In this work, ultrasound-assisted aqueous extraction of oil rice
bran was investigated. Key factors affecting ultrasound-assisted
aqueous extraction of rice bran oil were identified. The results
showed that high pH (pH 12) and high temperature (45 C), agitation
speed of 800 rpm and agitation time of 15 min was preferred
for aqueous extraction. Due to the ultrasonic processing, the reaction
process was strengthened rapidly in a certain period of time.
But while the time was too long, cavitation effect would weaken
or even disappear at this time, so the rate of oil extraction could
reduce. The optimum extraction time of 70 min was selected for
ultrasound-assisted extraction of oil from rice bran. Also, the results
showed that the temperature of the solution at ultrasound treatment
is increased the amount of oil extraction decreased. At
ultrasound-assisted aqueous extraction, the yield of rice bran oil
was close to the yield of oil extracted by hexane Soxhlet extraction.
The ultrasound pretreatment has been shown to be effective for
aqueous extracting rice bran oil. Both extraction methods (aqueous
and Soxhlet) gives higher percentage of oil from par boiled rice bran
compared with raw rice bran. This may be due to the fact that parboiling
releases the oil in the grain and results in outward migration
of the oil. With regard to quality, the oil extracted by aqueous process
had a lower content of free fatty acid and lower color imparting
components than the hexane-extracted oil.
In this work, ultrasound-assisted aqueous extraction of oil ricebran was investigated. Key factors affecting ultrasound-assistedaqueous extraction of rice bran oil were identified. The resultsshowed that high pH (pH 12) and high temperature (45 C), agitationspeed of 800 rpm and agitation time of 15 min was preferredfor aqueous extraction. Due to the ultrasonic processing, the reactionprocess was strengthened rapidly in a certain period of time.But while the time was too long, cavitation effect would weakenor even disappear at this time, so the rate of oil extraction couldreduce. The optimum extraction time of 70 min was selected forultrasound-assisted extraction of oil from rice bran. Also, the resultsshowed that the temperature of the solution at ultrasound treatmentis increased the amount of oil extraction decreased. Atultrasound-assisted aqueous extraction, the yield of rice bran oilwas close to the yield of oil extracted by hexane Soxhlet extraction.The ultrasound pretreatment has been shown to be effective foraqueous extracting rice bran oil. Both extraction methods (aqueousand Soxhlet) gives higher percentage of oil from par boiled rice brancompared with raw rice bran. This may be due to the fact that parboilingreleases the oil in the grain and results in outward migrationof the oil. With regard to quality, the oil extracted by aqueous processhad a lower content of free fatty acid and lower color impartingcomponents than the hexane-extracted oil.
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