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Preparation and purity of linoleic acid from commercial corn, cottonseed, and safflower oils
Author(s) -
Sreenivasan B.,
Brown J. B.,
Jones E. P.,
Davison V. L.,
Nowakowska Janina
Publication year - 1962
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02631705
Subject(s) - chemistry , linoleic acid , double bond , potassium permanganate , organic chemistry , saponification , chromatography , corn oil , acetone , fraction (chemistry) , fatty acid , food science
Linoleic acid from commercial corn, cottonseed, and safflower oils was prepared by low temperature crystallization using acetone and petroleum ether as solvents; temperatures ranged between 蜢70 and 50C. This method has the advantages of simple equipment and of flexibility in preparatory capacity. The crystalline fraction obtained at 蜢55C was shown to be 舠pure舡 linoleic acid. Isomerization with potassium tertiary butoxide, oxidative cleavage by periodate‐permanganate, and analysis by liquid‐liquid and gas‐liquid partition chromatography were used to ascertain the purity and the presence of isomers in the final product. This fraction was found to contain 90 to 95%, 9,12 dienoic acid; approximately 5% of dienes with the first double bond at the C 8 position and the second bond either at the C 12 or C 13 positions; and small amounts of nonconjugatable 9,15 cis,cis dienes. Linoleic acid from these oils was similar in composition, except that from corn oil showed the presence of diene with the first double bond at the C 11 position.