Antioxidant Principles from Bauhinia tarapotensis
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- 8 June 2001
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of Natural Products
- Vol. 64 (7) , 892-895
- https://doi.org/10.1021/np0100845
Abstract
A new cyclohexenone (1) and a new caffeoyl ester derivative (2), together with the known compounds (−)-isolariciresinol 3-α-O-β-d-glucopyranoside (3), (+)-1-hydroxypinoresinol 1-O-β-d-glucopyranoside (4), isoacteoside (5), luteolin 4‘-O-β-d-glucopyranoside (6), and indole-3-carboxylic acid (7), were isolated from the leaves of Bauhinia tarapotensis. The structures of these new compounds were determined by spectroscopic data analysis. The antioxidant activities of 1−7 were determined by measuring their free radical scavenging effects, using the 1,1-diphenyl-2-dipicrylhydrazyl free radical (DPPH) and Trolox equivalent antioxidant activity (TEAC) methods, and the coupled oxidation of β-carotene and linoleic acid. Compounds 3−5 showed good activities in the DPPH and TEAC tests, while compounds 1 and 2 were active in the coupled oxidation of β-carotene and linoleic acid bioassay.Keywords
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