Effect of Some Transition Metals on the Monolayer Oxidation of Methyl Linoleate

Methyl linoleate was deposited as a monolayer on a silica gel control and on silica gel supplemented with double or quadruple the control’s amount of the transition metal ions (TMI) iron, copper, vanadium or titanium. The treatments were oxidized at 25 °C, and periodically samples were examined for...

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Bibliographic Details
Published in:Journal of the American Oil Chemists' Society 2011-11, Vol.88 (11), p.1845-1848
Main Authors: Koprucuoglu, Yasemin, Calikoglu, Eda, Tekin, Aziz, Hammond, Earl G
Format: Article
Language:English
Subjects:
Agriculture
Biological and medical sciences
Biomaterials
Biotechnology
Chemistry
Chemistry and Materials Science
Chromatography
copper
Fat industries
Food industries
Food Science
Free radicals
Fundamental and applied biological sciences. Psychology
Gas chromatography
Industrial Chemistry/Chemical Engineering
iron
Kinetics
Letter to the Editor
metal ions
Metals
Methyl linoleate
Oxidation
Oxidation products
peroxide value
Silica
silica gel
Surface oxidation
Titanium
Transition metal ions
Vanadium
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Summary:Methyl linoleate was deposited as a monolayer on a silica gel control and on silica gel supplemented with double or quadruple the control’s amount of the transition metal ions (TMI) iron, copper, vanadium or titanium. The treatments were oxidized at 25 °C, and periodically samples were examined for peroxide values (PV) and by gas chromatography for oxidation products (GC). Comparison of the treatments revealed that: Surface oxidation on silica gel owes its high rate to TMI, which may speed free radical initiation. Epoxidation is catalyzed by the presence of vanadium and titanium. Scission products (SP) and unrecovered mass increased with the extent of oxidation probably because of increased free radical life time.
ISSN:0003-021X
1558-9331
DOI:10.1007/s11746-011-1833-9