Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (9): 1534-1546.DOI: 10.1016/S1872-2067(14)60134-0

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Biotransformation of geniposide in Gardenia jasminoides to genipin by Trichoderma harzianum CGMCC 2979

Yuesheng Donga, Leping Liua, Yongming Baoa, Aiyu Haob, Ying Qina, Zujia Wena, Zhilong Xiua   

  1. a School of Life Science and Biotechnology, Dalian University of Technology, Dalian 116024, Liaoning, China;
    b Dalian Institute for Drug Control, Dalian 116021, Liaoning, China
  • Received:2014-02-14 Revised:2014-04-04 Online:2014-08-19 Published:2014-08-22
  • Supported by:

    This work was Supported by the National Natural Science Foundation of China (81172966), the National Basic Research Program of China (973 Program, 2009CB724706), and the Fundamental Research Funds for the Central Universities (DUT12ZD209).

Abstract:

Trichoderma harzianum (T. harzianum) CGMCC 2979 was used to transform the geniposide in Gardenia jasminoides (G. jasminoides) to genipin, dispensing the use of purified enzyme and the extraction of geniposide from the raw material. At 30 ℃, pH 6.1, and an initial G. jasminoides concentration of 80 g dried fruit per liter of medium, the geniposide-to-genipin conversion rate reached 97.8% after 48 h of fermentation. The genipin was purified from the fermentation broth by a combined method of XAD-16N-resin and silica-gel chromatography, yielding a total recovery of 62.3%. A 74.4-kDa geniposide-β-glucosidase implicated in the transformation of geniposide to genipin was purified from T. harzianum CGMCC 2979. It had optimum activity at 50 ℃ and pH 4.0-5.0. The Km and Vmax of the enzyme for geniposide were 3.6 mmol/L and 775 μmol/h/mg protein, respectively. The simple, direct, and efficient biotransformation of geniposide in G. jasminoide to genipin by T. harzianum CGMCC 2979 that is described in this study could represent an alternative and effective method for producing genipin.

Key words: Geniposide, Genipin, Trichoderma harzianum, Biotransformation, Geniposide-β-glucosidase, Purification