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luteolin is a kind of natural flavonoid, which is found in many kinds of plants. It has a variety of pharmacological activities, such as anti-inflammatory, anti-allergic, uric acid lowering [1], anti-tumor, anti-bacterial, anti-viral, etc. Clinically, it is mainly used to relieve cough, expectorate, anti-inflammatory, uric acid lowering [2], treat cardiovascular diseases, treat "amyotrophic lateral sclerosis", SARS, hepatitis, etc.

solubility
Luteolin was isolated from ethanol as a golden spicules containing a crystalline water. Soluble in ethanol, diethyl ether; Slightly soluble in hot water, insoluble in cold water. The aqueous solution is a pleasant light yellow, soluble in 10% sodium hydroxide aqueous solution, and dark yellow. Soluble in concentrated sulfuric acid to form zinc salt, dark red yellow.

Luteolin is widely distributed in nature. It was originally separated from the leaves, stems and branches of the herb luteolin (ResedaodorataL.) in the family Resedaceae. It can be separated from a variety of natural herbs and fruits of vegetables. It was found that it was mainly found in honeysuckle, chrysanthemum, Schizonopsis thunb., artichoke, Perilla, Scutellaria, Purpura nubria and other natural medicinal materials, as well as in vegetables and fruits such as sprouts, cabbage, cauliflower, beet, broccoli, carrot, celery, sweet pepper, pepper and groundnut. Luteolin is also found in other plant products, such as olive oil and red wine, as well as in balsamina, thyme, and the labiaceae plants whole leaf and sinew.