木糖醇微生物转化的研究

Production of Xylitol by Microorganisms

一、引言 木糖醇是一种被广泛用于国防、医药、食品和化学等工业的五碳糖醇。木糖醇也是一种具有营养价值的甜味剂，由于它的代谢不需胰岛素，可作为糖尿病人的食糖代用品。另外木糖醇还可以作为防龋食品。目前国内外生产木糖醇的方法是化学法。

The optimum xylitol fermentation conditions from D-xylose were studied. The results showed that the temperature was 35℃, the initial pH was about 4.0, and proper oxygen and nutrition were provided. The xylitol yield of 85.0% from xylose was obtained when yeast nitrogen base(YNB) was added. YNB could be substituted for bean cake powder as an additive with a yield of 69.3%.