Water associated with whey protein investigated by pulsed NMR
1991
Padua, G.W. | Richardson, S.J. | Steinberg, M.P.
Proton longitudinal relaxation rates were determined for whey protein powders and suspensions of solids concentration between 0.01 and 2.0 g solids/g water. Data showed three hydration regions. The relationship between relaxation rate and solids content was investigated for each region. The two-state model with fast exchange was applied to the dilute suspensions and the high-solids regions. This allowed identification of polymer water and free water states in dilute suspensions and also identification of polymer water and capillary water in high-solids preparations. For intermediate-solids mixtures the two-state model was extended to three water states: polymer, capillary and free. These models enabled calculation of the amount of each water state associated with whey protein at a given moisture content.
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