Bu Gu Zhi

Fructus Psoraleae (Buguzhi) Malaytea Scurfpea Fruit Malaytea Scurfpea Fruit is the dried ripe fruit of Psoralea corylifolia L. (Fam. Leguminosae). The infructescence is collected in autumn when the fruit is ripe, dried in the sun, and the fruit is gathered, removed from foreign matter. Description Reniform, slightly flattened, 3-5 mm long, 2-4 mm wide, about 1.5 mm thick. Externally black, blackish-brown or greyish-brown, with finely reticulate wrinkes. Apex obtuse-rounded, with a small prominence and the depressed end showing a scar of fruit stalk. Texture hard. Pericarp thin, uneasily stripped from seed; seed 1, cotyledons 2, yellowish-white, oily. Odour, aromatic; taste, pungent and slightly bitter. Identification To 0.5 g of the powder add 20 ml of ethyl acetate, ultrasonicate for 15 minutes, filter. Evaporate the filtrate to dryness, dissolve the residue in 1 ml of ethyl acetate as the test solution. Dissolve psoralen CRS and isopsoralen CRS in ethyl acetate to produce a solution