Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (8): 20220134.doi: 10.7503/cjcu20220134

• Organic Chemistry • Previous Articles     Next Articles

Bio-chemical Synthesis of Melanin Precursor—— 5,6-Dihydroxyindole(DHI)

JIN Ruiming1,2, MU Xiaoqing1,2(), XU Yan1   

  1. 1.Lab of Brewing Microbiology and Applied Enzymology,School of Biotechnology,Jiangnan University,Wuxi 214122,China
    2.Jiangnan University Institute of Industrial Technology,Suqian 223800,China
  • Received:2022-03-03 Online:2022-08-10 Published:2022-04-06
  • Contact: MU Xiaoqing E-mail:xqmu@jiangnan.edu.cn
  • Supported by:
    the National Key Research and Development Program of China(2021YFC2100100);the National Natural Science Foundation of China(21336009);the Program of Introducing Talents of Discipline to Universities, China(111-2-06)

Abstract:

In this study, the biological oxidation step for the synthesis of dopachrome(DC) from L-3,4-dihydroxyphenylalanine(L-Dopa) catalyzed by Saccharomyces cerevisiae BY4741/pYX212-TYR and the chemical step for the reductive synthesis of 5,6-dihydroxyindole(DHI) from DC were coupled, realizing the bio-chemical synthesis of DHI. By optimizing the reaction conditions and the oxygen supply strategy of the biological oxidation step, the conversion rate of L-Dopa increased to 94.75%; by optimizing the reaction conditions and chemical additives of the chemical reduction step, the yield of DHI increased to 90.03%. Ultra high performance liquid chromatography tandem quadrupole time of flight mass spectroscopy(UPLC-Q-TOF-MS) identification for the products showed that DHI-soluble oligomers existed in the reaction system.

Key words: 5, 6-Dihydroxyindole, Tyrosinase, L-3, 4-Dihydroxyphenylalanine, Dopachrome, Bio-chemical synthesis pathway

CLC Number: 

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