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Pulsed low resolution NMR was used to study the hydration mechanism of powdered milk samples. The non-exponentiality of the spin-echo decay curves of water was exploited to determine the water mobility, as well as the relative abundance of bound and free water in the different samples. The analysis of the experimental curves was performed by assuming a chemical exchange between bound and free water.
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Brosio et al. (1983) studied this question.
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