Abstract
Two pectin extracts from citrus peel were obtained with hydrochloric acid and ammonium oxalate,and then their pectin composition,monosaccharide composition and infrared spectral characteristics were analyzed.Moreover,the antioxidant activities of the two extracts were compared.The results indicated high DE(degree of esterification) in both extracts.The pectin prepared with hydrochloric acid(PEH) contained more rhamnose(5.4%,molar ratio) and a trace of mannose,and demonstrated a lower relative molecular mass than the pectin obtained with ammonium oxalate(PEA).However,PEA contained more mannose(5.3%,molar ratio) and arabinose(24.4%,molar ratio).Both pectins displayed absorption peaks at 1102,1018 cm-1 and 1745 cm-1 indicating the existence of uronic acid and CH3O-groups.They were effective at scavenging superoxide anion radical with scavenging rate of 77.0% and 68.0%,resepctively.In addition,DPPH radical and hydroxide radicals could be scavenged by both.
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