Effect of ohmic heating on oil recovery from rice bran
Abstract
This study describes a new technological method for rice bran oil extraction. The method
deals with the combined effect of ohmic heating and enzyme assisted aqueous oil extraction process
(EAEP) on improvement of oil recovery from Rice bran. The experimental procedure consisted of
following fundamental steps, i.e., wet grinding, enzymatic treatment, ohmic heating, aqueous
extraction and centrifugation. The effect of ohmic heating parameters particularly electric field strength
(EFS), end point temperature (EPT) and holding time (HT) on aqueous oil extraction procedure were
investigated. Three levels of electric field strength (i.e., OH450V, OH550V and OH650V), three levels
of end point temperature (i.e., 75, 85 and 95 °C) and three levels of holding time (i.e., 0, 5 and 10 min.)
were taken as independent variables utilizing full factorial design. Percentage oil recovery from rice
bran by EAEP alone and EAEP combined with ohmic heating had been 71 % and 73.59 % to 82 %
respectively. The maximum oil recovery (82 %) was acquired when the sample was heated and
maintained at 95 °C the usage of electric field strength of OH650V for a holding time of 10 min. The
free fatty acid (FFA) of the extracted oil (i.e. in range of 1.89 to 2.24 %) was within the adequate limit
of 3 % (oleic acid) and 0.5–3 % recommended respectively with the aid of PFA and BIS.
Description
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