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"Curcumin, the principal curcuminoid found in the spice turmeric, has long been used in Asian medicine to treat a variety of maladies. Curcumin is yellow in color and is used to make curry powder thus giving it the distinctive color.
Its chemical makeup is responsible for the yellow coloring of turmeric, and is often used specifically to give color to foods. However, it may serve a more important purpose to humans. Curcumin has numerous beneficial properties and is helpful in many conditions. It has been used in Chinese herbal medicine mainly as a blood purifier as well for treatment of stomach ailments. It is also said to have anti-viral, anti-oxidant, anti-fungal, anti-cancer, anti-bacterial and anti-inflammatory properties.
Curcumin can exist in several tautomeric forms, including a keto form and two equivalent enol forms. The enol form is more energetically stable in the solid phase and in solution.
Curcumin and Turmeric
Someone may be confused with the differences between curcumin and turmeric. In fact, Curcumin, which has powerful antioxidant and anti-inflammatory properties, is the most active constituent of turmeric. Curcumin is the principal curcuminoid in turmeric. Curcuminoids are polyphenolic compounds that give turmeric its yellow color. Turmeric is derived from the rhizomes (underground stems) of the plant Curcuma longa, a member of the ginger family. It is native to tropical South Asia and needs temperatures between 20°C and 30°C (68°F and 86°F) and a considerable amount of annual rainfall to thrive. Plants are gathered annually for their rhizomes, and propagated from some of those rhizomes in the following season."