3.4. Total phenolic content versus radical scavenging activity
Among the seven samples analyzed, the three methanolic fractions showed a significant phenolic content and radical scavenging activity. In general, extracts or fractions with a high radical scavenging activity showed a high phenolic content as well, but good correlations could not be found among them (see Fig. 1). A direct correlation between radical scavenging activity and phenolic content of the samples was demonstrated by linear regression analysis. The correlation coefficient between total phenolics and DPPH and between total phenolics and CL found to be 0.425 and 0.375, respectively. In general, the ethyl acetate fraction showed the highest TPC and the highest radical scavenging activity in both the tests of DPPH and CL.