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Dadun > Depósito Académico > Facultad de Farmacia > Departamento de Ciencias de la Alimentación, Fisiología y Toxicología > DA - Farmacia - CAFT - Artículos de revista >

Determination of non-polar and mid-polar monomeric oxidation products of stigmasterol during thermo-oxidation
Authors: Menendez-Carreño, M. (María)
Ansorena, D. (Diana)
Astiasarán, I. (Iciar)
Piironen, V. (Vieno)
Lampi, A.M. (Anna-Maija)
Keywords: Thermo-oxidation
Issue Date: 2010
Publisher: Elsevier
Publisher version:
ISSN: 0308-8146
Citation: Menéndez-Carreño M, Ansorena D, Astiasarán I, Piironen V, Lampi A. Determination of non-polar and mid-polar monomeric oxidation products of stigmasterol during thermo-oxidation. Food Chem. 2010 9/1;122(1):277-284.
Oxidation products of stigmasterol were characterised by their polarity and molecular size using solid phase extraction (SPE) and high-performance size exclusion chromatography (HPSEC) methods. Monomeric oxides were studied further by GC–MS and GC–FID. The focus was on identifying and quantifying non-polar and mid-polar monomeric oxides after SPE fractionation. Commercial stigmasterol was subjected to 180 °C up to 3 h. Six oxidation products were identified by GC–MS in the non-polar and mid-polar monomeric fractions; all appeared during the first hour of heating. Quantification by GC–FID showed an increase in the non-polar and mid-polar oxidation products during the heating time, and their amounts reached values of 6.1 and 47.0 g/kg of commercial stigmasterol, respectively. Polar oxidation products commonly measured reached a value of 193 g/kg after 1 h of heating, while after 3 h of heating their concentration was only 164 g/kg. Since as much as 550 g/kg of stigmasterol was decomposed, the monomeric products explained only partly the stigmasterol loss. Dimeric and polymeric products contributed to 165 g/kg of the loss showing the importance of polymerisation reactions at 180 °C.
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