酵母发酵生产木糖醇的研究

摘要

Xylitol is a naturally existing sugar alcohol,and is currently produced by chemical synthesis on a large scale.In recent years the bioconversion of D-xylose from lignocellulosic residues into xylitol gained an increased attention.As an alternative way of production,it is high efficiency and less cost.The microorganisms used in the biotechnological method have to be able to utilize xylose.Yeast is proved to be very efficient in xylitol production.Our study is focused on xylose transport and metabolism within the yeast cell,and factors that can affect xylitol production.The optimization of xylitol bioconversion is also discussed.%木糖醇是一种天然存在的糖醇,通过化学方法目前已经实现了规模化生产.近几年科研人员对发酵生产木糖醇的关注度很高,因为由半纤维素水解得到的木糖料液直接发酵生产木糖醇,具有工序步骤短、产品更天然、生产安全容易保障的优点.要发酵生产木糖醇,首先微生物必须能够利用木糖,从国内外的研究来看,酵母在发酵生产木糖醇方面具有很大的优势.本文主要综述了木糖在酵母细胞中的运输与代谢、影响发酵生产木糖醇的因素,以及优化发酵生产木糖醇的方法.