Title: Critical evaluation of Non-Thermal Plasma as an innovative accelerated lipid oxidation technique in fish oil
Authors: Vandamme, Jeroen ×
Nikiforov, Anton
Dujardin, Klaas
Leys, Christophe
De Cooman, Luc
Van Durme, Jim #
Issue Date: 2015
Publisher: Published on behalf of the Canadian Institute of Food Science and Technology by Elsevier Applied Science
Series Title: Food Research International
Article number: FOODRES-D-14-03249R1
Abstract: Food products enriched with healthier unsaturated fatty acids are more sensitive to lipid
oxidation, leading to an overall quality deterioration and the development of unwanted aroma
properties. To evaluate the oxidative stability a wide range of techniques has been described in
literature, of which most are thermally based. These unrealistic test conditions result in the induction
of deviating oxidation chemistry compared to that observed during ambient storage. Non-thermal
plasma technology is capable to generate a wide range of highly reactive oxidative species (e.g. atomic
oxygen, hydroxyl radicals, singlet oxygen) while maintaining ambient temperatures. For the first time,
a DBD-plasma jet (Ar/0.6% O2) is used on fish oil samples as a faster and more realistic accelerated
lipid oxidation method. This paper critically evaluates both a thermal as a non-thermal plasma based
accelerated oxidation protocol using naturally aged fish oil as reference. Experiments were done using
both virgin, as alpha-tocopherol-enriched fish oil samples. Secondary lipid oxidation volatiles were
measured using HS-SPME-GC-MS. Both accelerated oxidation techniques induced the formation of
typical lipid oxidation markers (e.g. 2-propenal, (E)-2-pentenal, heptanal), however in both cases
significant differences were observed compared to the naturally aged fish oil. On the other side, nonthermal
plasma correctly predicted an antioxidative effect when 1000 μg/g alpha-tocopherol was
added to the fish oil, while thermally based tests resulted in the induction of prooxidative chemistry.
Despite the differences with naturally aged fish oil, several non-thermal plasma characteristics (reactor
configuration, gas feed mixture, power source, …) can be fine-tuned to evolve towards a technology
that is capable to accelerate lipid oxidation in a highly realistic manner.
ISSN: 0963-9969
Publication status: accepted
KU Leuven publication type: IT
Appears in Collections:Bioengineering Technology TC, Technology Campuses Ghent and Aalst
Technologiecluster Bioengineering Technologie
× corresponding author
# (joint) last author

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