Four minor components, along with the major cyanogenic glycosides, amygdalin and prunasin, were isolated from Prunus persica seeds (Persicae Semen; Tounin), and characterized as mandelic acid glycosides (β-gentiobioside and β-D-glucoside) and benzyl alcohol glycosides (β-gentiobioside and β-D-glucoside). The anti-tumor promoting activity of these compounds was examined in both in vitro and in vivo assays. All of the compounds significantly inhibited the Epstein-Barr virus early antigen activation induced by tumor promoter. In addition, they produced a delay of two-stage carcinogenesis on mouse skin that was comparable in potency to (−)-epigallocatechin gallate from green tea. Structure–activity relationships indicated that a substituent at the benzylic position with glycosidic linkage affected the in vitro and in vivo activities with an order of enhancing potency, CN<COOH<H.
2003 The Pharmaceutical Society of Japan