Abstract
The water adsorption isotherm at 25°C of freeze-dried amorphous trehalose and trehalose with the addition of maltodextrin (MD) DE 10.9 was obtained. Moisture uptake as a function of time at various relative humidities (RH) was also measured. At low relative humidities (RH) amorphous trehalose adsorbs moisture but at 44% RH and above the isotherm exhibits a plateau indicating crystallisation (formation of the dihydrate) of amorphous trehalose and this was reflected on the shape of the isotherm. Trehalose crystallisation was delayed in the system containing maltodextrin (50: 50) as compared with pure trehalose. © 1997 SCI.
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