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Radical scavenging and anti-lipoperoxidative activities of Smallanthus sonchifolius leaf extracts. | LitMetric

Radical scavenging and anti-lipoperoxidative activities of Smallanthus sonchifolius leaf extracts.

J Agric Food Chem

Palacký University, Faculty of Medicine, Institute of Medical Chemistry and Biochemistry, Hnevotínská 3, CZ-77515 Olomouc, Czech Republic.

Published: July 2005

AI Article Synopsis

Article Abstract

Radical scavenging and anti-lipoperoxidative effects of two organic fractions and two aqueous extracts from the leaves of a neglected Andean crop-yacon (Smallanthus sonchifolius Poepp. & Endl., Asteraceae) were determined using various in vitro models. The extracts' total phenolic content was 10.7-24.6%. They exhibited DPPH (IC50 16.14-33.39 microg/mL) and HO* scavenging activities (4.49-6.51 mg/mL). The extracts did not scavenge phenylglyoxylic ketyl radicals, but they retarded their formation. In the xanthine/xanthine oxidase superoxide radical generating system, the extracts' activities were 26.10-37.67 superoxide dismutase equivalents/mg. As one of the extracts displayed xanthine oxidase inhibitory activity, the effect of the extracts on a nonenzymatically generated superoxide was determined (IC50 7.36-21.01 microg/mL). The extracts inhibited t-butyl hydroperoxide-induced lipoperoxidation of microsomal and mitochondrial membranes (IC50 22.15-465.3 microg/mL). These results make yacon leaves a good candidate for use as a food supplement in the prevention of chronic diseases involving oxidative stress.

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Source
http://dx.doi.org/10.1021/jf050403oDOI Listing

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