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Measurement of Water Activity Above 100°C

The method is based on equilibration of the sample with an atmosphere of pure water vapor at constant pressure. Water activity is calculated from the sample temperature at equilibrium. A curve describing X=f(a w ) at constant water vapor pressure (isobar) was established for microcrystalline cellulose and potato starch, within the range 100-150 o C. The precision of the method was evaluated and an empirical model, based on the GAB equation, was developed to fit experimental data. Determination were specifically with isobars at 1 bar, but isobars at other pressures could be determined by modifying the system