药典英文版节选.docVIP

Radix Astragali (黄芪, Huangqi) Milkvetch Root MiIkvetch Root is the dried root of Astragalus membranaceus (Fisch. ) Bge. var. mongholicus (Bge. ) Hsiao or Astragalus membranaceus (Fisch. ) Bge. (Fam. Leguminosae). The drug is collected in spring or autumn, removed from rootlet and root stock, dried in the sun. Description Cylindrical, some branched, upper part relatively thick, 30--90 cm long, 1--3. 5 cm in diameter. Externally pale brownish-yellow or pale brown, with irregular, longitudinal wrinkles or furrows. Texture hard and tenacious, uneasi1y broken, fracture highly fibrous and starchy, bark yellowish-white, wood pale yellow, with radiate striations and fissures, the centre part of old root occasionally rotten-wood--shaped, blackish-brown or hollowed. Odour, weak; taste, slightly sweet and slightly bean-like on chewing. Identification (1) Transverse section: Cork consisting of many rows of cells. Phel1oderm of 3--5 rows of collenchymatous cells. Outer part of phloem rays often curved and fissured; fibres in bundles, walls thickened and lignified or slightly lignified, arranged alternately with sieve tube groups; stone cells sometimes visible near phe1loderm. Cambium in a ring. Xylem vessels scattered singly or 2--3 aggregated in groups; wood fibres existing among vessels; sometimes stone cells visible in rays, singly or 2--4 1n groups. Parenchymatous cells containing starch granules. Powder: Yellowish-white. Fibres in bundles or scattered, 8—30 um in diameter, thick-walled, with Longitudinal fissures on the surface, the primary walls often separated from the secondary walls, both ends often broken to tassel- like, or slightly truncated. Bordered--pitted vessels colourless or orange, bordered pits arranged c1osely. Stone cells occasionally visible, rounded, oblong or irregular, slightly thick-walled. (2) To 3 g of the powder add 20 ml of methanol and heat under reflux on a water bath for 1 hour and filter. Apply the filtrate to a prepared neutral alumini