Jm. Dominguez et al., DILUTE-ACID HEMICELLULOSE HYDROLYSATES FROM CORN COBS FOR XYLITOL PRODUCTION BY YEAST, Bioresource technology, 61(1), 1997, pp. 85-90
Citations number
17
Categorie Soggetti
Energy & Fuels","Biothechnology & Applied Migrobiology",Agriculture
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 al
so obtained after the corn cobs were treated with 10% ammonium hydroxi
de at 26 degrees C for 24 h. Neutralized hydrolysates containing ca. 1
30 g/l xylose were used as the substrate for xylitol production by a x
ylitol-producing yeast Candida sp. 11-2. Ammonia-treated hydrolysate w
as a better substrate for xylitol production. Xylose was consumed with
in 36 h with a specific xylitol productivity of 1.94 g/l.h and a xylit
ol weight yield of 0.57 g/g xylose utilized. In contrast, neutralized
hemicellulose hydrolysate obtained without prior ammonia treatment req
uired anion exchange resin treatment to be fermented by yeasts. The sp
ecific productivity and weight yield of xylitol from anion exchange re
sin-treated hydrolysate were comparable to that from an ammonia-treate
d sample. (C) 1997 Published by Elsevier Science Ltd.