Antioxidant Activities of Polyphenols Extracted from Perilla frutescens Varieties.Author(s): Christopher R Bryant
The DPPH radical scavenging activity was calculated as Trolox® [(±)-6-hydroxy-2,5,7,8- tetramethylchromane-2-carboxylic acid] equivalent antioxidant capacity (TEAC). The mean amount of total phenolics of the water extracts (4-29 μmol/100 mL) and the TEAC value calculated (23-167 μmol TE/100 mL) confirmed the high antioxidant activity of these leaf water extracts. These results were highly correlated with in some o-dihydroxylated polyphenolic compounds and AA. All reagents were of analytical grade. Cyanidin chloride and rosmarinic acid were purchased from Sigma-Aldrich, 2,2-dipheny-l-picrylhydrazyl radical (DPPH) and Trolox® [(±)-6-hydroxy-2,5,7,8-tetramethylchroman- 2-carboxylic acid] were supplied by Fluka and luteolin-7-O-glucoside by Extrasynthese.