Title: Z.M. Qian, et al. Simultaneous determination of nucleobases, nucleosides and saponins in Panax notoginseng using multiple columns high performance liquid chromatography. Journal of Pharmaceutical and Biomedical Analysis 48 (2008) 1361-1367.
Title: Tohda C, et al. Abeta(25-35)-induced memory impairment, axonal atrophy, and synaptic loss are ameliorated by M1, A metabolite of protopanaxadiol-type saponins. Neuropsychopharmacology. 2004 May;29(5):860-8.