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Oxidative stability of iron fortified goat and cow milk and their peptide isolates
A Smialowska1, L Matia-Merino1, A J Carr1
1Massey Institute of Food Science and Technology, School of Food and Nutrition, Massey University, Palmerston North, New Zealand.
Abstract:
The oxidation potential of iron fortified goat and cow milks and casein phosphopeptides obtained from each species of milk was determined using malondialdehyde as an oxidation product marker. There was a reduction in oxidation when iron was 'bound' to milk or peptides compared to free ferrous sulphate in solution. However, goat milk produced significantly lower amounts of malondialdehyde of 0.46±0.04μgMDA/ml after 3days at 30°C compared to the blank of 1.25±0.16μgMDA/ml. The goat peptides produced non-significantly different levels of malondialdehyde compared to the blank containing no ferrous sulphate.
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