Candlenut oil

Candlenut oil or kukui nut oil is extracted from the nut of Aleurites moluccanus (Aleurites triloba), the candlenut or kuku'i.

Description

The candlenut tree is widely distributed through Polynesia and Madagascar, and is found in Hawaii, South Asia, and China,[1] and has been introduced into the West Indies.[2] The oil from the nut is of commercial value, and is included in the drying oils and is used as an illuminating oil. Solvent extraction of the oil from the crushed kernel yields a light yellow oil (density 0.92 g/cm3 (0.033 lb/cu in)); when obtained by expression (pressing), the oil may be dark from impurities.[1] Roughly half the weight of the kernel is oil.[2]

A sample of the oil obtained by petroleum extraction had a saponification value of 179.1 (generally 190-205), an iodine number of 155.5 (generally 135-165, as low as 114), and a Reichert value of 2.82.[1] The oil acts as a mild cathartic similar to castor oil, while the cake remaining from pressing also acts as a purgative if ingested.[2]

The oil typically contains 15% oleic acid, 40% linoleic acid, and less than 30% linolenic acid.[3] Analysis of nut oil samples from Polynesia (Hawaii, Tonga) over a 10-year period showed no change in fatty acid composition - that is about 6% palmitic acid, 2-3% stearic acid, 15-18% linoleic acid, and 30-33% linolenic acid. Oils from Maritime Southeast Asia (Indonesia, East Timor) had different unsaturated content, with 20-25% oleic, 34-42% linoleic, and 27-32% linolenic acid, with palmitic and stearic acid contents similar.[4]

Analysis of a different sample of candlenut kernel seed oil from either solvent (hexane soxhlet) or supercritical carbon dioxide extraction showed around 54% stearic acid, 16% oleic acid, 20% linoleic acid, and less than 3% linolenic acid.[5]

Historically, it has been valued as an emollient, and is currently used primarily in skin-care products.[citation needed]

Synonyms

It is also known as Spanish walnut (Jamaica), Belgaum walnut oil (India), and kekune oil (Sri Lanka).[2]

See also

References

  1. ^ a b c Thompson, Alice R. (1913), "Kukui (Candle-Nut) Oil", Ind. Eng. Chem., 5 (8): 644–645, doi:10.1021/ie50056a007
  2. ^ a b c d Wood, George B.; Bache, Franklin; Wood, H. C. Jr.; Remington, Joseph P.; Sadtler, Samuel P. (1899), The dispensatory of the United States of America (18th ed.), Philadelphia : Lippincott, Aleurites, Triloba, Oil of., p.1556
  3. ^ Mindaryani, A.; Rahayu, S. S. (2010). "Epoxidation of candlenut oil". 2010 International Conference on Chemistry and Chemical Engineering. Abstract. doi:10.1109/ICCCENG.2010.5560371. ISBN 978-1-4244-7765-4. S2CID 19478088.
  4. ^ Ako, Harry; Kong, N.; Brown, A. (September 2005), "Fatty acid profiles of kukui nut oils over time and from different sources", Industrial Crops and Products, 22 (2): 169–174, doi:10.1016/j.indcrop.2004.07.003
  5. ^ Norulaini, Nik; Budi, Rahmad; Anuar, Omar; Kadir, MD; Omar, Mohd (2004), "Major Chemical Constituents of Candle Nut Oil extract using Supercritical Carbon Dioxide" (PDF), Malaysian Journal of Pharmaceutical Studies, 2 (1): 61–72

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