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Effects of Impurities in Alkali-Extracted Xylan on Its Enzymatic Hydrolysis to Produce Xylo-Oligosaccharides

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Abstract

As the second abundant natural carbohydrate, xylan is normally prepared through alkaline extraction and then used for xylo-oligosaccharides (XOS) production. However, the extracted xylan inevitably contains salt, ethanol, and pigment. In order to investigate the effects of these impurities on XOS production, the alkaline-extracted xylan with different kinds and concentrations of impurities was made and then hydrolyzed using alkaline xylanase (EC 3.2.1.8) to produce XOS. The results showed that a certain concentration of salt (NaCl) promoted the XOS production, while ethanol and pigment inhibited the enzymatic hydrolysis process significantly. The color value mainly ascribed to the phenolic compounds binding to xylan was a key restriction factor in the enzymatic hydrolysis later stage. Using optimal xylan sample (with 10 mg/mL NaCl, color value of 4.6 × 105, without ethanol) as substrate, the highest XOS yield of 58.58 % was obtained. As the substrate of XOS production, prepared xylan should contain colored materials and ethanol as less as possible, however, retains appropriate salt.

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Acknowledgments

This work was supported by the following foundations: National Natural Science Foundation of China (No. 21276259) and NSFC international (regional) cooperation and exchange project: the International Fund for Young Scientists (No. 21450110062).

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    Authors and Affiliations

    1. National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China

      Rui Shen, Hong-Qiang Li & Jian Xu

    2. Beijing University of Chemical Technology, Beijing, 100029, China

      Rui Shen & Jie Zhang

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    1. Rui Shen
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    2. Hong-Qiang Li
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    3. Jie Zhang
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    4. Jian Xu
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    Correspondence to Jian Xu.

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    Rui Shen and Hong-Qiang Li contributed equally to this work.

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    Shen, R., Li, HQ., Zhang, J. et al. Effects of Impurities in Alkali-Extracted Xylan on Its Enzymatic Hydrolysis to Produce Xylo-Oligosaccharides. Appl Biochem Biotechnol 179, 740–752 (2016). https://doi.org/10.1007/s12010-016-2028-5

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