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Scavenging capacity (%) = 100 - [(absorbance of sample - absorbance of blank) × 100/absorbance of control]

The tests were done in triplicate. The IC50 values were calculated by linear regression of plots, where

the abscissa represents the concentration of the tested plant extracts and the ordinate the average

percent of scavenging capacity. The concentration of sample required to scavenge 50% of DPPH

(IC50) were determined.

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