Hydrolysis of Corncob Hemicellulose by Solid Acid Sulfated Zirconia and Its Evaluation in Xylitol Production
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Hydrolysis of Corncob Hemicellulose by Solid Acid Sulfated Zirconia and Its Evaluation in Xylitol Production Lijun Wan 1 & Zhen Gao 1 & Bin Wu 1 & Fei Cao 1 & Min Jiang 1 & Ping Wei 1 & Honghua Jia 1 Received: 7 June 2020 / Accepted: 12 August 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
Corncob is an abundant agricultural residue containing high content of hemicellulose. In this paper, the hemicellulosic hydrolysate was prepared from the hydrolysis of corncob using the solid acid sulfated zirconia as a catalyst. According to response surface analysis experiments, the optimum conditions for preparing hemicellulosic hydrolysate catalyzed by sulfated zirconia were determined as follows: solid (sulfated zirconia)–solid (corncob) ratio was 0.33, solid (corncob)–liquid (water) ratio was 0.09, temperature was 153 °C, and time was 5.3 h. Under the optimized conditions, the soluble sugar concentration was 30.12 g/L with a yield of 033 g/g corncob. Subsequently, xylitol production from the resulting hemicellulosic hydrolysate was demonstrated by Candida tropicalis, and results showed that the yield of xylitol from the hemicellulosic hydrolysate could be significantly improved on a basis of decolorization and detoxification before fermentation. The maximum yield of xylitol from the hemicellulosic hydrolysate fermented by C. tropicalis was 0.76 g/g. This study provides a new attempt for xylitol production from the hemicellulosic hydrolysate. Keywords Corncob . Hemicellose . Sulfated zirconia . Hemicellulosic hydrolysate . Xylitol
Introduction Lignocellulose is the main component of crop residues which is considered as one of the most promising renewable biomass. For example, hemicellulose accounts for around 40% of corncob, which is an important residue in the corn processing industry [1]. Hemicellulose has been used in the production of pig feed, adhesives, and insulating materials [2, 3]. In Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12010-02003412-9) contains supplementary material, which is available to authorized users.
* Honghua Jia [email protected] Extended author information available on the last page of the article
Applied Biochemistry and Biotechnology
particular, hemicellulose is usually hydrolyzed to hemicellulosic hydrolysate containing xylose, which is used as industrial raw materials [4]. At present, the methods for hydrolyzing hemicellulose into hemicellulosic hydrolysate include acid method, alkali method, and enzymatic method. Compared with the other methods, the hydrolysis rate of hemicellulose by acid method is as high as 80–90% and the cost is relatively low. Therefore, the acid method has been usually applied for hemicellulose hydrolysis because of its simple operation [5]. However, the acid method must consume a large amount of alkali to neutralize the hydrolysate. Solid acid needs no neutralization and is easy to be separated and reused, which is an ideal green substitute for liquid acids. A solid acid
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