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  • Title: Separation and free radical-scavenging activity of major curcuminoids of Curcuma longa using HPTLC-DPPH method.
    Author: Pozharitskaya ON, Ivanova SA, Shikov AN, Makarov VG.
    Journal: Phytochem Anal; 2008; 19(3):236-43. PubMed ID: 17929240.
    Abstract:
    A direct HPTLC assay was developed for the determination of total curcuminoids and three individual curcuminoids, curcumin, demethoxycurcumin and bisdemethoxycurcumin. In addition, a new procedure was developed to separate and quantitative the free radical-scavenging activity of individual compounds from the rhizome of Curcuma longa L. (Zingiberaceae) based on the combination of HPTLC with a diode array detector (DAD) and post chromatographic DPPH(*) radical derivatisation. It was established that both individual curcuminoids and the extract of C. longa were capable of scavenging DPPH(*) radicals. From the estimated ID(50) values, it can be seen that the order of activity was curcumin > demethoxycurcumin > bisdemethoxycurcumin >> ascorbic acid. However, the ID(50) values of curcuminoids were not significantly different. The data indicates the presence of a synergistic mechanism of antiradical activity of curcuminoids.
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