Pseudostellaria heterophylla
1、 Pharmacopoeia standard of Radix Pseudostellariae       This product is the dried root of Pseudostellaria heterophylla (miq.) Pax ex Pax et hoffm., a plant of the Caryophyllaceae family. When most of the stems and leaves wither in summer, they are dug, washed, fibrous roots removed, and placed in boiling water to be slightly scalded and then dried or directly dried.
      [properties] the product is slender spindle shaped or slender strip, slightly curved, 3-10cm long, 0.2-0.6cm in diameter. The surface is grayish yellow to yellowish brown, relatively smooth, with slight longitudinal wrinkles, and there are fibrous root marks in the depression. There are stem marks on the top. It is hard and brittle, with flat section, yellowish brown around, yellowish white in the center, and horny like. The air is slight, and the taste is slightly sweet.
      . The inner layer of the plug is thin, with only a few rows of parenchymal cells and tangential extension. The phloem is narrow and the rays are broad. The cambium forms a ring. The xylem accounts for the majority of the root, the vessels are sparsely arranged in a radial shape, and the primary xylem is 3-4 prototypes. Parenchyma cells were filled with starch granules, and calcium oxalate clusters could be seen in some parenchyma cells.
      (2) . According to the test of thin-layer chromatography (general rule 0502), suck 1 μ l of each of the above two solutions, dot them on the same silica gel G thin-layer plate respectively, use n-butanol glacial acetic acid water (4:1:1) as the developing agent, place them in the developing cylinder pre saturated with the developing agent for 15 minutes, develop, take out, dry them, spray 0.2% ninhydrin ethanol solution, heat them at 105 ℃ until the spots are clear. In the chromatogram of the test sample, spots of the same color appear on the corresponding position of the chromatogram of the control medicinal material.
      [check] moisture   Not more than 14.0% (the second method of general rule 0832).
      Total ash   Not more than 4.0% (general rule 2302),
      [extract] determined by the cold leaching method under the determination method of water-soluble extract (general rule 2201), it shall not be less than 25.0%.
      [nature, taste and meridian tropism] sweet, slightly bitter, and flat. Return to spleen and lung meridian.
      [functions and indications] invigorate Qi and spleen, generate fluid and moisten lung. .
      [usage and dosage] 9 ～ 30g.
      [storage] store in a ventilated and dry place, damp proof and mothproof.


2、 Chemical constituents of Pseudostellaria heterophylla
The root lipids of Pseudostellaria heterophylla containpalmitic acid（Palmiticacid）， ,β - sitosterol（β-sitoserol）[2]， It also contains sugar, amino acids [3], trace elements [manganese (13.4 μ g/g)] [4], and heterophyllin A andPseudostellaria cyclic peptideB[5，6]。

3、 Pharmacological effects of Radix Pseudostellariae
It can adapt to the body as it is, that is, it can enhance the body's defense ability against various harmful stimuli. It can also enhance the metabolism of substances in the human body