Dilute acid hemicellulose hydrolysates from corn cobs for xylitol production by yeast
1997
Dominguez, J.M. | Cao, N. | Gong, C.S. | Tsao, G.T.
Dilute acid hemicellulose hydrolysate, comprised mainly of xylose, was obtained from ground corn cobs after dilute hydrochloric acid (2%, wt) hydrolysis at 100 degrees C for 2 h. Similar acid hydrolysate was also obtained after the corn cobs were treated with 100 degrees C ammonium hydroxide at 26 degrees C for 24 h. Neutralized hydrolysates containing cat 130 g/l xylose were used as the substrate for xylitol production by a xylitol-producing yeast, Candida sp. 11-2. Ammonia-treated hydrolysate was a better substrate for xylitol production. Xylose was consumed within 36 h with a specific xylitol productivity of 1.94g/l.h and a xylitol weight yield of 0.57 g/g xylose utilized. In contrast, neutralized hemicellulose hydrolysate obtained without prior ammonia treatment required anion exchange resin treatment to be fermented by yeasts. The specific productivity and weight yield of xylitol from anion exchange resin-treated hydrolysate were comparable to that from an ammonia-treated sample.
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