Curcumin | 458-37-7
Product Description:
Physical properties: Curcumin is an orange yellow crystalline powder, melting point 183°. Curcumin is insoluble in water and ether, but soluble in ethanol and glacial acetic acid.
Curcumin is orange yellow crystalline powder, taste slightly bitter. Insoluble in water, soluble in alcohol, propylene glycol, soluble in glacial acetic acid and alkali solution, when alkaline is reddish brown, when neutral, acidic yellow. The stability of reducing agent is strong, strong coloring (not to protein), once the color is not easy to fade, but light, heat, iron ion sensitive, light resistance, heat resistance, iron ion resistance is poor. Since curcumin has two hydroxyl groups at both ends, the conjugate effect of electron cloud deviation occurs under alkaline conditions, so when PH is greater than 8, curcumin will turn from yellow to red. Modern chemistry USES this property as an acid - base indicator.
The Main Use of Curcumin:
1. Curcumin can be used as an edible yellow pigment. Curcumin is commonly used in the coloring of beverages, candies, pastries, intestinal products, dishes, sauces, tins and other foods, as well as cosmetics and pharmaceuticals. Curcumin has long been used in radish and curry powder in China. Curcumin can also be used in pickles, ham, sausage, and in sugar-soaked apples, pineapples, and chestnuts.
2. Curcumin can be used as an acid-base indicator and is yellow at PH 7,8 and reddish-brown at PH 9.2.
3. Curcumin is often used in food, dishes, pastries, candy, canned drinks, cosmetics, medicine coloring.
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