Pennycress
1、 Pharmacopoeia standard of pennycress       This product is the dry aboveground part of the cruciferous plant Thlaspi arvense L. In summer, the fruits are harvested when they are ripe, and the impurities are removed and dried.
      [character] the stem of this product is cylindrical, 20 ~ 40cm long, 0.2 ~ 0.5cm in diameter; the surface is yellowish green or grayish yellow, with fine longitudinal edges; . The leaves are alternate and lanceolate, and the basal leaves are mostly oblanceolate and fall off. The racemose inflorescence is located at the top of stem branches and leaf axils, and the fruit is oval and flat, with a diameter of 0.5 ~ 1.3cm; the surface is grayish yellow or grayish green, the center is slightly raised, the edge is winged, about 0.2cm wide, there is a longitudinal edge line in the middle of both sides, the apex is concave, and there is a thin fruit stem at the base, about 1cm long; the fruit is divided into 2 chambers, with a longitudinal septum in the middle, and 5 ~ 7 seeds in each chamber. Seeds oblate ovoid. The air is weak and the taste is light.
      [identification] (1) cross section of the stem of this product: the epidermis is a row of square thin-walled cells, with thickened peripheral walls and extremely thick ridges. The cortex consists of more than 5-10 rows of parenchymal cells. The sheath fibers of the middle column are light yellow, in groups of several to dozens, and the wall is slightly lignified or non lignified. . Xylem vessels are polygonal, with constant groups. Among the vascular bundles are lignified fibers with 10-25 rows of cells in width. The medulla is broad, the surrounding 5-10 rows of cell walls are slightly thick, lignified, with round or oblong single striated pores, and the rest are parenchymal cells.
      (2) Take 1g of this product powder, add 20ml of methanol, sonicate for 30 minutes, filter, and concentrate the filtrate to 2ml as the test solution. Another 1g of the reference medicinal material of pennycress was prepared into the reference medicinal material solution by the same method. . In the chromatogram of the test sample, fluorescent spots of the same color appear at the position corresponding to the chromatogram of the control medicinal material.
      [check] impurities   Not more than 3.0% (general rule 2301).
      Moisture   Not more than 10.0% (the fourth method of general rule 0832).
      Total ash   Not more than 10.0% (general rule 2302).
      Acid insoluble ash   Not more than 2.0% (general rule 2302).
      [extract] determined according to the cold leaching method under the determination method of water-soluble extract (general rule 2201), it shall not be less than 15.0%.
      Decoction pieces
      [processing] remove impurities, moisten slightly, cut into sections, and dry.
      [nature, taste and meridian tropism] pungent, slightly cold. It belongs to the liver, stomach and large intestine.
      [functions and indications] it can clear the liver and eyesight, moderate and diuretic, detoxify and detumescence. It is used for red eye swelling and pain, abdominal distension and pain, hypochondriac pain, intestinal carbuncle, edema, lower band, sore and furuncle carbuncle.
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2、 Chemical constituents of pennycress
Whole grass containsbenzyl glucosinolate （glucosinolate）， InsideMyroside（sinigrin）

3、 Pharmacological effects of pennycress
Black mustard glucoside itself has no irritation. Once hydrolyzed into mustard oil, it has strong irritation and bactericidal effect. It can also be used in gout to increase uric acid excretion.