Analytical separation of the methyl esters of the c8-c34 straight-chain fatty acids and the detection of odd-carbon-number acids in commercial mixtures of fatty acids by gas chromatography

2007 ◽  
Vol 8 (9) ◽  
pp. 549-552 ◽  
Author(s):  
M. A. Khan ◽  
B. T. Whitham
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Methyl Esters ◽  
Carbon Number ◽  
Straight Chain ◽  
Analytical Separation ◽  
Chain Fatty Acids

THE EFFECTS OF CHAIN LENGTH ON THE INFRARED SPECTRA OF FATTY ACIDS AND METHYL ESTERS

1962 ◽  
Vol 40 (2) ◽  
pp. 321-333 ◽  
Author(s):  
R. Norman Jones
Keyword(s):  
Fatty Acids ◽  
Carbon Tetrachloride ◽  
Chain Length ◽  
Infrared Spectra ◽  
Comparative Studies ◽  
Carbon Disulphide ◽  
Methyl Esters ◽  
Straight Chain ◽  
Group Frequency ◽  
Chain Fatty Acids

The infrared spectra of straight-chain fatty acids and their methyl esters have been measured over the range 1500–650 cm−1 in carbon tetrachloride and carbon disulphide solution. The effects of the chain length on the peak intensities of the bands have been analyzed in relation to the group frequency assignments derived from comparative studies of deuterium-substituted methyl laurates.

scholarly journals Separation of Saturated Straight Chain Fatty Acids. Qualitative Paper Chromatography.

1955 ◽  
Vol 9 ◽  
pp. 864-865 ◽  
Author(s):  
Olavi Perilä ◽  
Rolf Gmelin ◽  
Ivan Larsen ◽  
Ole Lamm
Keyword(s):  
Fatty Acids ◽  
Paper Chromatography ◽  
Straight Chain ◽  
Chain Fatty Acids

scholarly journals The Peroxisomal Acyl-CoA Thioesterase Pte1p fromSaccharomyces cerevisiaeIs Required for Efficient Degradation of Short Straight Chain and Branched Chain Fatty Acids

2006 ◽  
Vol 281 (17) ◽  
pp. 11729-11735 ◽  
Author(s):  
Isamu Maeda ◽  
Syndie Delessert ◽  
Seiko Hasegawa ◽  
Yoshiaki Seto ◽  
Sophie Zuber ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Straight Chain ◽  
Branched Chain Fatty Acids ◽  
Branched Chain ◽  
Chain Fatty Acids

THE NORMAL C17 FATTY ACIDS OF MUSK-OX FAT

1957 ◽  
Vol 35 (12) ◽  
pp. 1434-1437 ◽  
Author(s):  
Mary J. Chisholm ◽  
C. Y. Hopkins
Keyword(s):  
Fatty Acids ◽  
Melting Point ◽  
Mixed Melting Point ◽  
Methyl Esters ◽  
Heptadecanoic Acid ◽  
X Ray Diffraction ◽  
Straight Chain ◽  
Trans Form ◽  
Total Fatty Acids ◽  
Musk Ox

A sample of body fat of the Canadian musk ox (Ovibosmoschatus subsp.) was converted to methyl esters and distilled. The fraction containing esters of C17 acids was crystallized fractionally at low temperature and two straight-chain C17 acids were isolated. n-Heptadecanoic acid was identified by analysis, by mixed melting point of the acid and two derivatives with authentic samples, and by its X-ray diffraction pattern. 9-Heptadecenoic acid was identified by analysis, by mixed melting point of two derivatives with authentic samples, and by oxidative cleavage. It is estimated that the fat contained 1.7% of n-heptadecanoic acid and 0.9% of cis-9-heptadecenoic acid, based on the total fatty acids. Although there was an appreciable content of trans acids in the fat, the heptadecenoic acid was found to contain little or none of the trans form.

A Method for the Determination of the Structure of Saturated Branched-Chain Fatty Acids

1959 ◽  
Vol 12 (4) ◽  
pp. 657 ◽  
Author(s):  
KE Murray
Keyword(s):  
Fatty Acids ◽  
Carbon Number ◽  
Carbon Chain ◽  
Octadecanoic Acid ◽  
Cyclopropane Fatty Acids ◽  
Branched Chain Fatty Acids ◽  
Tuberculostearic Acid ◽  
Branched Chain ◽  
Chain Fatty Acids

A method is described for the determination of the structure of branched-chain fatty acids. It is found that the carbon chain of methyl-branched acids can be readily degraded by potassium permanganate in acetone, to give a series of acids of decreasing carbon number. Where a branch occurs the acid series is interrupted and a methyl ketone, of the same carbon number as a missing acid, is produced. Gas chromatographic examination of the ketone(s) and esterified acids gives clear evidence for the location of the branch(es). The method is illustrated by application to tuberculostearic acid (10-methyl-octadecanoic acid) and C27-phthianoic acid (2,4,6-trimethyltetracosanoic acid). It appears also able to decide the location of the ring in cyclopropane fatty acids.

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