The half-life of unpasteurized and pasteurized dried films of Bacillus thuringiensis exposed to a laboratory UV source was 30 and 45 min, respectively. Films of B. thuringiensis containing peroxidase and exposed to UV were significantly more stable than those not containing peroxidase. The findings supported the assumption that sunlight inactivation of entomopathogens probably is caused by peroxide or peroxide radicals produced by the UV irradiation of amino acid (s).
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Ignoffo et al. (1978) studied this question.