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Thermal degradation and isomerisation kinetics of triolein studied by infrared spectrometry and GC-MS combined with chemometrics.

Abstract：

:Triolein, a triglyceride containing oleic acid as the only acid moiety in the glyceride molecules has been isothermally treated at 280, 300, and 325 degrees C in glass vials under nitrogen atmosphere. The products formed during the thermal treatment at each temperature have been analysed both by infrared spectrometry and GC-MS. The GC-MS analysis was performed after derivatisation of the fatty acids into their methyl esters (FAMEs). Chemometric tools were used in determining the concentrations of the main products namely triolein and trieaidin in the thermally treated mixtures. The concentration profiles of the trielaidin formed during thermal treatment at the above three temperatures were used in determining activation energy for the cis-trans isomerisation of triolein. The combined analysis reveals that the thermal treatment induces not only cis-trans isomerisation but also fission and fusion in the molecules. Furthermore, migration of the double bond in oleic and elaidic acids forming cis and trans isomers of the 18:1 acid was also observed. The heat-induced isomerisation in triolein follows a zeroth order reaction with an activation energy 41+/-5 kcal/mol.

journal_name

Chem Phys Lipids

journal_title

Chemistry and physics of lipids

authors

Christy AA,Xu Z,Harrington Pde B

doi

10.1016/j.chemphyslip.2008.12.002

subject

Has Abstract

pub_date

2009-03-01 00:00:00

pages

22-31

issue

1

eissn

0009-3084

issn

1873-2941

pii

S0009-3084(08)00408-8

journal_volume

158

pub_type

杂志文章

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