Below-zero storage of fish to suppress loss of freshness
2019
Yoshioka, T. (Hokkaido Industrial Technology Center, Hakodate, Hokkaido (Japan)) | Konno, Y. | Konno, K.
The decomposition of ATP in flounder and greenling muscle were compared at 0 and -2℃. The decomposition of inosine-5-monophosphate (IMP) and subsequent increase in the K-value were suppressed at -2℃ for both species, although the K-value increased much more slowly for flounder than for greenling. When flounder was stored at 0℃, a high IMP content was maintained for more than 10 days, and then dropped quickly. This quick reduction in the IMP content was not observed at -2℃. The fast reduction in the IMP content at 0℃ was explained by the activity of an IMP-decomposing enzyme produced by spoilage microorganisms; it no longer occurred when the meat was stored in the presence of 150 p.p.m. of the antibiotic chloramphenicol. 5′-Nucleotidase produced by the bacteria was less stable than that produced endogenously. Spoilage bacteria also produced a strong protease that degraded muscle protein. It was concluded that lowering the storage temperature of flounder and greenling from 0 to -2℃ suppressed the growth of spoilage bacteria and slowed the increase in the K-value.
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