scavenging DPPH · activity. When the concentration of samples was lower than 1.397 × 10^-4mol · L^-1, the activity of scavenging DPPH · of L-ascorbic acid or its derivatives was higher than that of D- isoascorbic acid or its derivatives.