CONCLUSION
In this report, a model was derived to calculate the
redox potentials of phenolic compounds using calculated
parameters (Hfr, Hfp, Elumo-r and OH). This model can be
used to predict the redox potentials of other new phenolic
compounds without available Brown s1. A similar
model containing DHf and Ehomo was obtained for vitamin
E derivatives. This model is useful in predicting the
antioxidant activities of new vitamin E derivatives. An
attempt was made to correlate the Trolox equivalent
antioxidant capacity (TEAC) of 42 flavonoids with various
physicochemical parameters. A highly significant
correlation (r2 5 0.845) was obtained using the number
of hydroxyl groups (OH) and an indicator variable (I).
This equation may be useful in explaining the physicochemical
contribution factors to the antioxidant activity
and in estimating the TEAC values and potential biological
activities of flavonoids.