Abstract
The effects of two heat processing methods (pasteurisation and spray drying) routinely used in the processing of cow's milk and the production of infant formula powder on the selenium (Se) content of liquid milk, milk fortified with sodium selenite and sodium selenate were studied. Pasteurisation reduced intrinsic Se and selenate levels by 7.9% and 6.2% at p < 0.05 level and selenite levels by 7.0% at p > 0.05 level. Se losses following spray drying were 44.8% ( p < 0.001), 11.4% ( p < 0.01) and 10.0% ( p < 0.01) for intrinsic selenium, selenite and selenate fortified milk, respectively. Total Se losses from unprocessed milk following processing (pasteurisation and spray drying) were 49.2% ( p < 0.001), 17.6% ( p < 0.001) and 15.6% ( p < 0.001) for intrinsic selenium, selenite and selenate fortified milk, respectively.
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