4. Conclusion
The results of this study suggested that stabilization of rice bran
by domestic heating could be applied to RBO extraction prior to
pressing to improve oil extraction yield, quality and antioxidant
properties of cold-pressed RBO. Hot air and microwave heating
were the most effective methods for stabilization of rice bran with
a high extraction yield, and lowering of AV, FFA and PV. Those
heating methods also provided higher contents of total phenolic
compounds, flavonoid and gamma oryzanol while increasing the
antioxidant activities of RBO. However, we suggested that microwave
heating is not economical and not suitable to be used in small
and medium scales in rural areas. But hot air heating is a very
efficient method for stabilization and could be applicable for small
and medium scale operations in rural areas.