Abstract
Fish freshness can be assessed through K values, but this method has a number of limitations, including a complex procedure and destructive sampling. With the aim to develop a convenient method of assessing fish freshness, we measured the changes in K values (up to 40%) and bio-impedance (Z value; frequency 2, 5, 20, 50, 100 kHz) of ordinary muscle in fish of eight marine species, all caught in the East China Sea, during ice storage and examined their relationships. The results indicated that the K value in all fishes increased linearly with storage time, while their Z value decreased only after 24 h of storage. Moreover, after 24 h of storage and at K values of < 40%, impedance ratios at 2–100 kHz (C value, C = Z2 kHz/Z100 kHz) were significantly correlated (p < 0.05) with both storage time and K values in all fishes. These findings suggest that the bio-impedance ratio effectively reflects the change in ATP-related compounds of fish and that a convenient, nondestructive method using the C value can be used instead of the complicated K value measurement to assess the freshness of marine fishes after 24 h of ice storage.
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Acknowledgements
This research was funded by the Agriculture, Forestry and Fisheries Research Council, Ministry of Agriculture, Forestry and Fisheries (Research and development projects for application in promoting new policy of Agriculture Forestry and Fisheries, ID: 10101878). We thank Professor Cyril Glenn Perez Satuito, Nagasaki University, for reviewing this manuscript. We also thank the help provided by the China Scholarship Council to PY.
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Yuan, P., Wang, Y., Miyazaki, R. et al. A convenient and nondestructive method using bio-impedance analysis to determine fish freshness during ice storage. Fish Sci 84, 1099–1108 (2018). https://doi.org/10.1007/s12562-018-1256-8
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DOI: https://doi.org/10.1007/s12562-018-1256-8