Antioxidant Activities of Some Polyphenols Evaluated by Different Chemical Methods and Correlation Analysis

Abstract

Abstract: The antioxidant activities of some polyphenols,such as tea polyphenol,gallic acid,quercetin,kaempferol,apigenin and vitamin E (as a control),were evaluated by different chemical methods,including α-deoxyribose assay,pyrogallol autoxidant assay,DPPH radical scavenging assay,ABTS radical scavenging assay and reducing power assay,and SAS software was applied to analyze the correlation between the results obtained by these methods. It was found that all the polyphenols have antioxidant activity,especially higher scavenging ABTS·+ activity. Tea polyphenol,gallic acid,quercetin are higher in antioxidant activity than the others. SAS analysis indicated that the result obtained by reducing power assay has extremely significant positive correlation with that obtained by DPPH· assay or ABTS+· assay(p<0.01). Meanwhile,the result obtained by ABTS+· assay has significant positive correlation with that obtained by DPPH· assay or α-deoxyribose assay(p<0.05).

Key words: polyphenols, antioxidant activity, correlation analysis

ZHANG Xin, ZHAO Xin-Huai. Antioxidant Activities of Some Polyphenols Evaluated by Different Chemical Methods and Correlation Analysis[J]. FOOD SCIENCE, 2008, 29(10): 85-89.

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Antioxidant Activities of Some Polyphenols Evaluated by Different Chemical Methods and Correlation Analysis

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