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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Potential Applications of HS-SPME/GC in Oxidized Vegetable Oils
Author(s)
Gülgün Yildiz Tiryaki
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DOI:10.17265/2159-5828/2012.05.003
Affiliation(s)
Department of Food Engineering, Faculty of Agriculture, Kahramanmaras Sutcu Imam University, Kahramanmaras 46100, Turkey
ABSTRACT
Headspace solid phase
microextraction chromatography (HS-SPME/GC) was evaluated as a tool in
determining the rate of oxidation in oxidized soybean oil samples by measuring
the production of hexanal as a secondary major volatile breakdown product of
linoleic acid. Samples of the headspace taken from sealed 20 mL vials,
incubated 30 min at 50 °C followed by 5 min adsorption, were injected into a
gas chromatograph with 2 min thermal desorption. In applying SPME, different
analytical conditions were evaluated. The linearity of response of the
volatiles for the HS-SPME/GC procedure using a carboxen-polydimethylsiloxane
fiber was determined from 3 g of mineral oil spiked with a hexanal standard
solution at different levels. Using the optimized extraction conditions, an R value close to unity (R = 0.999) was found, and the repeatability (n = 11) was 6.31%. The
results indicated that hexanal is linearly related to peroxide value (PV) only
intermediate PV ranges (10-18 meq/kg). The study also showed that HS-SPME/GC
procedure was a simple and reproducible method for the analysis of hexanal in
the HS of commercial soybean oil samples, and is useful as a quality control
and research tool for the evaluation of flavor quality and shelf life of
vegetable oils.
KEYWORDS
Hexanal, headspace, GC, solid phase microextraction, peroxide value, oxidation, vegetable oil.
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