What is Liuhan Chinese medicine?

There are hundreds of types of Chinese medicine, and different Chinese medicines have different therapeutic effects. Putting several Chinese medicines together has a good effect on treating diseases. Coupled with the advantage of small side effects, Chinese medicine is very popular among people. Liuhan is also a kind of traditional Chinese medicine, but many people may not be familiar with it. So what kind of traditional Chinese medicine is Liuhan? Liuhan is a traditional Chinese medicine with plant properties. It should be used under the guidance of a doctor.

Six sweats

Liuhan is the dried root of the plant Dipsacus asper of the Dipsacus family, which has the effect of traditional Chinese herbal medicine.

Plant properties

【Source】 This product is Dipsacus asperoides CY Cheng et TM Ai (or Dipsacus asperoides

The dried root of the Six-Han Wall. Dig up in autumn, remove the root head and fibrous roots, bake over low heat until half dry, pile up to "sweat" until the inside turns green, and then dry again.

[Original form] Perennial herb, 60 to 90 cm high. The root is conical, with a distinct taproot or several roots growing side by side, and the outer skin is yellowish-brown. The stem is erect, much branched, with ridges and shallow grooves, covered with fine soft hairs, and sparse prickles on the ridges. Leaves are opposite. It blooms in late summer and early autumn, and the inflorescence head is nearly spherical. Achenes are elliptic cuneate, about 3 to 4 mm long, usually covered with sepals, four-angled, and light brown.

Chinese medicine properties

Medicinal material preparation method

【Preparation method】

Dipsacus asper: wash, soak thoroughly, cut into thin slices and dry. This product is round or oval in shape. The bark of the cross section is dark green or brown, the wood is grayish yellow or yellowish brown, radially arranged vascular bundles can be seen, and there are many dark rings in the cambium. Determined by the method under the above [Extract], it shall not be less than 45.0%.

Wine-roasted Dipsacus asper: Take Dipsacus asper slices and stir-fry them according to the wine-roasting method (Appendix ⅡD) until they are slightly black. Salt-roasted Dipsacus asper: Take Dipsacus asper slices and stir-fry until dry according to the salt-roasting method (Appendix Ⅱ D).

[Properties] This product is cylindrical, slightly flat, and sometimes slightly curved, 5 to 15 cm long and 0.5 to 2 cm in diameter. The surface is gray-brown or yellow-brown, with slightly or obviously twisted longitudinal wrinkles and grooves, transverse lenticels and a few root traces. It is soft in texture, becomes hard after being left for a long time, is easy to break, and has an uneven cross section. The bark is dark green or brown, the outer edge is brown or light brown, the wood is yellowish brown, and the vascular bundles are arranged radially. It has a slight fragrance and tastes bitter, slightly sweet and then astringent.

Identification of medicinal materials

【Identification】

(1) Cross section of this product: rows of cork cells. The cortex is narrow. Phloem sieve tube groups are sparse. The cambium ring is obvious or not obvious. The xylem rays are broad, and the vessels are densely distributed near the cambium, becoming increasingly sparse toward the inside, often scattered singly or in groups of 2 to 4. The pith is small and the fine roots are mostly pithless. The thin-walled cells contain clusters of calcium oxalate crystals. Yellow-brown powder. There are many clusters of calcium oxalate crystals, with a diameter of 15 to 50 μm, scattered or present in wrinkled thin-walled cells, and sometimes several are arranged in tight strips. The walls of the spindle-shaped thin-walled cells are slightly thicker and have obliquely interlaced fine textures. The diameter of the bordered pits and reticulated ducts is about 72 (90) μm. Cork cells are light brown, rectangular, square, polygonal or long polygonal in surface view, with thin walls.

(2) Take 5 g of the powder of this product, add 2 ml of ammonia test solution, stir evenly, add 50 ml of chloroform, heat under reflux for 1 hour, and filter. Add 10 ml of hydrochloric acid solution (1→100) to the filtrate, shake, take the acid solution, add ammonia test solution to make it alkaline, add 10 ml of chloroform, shake, take the chloroform solution, add 5 ml of hydrochloric acid solution (1→100), shake, take the acid solution and divide it into three test tubes: add potassium bismuth iodide test solution to one tube to generate an orange-yellow precipitate; add potassium mercuric iodide test solution to one tube to generate a yellow turbidity; add silicotungstic acid test solution to another tube to generate a gray-white turbidity.

(3) Take 3 g of the powder of this product, add 4 ml of concentrated ammonia test solution, mix well, let stand for 1 hour, add 30 ml of chloroform, ultrasonically treat for 30 minutes, filter, extract the filtrate with 30 ml of hydrochloric acid solution (4→100) in batches, adjust the pH value of the extract to 10 with concentrated ammonia test solution, and then extract with 20 ml of chloroform in batches. Combine the chloroform solutions and concentrate to about 0.5 ml as the test solution. Take another 3g of Dipsacus as a reference medicinal material and prepare a reference medicinal material solution in the same way. Take 10 μl of each of the above two solutions and spot them on the same silica gel G thin layer plate prepared with 2% sodium hydroxide solution. Use benzene-anhydrous ethanol (9:2) as the developing agent, develop, take out, dry, first spray with dilute potassium bismuth iodide test solution, then spray with 5% sodium nitrite in 70% ethanol solution, leave it for a while, and examine it under sunlight. In the chromatogram of the test sample, spots of the same color appear at the corresponding positions in the chromatogram of the control medicinal material.