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General
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Gamma-oryzanol, isolated from rice bran oil, is a naturally occurring
mixture of plant chemicals called sterols and ferulic acid esters.
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Gamma-oryzanol is an oryzayl alcohol ester of ferulic acid having an
antioxidant action.
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Gamma-oryzanol is a mixture of ferulic acid esters of mainly the
phytosterols campesterol, beta-sitosterol, 24-methyl-cycloartenol and
cycloartenol.
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Gamma
oryzanol is an important biological anti-oxidant present in rice bran oil in
significant quantities.
Process
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Soxhlet
extraction method was the most common technique used in the extraction of
lipid from plant and animal tissues. The extractability of rice bran lipid
using this method has been reported in the range of 18 - 20%.
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The higher
extractability of oryzanol in the present study could be due to the use of
3:2 chloroform: methanol mixture as the extracting solvent, where oryzanol
in both non-polar and polar lipid fractions were extracted.
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During
saponification process, caustic refining of rice bran oil removes the
oryzanol from the oil to the soap stock.
Uses
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Oryzanol
emulsions are used as antioxidants and preservatives for cosmetics and foods
and such emulsions are also effective in preventing colour changes.
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Gamma-oryzanol is effective against climacteric melancholia and the butyric
ester of riboflavin is also effective in preventing arteriosclerosis.
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It is
known to have anti-itching, anti-dandruff and anti-aging properties.
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It is
effective in trading broad range of gastrointestinal disorders including
stress induced gastric and duodenal ulcers.
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Oryzanol
is sold abroad as an agent for body building in humans and for the treatment
of nerve imbalance and disorders of menopause.
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