Purple-backed duckweed

Purple-backed duckweed belongs to the family Lemnaceae and the genus Spirodendrum. It has a green ventral leaf blade and is a perennial floating plant that lives on the surface of small still water bodies. It can be used as medicine.

The efficacy and function of purple-backed duckweed

1. Protect cardiovascular system.

The water extract of duckweed has a cardiotonic effect on frog hearts that are in failure due to quinine. Calcium can enhance this effect. Large doses can stop the heart in diastole and constrict blood vessels to increase blood pressure.

2. Antipyretic.

The decoction and infusion of Qingping were administered orally at a dose of 2 g/kg to rabbits with fever caused by injection of typhoid mixed vaccine, and it was shown to have a weak antipyretic effect.

3. Diuretic effect.

The diuretic ingredients are potassium acetate and potassium chloride.

4. Disperse and relieve exterior symptoms.

The lung governs qi and breathing. It is connected to the skin and fur. It opens the orifices in the nose, clears the water channels, and transmits to the bladder. It governs the surface of the whole body. If the pathogen invades the skin surface, the skin and pores are blocked, the lung qi is blocked, and the water channels are blocked. Clinically, the upper-jiao lung-defense surface syndrome can be seen. "Treat the upper-jiao like a feather, it will not rise unless it is light." This is one of Wu Jutong's general principles for treating the upper-jiao. Duckweed tastes pungent and is cold in nature. It is light and ascending. It is good at clearing the pores, dispelling wind and heat. In ancient times, it was said that sweating is better than ephedra. It is a good product for sweating and dispelling wind-heat syndrome, and dispelling the surface and rash in the early stage of measles.

5. Promote diuresis and reduce swelling.

Water metabolism is closely related to the functions of the lungs, spleen, and kidneys. The lungs are responsible for the distribution of body fluids and regulating the water channels, while the spleen is responsible for the transportation and transformation of water and moisture; the kidneys are responsible for the evaporation and gasification of water. Dysfunction of the three organs can cause water to accumulate in the body and cause edema. Duckweed is pungent in taste and cold in nature and enters the lung and bladder meridians. It is mainly used to treat edema caused by various factors that lead to abnormal lung regulation function.

The edema treated by duckweed belongs to the yang water caused by the overflow of wind and water. The purpose of eliminating edema is achieved by utilizing its effects of dispelling wind, clearing heat and promoting diuresis.

6. Dispel wind and relieve itching.

Duckweed can be used for urticaria and skin itching: urticaria and skin itching are both caused by wind evil. There are external wind and internal wind. External wind is mostly caused by loose skin pores, exogenous wind-heat or wind-cold evil, or gastrointestinal dampness and heat, sympathetic wind evil, and internal wind evil. Internal wind is mostly caused by emotional injury, stagnation of qi and blood, wind and dryness, and malnutrition of skin and skin. Duckweed is mainly used to treat urticaria and skin itching caused by exogenous wind-heat. Clinically, urticaria is red, burning and itchy, with scratches all over the body, especially when encountering wind and heat. In addition, wind-heat symptoms can also be seen. Taking the pungent and cold nature of duckweed, it is light, clear, and disperses wind and heat, and the urticaria will disappear and the itching will stop.

Nutritional value of purple-backed duckweed

Purple-backed duckweed contains potassium acetate, potassium chloride, iodine, iodine and other substances. Green duckweed contains a lot of water-soluble vitamins such as vitamin B1, B2, and C, flavonoids such as olein-7-glucose, 8-hydroxy-olein-8-glucose, and substances such as iodine and molybdenum. Its polysaccharide is a rich source of D-Apiose. It also contains resins, waxes, graphene, chlorophyll, sugars, proteins, mucilage, and chrysanthemum. The whole plant mainly contains orientin, luteolin-7-monoglucoside, vitexin, apigenin-7-monoglucoside, cosmosiin, etc. It also contains tannins and lipid compounds, including linolenic acid, palmitic acid, linoleic acid, etc. It also contains carotene, lutein, potassium acetate, and potassium chloride.

Medicinal value of purple-backed duckweed

[Source]: It is the whole herb of purple-backed duckweed or green duckweed of the Lemna family.

【Effects】: Induce sweat, dispel wind, promote water circulation, clear away heat and detoxify.

[Indications]: Treats hot carbuncle, macules that do not clear up, wind-heat rash, itchy skin, edema, amenorrhea, sores, tinea, erysipelas, and burns.

[Nature and flavor]: pungent, cold

①《Ben Jing》: "Tastes spicy, cold."

② "Bie Lu": "sour, non-toxic."

③ "Southern Yunnan Materia Medica": "Cold in nature, bitter in taste."

④ "Medical Collection": "Spicy, neutral, and salty."

Enters the lung meridian. ① "Compendium of Materia Medica": "

Enters the lung meridian. "② "Leigong Paozhi Yaoxing Jie": "Enters the lung and small intestine meridians." ③ "Ben Cao Qiu Zhen": "Enters the liver and spleen. "

【Usage and Dosage】: For internal use: decoct in water, 1-2 qian (0.5-1 liang for fresh); mash into juice or make into pills or powder. For external use: decoct in water for fumigation and washing, grind into powder and apply or mix with water for application.

Side effects of purple-backed duckweed

Side effects are caused by poor drug selectivity and are inherent in the drug itself. Whether it is a prescription drug or an over-the-counter drug, it should be used under the guidance of a doctor or pharmacist. If you feel uncomfortable while taking the drug, you must stop taking it in time and consult a doctor or pharmacist to avoid unnecessary damage.

Contraindications for using Purple Back Duckweed

① "Compendium of Materia Medica": "If the patient has spontaneous sweating due to deficiency of qi in the exterior, use it hastily." ② "New Compendium of Materia Medica": "If the patient has no severe fever, do not try it lightly."

③ "Depei Materia Medica": "Blood deficiency and dry skin, Qi deficiency and wind pain, both are forbidden."