Optimization of Microwave/Ultrasonic-Assisted Sulfuric Acid Hydrolysis of Corn Straw by Using Response Surface Methodology

doi:10.7506/spkx1002-6630-201614008

Abstract

Abstract:

In this study, we evaluated and compared the effectiveness of single and combined applications of microwave
and ultrasonic for enhancing the sulfuric acid hydrolysis of corn straw. It turned out that the combined use of microwave and
microwave was superior to either alone. Further, we optimized the microwave/ultrasonic hydrolysis process by using onefactor-
a-time method and response surface methodology. A quadratic regression model for predicting the yield of reducing
sugar as a function of 5 independent variables was formulated and validated. The marginal effect of the independent variables
studied and their interactions were tested. The optimal process conditions were obtained as follows: temperature, 82 ℃;
reaction time, 153 min; sulfuric acid concentration, 3.1%; solid/liquid ratio, 1:45 (g/mL); and microwave power, 634 W.
Under these conditions, the maximum yield of reducing sugar of 41.24% was obtained experimentally, which was in good
agreement with the model prediction, indicating that the model is feasible. A 6.6% increase was achieved as compared to that
obtained under the conditions: reaction time for 2 h at 120 ℃, a sulfuric acid concentration of 3%, and a solid/liquid ratio of
1:20 (g/mL). Ion chromatographic analysis revealed that the hydrolysate solution under the optimized conditions contained
1.75% arab sugar, 0.44% galactose, 15.65% glucose, 7.98% xylose, 15.34% fructose, and 0.09% cellobiose.

Key words: corn straw, microwave, ultrasound, reducing sugar, response surface methodology, ion chromatography

CLC Number:

X712

LI Wenjie, LI Hongfei, WANG Weihao, JIA Pengyu, KANG Lijun, KOU Fang, ZHANG Lili, YIN Jing, CAO Longkui. Optimization of Microwave/Ultrasonic-Assisted Sulfuric Acid Hydrolysis of Corn Straw by Using Response Surface Methodology[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201614008.

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