2.8. Radical scavenging activity using DPPH method
Radical scavenging activity of the extracts was determined
essentially as described by Blois (1958) with some modification.
Different concentrations (25, 50 and 100 μL equivalent to 25, 50 and
100 μg, respectively) of the extracts and BHA (25, 50 and 100 μg) were
taken in different test tubes. The volume was adjusted to 100 μL by
adding MeOH. Five milliliters of 0.1 mM methanolic solution of
DPPH was added to these tubes and shaken vigorously. The tubes
were allowed to stand at 27 °C for 20 min. The control was prepared
as above without any extract and MeOH was used for the baseline
correction. The changes in the absorbance of the samples were measured
at 517 nm. Radical scavenging activity was expressed as the
inhibition percentage and was calculated using the following formula,
% radical scavenging activity = ðControl OD−sample OD= Control ODÞ × 100: