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2015 | 13 | 1 |
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Use of ATR-FTIR spectroscopy to detect the changes in extra virgin olive oil by adulteration with soybean oil and high temperature heat treatment

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EN
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EN
The structural changes induced in extra virgin olive oil (EVOO) by adulteration with soybean oil (SBO) and heat treatment at 185°C for 4 and 8 h were investigated using Attenuated Total Reflectance – Fourier Transform Infrared (ATR-FTIR) spectroscopy. Our results revealed that the band around 3006 cm–1 recorded shifts versus the percentage of adulterant. The changes in the absorbance at 3006 cm−1 (A3006) and in the ratio of the maximum heights of the bands at 3006 and 2925 cm−1 (A3006/A2925) were used to evaluate the EVOO adulteration. The regression analysis of A3006 and A3006/A2925 versus the percentage of adulterant was used to calculate the detection limits of adulteration. The time course of spectral changes showed that the oil heating caused notable modifications in the intensity of the absorption bands and induced no shifts in their exact position. The most relevant changes were reflected by conjugation and cis-trans isomerisation of double bonds, the formation of epoxides and widening of the band in the C=O region due to formation of secondary oxidation products. This study highlights that ATR-FTIR spectroscopy may be a promising means to differentiate among pure and adulterated oils and to study the thermooxidative processes in oils undergoing thermal stress.
EN
Wydawca
Czasopismo
Rocznik
Tom
13
Numer
1
Opis fizyczny
Daty
otrzymano
2015-02-06
zaakceptowano
2015-04-02
online
2015-05-25
Twórcy
  • Banat’s
    University of Agricultural Sciences and Veterinary Medicine “King
    Michael I of Romania” from Timisoara, Faculty of Food Processing
    Technology, Calea Aradului 119, 300645 Timisoara, Romania
  • Banat’s
    University of Agricultural Sciences and Veterinary Medicine “King
    Michael I of Romania” from Timisoara, Faculty of Food Processing
    Technology, Calea Aradului 119, 300645 Timisoara, Romania
  • ”Vasile Goldis” Western
    University of Arad, The Faculty of General Medicine, Pharmacy and
    Dental Medicine, Feleacului Street 1, 310396 Arad, Romania
  • ”Vasile Goldis” Western
    University of Arad, The Faculty of General Medicine, Pharmacy and
    Dental Medicine, Feleacului Street 1, 310396 Arad, Romania
  • Banat’s
    University of Agricultural Sciences and Veterinary Medicine “King
    Michael I of Romania” from Timisoara, Faculty of Food Processing
    Technology, Calea Aradului 119, 300645 Timisoara, Romania
  • Banat’s
    University of Agricultural Sciences and Veterinary Medicine “King
    Michael I of Romania” from Timisoara, Faculty of Food Processing
    Technology, Calea Aradului 119, 300645 Timisoara, Romania
Bibliografia
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_1515_chem-2015-0110
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