Characterization of fatty acid isomers in dehydrated castor oil by gas chromatography and gas chromatography-mass spectrometry techniques

Fatty acid isomers present in dehydrated castor oil were analyzed by gas chromatography and gas chromatography‐mass spectrometry (GC‐MS) of their dimethyl oxazoline derivatives. Conjugated linoleic acid 9,11 and 10,12 isomers were identified by GC based on equivalent chainlengths. Segmental peak ana...

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Bibliographic Details
Published in:Journal of the American Oil Chemists' Society 1998-10, Vol.75 (10), p.1297-1303
Main Authors: Ramamurthi, S. (Hindustan Lever Research Centre, East, Mumbai, India.), Manohar, V, Mani, V.V.S
Format: Article
Language:English
Subjects:
4,4‐dimethyloxazoline derivative
ACEITE DE RICINO
ACIDE GRAS
ACIDOS GRASOS
Acids
Applied sciences
CASTOR OIL
Chemical industry and chemicals
Chromatography
Composition, physical and chemical properties
conjugated dienes
conjugated linoleic acid
dehydrated castor oil
Dehydration
Elution
Exact sciences and technology
FATTY ACIDS
Gas chromatography
GC‐MS
HUILE DE RICIN
Isomers
Linoleic acid
Mass spectrometry
Mass spectroscopy
Oils and fats
Scientific imaging
segmental peak analysis
SPA
Spectroscopy
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Summary:Fatty acid isomers present in dehydrated castor oil were analyzed by gas chromatography and gas chromatography‐mass spectrometry (GC‐MS) of their dimethyl oxazoline derivatives. Conjugated linoleic acid 9,11 and 10,12 isomers were identified by GC based on equivalent chainlengths. Segmental peak analysis of GC‐MS total ion chromatogram mass fragmentation pattern revealed the presence of 7,9 and 8,10 conjugated linoleic acids along with 9,11 and 10,12 conjugated linoleic acids. Interestingly, a reverse elution of trans, trans‐conjugated linoleic acids was observed, viz. 10,12 was followed by 9,11, which was in turn followed by the 8,10 and 7,9 isomers. The observed reverse order of elution was in contrast to the conventional elution pattern of both nonconjugated and conjugated cis,cis‐, cis,trans‐ and trans,cis‐isomers.
ISSN:0003-021X
1558-9331
DOI:10.1007/s11746-998-0175-8