Biotransformation of ginsenoside Rc to Rd by endophytic bacterium Bacillus sp. G9y isolated from Panax quinquefolius

Abstract

To isolate endophytic bacterium with the ability to specifically convert ginsenoside Rc from Panax quinquefolius. An endophytic bacterium G9y was isolated from Panax quinquefolius and indentified as Bacillus sp. based on 16s rDNA gene sequence. Ginsenoside Rc was effectively converted to Rd by G9y, which was confirmed by thin-layer chromatography and high performance liquid chromatography (HPLC) analysis. The biotransformation conditions were further optimized as follows: inoculum amount 5%, converting temperature 45 °C, medium beef extract peptone broth at pH of 7, and the time of Rc addition was 4 h after bacterium G9y growth, under which ginsenoside Rc was completely converted to Rd by bacterium G9y within 25 h after inoculation. A strain of G9y with the ability to convert ginsenoside Rc into Rd was screened from endophytic bacteria isolated from P. quinquefolius. The results provide a new microbial resource for preparing ginsenoside Rd via biotransformation, and explore a pathway for Rc utilization, which has great potential application value.

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Acknowledgements

This research was financially supported by the Henan Provincial Department of Education Fund (19A180031).

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DZ designed experiments; CZ carried out experiments and wrote the manuscript; YX analyzed experimental results; MG and ZL assisted with high performance liquid chromatography (HPLC) analysis; JZ and QZ inspection experiments.

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Correspondence to Daheng Zhu.

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Zhang, C., Xu, Y., Gu, M. et al. Biotransformation of ginsenoside Rc to Rd by endophytic bacterium Bacillus sp. G9y isolated from Panax quinquefolius. Antonie van Leeuwenhoek (2021). https://doi.org/10.1007/s10482-021-01529-3

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Keywords

  • Ginsenoside Rc
  • Ginsenoside Rd
  • Biotransformation
  • Panax quinquefolius