A Next-generation Sequencing Approach for the Detection of Mixed Species in Canned Tuna

Overview

Journal Food Chem X

Date 2023 Feb 27

PMID 36845509

Authors

Regina Klapper

Amaya Velasco

Maik Doring

Ute Schroder

Carmen G Sotelo

Erik Brinks

Marta Munoz-Colmenero

Affiliations

Soon will be listed here.

Abstract

Tuna cans are relevant seafood products for which mixtures of different tuna species are not allowed according to European regulations. In order to support the prevention of food fraud and mislabelling, a next-generation sequencing methodology based on mitochondrial cytochrome and control region markers has been tested. Analyses of defined mixtures of DNA, fresh tissue and canned tissue revealed a qualitative and, to some extent, semiquantitative identification of tuna species. While the choice of the bioinformatic pipeline had no influence in the results (p = 0.71), quantitative differences occurred depending on the treatment of the sample, marker, species, and mixture (p < 0.01). The results revealed that matrix-specific calibrators or normalization models should also be used in NGS. The method represents an important step towards a semiquantitative method for routine control of this analytically challenging food matrix. Tests of commercial samples uncovered mixed species in some cans, being not in compliance with EU regulations.

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