where At and Ct are the absorbance values measured for the
test sample and control, respectively, after incubation for
120 min, and C0 is the absorbance values for the control measured
at zero time during the incubation. The results are expressed
as IC50 values (lg/mL), the concentration required
to cause a 50% b-carotene bleaching inhibition. Tests were
carried out in triplicate.