Comparative Fingerprint Changes of Toxic Volatiles in Low PUFA Vegetable Oils Under Deep-Frying

Abstract

The volatile fraction of three vegetable oils recommended for deep-frying due to their high MUFA:PUFA ratios, namely extra-virgin olive oil, peanut oil and canola oil, was compared before and after frying potatoes, with a particular focus on toxic volatiles. For the purpose, a headspace solid-phase-micro extraction technique coupled with gas chromatography and mass spectrometry was optimized, with semi-quantification achieved using two internal standards. Significant qualitative and quantitative differences were observed, both before and after frying. From a total of 51 compounds, aldehydes were the main group formed after deep-frying, their nature and abundance being highly associated with the initial fatty acid composition, particularly linoleic acid (r 2 = −0.999, p ≤ 0.001). Globally, extra-virgin olive oil revealed fewer formations of unsaturated aldehydes, including toxic ones, and correlated with lower amounts of degradation indicators, as polar compounds (r 2 = 0.998, p ≤ 0.001) and p-anisidine value (r 2 = 0.991, p ≤ 0.001). Despite the similarities in total unsaturation degree between canola and peanut oils, the former presented lower amount of volatiles, including E,E-2,4-decadienal and acrolein, the more toxic ones. These results highlight for the pertinence of volatile analyses to evaluate and compare oil degradation under thermal and oxidative stress, while complementing other degradation indicators. Additionally, the optimized methodology allows a direct comparison of different oil matrices, supporting further developments into more general methods for volatiles quantification, enabling more efficient comparison of results between research teams.

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Acknowledgements

The authors acknowledge the financial support from PRODER (Contract No. 53989), co-financed by FAEDER, and from project UID/QUI/50006/2013-POCI/01/0145/FEDER/007265 with financial support from FCT/MEC through national funds, co-financed by FEDER, under the Partnership Agreement PT2020 and the PhD Grant—SFRH/BD/82285/2011 attributed to CSPS. LMG also acknowledges the financial support from Campus de Excelencia Internacional Agroalimentario (ceiA3) and University of Jaén, from Spain.

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Correspondence to S. Casal.

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L. Molina-Garcia and C.S.P. Santos contributed equally to this work.

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Molina-Garcia, L., Santos, C.S.P., Cunha, S.C. et al. Comparative Fingerprint Changes of Toxic Volatiles in Low PUFA Vegetable Oils Under Deep-Frying. J Am Oil Chem Soc 94, 271–284 (2017). https://doi.org/10.1007/s11746-016-2943-1

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Keywords

  • Deep-frying
  • Volatile fraction
  • Oxidative stability
  • E,E-2,4-decadienal
  • Acrolein
  • Aldehydes
  • HS–SPME–GC–MS