DETOXIFICATION OF HEMICELLULOSIC HYDROLYSATE OF CORN COB FOR XYLITOL PRODUCTION BY CANDIDA TROPICALIS AS2.1776
The detoxification of hemicellulosic hydrolysate of corncob was studied for the purpose of xylitol fermentation by Candida tropicalis As2.1776. Corncob was hydrolyzed into a mixture of sugars using diluted H2SO4. As by products, the toxic compounds including acetic acid, furfural and lignin degradation generated during hydrolysis, which would affect the fermentation greatly. Among these compounds, furfural was removed by volatilization at the concentration procedure under vacuum. Activated charcoal and anionic exchange resin 201×4 were employed to adsorb the other toxic compounds. The results showed that activated charcoal gave excellent adsorption selectivity on lignin degradation while the resin could remove most of acetic acid and part of lignin degradation. However, the hydrolysate adsorbed only by activated charcoal resulted in no xylitol accumulation, and hydrolysate adsorbed only by the resin resulted in very slowly consumption of sugars. When the detoxification procedure of adsorption by activated charcoal and subsequently by the resin was conducted, 60.1％ acetic acid and 94.2％ lignin degradation were removed. 100％ xylose was consumed and 66.76 g/L xylitol was accumulated after 120 h fermentation, which equaled to attaining a yield of 0.66 g xylitol/g consumed xylose and a volumetric productivity of0.56g/Lh.
detoxification corncob activated charcoal anionic exchange resin xylitol
Lihong Deng Shanzheng Wen Yan Yang Jianxin Jiang
College of Material Science & Technology, Beijing Forest University, Beijing, 100083, China
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
928-931
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）