Disclosed is a polyuronic acid having an average degree of polymerization less than 20. The method of the present invention comprises the steps: (a) providing a solution containing 5 wt. % or more of a high molecular weight polyuronic acid predominantly as its lithium salt; (b) adding hydrogen peroxide and a ferrous salt to the solution prepared in step (a) to oxidatively degrade the high molecular weight polyuronic acid; and (c) isolating a polyuronic acid having an average degree of polymerization less than 20 obtained in step (b).
本发明公开了一种平均聚合度小于20的聚醛酸。本发明的方法包括以下步骤:(a)提供一个溶液,其中包含5重量%或更多的高分子量聚醛酸,主要以其
锂盐形式存在;(b)向步骤(a)中制备的溶液中加入
过氧化氢和一种
铁盐,以氧化降解高分子量聚醛酸;(c)分离得到在步骤(b)中获得的平均聚合度小于20的聚醛酸。