果胶酸pectic acid
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1017
组成果胶质的物质成分之一,是以钙盐或镁盐的形态构成细胞壁中胶层的主要成分。为不含甲酯基的D-半乳糖醛酸的复合体,由α -1- 4键形成主链。可被果胶酯酶所作用,另外用稀碱处理可被完全碱化,再用盐酸中和,可获得胶样物质。可通过钙的作用形成不溶于水的凝胶,但与糖(双糖)则不形成凝胶。估计复合度在 200以上。
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