Journal
FOOD MICROBIOLOGY
Volume 98, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.fm.2020.103686
Keywords
Dry-cured fish; Storage temperatures; High throughput sequencing; Microbial community; Lipid oxidation
Funding
- National Natural Science Foundation of China [31871869]
- National Key R&D Program of China [2018YFD0901006]
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The study using high-throughput sequencing technique revealed the microbiota composition and dynamic succession of dry-cured black carp during storage, with the impact of storage temperature on microbial diversity confirmed. The levels of acid value, malondialdehyde, and 4-hydroxy-2-hexenal were identified as key factors affecting the microbiota profile.
This study aimed to achieve deeper insights into the microbiota composition and dynamic succession of the drycured black carp during storage using a high-throughput sequencing technique (HTS). The effect of lipid oxidation on microorganisms was also evaluated. Over 651 bacterial genera belonging to 37 phyla were identified. Firmicutes, Proteobacteria and Actinobacteria were the main bacterial phylum, some are highly associated with meat spoilage. Staphylococcus, Macrococcus and Acinetobacter were the most three microbial genera throughout the entire storage period (30 days). Between two different storage temperature, refrigeration at 4 ?C could facilitate maintaining the microbial diversity, while 25 ?C storage led to the formation of dominant microflora and the reduction of community diversity. Canonical correspondence analysis (CCA) showed that acid value (AV), malondialdehyde (MDA) and 4-hydroxy-2-hexenal (HHE) contents were three key environmental factors (oxidation products) affecting the profile of the microbiota. Staphylococcus presented a positive correlation with HHE content, while Macrococcus and Acinetobacter were negatively correlated with HHE content. These results could expand our knowledge on the effect of lipid oxidation on change of microbial distribution, it could also present an guideline to develop advanced storage methods for the vacuum packed dry-cured fish products.
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