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Vol. 25 No. 5 (2013): Vol 25 Issue 5

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Impacts of the Combined Pretreatment Using NaOH and Ozone on Enzymatic Hydrolysis and Morphology of Rice Straw

H.Y. Li
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China ; College of Science, Hunan Agricultural University, Changsha 410128, P.R. China
M. Jin
College of Science, Hunan Agricultural University, Changsha 410128, P.R. China
K.L. Huang
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China
Z.G. Li
College of Science, Hunan Agricultural University, Changsha 410128, P.R. China
S.Q. Liu
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China
Y.N. Liu
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China
X.W. Wu
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China ; College of Science, Hunan Agricultural University, Changsha 410128, P.R. China

Corresponding Author(s) : H.Y. Li

lhy5321@hunau.net

Asian Journal of Chemistry, Vol. 25 No. 5 (2013): Vol 25 Issue 5

Abstract

The combined pretreatment of rice straw using NaOH and ozone followed by enzymatic hydrolysis was investigated in comparison with NaOH pretreatment. In order to measure the composition variance, the surface morphology of rice straw was investigated by the scanning electron microscopy. The combined pretreatment of rice straw increased the specific surface area and total pore volume, which could degrade the lignin polymer, solubilize hemicellulose and neutral detergent solubles. During the combined pretreatment of rice straw using NaOH and ozone, no measurable quantity of furfural and hydroxymethyl furfural has been detected. These chemical and morphological changes of rice straw lead to the increased access of cellulase to rice straw surface and the enhanced susceptibility to enzymatic hydrolysis. The conversed percentage of cellulose and hemicelluloses presented in combined pretreated rice straw is 92.6 %, while those of NaOH pretreated and untreated rice straw are 73.8 % and 52.5 %, respectively.

Keywords

Rice straw Ozone Pretreatment Enzymatic hydrolysis Morphology
Li, H., Jin, M., Huang, K., Li, Z., Liu, S., Liu, Y., & Wu, X. (2012). Impacts of the Combined Pretreatment Using NaOH and Ozone on Enzymatic Hydrolysis and Morphology of Rice Straw. Asian Journal of Chemistry, 25(5), 2816–2820. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/25_5_103
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