Effect of some transition metals on the monolayer oxidation of methyl linoleate

Koprucuoglu Y., Calikoglu E., TEKİN A., Hammond E. G.

JAOCS, Journal of the American Oil Chemists' Society, vol.88, no.11, pp.1845-1848, 2011 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 88 Issue: 11
  • Publication Date: 2011
  • Doi Number: 10.1007/s11746-011-1833-9
  • Journal Name: JAOCS, Journal of the American Oil Chemists' Society
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1845-1848
  • Keywords: Kinetics, Methyl linoleate, Oxidation products, Surface oxidation, Transition metal ions
  • Ankara University Affiliated: Yes

Abstract

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. © AOCS 2011.