Guyan reagent-white fresh skin

White fresh skin [Pinyin name] Bái Xiān Pí [English name] CORTEX DICTAMNI [Alias] White moss skin, eight-strand cattle, mountain peony, sheep fresh grass [Source] This product is the dried root of Rutaceae plant white fresh Dictamnus dasycarpus Turcz. skin. In spring and autumn, the roots were excavated to remove silt and coarse skin, and peeled and dried. 【Properties】 This product is in the form of a roll, 5 to 15 cm long, 1 to 2 cm in diameter, and 0.2 to 0.5 cm thick. The outer surface is grayish white or light grayish yellow, with fine vertical wrinkles and fine root marks, often with protruding granular spots; the inner surface is off-white, with fine vertical lines. It is brittle, with dust flying when it breaks, the section is not flat, and it is slightly layered. Stripping the outer layer, you can see the flashing bright spots when facing the light. There is sheep fat, slightly bitter taste. [Identification] (1) Cross section of this product: the cork layer is more than 10 rows of cells. The cortex is narrow, the fibers are mostly scattered, yellow, diameter 25 ~ 100μm, wall thickness, obvious striation. The phloem is broad with 1 to 3 rows of cells; the fibers are scattered individually. There are many calcium oxalate cluster crystals in the parenchyma, with a diameter of 5-30 μm. (2) Take 1g of this product, pulverize it, add 20ml of chloroform, sonicate for 10 minutes, filter, evaporate the filtrate, and add 1ml of methanol to dissolve the residue as the test solution. Another 1g of fresh white peel control medicinal material was prepared into a control medicinal solution in the same way. According to the thin layer chromatography (Appendix VI B) test, draw 5 μl of each of the above two solutions, respectively, and spot them on the same silica gel G thin layer plate, using n-hexane-ethyl acetate (3: 2) as the developing agent, to develop, Take it out, dry it, smoke it in iodine vapor until the spots are clear. In the chromatogram of the test product, the spots of the same color are displayed on the corresponding position of the chromatogram of the control medicinal material. 【Processing】 Remove impurities, wash, moisten, cut thick slices, and dry. 【Sexual taste】 Bitter, cold. 【Meridian】 Return to the spleen, stomach and bladder. 【Functions】 Clear heat and dampness, remove wind and detoxify. It is used for damp and heat sores, yellow water dripping, eczema, rubella, scabies sore, rheumatic fever, jaundice and red urine. 【Usage and Dosage】 4.5 ～ 9g; appropriate amount for external use, decoction washing or powder application.

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