Research was undertaken to develop improved methods of sanitizing apples contaminated with Escherichia coli. Unwaxed Golden Delicious apples, inoculated with non pathogenic E. coli , were washed with 200 ppm Cl 2 , commercial washing formulations, 5% H 2 O 2 , or combinations of H 2 O 2 with commercial formulations at ca. 20°C or 50°C. Heated commercial formulations achieved a 2.5 log reduction in E. coli load, compared to a 2 log reduction for 200 ppm Cl 2 . However, heated combinations of H 2 O 2 with acidic surfactants achieved a 3–4 log reduction. Residual H 2 O 2 in treated apples dissipated within several hours. These results demonstrate the efficacy of H 2 O 2 in decontaminating apples containing E. coli.
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Sapers et al. (1999) studied this question.
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