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Photoinduced and thermal oxidation of rapeseed and sunflower oils
Author(s) -
Gromadzka Justyna,
Wardencki Waldemar,
Pawłowicz Roman,
Muszyński Grzegorz
Publication year - 2010
Publication title -
european journal of lipid science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.614
H-Index - 94
eISSN - 1438-9312
pISSN - 1438-7697
DOI - 10.1002/ejlt.201000057
Subject(s) - rapeseed , hexanal , chemistry , sunflower oil , gas chromatography , solid phase microextraction , flame ionization detector , chromatography , peroxide , differential scanning calorimetry , lipid oxidation , thermal oxidation , food science , gas chromatography–mass spectrometry , organic chemistry , antioxidant , mass spectrometry , physics , silicon , thermodynamics
The aim of the present study was to compare oxidative stability of different sunflower and rapeseed oils. Ultra violet (UV) irradiation was used as an accelerator of the oil oxidation process. After UV irradiation, the formed volatile compounds were extracted by headspace solid‐phase microextraction HS‐SPME (DVB/CAR/PDMS fibre) and analysed by gas chromatography coupled with a flame ionization detector (GC/FID). At the same time, the same oil samples were thermally oxidized. The induction periods were determined on the basis of hexanal to 2‐ trans ‐nonenal ratio in the analysed samples. Finally, the obtained results were compared with induction period values obtained through the determination of peroxide and anisidine values, and from the Rancimat method, manostatic test and differential scanning calorimetry (DSC) method. The results obtained using the new method were well correlated with those achieved with the well‐established analytical techniques. The values of the induction period obtained after UV/HS‐SPME/GC/FID were up to three times higher than those from Rancimat, but the correlation between these two methods was on a very good level (correlation coefficient R >0.98). Similar correlation was also observed between these new methods and the DSC or manostatic test. In all cases, better results were obtained for rapeseed oils than sunflower oils.