Optimal Experimental Condition for Hemicellulosic Hydrolyzate Treatment with Activated Charcoal for Xylitol Production
- 5 September 2008
- journal article
- research article
- Published by Wiley in Biotechnology Progress
- Vol. 20 (1), 134-139
- https://doi.org/10.1021/bp034207i
Abstract
Rice straw was hydrolyzed into a mixture of sugars using diluted H(2)SO(4). During hydrolysis, a variety of inhibitors was also produced, including acetic acid, furfural, hydroxymethylfurfural, and lignin degradation products (several aromatic and phenolic compounds). To reduce the toxic compounds concentration in the hydrolyzate and to improve the xylitol yield and volumetric productivity, rice straw hemicellulosic hydrolyzate was treated with activated charcoal under different pH values, stirring rates, contact times, and temperatures, employing a 2(4) full-factorial design. Fermentative assays were conducted with treated hydrolyzates containing 90 g/L xylose. The results indicated that temperature, pH, and stirring rate strongly influenced the hydrolyzate treatment, temperature and pH interfering with all of the responses analyzed (removal of color and lignin degradation products, xylitol yield factor, and volumetric productivity). The combination of pH 2.0, 150 rpm, 45 degrees C, and 60 min was considered an optimal condition, providing significant removal rates of color (48.9%) and lignin degradation products (25.8%), as well as a xylitol production of 66 g/L, a volumetric productivity of 0.57 g/L.h, and a yield factor of 0.72 g/g.Keywords
This publication has 27 references indexed in Scilit:
- The influence of pH, temperature and hydrolyzate concentration on the removal of volatile and nonvolatile compounds from sugarcane bagasse hemicellulosic hydrolyzate treated with activated charcoal before or after vacuum evaporationBrazilian Journal of Chemical Engineering, 2001
- Bacterial Populations Colonizing and Degrading Rice Straw in Anoxic Paddy SoilApplied and Environmental Microbiology, 2001
- Fermentation of lignocellulosic hydrolysates. I: inhibition and detoxificationBioresource Technology, 2000
- Influence of emission from rice straw burning on bronchial asthma in childrenPediatrics International, 2000
- Production of granular activated carbons from select agricultural by-products and evaluation of their physical, chemical and adsorption properties1Louisiana Agricultural Experiment Station manuscript 99-21-0066.1Bioresource Technology, 2000
- Biotechnological production of xylitol. Part 3: Operation in culture media made from lignocellulose hydrolysatesBioresource Technology, 1998
- Improved xylitol production with Debaryomyces hansenii Y-7426 from raw or detoxified wood hydrolysatesEnzyme and Microbial Technology, 1997
- Xylitol recovery from fermented sugarcane bagasse hydrolyzateBioresource Technology, 1995
- Effect of acetic acid on xylose fermentation to xylitol by Candida guilliermondiiJournal of Basic Microbiology, 1995
- Utilization of sugar cane bagasse hemicellulosic hydrolysate by pichia stipitis for the production of ethanolProcess Biochemistry, 1991