An optimized microwave-assisted extraction method for increasing yields of rare ginsenosides from Panax quinquefoliusL.

Rare ginsenosides in Panax quinquefoliusL. have strong bioactivities. The fact that it is hard to obtain large amounts of rare ginsenosides seriously restricts further research on these compounds. An easy, fast, and efficient method to obtain different kinds of rare ginsenosides simultaneously and to quantify each one precisely is urgently needed.