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Molecules 2010, 15(4), 2152-2165; doi:10.3390/molecules15042152

Antioxidant Activity of Polysaccharide-enriched Fractions Extracted from Pulp Tissue of Litchi Chinensis Sonn.

1,2, 1,* , 1, 2, 1 and 1
1 Key Laboratory of Functional Food, Ministry of Agriculture, Bio-tech Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510610, China 2 College of Light Industry and Food Science, South China University of Technology, Guangzhou 510640, China
* Author to whom correspondence should be addressed.
Received: 17 December 2009 / Revised: 3 March 2010 / Accepted: 22 March 2010 / Published: 25 March 2010
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Natural antioxidants such as polysaccharides with strong antioxidant activities are used to protect against oxidative damage, yet little is known so far about the antioxidant effects of litchi fruit polysaccharides. In the present study, four different polysaccharide-enriched fractions were isolated from litchi pulp tissue and partially purified by a stepwise method of ethyl alcohol (EtOH) precipitation. Their chemical and physical characteristics were determined by chemical methods, gas chromatography and IR spectrophotometry. Antioxidant activities of these fractions were investigated using various in vitro assay systems. These four polysaccharide-enriched fractions exhibited a dose-dependent free radical scavenging activity as shown by their DPPH radical, superoxide anion and hydroxyl radical inhibition, chelating ability and reducing power. Among the different fractions, LFP-III showed the strongest scavenging activity against DPPH radical, superoxide and hydroxyl radicals and chelating ability. These findings suggest litchi polysaccharides from pulp tissue have potential as functional foods with enhanced antioxidant activity.
Keywords: antioxidant activity; litchi; polysaccharide; functional food antioxidant activity; litchi; polysaccharide; functional food
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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Kong, F.; Zhang, M.; Liao, S.; Yu, S.; Chi, J.; Wei, Z. Antioxidant Activity of Polysaccharide-enriched Fractions Extracted from Pulp Tissue of Litchi Chinensis Sonn.. Molecules 2010, 15, 2152-2165.

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