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• Preparation

  Weigh 500g of pulverized Centella asiatica powder, soak it in 2500ml of 75% ethanol aqueous solution, and extract it ultrasonically four times at 50℃ for one hour each time. Filter the extract, combine the filtrates, and concentrate under reduced pressure to obtain 20.5g of extract. Dissolve the extract in 200ml of water, and extract it three times with an equal volume of petroleum ether. Extract the lower phase aqueous solution four times with an equal volume of ethyl acetate, and collect the lower phase aqueous solution. Extract it three times with an equal volume of n-butanol and ethyl acetate mixed solvent (1:1 volume ratio) from the collected lower phase aqueous solution. Combine the upper phase extracts, decolorize the extract with activated carbon, and concentrate the decolorized extract under reduced pressure to obtain 7.3g of total Asiaticoside. Dissolve the total Asiaticoside in 10 times the volume of methanol, filter, concentrate the filtrate, and recrystallize it with 90% ethanol aqueous solution at room temperature to obtain 3.3g of high-purity Asiaticoside with a purity of 90% and a yield of 0.66%.;

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