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Quercetin is a yellow acicular crystal of dihydrate. It becomes anhydrous at 95 ~ 97℃, and its melting point is 314℃(decomposition).Soluble in cold ethanol (1∶290), soluble in hot ethanol (1∶23), soluble in methanol, ethyl acetate, glacial acetic acid, pyridine, acetone, etc., almost insoluble in water, benzene, ethyl ether, chloroform, petroleum ether, etc.Quercetin is widely found in nature. Its English name, Quercetin, first appeared in 1857. It comes from Quercetum, meaning oak forest, and is a natural auxin polar transport inhibitor.Quercetin has good expectorant and cough relieving effects, and has a certain antiasthmatic effect. In addition, it can also reduce blood pressure, reduce capillary fragility and enhance its resistance, reduce blood lipid, dilate coronary arteries and increase coronary blood flow.Quercetin can significantly inhibit the synthesis and growth of DNA, RNA and protein of carcinogens, malignant cells in vitro, and Ascites cancer cells.On the platelet aggregation induced by various factors have obvious inhibitory effect, can inhibit the release of 5 serotonin.Quercetin is a hydrolytic product of quercitrin, which belongs to flavonoids.
Quercetin can affect the proliferation, metastasis, apoptosis and metabolism of tumor cells through multiple signaling pathways, and has inhibitory effects on colorectal cancer, gastric cancer, breast cancer and leukemia.Quercetin powder is used in the treatment of chronic bronchitis and has adjuvant therapeutic effect on patients with coronary heart disease and hypertension.It can also be used in other industries.As an antioxidant, it is mainly used in fats, beverages, cold drinks and processed meat products.As a natural dye, it can be used as a medium dye for wool and cotton. It produces yellow with aluminum salt, olive yellow with chromium salt, orange with tin salt and olive green with iron salt.Foods rich in quercetin include tea, capers, angelica, apples, red Onions, red grapes, oranges, tomatoes, broccoli and other green leafy vegetables.They are also high in many berries, including raspberries, blueberries, cranberries, sea-buckthorn, rockthorn and cactus.
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