摘要
研究了氧对休哈塔假丝酵母Ｒ的戊糖酒精发酵的影响。休哈塔假丝酵母Ｒ的戊糖酒精发酵需在“限制性供氧”条件下进行，溶解氧浓度在０９～１１ｍｇ／Ｌ时，木糖利用率和酒精得率分别为８３８％～９３５％和８８４％～９１２％；在１５Ｌ发酵罐中发酵富含戊糖的亚硫酸盐制浆废液３２ｈ，糖利用率和酒精得率分别达９２５％和８５０％，酵母细胞吸氧速率为１２４～１．４８ｍｍｏｌ／Ｌ·ｈ，溶氧系数ＫＬａ值１４７５～１８００ｈ－１；当通风量为４ｍ３／ｈ时，在５ｍ３发酵罐中发酵还原物为２２９０ｇ／Ｌ的亚硫酸盐制浆废液２２ｈ，还原物降至５９ｇ／Ｌ，醪液酒精浓度达０７４％（ｖ／ｖ），通风量过高或过低均导致酒精得率的下降。
Oxygen has a large effect on pentose fermentation by Candida shehatae. An “oxygenlimited” condition is required for pentose fermentation by Candida shehatae R with 83.8 %～93.5 % xylose consumption and 88.4 %～91 2 % ethanol yield, when dissolved oxygen is controlled between 0.9～1.1 mg/L. Sugar consumption and ethanol yield were 92.5 % and 85.0 %, respectively, when pentose rich spent sulfite liquor (SSL) was fermented in a 1.5 L fermentor, the oxygen absorption rate of cells was 1.24～1.48 mmol/L·h and the dissolved oxygen coefficient (K La) was 147.5～180 h -1 . The reducing substances were decreased from 22.90 g/L to 5.90 g/L in SSL and ethanol concentration was 0.74 %(v/v) after 22 h fermentation at air rate 4 m 3/h. To raise or reduce the air rate will decrease the ethanol yield.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
1998年第4期49-53,共5页
Chemistry and Industry of Forest Products
