The invention relates to the field of
microorganism, in particular to a method for preparing
ginsenoside Rh2. The method comprises the following steps: taking activated
lactobacillus delbrueckii subsp bulgaricus to inoculate MRS (magnetic
resonance spectrum) culture medium, adding total
ginsenoside; fermenting for 240-248 hours at 37-39 DEG C; collecting
fermentation liquor and
saponin-glycosidases for reacting at 240-360 hours at 88-92 DEG C; collecting reaction solution for
filtration, absorbing the filtrate by using microporous resin and then eluting the absorbed filtrate to by 70 percent
ethanol; extracting with 95 percent
ethanol; and then filtering, and
drying the filtrate to obtain the
ginsenoside Rh2. The preparation method is simple to operate, mild for
reaction conditions, utilizes the
lactobacillus delbrueckii subsp bulgaricus to conduct
biotransformation on the total ginsenoside, and
saponin-glycosidases to prepare the ginsenoside Rh2, thus being high in transformation rate, being used for preparing a large amount of ginsenoside Rh2, and further realizing the industrialization of the ginsenoside Rh2.