木糖醇的发酵法生产

Fermentative Production of Xylitol

木糖醇的发酵法生产是一种很有前途的生产方法。有多种微生物可产木糖醇 ,其中酵母是最好的木糖醇生产菌。木糖醇的生产过程中有许多影响因素 ,如通气率、木糖浓度、氮源、pH和温度等。目前研究表明 :菌株培养早期应维持较高水平的通气率 ,而后应当降低菌株的呼吸率。铵盐是最好的无机氮源 ,酵母提取物是最好的有机氮源。最适pH范围为 4～ 6 ,最适温度范围为 4 8～ 30℃。

Fermentative production of xylitol is a promising process. There are many kinds of microorganism that can produce xylitol, in which yeast is the best producer of xylitol. There are many factors in the process of xylitol, such as aeration rate, xylitol concentration, nitrogen sources, pH and temperature. At present, studies indicate: the higher level of aeration rate required only at the earlier phase of cultivation and thereafter it should be decreased to the lower level of the respiration of the microorganism. Ammonium salts is the best inorganic nitrogen sources, and yeast extract is the best organic nitrogen sources. The range of pH optimum is 4～6,and the range of temperature 48～30℃.