Cnide polysaccharides extracted from the elm bark with water were identified by UV and IR spectra analysis. GC analysis shows that the crude polysaccharides are composed of arabinose, xylose, mannose, galactose, glucose and mannitol. The concentration of polysaccharides is between 0.6-1. 5 g ? L-1 by the Prussian blue method. The reduction capacity of the polysaccharides is 50% -70% higher than that of the contrast material Vc. Smirnoff method confirms that when the concentration of polysaccharide is greater than 0. 211 0 g· L-1 , the hydroxyl radical scavenging capacity is significant, but it is significantly worse than that of Vc. The polysaccharides have some antioxidant properties, which is proved by the pyro-gallol autoxidation method.%以水提取榆树皮中的粗多糖,经紫外和红外光谱分析证明,此提取物为粗多糖.气谱分析结果表明,粗多糖由阿拉伯糖、木糖、甘露糖、半乳糖、葡萄糖和甘露醇组成.普鲁士蓝法测试粗多糖质量浓度为0.6～1.5g·L-1,其还原能力高出阳性对照物Vc的50％～70％.Smimoff法测试榆树粗多糖对羟自由基有清除能力,当多糖质量浓度大于0.2110g·L-1时,对羟自由基有一定的清除效果,但清除率明显小于Vc.邻苯三酚自氧化法分析粗多糖,证明其具有一定抗氧化性能.
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