The Optimization of Dilute Acid Hydrolysis of Cotton Stalk in Xylose Production

Levent, Okan
Bostanci, Seyda
Bakir, Ufuk
Yılmaz, Levent
Cotton stalk, a lignocellulosic waste material, is composed of xylose that can be used as a raw material for production of xylitol, a high-value product. There is a growing interest in the use of lignocellulosic wastes for conversion into various chemicals because of their low cost and the fact that they are renewable and abundant. The objective of the study was to determine the effects of H(2)SO(4) concentration, temperature, and reaction time on the production of sugars (xylose, glucose, and arabinose) and on the reaction by-products (furfural and acetic acid). Response surface methodology was used to optimize the hydrolysis process in order to obtain high xylose yield and selectivity. The optimum reaction temperature, reaction time, and acid concentration were 140 A degrees C, 15 min, and 6%, respectively. Under these conditions, xylose yield and selectivity were found to be 47.88% and 2.26 g g(-1), respectively.


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Lignocellulosic agricultural waste materials are produced in huge amounts in the world and regarded as abundant, inexpensive readily available natural sources for various industries. They are mainly composed of three types of macromolecules, cellulose, hemicellulose and lignin. Cellulose and hemicellulose are converted to a variety of valuable compounds such as enzymes, hormones, antibiotics, ethanol, sugar alcohols, organic acids and xylooligosaccharides (XOs) using bioprocessing methods easily after the r...
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Porous interconnected hydroxyapatite (HA) and HA/tricalcium phosphate (TCP) (60/40) ceramics are promising materials for hard tissue repair. However, the mechanical properties of these materials have not been accurately determined under weight-bearing conditions. In this study, newly developed HA and HA/TCP (60/40) ceramics were used with intramedullary fixation in segmental bone defects of rabbits. Early radiological, histological, densitometric and biomechanical changes were evaluated. The mean radiologic...
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Alginate is a natural biopolymer composed of mannuronic and guluronic acid monomers. It is produced by algae and some species of Azotobacter and Pseudomonas. This study aims to investigate the effect of dissolved oxygen tension (DOT) and growth medium substrate and calcium concentrations on the monomeric composition of alginate produced by Azotobacter vinelandii ATCCA (R) 9046 in a fermenter. Results showed that alginate production increased with increasing DOT from 1 to 5 %. The highest alginate production...
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Citation Formats
Ö. AKPINAR, O. Levent, S. Bostanci, U. Bakir, and L. Yılmaz, “The Optimization of Dilute Acid Hydrolysis of Cotton Stalk in Xylose Production,” APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY, pp. 313–325, 2011, Accessed: 00, 2020. [Online]. Available: