Effect of inoculum level of xylitol production from rice straw hemicellulose hydrolysate by Candida guilliermondii.
The effect of inoculum level on xylitol production by Candida guilliermondii was evaluated in a rice straw hemicellulose hydrolysate. High initial cell density did not show a positive effect in this bioconversion since increasing the initial cell density from 0.67 g L-1 to 2.41 g L-1 decreased both the rate of xylose utilization and xylitol accumulation. The maximum xylitol yield (0.71 g g-1) and volumetric productivity (0.56 g L-1 h-1) were reached with an inoculum level of 0.9 g L-1. These results show that under appropriate inoculum conditions rice straw hemicellulose hydrolysate can be converted into xylitol by the yeast C. guilliermondii with efficiency values as high as 77% of the theoretical maximum.
Roberto
I C
IC
Department of Biotechnology, Faculty of Chemical Engineering of Lorena, SP, Brazil.
Sato
S
S
de Mancilha
I M
IM
D002175:Candida / Q000254:growth & development* / Q000378:metabolism*; D015169:Colony Count, Microbial; D003470:Culture Media / Q000378:metabolism*; D005285:Fermentation; D006868:Hydrolysis; D012275:Oryza / Q000378:metabolism*; D011134:Polysaccharides / Q000378:metabolism*; D014993:Xylitol / Q000096:biosynthesis*
D003470:Culture Media; D011134:Polysaccharides; C007916:hemicellulose; D014993:Xylitol