2013•Unpublished venueRequires access
Investigation of In-vitro Antioxidant Potential of Thai Medicinal Plant Extracts
Worrawat Promden, Wittawat Viriyabancha, Orawan Monthakantirat, Wanchai De‐Eknamkul
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Abstract
Methanolic extracts of 27 Thai medicinal plants,
traditionally used in different ailments, were evaluated for
antioxidant potential using 2,2-diphenyl-1-picrylhydrazyl
(DPPH) assay and oxygen radical absorbance capacity assay
(ORAC). In comparison with controls, in the DPPH assay, six
extracts (6CD, 22ST, 20SG, 21SpC, 23SV and 14OI) showed
higher activities than ascorbic acid (SC50 = 6.07 μg/ml), In the
ORAC assay, all species also show good antioxidant capacity
(>2 μmole of TE / μg sample). The ORAC values were seem
to be correlated with the DPPH values which the six extracts
revealed high levels of antioxidant activity according to both
methods, and thus could be potential rich sources of natural
antioxidants.