Summary

Ginsenoside-Rk₁ and Ginsenoside-Rg₅ from Processed Vietnamese Ginseng

Steaming process has been shown to change chemical compositions of Vietnamese ginseng (VG) Panax vietnamensis by reducing the content of polar ginsenosides, such as ginsenosides-Rb₁, -Rc, -Rd, -Re, and -Rg₁, but increasing the content of less polar ginsenosides. This continuing work aimed to isolate and demonstrate newly formed saponins in Vietnamese ginseng after steaming process. As a result, seven dammarane-type triterpenoid saponins were isolated and structurally elucidated by spectroscopic analyses including MS and NMR. For the first time, newly formed ginsenoside-Rk₁ and ginsenoside-Rg₅ were found in processed VG.  In addition, 5 ocotillol saponins were isolated with a simple method from processed VG.

Keywords: Processed Vietnamese ginseng, Panax vietnamensis, Ocotillol, Ginsenoside-Rk₁, Ginsenoside-Rg_5.

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