Medicinal value

summary

Efficacy: sweating, expelling wind, promoting blood circulation, clearing away heat and toxic materials. duckweed

Indications: heat carbuncle, impenetrable macula, wind-heat painful eruption, skin itching, edema, amenorrhea, tinea, erysipelas and scald. Nature and taste return to meridian: pungent and cold. 1 classic: "pungent, cold." ② Don't record: "Acid, non-toxic." ③ Southern Yunnan herbs: "Cold in nature and bitter in taste." ④ Medical forest editor: "pungent, flat and salty." Enter the lung meridian. ① Outline: "Entering the Lung Meridian." ② Description of properties of Leigong gun products: "Into lung and small intestine." (3) seeking truth from facts: "human liver and spleen." Usage and dosage: oral administration: decoction, l ~ 2 yuan (0.5 ~ l); Pour juice or take pills. External use: decoction, fumigation, grinding, coring or application. Medication should be avoided: ① Materia Medica Classic: "Indications are qi deficiency and spontaneous sweating." (2) "New Materia Medica": "You can't try it lightly unless it is hot." (3) Depei Materia Medica: "Blood deficiency and dry skin, qi deficiency and wind pain, both of which are forbidden."

Literature discussion

1, Tang Materia Medica: There are three kinds of duckweed people: the biggest one is called apple; There are Jiangcai in the water, which is similar, and the leaves are round; Duckweed on water cures fire sores. 2. Materia Medica: Xiaopingzi is a ditch. The cloud level in Shennong's Herbal Classic should be a minor. 3. Outline: The duckweed used in materia medica is duckweed, not duckweed. Tao Su always makes mistakes with big apples. Ping and Ping sound similar, but the words and shapes are different. There are many duckweeds in the pond, and Ji Chun was born. A leaf stays overnight, there are several leaves, and there are micro-whiskers under the leaves, which are its roots. A green back. A person with a blue face and a purple back is called Ziping. Just take the medicine. It was picked in July. The duckweed with purple back was picked in July. It was cleaned, spread in the sun with a bamboo screen, and reflected in a basin of water. It was easy to dry. 4, "Materia Medica Seeking Truth": duckweed, burning cigarettes to repel mosquitoes is also good. But people with qi deficiency should not approach the bus. 5, "Materia Medica": Level, its body is frivolous, its nature is dry, and it can also dispel damp heat. When the hot air is depressed in the skin, it itches, tastes pungent and cold, and can disperse the damp heat of the skin. Cold can remove heat and dryness can remove moisture, so it is wet. Wine is hot and humid, but flat and not immersed in water, and its smell is pungent and cold, so it can be used to make wine. Blood heat will make hair dry and easy to fall off, and cold blood will make hair grow. 6, "Don't record": the main thirst-quenching person has the evil of damp heat, the body fluid is self-generated, and thirst stops. It's called "Xiaqi", and bathing and germinating also uses cold energy to clear heat and cool blood. 7. Zhang Shousheng: Duckweed is the most frivolous, so it spreads lung qi, reaches fur, perspires to relieve summer heat and drains. Classic, Bielu and Daming are all in this range. But it not only cures qi, but also clears blood heat. Therefore, promoting granulation to treat hematemesis, Sheng Hui prescription to treat nasal blood vessels, and Linhu to treat aphtha. Good at clearing fire and conducting heat downwards, with good results. People close to you think it's a medicine for sweating, but they don't know that clearing away heat is their specialty, and they think it's not used to the extreme. Moreover, it has the lightest mass and a thin smell. Although it is called sweating, it is tepid and there must be no sweat. duckweed

Identification of raw medicinal materials

Microscopic identification: On the surface of the bacteria, the vertical peripheral wall of the upper epidermal cells is slightly curved, the stomata are uncertain, and there are 5-7 subsidiary cells. The vertical wall of the lower epidermal cells is almost straight, and there is no stomata. The mesophyll cells inside the upper epidermis are polygonal. Some cells contain calcium oxalate cluster crystals with a diameter of 13-30μ m, while others are large and oblong, containing needle-like crystals of calcium oxalate with a length of17-13-30μ m, and the cells near the lower epidermis are ventilated tissues, which are composed of thin-walled cells with large cell gaps.

pharmacological action

1. Diuretic effect: Diuretic components are potassium acetate and potassium chloride. 2. Cardiovascular effect: The water extract of duckweed has cardiotonic effect on the heart of quinine-induced aging frog, which can be enhanced by calcium, and the heart stops in diastolic phase at high dose; It constricts blood vessels and raises blood pressure. 3. Antipyretic effect: duckweed soup and granule (2g/kg) were given orally to rabbits with fever caused by typhoid mixed vaccine, which proved to have weak antipyretic effect.

