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The kinetics of bacteriophage inactivation in the medium that is optimal for its storage has been studied at temperatures from 4 to 55 degrees C. The plot of Arrhenius dependence of the constant of inactivation rate consists of the two linear parts with the energies of activation Ea = 25 kcal/mol for 4-37 degrees C and Ea = 91 kcal/mol for 37-55 degrees C. The DNA of inactivated bacteriophage remained mostly in superspiralized form and completely preserved its biological activity as tested by transfection in spheroplasts. The analysis of inactivation kinetics suggests ageing of virions cultivated at 4 degrees C. The addition of watersoluble antioxidant amoxipin did not change the inactivation kinetics. The addition of antioxidant ionol with twin-80 increased the inactivation that was paralleled by the bacteriophage DNA degradation.
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