3.4. Reducing power of coffee conserves
The antioxidant activities of natural components may
have a reciprocal correlation with their reducing capacity
(Duh, 1998). In this study, the Fe3+–Fe2+ transformation
was determined as reducing capacity. Results (Fig. 3) indicate
that both the coffee conserves (crude and purified)
exhibited effective reducing capacity at all concentrations.
The reducing power of coffee conserves (as indicated by
the absorbance at 700 nm) correlated well with increasing
concentrations. Differences in the antioxidant activity
between the components of coffee conserve were found to
be extremely significant (F = 3933.356***).