Conclusions
Coffee pulp could be a potential source of antioxidants.
SSF of coffee pulp by A. tamarii does not significantly
modify the total content of free and covalently
linked phenolic compounds, as measured by the Folin-
-Ciocalteu method. Nevertheless, a large increase (134 %)
in free hydroxycinnamic acids was observed in fermented
CP in comparison with the nonfermented material,
correlating with the antioxidant properties measured in
this study. Antioxidant properties of fermented and nonfermented
CP were evaluated by a kinetic approach as
estimated by mean dose (ED50), mean time (tED50 ) and
antiradical efficiency (AE). The best results of antioxidant
capacity were found for the fermented extract containing
the highest content of free HAs. Reduction of phenolic
compounds in fermented CP was due to the solid-
-state culture of A. tamarii. These results are experimental
evidence of the potential of using coffee pulp as a natural