Abstract

Triterpenoid saponins and ginsenosides, the majority of which contain the aglycons protopanaxadiol or protopanaxatriol, are important biologically active compounds of Panax ginseng C. A. Meyer. The principal ginsenoside, the content of which in ginseng root is >20% of the total saponins, is Rb1 (1), which includes -sophorose and -gentiobiose residues (6-O-Dglucopyranosyl-D-glucose) in the C-3 and C-20 positions, respectively, of 20(S)-protopanaxadiol. The minor ginsenoside Rd (2) is a close structural analog of Rb1 and has a glucose instead of -gentiobiose in the C-20 position [1]. Rd has a broader spectrum of biological activity than Rb1, for example, it increases the differentiation of nerve stem cells, protects neurons from neurotoxic substances, and inhibits proliferation of HepG2 liver cancer cells [2]. However, the content of Rd in ginseng root is 4–5 times less than that of Rb1. Therefore, biotransformation of ginsenoside Rb1 into Rd, in particular by using microorganisms, is of practical importance [3].

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