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Transforming Raw Milk into Safe Milk using Electron Beam Processing

By Lindsay Rose Ward


We hypothesized that at low doses (3.5 and ~2.5 log10-reductions for aerobic and anaerobic microorganisms, respectively. At 2.0 kGy eBeam dose, significant reductions in predicted lethality of raw milk associated pathogens can be observed (between 13-logs and 28-logs). QMRA illustrated the significant reductions in infection risks eBeam pasteurization of raw milk can achieve through pathogen elimination. Without eBeam pasteurization, ingestion of raw milk containing ~40 CFU/mL L. monocytogenes or ~10^3 CFU/mL C. jejuni or E. coli O157:H7 would result in ~8/10, ~8/10, or ~10/10 infections for these pathogens, respectively. However, if raw milk is eBeam pasteurized at 2.0 kGy, the infection risks from consumption would be reduced to ~<1/9.735 million persons. Except for vitamin B2 (which showed a 31.57% loss), none of the other targeted nutrients were affected at 2.0 kGy. There was no indication of lipid oxidation after eBeam processing. However, by day 7 of refrigerated storage, there was a 350% increase in lipid oxidation in the 2.0 kGy samples as compared to the non-irradiated samples. There were only minimal changes in the aromatic compound profiles after eBeam processin

Topics: raw milk, electron beam, pathogens, quantitative microbial risk assessment, nutrients, gc-ms
Year: 2017
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