[Study on xylose fermentation by Neurospora crassa].
The influence of oxygen limitation and medium initial pH on xylose fermentation by Neurospora crassa AS 3.1602 was investigated. N. crassa AS 3.1602 has high ability of xylose fermentation producing ethanol and xylitol. Oxygen limitation has big influence on ethanol and xylitol production. The maximum conversion rate of ethanol was 63.2% obtained under semi-aerobic conditions. The maximum conversion rate of xylitol was 31.8% obtained under micro-aerobic conditions. Xylitol accumulation is behind the accumulation of ethanol. The optimal pH is 5.0 for ethanol fermentation, and 4.0 for xylitol fermentation, respectively. Xylose fermentation is greatly inhibited at high pH. The yields of ethanol and xylitol are greatly influenced by the initial concentration of xylose. The addition of glucose inhibits both the xylose utilization and the ethanol and xylitol production.
Zhang
Xiao
X
State Key Laboratory of Microbial Technology, Shandong University, Jinan 250100, China. zhangxiao@life.sdu.edu.cn
Zhu
Dongqing
D
Wang
Dan
D
Lin
Jianqiang
J
Qu
Yinbo
Y
Yu
Shiyuan
S
D003470:Culture Media / Q000737:chemistry / Q000378:metabolism; D000431:Ethanol / Q000378:metabolism; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D009492:Neurospora crassa / Q000737:chemistry / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D014993:Xylitol / Q000378:metabolism; D014994:Xylose / Q000378:metabolism*
D003470:Culture Media; D000431:Ethanol; D014994:Xylose; D010100:Oxygen; D014993:Xylitol