Chemical constituents of traditional Chinese medicine

Duckweed contains potassium acetate and potassium chloride "and substances such as iodine and Australia". Qingping contains a large number of water-soluble vitamins such as vitamins B 1, B2 and C, flavonoids such as draft luteolin -7- oral-glucose 2, draft 8- basic luteolin -8-β- glucose 2, iodine, ethanol and other substances. Its polysaccharide is a rich source of D- celery sugar. It also contains resin, wax, graphics, nj6 green, sugar, protein, mucus, jute and so on. The whole grass mainly contains orientin, luteolin -7- monoglucoside, vitexin, cosmosiin and so on. It also contains tannins and lipid compounds. It also contains β-carotene, lutein, potassium acetate and potassium chloride.

Chemical identification of traditional Chinese medicine

Take the acetic acid extract of this product, evaporate it to dryness, add distilled water to dissolve it, add a small amount of magnesium powder and 2 drops of concentrated hydrochloric acid, and heat it until it boils and turns orange. (check flavonoids)

comment

(1) is used to treat exogenous wind-heat, measles, and is often combined with Xihe willow, burdock and mint. For wind-heat addiction, it can also be taken orally and externally. Duckweed can clear away heat and promote diuresis, so it is used for edema and exterior heat. duckweed

Party selection

① Timely treatment of fever and sweating: one or two duckweeds, half ephedra (going to the festival to report), half cinnamon, and half aconite (removing navel and peeling). Four things were mashed and sieved. Take two yuan each time, a glass of water, half a cent of ginger, and fry until six points. Take it with me regardless of time. ("Illustration of Materia Medica") 2 Treatment of wind-heat on the skin, with addiction rash all over the body: burdock, duckweed, etc. Mix two yuan with mint soup and take it twice a day. ("The Essential Prescription of Health Preservation") 3 Treatment of deficiency and itching on the body: duckweed has one dollar at the end and Ping Huang has one dollar. Decoct the soup with siwu soup and adjust it. ("Danxi Compendium") 4 Treating summer heat and thirst is not limited to the irritability of Chinese medicine: the water is flat, washed and air-dried as the end, and the Chinese milk pill is the size of a plane tree. Whenever you take it, take porridge for 39 minutes. ("Sheng Hui Fang") 5 Cure thirst: dried duckweed, containing wilting roots, etc. The first two flavors are the last. Human milk and pills are like dried fruits. Take 20 tablets on an empty stomach for three days. ("Qian Jinfang" Duckweed Pill) 6 Heat poison treatment: Duckweed mash juice and apply it all over the body. ("Secret Records of Mother and Child") ⑦ Treatment of wind and phlegm: First, duckweed, picked in March, scoured for three or five times, baked for three or five days, no mouth. Take San Qian with warm wine before eating. In February and July, duckweed with purple back was taken, dried in the sun for half a liter, and scattered in the wind for five or two. Five yuan each time, decocted in water frequently; Let's take a bath with decoction. ("Ten Convenient Recipes") 8 Treatment of carbuncle: moderate amount of Spiraea, moderate amount of juice, moderate amount of root bark and powder of Russula (mountain crab), one tablespoon. Mix the medicines evenly and apply externally, leaving a hole in the middle. ("Survey Data of Single Square Selection") 9 Treatment of urinary tract obstruction, abdominal distension and water swelling: duckweed in water, dry violently, and finally, take it three times a day. (Gan Jin Fang) Indications for acute nephritis: two duckweeds and one or two black beans. Decoct with water. (Selected Data of New Medical Treatment of Chinese Herbal Medicine in Inner Mongolia) 1 1. Treating eye sores and rashes, the pain is unbearable, which may hurt the eyes: duckweed, dry in the shade as the end, one or two yuan each time, half a catty of sheep liver, put it in a basin, and stab it with a bamboo stick. Pour half the water, twist the liver juice and take it after meals. (Duckweed Powder) 12. Treatment of sweat spot carbuncle: duckweed with purple back, dried. Take four or two decoctions in each bath and wipe them with a flat surface. Or you can use two dollars to defend yourself. ("pocket square") 13. Treat my face: the ditch is Xiaoping, not the end, counting. ("Fang") 14. Remove snake cough and poison into dantian: smash duckweed to get juice and drink it. (The Essentials of Product Collection) 15. The nasal treatment boat is not limited to: dry duckweed powder, blown into the nose. ("Fang") 16. Treatment of pterygium crawling eyes: a little green ping, grinding, a little into the brain, sticking to the eyes. (The Good Prescription of Doctors in the World)