A1 Refereed original research article in a scientific journal

Docosahexaenoic acid in regio- and enantiopure triacylglycerols: Oxidative stability and influence of chiral antioxidant




AuthorsDamerau Annelie, Ahonen Eija, Kortesniemi Maaria, Gudmundsson Haraldur G, Yang Baoru, Haraldsson Gudmundur G, Linderborg Kaisa M

PublisherElsevier BV

Publication year2023

JournalFood Chemistry

Journal acronym Food Chem

Article number134271

Volume402

DOIhttps://doi.org/10.1016/j.foodchem.2022.134271(external)

Web address https://doi.org/10.1016/j.foodchem.2022.134271(external)

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/177003172(external)


Abstract

Docosahexaenoic acid (DHA) is essential for health but easily oxidized. Yet the influence of DHA’s exact location (sn-1, sn-2, or sn-3) in triacylglycerols on oxidative stability is currently unknown. This is the first study comparing oxidative stability of DHA in regio- and enantiopure triacylglycerols with or without RRR-α-tocopherol. Headspace solid-phase micro-extraction with gas chromatography–mass spectrometry, liquid chromatography–mass spectrometry, and nuclear magnetic resonance spectroscopy were applied. DHA in sn-2 was the most stable with or without added RRR-α-tocopherol resulting in differences in hydroperoxide formation. Without antioxidant, stability of DHA in sn-1 and sn-3 was mainly similar, with slight tendency towards better stability in sn-3. With RRR-α-tocopherol higher stability in sn-1 compared to sn-3 was observed. This points to diastereomeric interactions between RRR-α-tocopherol and DHA in sn-1. These results are highly relevant for enzymatic restructuring processes of DHA-rich fish or microalgae oil concentrates aimed for food supplements or food fortification.


Downloadable publication

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.





Last updated on 2024-26-11 at 22:15