Curcumin powder is extracted from the root of turmeric, biologically called curcuma longa. Curcumin is orange yellow crystal
powder with bitter taste and characteristic odor. Its molecular formula is C21H20O6 and CAS number is 458-37-7. Curcumin is one of
the most important substances in curcuminoids, which contain several compounds, including curcumin, demthoxycurcumin,
bisdemethoxycurcumin and so on.