Bio Chemical properties

Property name	Property value	Notes/description
Molecular formula	C21 H20 O6	Molecular formula for curcumin
Main curcuminoids present in turmeric	Curcumin Demethoxycurcumin Bisdemethoxycurcumin	Curcumin is the main curcuminoid and it is considered to be most active constituent.
		The curcuminoid are polyphenols and are responsible for the yellow color of turmeric.
Tautomeric forms of curcumin	keto and enol[7] [Figure 2–3] It can also exist as cis-trans isomeric forms.[8]	The enol form is more energetically stable in the solid phase and in solution. Curcumin can be used for boron quantification in the so-called curcumin method. It reacts with boric acid forming a red color compound known as rosocyanine. It has photo-biological and photosensitizing activity.
E number	E100	As curcumin is brightly colored, it may be used as a food color. It is often used as food additive.
Melting point	183°C (361 K)
Color	It can appears as bright yellow to orange powder
Molar mass	368.38 g/mol
Systemic name	(1E,6E)-1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione)	Other names for the curcumin are curcumin diferuloylmethane, C.I. 75300, Natural Yellow 3