Datingrams between mug transition temperature (T
To determine the relationship between Tg and heat resistance (log reduction) of S. enterica serovars, we illustrate both the relationship as shown in Fig 4. There seems to be Tg dependency on heat resistance, which means bacterial inactivation effect increases with decrease in Tg for the tested S. enterica serovars except for S. Stanly. The correlation coefficient of S. Typhimurium, S. Chester, S. Oranienburg, S. Stanley, and S. Enteritidis is -0.54, -0.75, -0.80, 0.01, and -0.99, respectively. g plays an important role in heat resistance of S. enterica cells in dry conditions.
g) and inactivation effect (log reductions) of Salmonella Typhimurium (0, solid line), S. Chester (?, dashed line), S. Oranienburg (?, dotted line), S. Stanley (?, fine dotted line), and S. Enteritidis (?, dot dashed line).
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Previous studies have reported that aw has some influence on bacterial survival. Long-term survival of bacteria was demonstrated in low-aw conditions (? 0.87 aw), whereas bacterial death was promoted in high aw conditions [17,23,24]. The relationship between bacterial cell Tg and aw is likely a major factor influencing differences in survival across a range of aw levels. The Tg of Salmonella tested at aw ? 0.87 was 30°C or higher in the present study. These cells would be in a glass state under room temperature conditions, because room temperature (normally 20–22°C) is lower than those of Tg (30°C). In a glass state, the molecular movement in bacterial cells is almost stopped and, thus, unlikely to be affected by external environments. It is inferred that bacteria acquire desiccation tolerance by glass transition accompanying a decrease in aw. Under high-aw conditions, it is presumed that Tg would be considerably low, glass transition would not occur, and the rubber state would be maintained. Since molecular movement is not limited in the rubber state, bacterial cells would not acquire desiccation tolerance https://datingranking.net/pl/eastmeeteast-recenzja/.