Journal of Oleo Science
Online ISSN : 1347-3352
Print ISSN : 1345-8957
ISSN-L : 1345-8957
Oils and Fats
Triterpene Alcohol and Fatty Acid Composition of Shea Nuts from Seven African Countries
Toshihiro AkihisaNobuo KojimaNaoko KatohYuki IchimuraHirohisa SuzukiMakoto FukatsuSteven MaranzEliot T. Masters
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JOURNAL FREE ACCESS

2010 Volume 59 Issue 7 Pages 351-360

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Abstract

The content and composition of triterpene alcohol fractions of the non-saponifiable lipids (NSL) along with the fatty acid composition of the kernel fats (n-hexane extracts) of the shea tree (Vitellaria paradoxa; Sapotaceae) were determined for 36 samples from seven sub-Saharan countries: Cote d’ Ivoire, Ghana, Nigeria, Cameroun, Chad, Sudan, and Uganda. The fat content of the kernels, proportion of NSL in the fats, and triterpene alcohols in the NSL are in the range of 30–54, 2–12, and 22–72%, respectively. The triterpene alcohol fractions contained α-amyrin (1), β-amyrin (2), lupeol (3), and butyrospermol (4) as the major constituents along with minor or trace amounts of ψ-taraxasterol (5), taraxasterol (6), parkeol (7), 24-methylene-24-dihydroparkeol (8), 24-methylenecycloartanol (9), dammaradienol (10), and 24-methylenedammarenol (11). Fatty acid composition is dominated by stearic (28–56%) and oleic (34–61%) acids. Shea butters from West African provenances contained in general higher levels of triterpene alcohols and stearic acid than those from East African provenances. Both stearic acid and total triterpene alcohol contents were significantly correlated to the latitude and elevation of the source population, indicating that higher levels of these compounds are found at higher ambient temperatures.

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© 2010 by Japan Oil Chemists' Society
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