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A quantitative analysis for the measurement of solute water (SOL) in the presence of polymer water (POL) by dielectric measurements was developed. Sucrose, starch and their mixtures at known moisture content and water activity (a w ) were measured. Dielectric constant (K) was relatively insensitive to polymer water (POL) but very sensitive to capillary water (CAP). K was very sensitive to the amount of water in a supersaturated sucrose solution but not to dilution of the saturated solution. A given increment of solute water (SOL) in a mixture gave the same K over the whole a w range, independent of sorbent composition. A model was developed to quantitate SOL in a mixture with POL by measuring K at 1000 KHz.
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Chinachoti et al. (1988) studied this question.
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