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Under ultrasonication, the ginkgo terpene trilactones, ginkgolides and bilobalide, in ginkgo extracts can be selectively dissolved in 10% aqueous NaH 2 PO 4 solution at a temperature of 50-60 o C and separated from the solution by extraction with a mixture of ethyl acetate/tetrahydrofuran in a capped vial. After derivatization, these terpene trilactones can be quantified using...
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