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Applied Biochemistry and Biotechnology

, Volume 186, Issue 1, pp 122–131 | Cite as

Enhanced Inulin Saccharification by Self-Produced Inulinase from a Newly Isolated Penicillium sp. and its Application in d-Lactic Acid Production

  • Zhaojuan Zheng
  • Qianqian Xu
  • Peng Liu
  • Fan Zhou
  • Jia Ouyang
Article
  • 164 Downloads

Abstract

In order to find an alternative for commercial inulinase, a strain XL01 identified as Penicillium sp. was screened for inulinase production. The broth after cultivated was centrifuged, filtered, and used as crude enzyme for the following saccharification. At pH 5.0 and 50 °C, the crude enzyme released 84.9 g/L fructose and 20.7 g/L glucose from 120 g/L inulin in 72 h. In addition, simultaneous saccharification and fermentation of chicory flour for d-lactic acid production was carried out using the self-produced crude inulinase and Lactobacillus bulgaricus CGMCC 1.6970. A high d-lactic acid titer and productivity of 122.0 g/L and 1.69 g/(L h) was achieved from 120 g/L chicory flour in 72 h. The simplicity for inulinase production and the high efficiency for d-lactic acid fermentation provide a perspective and profitable industrial biotechnology for utilization of the inulin-rich biomass.

Keywords

Inulinase Chicory flour Penicillium sp. d-Lactic acid Simultaneous saccharification and fermentation 

Notes

Acknowledgments

This study was supported by the National Natural Science Foundation of China (51776099, 31300487), the Key Research and Development Program of Jiangsu Province of China (BF2015007). The authors are also grateful to the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry UniversityNanjingPeople’s Republic of China
  2. 2.College of Chemical EngineeringNanjing Forestry UniversityNanjingPeople’s Republic of China
  3. 3.College of ForestryNanjing Forestry UniversityNanjingPeople’s Republic of China
  4. 4.Key Laboratory of Forest Genetics and Biotechnology of the Ministry of EducationNanjingPeople’s Republic of China

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