e-ISSN 2231-8542
ISSN 1511-3701
Mohamad, N.L., Mustapa Kamal, S.M. and Abdullah, A.G.L.
Pertanika Journal of Tropical Agricultural Science, Volume 19, Issue 2, July 2011
Keywords: Overliming, sago trunk, dilute acid hydrolysis, xylose, xylitol
Published on:
Xylitol can be obtained from lignocellulosic materials containing xylose. However, the fraction of lignocellulose converted through dilute acid hydrolysis contains compounds that inhibit the fermenting micro-organisms. These inhibitors can be removed from the hydrolysate by detoxification method, prior to fermentation. This study describes effectiveness of overliming process to reduce the toxicity of hydrolysates generated from pre-treatment of sago trunk for xylitol production. The overliming pH 9 and 10 was studied and the results showed that pH 9 was showed 20% of sugar loss, which is low compared to pH 10. Candida tropicalis strain was used to evaluate the fermentability of overlimed sago trunk hydrolysate at pH 9 and non-overlimed hydrolysate medium. Meanwhile, Xylitol accumulation and productivity in the overlimed medium was found to be higher than the non-treated medium. The maximum production of xylitol was increased up to 74% and converted within 76 h. The results obtained improved the fermentation process when compared with the non-treated medium.
ISSN 1511-3701
e-ISSN 2231-8542