Purification and crystallization of xylitol from fermentation broth of corncob hydrolysates  

作　　者：Jinchao WEI Qipeng YUAN Tianxin WANG Le WANG 

机构地区：[1]State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China

出　　处：《Frontiers of Chemical Science and Engineering》2010年第1期57-64,共8页化学科学与工程前沿（英文版）

基　　金：supported by a grant from the National High Technology Research and Development Program of China(863 Program).

摘　　要：Xylitol,a five-carbon sugar alcohol,is a valuable sugar substitute,and widely used in the pharmaceutical,odontological and food industry due to its interesting properties.In the past decades,the xylitol industry has grown rapidly and more attention has been focused on xylitol purification,which possesses an important proportion of the whole industry.In our paper,the purification and crystallization of xylitol fermentation broth by biotechnology using corncob hydrolysates as substance were studied.An initial xylitol fermentation broth was decolored with activated carbon(1%M-1,60℃,165 rpm),desalted with a combination of two ionexchange resins(732 and D301),and residual sugars were separated with UBK-555(Ca^(2+)).Then the solution was vacuum-concentrated up to supersaturation(750 g/L xylitol).After adding 1%xylitol crystal seeds,the supersaturated solution was cooled to-20℃for 48 h.The crystalline xylitol of a regular tetrahedral shape with purity 95%and crystallization yield 60.2%was obtained from the clarified xylitol fermentation broth.An intact,economical and environmental-friendly route of purification and crystallization of xylitol from fermentation of corncob hydrolysates was obtained,and its experimental procedure and data provided a sound basis for large-scale industrial production.

关 键 词：XYLITOL CORNCOB activated carbon ionexchange resin PURIFICATION CRYSTALLIZATION 

分 类 号：TQ9[化学工程]