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It is yellow needle-like crystalline powder. It has good thermal stability with the decomposition temperature being 314 °C. It can improve the light-tolerance property of food pigment for preventing the change of the flavor of food. Its color will change in case of metal ion. It is slightly soluble in water, soluble in an alkaline aqueous solution. Quercetin and its derivatives is a kind of flavonoid compound which are widely present in a variety of vegetables and fruits such as onions, sea buckthorn, hawthorn, locust, tea. It has effects of anti-free radical, anti-oxidation, anti-bacterial, anti-viral as well as anti-allergic. For application in lard, its various antioxidant indicators are similar with that of BHA or PG.Because of the double bond between the 2,3 position as well as the two hydroxyl groups in 3 ', 4' , it has application of being used as a metal chelate or being the receptor of the free groups produced during the oxidation process of grease. In this case, it can be used as the antioxidants of ascorbic acid or grease. It also has a diuretic effect.The name of quercetin has been used since 1857, which is derived from quercetum (oak forest) after Quercus. Quercetin is widely found in flowers, leaves, and fruits of various plants. Vegetables (such as onions, ginger, celery, etc.), fruits (such as apples, strawberries, etc.), beverages (such as tea, coffee, red wine, fruit juice, etc.), and more than 100 kinds of Chinese herbal medicines (such as Threevein Aster, mountain white chrysanthemum, Huai rice, Apocynum, Ginkgo biloba, etc.) contain this ingredient.1. It can be used as a kind of antioxidant which is mainly used for oil, drinks, cold drinks, meat processing products.2. It has good effects of expectorant, anti-cough, anti-asthma and can be used for treating chronic bronchitis as well as for adjuvant therapy of coronary heart disease and high blood pressure.3. It can also be used as analytical standards.
