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An efficient strategy to improve enzymatic hydrolysis of naked oat straw pretreated by Irpex lacteus

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Abstract

The objective of this study was aiming at developing an efficient strategy to promote enzymatic hydrolysis of naked oat straw and deciphering the potential mechanism. Irpex lacteus and Phlebia acerina were employed to inoculated on the naked oat straw for 4 weeks which the changes of fiber components, fermentation losses, lignin-degrading enzymes production pattern were determined weekly. Furthermore, the 72 h enzymatic hydrolysis of ultimately fermented naked oat straw were also evaluated. The acid detergent lignin was degraded at about 25% along with the moderate dry matter and cellulose loss which both showed selective degradation. The lignin-degrading enzymes production patterns of the two fungi were different which lignin peroxidase was not detected in Irpex lacteus treatment. In addition, the activities of cellulolytic enzymes were higher in Phlebia acerina treatment. After 72 h enzymatic hydrolysis, the reducing sugar content and hydrolysis yield pretreated by Irpex lacteus was 12.92 g/L and 69.49%, respectively. It was much higher than that in sterilized substrate and Phlebia acerina treatment. Meanwhile, the hydrolysis yields of glucose, sum of xylose and arabinose were all improved by Irpex lacteus which were 30.96% and 25.62%, respectively, and showed significant enhancements compared to control and Phlebia acerina treatment. Irpex lacteus is one of effective white rot fungi which could promote the enzymatic hydrolysis of naked oat straw obviously.

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All relevant data generated during this study are included in the article.

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Acknowledgements

This research was supported by the National Modern Agricultural Industry Technology System of the People’s Republic of China (No. CARS-07-E-3).

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Authors and Affiliations

  1. College of Engineering, China Agricultural University, No. 17 Qinghua Donglu, Haidian District, Beijing, 100083, China

    Menghu Zheng, Rongrong Li, Yan Wang & Chuncheng Xu

  2. College of Grassland Science and Technology, China Agricultural University, Beijing, 100093, China

    Fuyu Yang

Authors
  1. Menghu Zheng
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  2. Rongrong Li
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  3. Yan Wang
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  4. Fuyu Yang
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  5. Chuncheng Xu
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Contributions

All authors contributed to the study conception and design. CX conceived and designed research. MZ conducted experiments, analyzed data, and wrote the manuscript. RL, YW, and MZ participate in the preparation of the experimental materials. CX and FY were involved in the revision of the manuscript. All authors read and approved the manuscript.

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Correspondence to Chuncheng Xu.

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Zheng, M., Li, R., Wang, Y. et al. An efficient strategy to improve enzymatic hydrolysis of naked oat straw pretreated by Irpex lacteus. Bioprocess Biosyst Eng 45, 227–236 (2022). https://doi.org/10.1007/s00449-021-02652-1

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