Factors affecting refining losses in rice (Oryza sativa L.) bran oil
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Components of rice bran oil have been assessed for their effect on refining losses. Rice bran oil used in the study had the following (percent) analysis: free fatty acids, 6.8; phosphatides, 1.25; wax, 2.85; monoglycerides, 1.67; diglycerides, 4.84, and oryzanol, 1.85; the rest (80.74) was mostly triglycerides. The phosphatides and mono- and diglycerides had no noticeable effect on refining losses at levels of up to 2% in the oil. Waxes and oryzanol increased the refining losses substantially. In model experiments where these were incorporated into peanut oil individually and in combination, the wax at as low a level as 1% increased the refining losses by about 80% more than control and the refining losses increased with concentration of wax. Oryzanol had a similar effect. When wax and oryzanol were present together in the oil, the effect was synergistic—the refining losses were higher than the sum of their individual effects. Phosphatides, mono- and diglycerides tended to reduce the adverse effect of wax and oryzanol. The main components responsible for higher than normal refining losses in rice bran oil have been identified as wax and oryzanol.
KeywordsFree Fatty Acid Monoglyceride Diglyceride Free Fatty Acid Content Oryzanol
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- 6.Norris, F.A., inBailey’s Industrial Oil and Fat Products, 3rd edn., edited by D. Swern, Interscience Publishers, New York, 1964, p. 728.Google Scholar
- 7.Lynn, L., G.J. Steen, and R.M. Anderson,Food Technol. 22:1250 (1968).Google Scholar
- 8.Commercial Waxes, 2nd edn., edited by H. Bennett, Chem. Publ. Co., Inc., New York, p. 130, 1956.Google Scholar
- 9.Official and Tentative Methods of the American Oil Chemists’ Society, Vol. 1, 3rd edn., edited by W.E. Link, AOCS, Champaign, IL, 1973, Method Ca 9a-52.Google Scholar
- 11.Official Methods of Analysis, Association of Official Analytical Chemists, Washington, DC, 1980, p. 461.Google Scholar
- 12.Official and Tentative Methods of the American Oil Chemists’ Society, Vol. 1, 3rd edn., edited by W.E. Link, AOCS, Champaign, IL, 1972, Method Ca 5a-40.Google Scholar
- 13.Marinetti, G.V.,J. Lipid Res. 3:1 (1962).Google Scholar
- 14.Kumar David, J.S., D. Mrithinjaya Rao, S.D. Thirumala Rao and K.S. Murti,Indian Oil Seeds Journal 8:49 (1964).Google Scholar
- 15.Seetharamaiah, G.S., and J.V. Prabhakar,J. Food Sci. and Technol. 23:270 (1986).Google Scholar
- 17.U.S. Patent 4,1612,260 (1979).Google Scholar