| Author | Gan, Yuxin |
| Call Number | AIT Thesis no. AE-97-8 |
| Subject(s) | Rice oil
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Engineering, School of Environment, Resource and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Two types of rice bran, namely white rice bran and parboiled rice bran, were used for
oil extraction. Optimum extracting conditions were determined with hexane, subcritical C02
and supercritical C02.
Ratio of hexane: rice bran was 90 ml: 2 gram when using Soxtec extract machine.
Optimum pa1ticle size was 0.125 mm. For parboiled rice bran, maximum yield as high as
26.01 % was obtained at temperatme of 140 °C, 4 hours. White rice bran had highest oil yield
(21.74%) at 140 °C, 5 hours. Extraction model shows that white rice bran has slower
extracting rate than parboiled rice bran.
Optimum extraction temperature for subcritical C02 was 35 °C, when pressure fixed at
55 bar, with maximum yield being 16.08% after 8 hours of extraction. Optimum temperatme
and pressure for supercritical C02 was 65 °C and 300 bar. Extraction time is sh01tened to only
2 hours. 17 .27% of rice bran oil was obtained at optimum condition.
Rice bran oil extracted by subcritical C02 and supercritical C02 have higher quality in
flavor and color. Acid value of subcritical C02 and supercritical C02 is close to refined oil. a
tocopherol content in oil product that were extracted with subcritical C02 and supercritical
C02 were lower than crude oil extracted with commercial hexane, but much higher than
refined oil. |
| Year | 1997 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Athapol. Noomhorm.; |
| Examination Committee(s) | Jindal, V. K. ;Vincent, Jean Claude; |
| Scholarship Donor(s) | Government of Denmark (DANIDA) ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1997 |