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Abstract
The state diagram of spray dried bovine colostrum powder was constructed by determining its freezing curve (initial freezing point versus solids content), the glass line (glass transition temperature versus solids content), maximal-freeze-concentration conditions [end point of freezing (), and glass transition temperature of maximally-freeze-concentrated solution (
)] by using differential scanning calorimetry. The freezing curve and the glass line were modeled using the Chen equation by incorporating concept of unfrozen water and Gordon-Taylor equation, respectively. The conditions of the maximal-freeze-concentration obtained were −32.14°C (
) and −50.52°C (
), respectively, and the corresponding solids contents were 0.807 and 0.839 kg dry solids/kg samples, respectively. The state diagram of spray dried bovine colostrum powder obtained can be useful for predicting its stability during storage as a function of temperature and moisture content.