Xiaotongcao
1、 Pharmacopoeia standard of xiaotongcao       This product is the dried stem pith of Stachyurus Himalai cus hook.f.et thoms., Stachyurus chinensis franch., or Helwingia japonica (thunb.) dietr., a plant of Cornaceae. In autumn, cut the stem, cut it into segments, take out the pith while fresh, straighten it, and dry it in the sun.
      . The surface is white or light yellow without texture. It is light, soft, flexible, easy to break, and has a flat section without hollow, showing silver white luster. It feels sticky and slippery after water immersion. The air is weak and the taste is light.
      There are light longitudinal stripes on the surface of green pod leaves. The quality is hard, and it is not easy to deform when pinched. No sticky and slippery feeling after water immersion.
      [identification] cross section of this product: the stigmas are thin-walled cells, quasi round, oval or polygonal, with sparse pits; There are mucus cells scattered. .
      The thin-walled cells of green pod leaves have obvious pits, containing colorless droplets, a few calcium oxalate clusters, and no mucus cells.
      Decoction pieces
      [processing] remove impurities and cut into sections.
      . Return to lung and stomach channels.
      [functions and indications] heat clearing, diuresis, lower breast. It is used for urination, gonorrhea, and milk retention.
      [usage and dosage] 3 ～ 6G.
      [storage] put it in a dry place.


2、 Chemical constituents of Herba Artemisiae
The stem pulp contains ash, fat, protein, crude fiber, pentosan and uronic acid, as well as a-galactose, glucose and xylose, galacturonic acid, a variety of amino acids and 18 trace elements such as calcium, barium, magnesium and iron.

3、 Pharmacological effects of xiaotongcao
The polysaccharide content of this product is high, and low dosage can reduce the content of lipid peroxide products (LPO) in the liver and serum of 9-month-old mice. Among them, the four polysaccharides significantly reduced the LPO content in the liver at the dosage of 80 mg / kg (p< 0.05), but significantly reduced the LPO content in the serum at the dosage of 160 mg / kg (p< 0.05). It can significantly reduce the content of aging metabolite LF in mouse myocardium and brain tissue (p< 0.01), but it has no obvious effect on the reduction of LF content in liver p> ; All of them could significantly increase the activity of SOD, an enzyme related to aging in whole blood of mice (p< 0.05).