The antioxidant activity (AA) of
the extracts was evaluated in terms of bleaching of the
b-carotene using the following formula (Hidalgo et al.,
1994).
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AA ˆ 100‰1 À …Ao À At †=…Ao À At †Š where Ao and Ao
are the absorbance values measured at zero time of the
incubation for test sample and control, respectively.