Comparison of milks processed by the direct and indirect methods of ultra-high-temperature sterilization. II. The sporicidal efficiency of an experimental plant for direct and indirect processing

Franklin, J.G.; Underwood, H.M.; Perkin, A.G.; Burton, H.

J. Dairy Res 37(2): 219-26

1970


DOI: 10.1017/s0022029900013273
Accession: 014391413

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Abstract
The variation of sporicidal efficiency with processing temp, was determined for an experimental UHT milk sterilizer operating alternatively as an indirect or as a direct heater. Whole milk was inoculated with large numbers of spores of Bacillus subtilis 786 and Bacillus slearothermophilus TH24, and the proportion of spores surviving the sterilizing process was calculated from dilution and colony counts on the untreated and treated milk.