The above results were compared with previously published
data (Amarasinghe and Gangodavilage, 2004) for rice
bran oil extraction in Sri Lanka using hexane as the solvent
and presented in Table 3. Results are listed in two columns
for each stabilization method. The first column shows % of oil
extracted by aqueous extraction method (this work), whereas
the second column shows the FFA% in oil extracted using
hexane as the solvent (results extracted from Amarasinghe
and Gangodavilage, 2004). Variation of the FFA% for aqueous
extracted oil as a function of bran storage time was negligible
and not presented in the table. Further, Amarasinghe
and Gangodavilage (2004), have observed that the amount
of total oil (oil + FFA) extracted using hexane remains similar
for a given method for all storage times. Therefore, the
reduction in oil% observed in this work is comparable with
the increase in FFA (%) for hexane extracted oil reported by
Amarasinghe and Gangodavilage (2004). Therefore it can be
concluded that the decrease in the % of oil extracted by aqueous
extraction with the storage time is due to the FFA growth
in rice bran. This can be minimized by applying a suitable
method for stabilization of rice bran. Steaming is observed as
the most effective and applicable method of stabilization rice
bran.