Metabolomics and bacterial diversity of packaged yellowfin tuna (Thunnus albacares) and salmon (Salmo salar) show fish species-specific spoilage development during chilled storage

Microbial (colony counts, 16S rRNA gene amplification), chemical (pH, 1 H NMR spectroscopy) and sensory changes in raw Atlantic Salmon (Salmo salar) and tuna (Thunnus albacares) fillets stored under vacuum at 3 °C were evaluated over a period of 12 days. Both species of fish are globally important a...

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Bibliographic Details
Published in:International Journal of Food Microbiology
Main Authors: Jääskeläinen, Elina, Jakobsen, Louise Margrethe Arildsen, Hultman, Jenni, Eggers, Nina, Bertram, Hanne Christine S., Björkroth, Johanne
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
BIOGENIC-AMINES
Fish quality
PORK
PURE
Photobacterium
Pseudomonas
QUALITY
SEQUENCES
SHELF-LIFE
SPP.
VACUUM
Atlantic salmon
Salmo salar
Online Access:https://pure.au.dk/portal/da/publications/metabolomics-and-bacterial-diversity-of-packaged-yellowfin-tuna-thunnus-albacares-and-salmon-salmo-salar-show-fish-speciesspecific-spoilage-development-during-chilled-storage(c4f76587-b041-4318-a8b9-d1dfc8497fed).html
https://doi.org/10.1016/j.ijfoodmicro.2018.12.021
https://pure.au.dk/ws/files/194189563/1_s2.0_S016816051830583X_main.pdf
http://www.scopus.com/inward/record.url?scp=85059767366&partnerID=8YFLogxK
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Summary:Microbial (colony counts, 16S rRNA gene amplification), chemical (pH, 1 H NMR spectroscopy) and sensory changes in raw Atlantic Salmon (Salmo salar) and tuna (Thunnus albacares) fillets stored under vacuum at 3 °C were evaluated over a period of 12 days. Both species of fish are globally important and among the ten most consumed fishes in the world. Although the sensory analyses showed a decrease in the quality of both fish species, only the salmon fillets were considered spoiled at the end of the storage period. In salmon, trimethylamine was the main spoilage product and bacterial colony counts reached an average of 7.3 log10 cfu/g. The concentration of glucose decreased and the concentration of organic acids increased during storage revealing glucose fermentation. Photobacterium was the dominating genus in the salmon studied. In the tuna studied, the bacterial colony counts reached only an average of 4.6 log10 cfu/g. The dominating bacteria in tuna were Pseudomonas spp. Glucose levels did not decrease, suggesting that amino acids and lactate most likely acted as carbon sources for bacteria in tuna. In conclusion, the study revealed that salmon was clearly a more perishable fish than tuna.

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