Authentication of vegetable oils by bulk and molecular carbon isotope analyses with emphasis on olive oil and pumpkin seed oil

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Serval ID
serval:BIB_DF3A1160A39E
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Authentication of vegetable oils by bulk and molecular carbon isotope analyses with emphasis on olive oil and pumpkin seed oil
Journal
Journal of Agricultural and Food Chemistry
Author(s)
Spangenberg J.E., Ogrinc N.
ISSN-L
0021-8561
Publication state
Published
Issued date
2001
Peer-reviewed
Oui
Volume
49
Pages
1534-1540
Language
english
Abstract
The authenticity of vegetable oils consumed in Slovenia and Croatia was
investigated by carbon isotope analysis of the individual fatty acids by
the use of gas chromatography-combustion-isotope ratio mass spectrometry
(GC/C/IRMS), and through carbon isotope analysis of the bulk oil. The
fatty acids from samples of olive, pumpkin, sunflower, maize, rape,
soybean, and sesame oils were separated by alkaline hydrolysis and
derivatized to methyl esters for chemical characterization by capillary
gas chromatography/mass spectrometry (GC/MS) prior to isotopic analysis.
Enrichment in heavy carbon isotope (C-13) of th, bulk oil and of the
individual fatty acids are related to (1) a thermally induced
degradation during processing (deodorization, steam washing, or
bleaching), (2) hydrolytic rancidity (lipolysis) and oxidative rancidity
of the vegetable oils during storage, and (3) the potential blend with
refined oil or other vegetable oils. The impurity or admixture of
different oils may be assessed from the delta C-13(16:0) VS. delta
C-13(18:1) covariations. The fatty acid compositions of Slovenian and
Croatian olive oils are compared with those from the most important
Mediterranean producer countries (Spain, Italy, Greece, and France).
Create date
26/09/2012 15:11
Last modification date
29/10/2020 7:23
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