Rate of inactivation curves for the "free" toxin, prototoxin, or activated toxin in crude filtrates of Clostridium botulinum type E were nonlinear, consisting of a fast inactivating rate followed by a slow inactivating rate. Thermodynamic parameters were calculated over a temperature range of 125 to 145 F (51.7 to 62.8 C) for the two different inactivation rates. Energy of activation was low at the lower temperature and high at the higher temperature. The thermal requirement for inactivating similar concentrations of the "free" toxin, prototoxin, or activated toxin was considered to be the same.
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Licciardello et al. (1967) studied this question.
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