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Summary The bacterial contamination of dried Japanese common squid was effectively controlled by regulating the distribution of two water species retained in a Japanese common squid mantle. The two water species were distinguished as water species-A1, a mobile-water species and water species-A2, a relatively restricted-water species. Water species-A1 and -A2 were effectively characterised by a physicochemical parameter, the correlation time (τC, s), which was evaluated using a proton NMR analysis. The bacterial count was evaluated as a function of τC and the relative humidity (RH), and the results precisely demonstrated the existence of a critical τC (CτC = 10−8 s) at which the water species were divided into species-A1 (region I CτC). Bacterial growth was completely interrupted by species-A2 or by an RH lower than 30% (designated as RH30) at |
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