Effect of acetylation on antioxidant and cytoprotective activity of polysaccharides isolated from pumpkin (Cucurbita pepo, lady godiva)

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• 作者：Yi Song ; Yang Yang ; Yuyu Zhang ; Liusheng Duan ; Chunli Zhou ; Yuanying Ni ; Xiaojun Liao ; Quanhong Li ; Xiaosong Hu
• 关键词：Pumpkin ; Polysaccharide ; Acetylation ; Antioxidant activity ; Cytoprotective effect
• 刊名：Carbohydrate Polymers
• 出版年：2013
• 出版时间：15 October, 2013
• 年：2013
• 卷：98
• 期：1
• 页码：686-691
• 全文大小：732 K

文摘

Acetylation of pumpkin (Cucurbita pepo, lady godiva variety) polysaccharide using acetic anhydride with pyridines as catalyst under different conditions was conducted to obtain different degrees of acetylation on a laboratory scale. Furthermore, antioxidant activities and cytoprotective effects of pumpkin polysaccharide and its acetylated derivatives were investigated employing various established in vitro systems. Results showed that addition of pyridine as catalyst could increase the degree of substitution, whereas volume of acetic anhydride had little effect. The acetylated polysaccharides in DPPH scavenging radical activity assay, superoxide anion radical activity assay and reducing power assay exhibited higher antioxidant activity than that of unmodified polysaccharide. H₂O₂-induced oxidative damages on rat thymic lymphocyte were also prevented by pumpkin polysaccharide and its acetylated derivatives and the derivatives presented higher protective effects. On the whole, acetylated polysaccharide showed relevant antioxidant activity both in vitro and in a cell system.