Abstract
Rb1 and Rg1 are the major ginsenosides in protopanaxadiol and protopanaxatriol. Their content in ginsenosides was 23.8 and 17.6%, respectively. A total of 22 isolates of β-glucosidase producing microorganisms were isolated from the soil of a ginseng field using Esculin-R2A agar. Among these isolates, the strain GH21 showed the strongest activities to convert ginsenoside Rb1 and Rg1 to minor ginsenosides compound-K and F1, respectively. Ginsenosides Rb1 and Rg1 bioconversion rates were 74.2 and 89.3%, respectively. Meanwhile, the results demonstrated that the ginsenoside Rg1 could change the biotransformation pathway of ginsenoside Rb1 by inhibiting the formation of the intermediate metabolite gypenoside-XVII. GH21 was identified as a Cladosporium cladosporioides species based on the internal transcribed spacers (ITS) ITS1-5.8S-ITS2 rRNA gene sequences constructed phylogenetic trees.
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This work was supported by the National Natural Science Foundation of China (No.20862017) and National Ginseng Products Quality Supervision Inspection Center.
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Wu, L., Jin, Y., Yin, C. et al. Co-transformation of Panax major ginsenosides Rb1 and Rg1 to minor ginsenosides C–K and F1 by Cladosporium cladosporioides . J Ind Microbiol Biotechnol 39, 521–527 (2012). https://doi.org/10.1007/s10295-011-1058-9
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DOI: https://doi.org/10.1007/s10295-011-1058-9