Rice is major source of food all over world. Rice bran coat is removed from white rice for consumption purpose. Rice bran contains 15-20% of lipid, which on further processing like extraction becomes as Rice bran oil. Rice bran oil is normally obtained from the bran composite of rice that is removed during the milling process of brown rice to produce white rice, although some extraction processes were developed that occur during the milling process. Commercial rice milling practiced in most of the world does not separate the germ from the bran efficiently, and in many cases unable to separate hull from bran. Thus, what is called rice bran usually contains the germ and parts of the hull and endosperm also.

1. Presented by
Omkar Joshi (18OIL207)
M.Tech (Oils, Oleochemicals and surfactants Technology)
Institute of Chemical Technology, Mumbai
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2. Contents
 Introduction
 Processing of Rice Bran
 Crude oil Refining both Physical and chemical
 Loss of 𝛄- Oryzanol in Alkali Refining.
 Novel Methods for Rice Bran Oil Refining
 Conclusion
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3. Rice bran contains 15-20% of lipid, which on
further processing like extraction becomes
as Rice bran oil.
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4. Branding of Oryzanol rich product
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Fortune Rice Bran Oil Emani Rice Bran Oil

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6. Scope for future growth
 Rice bran Production: 10 MMT
 Rice bran Oil Production~ 5 MMT
 Untapped Potential is nearly 5 MMT
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7. Important Minor Constituent
 Tocols
 Oryzanol
 Phytosterols
 Several tocopherols
 newly discovered policosanol.
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8. γ- Oryzanol
 It is a mixture of esters of ferrulic acid , sterols and
triterpenic alcohols.
 They are again classified as A,B, C.
 γ- Oryzanol A:
 Chemical Name: cycloartenyl ferulate
 Empirical formula: C40H58O4
 Melting Point: 165.2–166.5°C (Ohta & Shimizu, 1957).
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9. Structure
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10. γ- Oryzanol C
 Chemical Name: 24-methylenecycloartanyl ferulate
 Empirical formula: C41H60O4,
 Melting Point: 164–164.5°C (Ohta, 1960).
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11. Structure
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12. Health Benefits of γ- Oryzanol
 increase in amount of good HDL cholesterol
 90% of the women had some relief from hot flashes
during the period of Menopause after taking a
supplement of the purified concentrate for four to six
weeks.
 Good antioxidant stability.
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13. Processing of Rice bran
 Lipases can enhance free fatty acids (FFA =5-25%), To
avoid that stabilization is necessary.
 Ways to stabilize bran:
 Pass through extruder
 Adjustment of pH through weak acids.
 Microwave heating.
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14. Extraction of Crude Oil from Rice
Bran
 Solvent : Hexane
 Pallet diameter : 6-8 mm Increases yield (Orthoefer &
Eastman, 2004).
 Hexane refluxed in a Soxhlet apparatus for three hour
Extraction of 20.21% oil
 supercritical CO2 at 4350 psi (30 MPa) at 35°C
Extraction of 17.98% oil.
 Hexane is best choice (Ramsay et al. 1991).
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15. Crude Oil Refining
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17. Loss of 𝛄- Oryzanol in Alkali
Refining (Vanessa Pestana et.al.2008)
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18. Novel Methods for Rice Bran Oil
Refining
 Simultaneous Degumming and Dewaxing through
Physical refining.
 Super degumming
 Molecular Distillation of Residue from Deodorizer
Distillate.
 Reducing oil losses in alkali refining with help of salt
as de-emulsifier
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19. Simultaneous Degumming and
Dewaxing through Physical
refining.
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(L. Rajam. et.
al. 2005)

20. Minor constituents of Rice bran oil
at different stages (L. Rajam et.
al.2005)
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21.  Reduction of tocopherol content
 Retention of Oryzanol Content
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22. Super Degumming
(Segers et al. (1983) )
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23. Molecular Distillation of Residue
from Deodorizer Distillate.
( Pattong Sawadikiat et. al.2013)
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24.  Molecular Distillation used to separate heat-sensitive
materials based on the differences in molecular
weight, boiling point and vapour pressure (Martins et
al., 2006).
 The MD was operated at the feed temperature of 133 °C
and the pressure of 1.9 Pa in system. ( Pattong
Sawadikiat et. al.2013)
 Useful for high phospatide concentration.
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25. Phytochemical contents, acid value
and fatty acid in different stages(
Pattong Sawadikiat et. al.2013)
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26.  Potential use of Deodorizer Distillate as a raw material
for further production of phytosterol and γ-Oryzanol.
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27. Reducing oil losses in alkali refining
with help of salt as de-emulsifier
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28.  neutralisation carried out for removal of Free fatty acid
(FFA) resulted as soap formation.
 Micelle entraps oil molecule responsible for loss.
 Salt like NaCl, KCl, Na2SO4 and Tannic Acid used as
de emulsifier.
 Salt breaks emulsion and remove entrapped
oil(Aryusuk K. et. al. 2008).
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29. Conclusion
 Physical Refining is much better way than alkali
refining method for rice bran oil.
 Soapstock formation avoided leading to no cost of
disposal.
 Higher the FFA, Higher oil loss.
 Higher the Viscosity, Higher oil loss.
 Salt act as deemulsifier and recover entrapped oil
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