Rice bran oil

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Rice Bran Oil
Fat composition
Saturated fats
Total saturated25%
Myristic: 0.6%
Palmitic: 21.5%
Stearic: 2.9%
Unsaturated fats
Total unsaturated75%
Monounsaturated38%
Oleic acid58%
Polyunsaturated37%
Omega-3 fatty acidsα-Linolenic: 2.2%
Omega-6 fatty acidsLinoleic: 34.4%
Properties
Food energy per 100 g (3.5 oz)3,700 kJ (880 kcal)
Smoke point232 °C (450 °F)
Iodine value99-108
Acid value1.2
Saponification value180-190
Unsaponifiable3-5

Rice bran oil is the oil extracted from the hard outer brown layer of rice called chaff (rice husk). It is known for its high smoke point of 232 °C (450 °F) and mild flavor, making it suitable for high-temperature cooking methods such as stir frying and deep frying. It is popular as a cooking oil in several Asian countries, including Bangladesh, Japan, India, and China.[1]

Uses[edit]

Rice bran oil is an edible oil which is used in the preparation of vegetable ghee. Rice bran wax, obtained from rice bran oil and palpanese extract, is used as a substitute for carnauba wax in cosmetics, confectionery, shoe creams, and polishing compounds.

Isolated γ-oryzanol (Chinese: 谷维素) from rice bran oil is available in China as an over-the-counter drug,[2] and in other countries as a dietary supplement.

Composition[edit]

Rice bran oil has a composition similar to that of peanut oil, with 38% monounsaturated, 37% polyunsaturated, and 25% saturated fatty acids.

A component of rice bran oil is the antioxidant γ-oryzanol, at around 2% of crude oil content. Thought to be a single compound when initially isolated, it is now known to be a mixture of steryl and other triterpenyl esters of ferulic acids.[1] Also present are tocopherols and tocotrienols (two types of vitamin E) and phytosterols.

The fatty acid composition is:[1]

Fatty acid Numbering Percentage
Myristic acid C14:0 0.6%
Palmitic acid C16:0 21.5%
Stearic acid C18:0 2.9%
Oleic acid (an omega-9 fatty acid) C18:1 38.4%
Linoleic acid (LA, an omega-6 fatty acid) C18:2 34.4%
α-Linolenic acid (ALA, an omega-3 fatty acid) C18:3 2.2%

Physical properties of crude and refined rice bran oil[3][4]

Property Crude rice bran oil Refined oil
Moisture 0.5-1.0% 0.1-0.15%
Density (15 °C) 0.913-0.920 0.913-0.920
Refractive index 1.4672 1.4672
Iodine value 85-100 95-104
Saponification value 187 187
Unsaponifiable matter 4.5-5.5 1.8-2.5
Free fatty acids 5-15% 0.15-0.2%
oryzanol 2.0 1.5-1.8
Tocopherol 0.15 0.05
Color (tintometer) 20Y+2.8R 10Y+1.0R

See also[edit]

References[edit]

  1. ^ a b c Orthoefer, F. T. (2005). "Chapter 10: Rice Bran Oil". In Shahidi, F. (ed.). Bailey's Industrial Oil and Fat Products. 2 (6 ed.). John Wiley & Sons, Inc. p. 465. ISBN 978-0-471-38552-3. Retrieved 2012-03-01.[dead link]
  2. ^ "National Drug Standard for 谷维素片 / Oryzanol Tablets (DRAFT)" (PDF). 国家食品药品监督管理总局. Archived from the original (PDF) on 29 July 2018. Retrieved 29 July 2018.
  3. ^ "What is Rice Bran Oil". A. P. Refinery.
  4. ^ SEA HandBook. The Solvent Extractors' Association of India. 2009.