The aim of the study was to determine the effect
of different drying methods on selected physical properties of
pomace obtained from purple carrot cv. Deep Purple. Drying was
performed using four methods: convective, microwave-convective,
infrared-convective and freeze-drying. The freeze-dried material
had the lowest apparent density (422 kg m-3), which was
caused by slight shrinkage, and indicated high porosity. Apparent
density was almost three times greater in dried materials produced
using the other drying methods as compared to the freeze-dried
variants. Freeze-dried pomace adsorbed vapour more quickly than
the other dried variants, which was caused by its high porosity and
relatively low degree of structural damage. Rehydration characteristicswere
significantly affected by the dryingmethod. The highest
mass increase and losses of soluble substance were recorded for the
freeze-dried samples. Conversely, the traditional convective drying
method resulted in the lowest mass increase and soluble substance
leaching. A positive linear correlation was found between
the loss of soluble dry substance components and the absorbance of
liquid obtained during rehydration.
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