Rice bran oil
Rice bran oil (also known as rice bran extract) is the oil extracted from the germ and inner husk of rice. It is notable for its very high smoke point of 490 °F (254 °C) and its mild flavor, making it suitable for high-temperature cooking methods such as stir frying and deep frying.[1] It is popular as a cooking oil in several Asian countries, including Japan and China.[2][verification needed]
Consumed at room temperature or cooler, rice bran oil is rich in vitamin E, gamma-oryzanol (an antioxidant that is used for many alternative herbal therapies, and may help prevent heart attacks[3]), and phytosterols (compounds believed to help lower cholesterol absorption[4][5]), which may provide associated health benefits.
Rice Bran wax, obtained from Rice Bran Oil is used as a substitute of Carnauba wax, used in shoe creams and shoe polishes.
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[edit] Composition
Rice bran oil contains a range of fats, with 47% of its fats monounsaturated, 33% polyunsaturated, and 20% saturated. The fatty acid composition of rice bran oil is:[6]
| Fatty acid | Percentage |
|---|---|
| Palmitic | 15.0% |
| Stearic | 1.9% |
| Oleic | 42.5% |
| Linoleic | 39.1% |
| Linolenic | 1.1% |
| Arachidic | 0.5% |
| Behenic | 0.2% |
[edit] Cholesterol Reduction
Results of an animal study[7] indicated a 42-percent decrease in total cholesterol with a 62-percent drop in low-density lipoproteins, or LDL cholesterol, when researchers supplemented test subjects' diets with fractionated vitamin E obtained from rice bran oil. Most published results of a small human study with 26 participants in the January 2005 "American Journal of Clinical Nutrition." The test subjects saw a 7-percent decrease in LDL cholesterol with no change in total cholesterol during a 10-week study.[8])
Scientific studies have shown that the antioxidant stability in rice bran oil remains almost constant even when heated at frying temperatures. The study of thermal degradation and antioxidant stability in the oil is carried out by heating the oil to the frying temperature up to 250°C for 0.5, 1, 1.5, 2hrs. The density of rice bran oil is found to be constant throughout the time of heating illustrates there is no molecular changes due to antioxidant activity in the oil.The oxidative stability of rice bran oil was equivalent to or better than soybean, corn canola, cottonseed, and safflower oil in a model system that simulated deep frying conditions.[9])
[edit] Rice bran oil for Menopause
Rice bran oil (aka Gamma Oryzanol) was shown, in Japanese research, to be effective in relieving hot flashes and other symptoms of menopause. Researchers polled women suffering from "climactic disturbance" (commonly known as "hot flashes") and found that 90% of the women found some form of relief after taking a rice bran oil supplement for 4–6 weeks.[10] [11] Rice bran extract in its natural form (a powder) is not easily absorbed by the human body, so it must first be emulsified in to an oil for proper absorption.
[edit] See also
[edit] References
- ^ Tophé Rice Bran Oil Company. "Rice Bran Oil Benefits". http://www.honestfoods.com/topgriloil.html. Retrieved 2007-08-27.[Third-party source needed]
- ^ California Rice Oil Company. "Health Benefits of Rice Bran Oil". http://www.californiariceoil.com/healthbenefits.htm. Retrieved 2006-10-09.[Third-party source needed]
- ^ A.F. Cicero, A. Gaddi (2001). "Rice bran oil and gamma-oryzanol in the treatment of hyperlipoproteinaemias and other conditions". Phytother Res 15 (4): 277–286. doi:10.1002/ptr.907. PMID 11406848. http://www.findarticles.com/p/articles/mi_m0FDN/is_5_6/ai_80490897. Retrieved 2006-10-09.
- ^ Jeanie Lerche Davis (June 7, 2002). "Vegetable Oil Helps Reduce Cholesterol". WebMD. http://www.webmd.com/content/article/36/1809_51716.htm. Retrieved 2006-10-09.
- ^ University of Rochester Medical Center (May 12, 2005). "Can Rice Bran Oil Melt Away Cholesterol?". Science Daily. http://www.sciencedaily.com/releases/2005/05/050512110703.htm. Retrieved 2006-10-09.
- ^ "Rice Bran Oil". http://www.ricebranoil.info/articles/frying.html. Retrieved 2006-10-09.[Third-party source needed]
- ^ Minhajuddin M, Beg ZH, Iqbal J. "Hypolipidemic and antioxidant properties of tocotrienol rich fraction isolated from rice bran oil in experimentally induced hyperlipidemic rats." Food and chemical toxicology. 2005; 43(5):747-53.
- ^ Tracey Roizman, D.C. (April 9, 2011). "Is Rice Bran Oil Healthy?". LiveStrong.com. http://www.livestrong.com/article/416742-is-rice-bran-oil-healthy/#ixzz1OmeIOBhI. Retrieved 2011-06-09.
- ^ http://www.rasayanjournal.com+(2006-10-09). "ANTIOXIDANT STABILITY IN PALM AND RICE BRAN OIL USING SIMPLE PARAMETERS". Science Daily. http://rasayanjournal.com/View-document/322-ANTIOXIDANT-STABILITY-IN-PALM-AND-RICE-BRAN-OIL-USING-SIMPLE-PARAMETERS.html. Retrieved 2011-06-09.
- ^ Ishihara, M; Ito, Y; Nakakita, T; Maehama, T; Hieda, S; Yamamoto, K; Ueno, N (1982). "gamma-oryzanol on climacteric disturbance". Nihon Sanka Fujinka Gakkai zasshi 34 (2): 243–51. PMID 7061906.
- ^ "RICE BRAN EXTRACT, GAMMA ORYZANOL". http://www.drugs.com/npp/gamma-oryzanol.html.
