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Molecules 2009, 14(1), 133-140; doi:10.3390/molecules14010133
Article

Antioxidant Activities of Polyphenols Extracted from Perilla frutescens Varieties

1,2,3, 1,* , 2 and 3
Received: 11 November 2008 / Revised: 23 December 2008 / Accepted: 26 December 2008 / Published: 31 December 2008
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Abstract

Various cultivars of Perilla frutescens (L.) (var. crispa and var. frutescens) Britt. were harvested in China and Japan. They were easily differentiated on the basis of their foliage color, that varied from red to green. Water extracts of dried plants were investigated for their antioxidant activity (AA) and their polyphenolic compounds compared. Among them, cinnamic acid derivatives (coumaroyl tartaric acid, caffeic acid and rosmarinic acid), flavonoids (apigenin 7-O-caffeoylglucoside, scutellarein 7-O-diglucuronide, luteolin 7-O-diglucuronide, apigenin 7-O-diglucuronide, luteolin 7-O-glucuronide, and scutellarein 7-O-glucuronide) and anthocyanins (mainly cis-shisonin, shisonin, malonylshisonin and cyanidin 3-O-(E)-caffeoylglucoside-5-O-malonylglucoside) were quantified. AA assays are based on the inhibition of the free radical 2,2-diphenyl-1-picrylhydrazyl (DPPH). 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 within some o-dihydroxylated polyphenolic compounds and AA.
Keywords: Perilla frutescens; Polyphenolics; Anthocyanins; Flavonoids; Cinnamic acid derivatives; Antioxidant activity; DPPH Perilla frutescens; Polyphenolics; Anthocyanins; Flavonoids; Cinnamic acid derivatives; Antioxidant activity; DPPH
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Meng, L.; Lozano, Y.F.; Gaydou, E.M.; Li, B. Antioxidant Activities of Polyphenols Extracted from Perilla frutescens Varieties. Molecules 2009, 14, 133-140.

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