Hashem F.
Free radical scavenging activity of the Flavonoids isolated from Tecoma Radicans.
J Basic Applied Sci Jan ;3(1):49-53.

Successive extracts of aerial parts of Tecoma radicans, F. Bignoniaceae, showed free radical scavenging activity. Ethyl acetate extract produced maximum inhibition (97.8%) of DPPH using electron spin resonance (ESR) technique. Activity-guided fraction led to the isolation of the flavonoids. Five were identified as luteolin; quercetin 3-methyl ether; apigenin; 6-hydroxyluteolin and chrysoeriol. The most potent of them as free radical scavenger is quercetin 3-methyl ether 68.9%, then luteolin 39.4%

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