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Storage of lactose-hydrolysed dried milk: effect of water activity on the protein nutritional value

Published online by Cambridge University Press:  01 June 2009

Anders Burvall ,
Nils-Georg Asp ,
Agneta Bosson ,
Carmen San José  and
Arne Dahlqvist
Anders Burvall
Affiliation:
Department of Applied Nutrition, Chemical Centre, University of Lund, P.O. Box 740, S-220 07 Land 7, Sweden
Nils-Georg Asp
Affiliation:
Department of Applied Nutrition, Chemical Centre, University of Lund, P.O. Box 740, S-220 07 Land 7, Sweden
Agneta Bosson
Affiliation:
Department of Applied Nutrition, Chemical Centre, University of Lund, P.O. Box 740, S-220 07 Land 7, Sweden
Carmen San José
Affiliation:
Department of Applied Nutrition, Chemical Centre, University of Lund, P.O. Box 740, S-220 07 Land 7, Sweden
Arne Dahlqvist
Affiliation:
Department of Applied Nutrition, Chemical Centre, University of Lund, P.O. Box 740, S-220 07 Land 7, Sweden
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Summary

The retention of the protein nutritional value during storage of lactosehydrolysed dried milk at different water activities (aw) was studied and compared with that of ordinary milk. In the lactose-hydrolysed milk biologically available lysine decreased much more rapidly than in the ordinary milk at all the different aw studied. Thus, at conditions normally accepted for ordinary dried milk (aw ~0·2; moisture ~ 4 %) there was an available lysine loss in the hydrolysed milk of about 25 % after 2 months and about 40 % after 6-months storage at room temperature. This occurred without any visible browning. It is concluded that drying to very low aw (≦ 0·11) is necessary to obtain good stability of the protein nutritional value (PNV) in lactose-hydrolysed milk. The drying, however, must be done so that losses in nutritional value are minimal during that process. It should also be noted that fat oxidation might be a problem at such low aw. A chemical method for available lysine assay (guanidination and assay of homoarginine) gave values in good agreement with the biological evaluations with rats.

Type
Original Articles
Information
Journal of Dairy Research , Volume 45 , Issue 3 , October 1978 , pp. 381 - 389
Copyright
Copyright © Proprietors of Journal of Dairy Research 1978

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