Journal ArticleDOI
A rapid microozonolysis-GLC procedure for locating unsaturation in olefinic acids, including trienes and tetraenes
TLDR
In this article, the Stein-Nicolaides procedure was used for the identification of unknown olefinic fatty acids by ozonolysis of monoenoic esters.Abstract:
Increased versatility has been achieved in the identification of unknown olefinic fatty acids by ozonolysis. The method has been applied to purified methyl esters containing up to four double bonds. Aldehydic fragments, obtained from esters by the Stein-Nicolaides procedure (2), were determined by GLC on two columns of different polarity. Equivalent chain lengths of each fragment on the two columns provide identification. For monoenoic esters the location of the double bond is clearly indicated by the aldehyde and aldehyde-ester fragments. Dienes are identified by the aldehyde and aldehyde-ester fragments when the original chain length of the ester is known; the dialdehyde fragment provides confirmatory evidence. Trienes and tetraenes are analyzed by interrupting the ozonolysis at various times, thereby producing unsaturated, as well as saturated, aldehydes and aldehyde-esters. Unsaturated fragments locate the central or interior double bonds.read more
Citations
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Journal ArticleDOI
Lipid composition of selected margarines
D. L. Carpenter,Hal T. Slover +1 more
TL;DR: Results of analytical studies on the composition of 10 selected margarines representative of consumeravailable hard and soft types are presented and the forms of tocopherol found were characteristic of the original vegetable oils.
Journal ArticleDOI
Distribution of Isometric Octadecenoic Fatty Acids in Milk Fat
TL;DR: Fat from perirenal and subcutaneous adipose tissue of a dairy cow had composition similar to that of butter samples, and there was no obvious seasonal variation in the distribution pattern.
Journal ArticleDOI
Structural determination and uses of jojoba oil
TL;DR: The most common molecular species in jojoba oil is cis-13-docosenylcis-11-eicosenoate (erucyl jojobenoate), ranging from 31% to 45% of the extracted seed oil as discussed by the authors.
Journal ArticleDOI
Jojoba oil analysis by high pressure liquid chromatography and gas chromatography/mass spectrometry
TL;DR: Two analytical procedures for determining com-positions of jojoba liquid wax esters are described and compared in this paper, where double bonds in the alkyl chains in JoJo liquid waxes were almost exclusively (98%) ω-9, when examined by gas chro-matography/mass spectrometry (GC/MS) and ozonolysis/ GC/MS.
References
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Journal ArticleDOI
Gas chromatographic characterization of fatty acids.Identification constants for mono- and dicarboxylic methyl esters
Journal ArticleDOI
Periodate–permanganate oxidations: i. oxidation of olefins
R. U. Lemieux,E. Von Rudloff +1 more
TL;DR: In this paper, it was discovered that olefinic double bonds are readily oxidized in an aqueous solution of periodate which contains only catalytic amounts of permanganate.
Journal ArticleDOI
Rapid determination of olefin position in organic compounds in microgram range by ozonolysis and gas chromatography. Alkylidene analysis
Morton Beroza,B. A. Bierl +1 more