Five samples of curcuma like Curcuma longa, Curcuma amada, Curcuma angustifolia, Curcuma casiea and Curcuma aromatica were analyzed using spectrophotometric detection, which was done at 420 nm. Curcumin was extracted from the five samples quantitatively through boiling the substance in acetone. The amount of curcumin was then measured using a spectrophotometer within range from 200 to 700nm range. Curcumin has a potent, broad peak of absorption at about 425nm. At 420 nm, the absorption spectrum of different concentrations of extracts was measured. The amount of curcumin in each species is said to be different. The results showed that the technique can be used easily to examine the purity of curcumin in bulk and in preparations on a regular basis.