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发表于 2006-11-29 14:24:59
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Fifty-four different extracts of nine Bolivian plants belonging to the family Asteraceae were evaluated for their
radical scavenging activity by the DPPH, NBT/hypoxanthine superoxide, and OH/luminol chemiluminescence
methods, and for their antioxidant activity by the h-carotene bleaching test. The total phenolic content was also
determined by the Folin-Ciocalteu method, and the oxidative stability by the Rancimat test. Both remarkably high
phenolic content and radical scavenging and antioxidant activities were found mainly in the ethyl acetate fractions
among the different plant extracts. Some ethyl acetate and even some defatted crude extracts exhibited activities
comparable to those of commercial extracts/compounds, thus making it possible to consider some of the studied
plants as a potential source of antioxidants of natural origin.
D 2003 Elsevier Inc. All rights reserved. |
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