A1 Refereed original research article in a scientific journal

Changes in the volatile profile, fatty acid composition and other markers of lipid oxidation of six different vegetable oils during short-term deep-frying




AuthorsSalvatore Multari, Alexis Marsol-Vall, Paulina Heponiemi, Jukka-Pekka Suomela, Baoru Yang

PublisherElsevier Ltd

Publication year2019

JournalFood Research International

Journal acronymFood Res. Int.

Volume122

First page 318

Last page329

ISSN0963-9969

eISSN1873-7145

DOIhttps://doi.org/10.1016/j.foodres.2019.04.026

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/40473540


Abstract

Oil deterioration during deep-frying influences the quality of fried foods to a great extent. In this study, the frying performance of six vegetable oils, i.e., hemp, lupin, oat, rapeseed, soy, and sunflower, was evaluated following short-term (60 min) deep-frying of French fries at 180 °C. The frying oils were investigated for fatty acid profile, volatile compound composition, and parameters of oxidative stability, such as iodine, peroxide, and p-anisidine values. The examination showed that the content of ƩPUFA in hemp oil decreased significantly (p < 0.05) after 60 min of deep-frying, although the degree of change was relatively small (close to 1.5%). Similarly, soy oil presented a fatty acid profile prone to oxidation, and generated the highest level of peroxides at the end of the thermal treatment (PV = 16.6 ± 2.3 mEq O2 kg−1). As for the volatile compound composition of the oils, sunflower oil was extensively affected by the deep-frying treatment with a significant decrease (p > 0.05) in total terpenes, accompanied by a considerable rise in total aldehydes. Oppositely, the proportions of MUFA and PUFA of lupin and oat oils remained stable (p > 0.05) during the short-term deep-frying, indicating high stability of these oils. The research provided new data for evaluating the suitability of these oils for household food preparations.


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