High hydrostatic pressure (HHP) pretreatment affected the physical properties of dried apples by
modifying colour, density and porosity and by inducing shrinkage. Convective drying of apples cubes
after HHP pretreatment resulted in a statistically significant changes in tissue colour compared to the raw
apples tissue, with a tendency for darkening, where L varies in the range from 10.4 (raw dried apples) to
49.7% depending on the applied pressure and type of the solution. The use of the hypertonic solution
during pretreatment at pressures of 0.1 and 300 MPa caused that the DE values were lower respectively
by 10.5% and 16% than those for apples tissue pretreated in the isotonic solution. The shrinkage of apples
tissue ranged from 70 to 89% and was determined by parameters of the HHP pretreatment. The dried
products obtained after high pressure pretreatment of apples in the solutions were characterized by
higher density and shrinkage. In turn, apples porosity was lower compared to the products obtained by
convective drying with HHP pretreatment but without solution. Values of both total and closed porosity
of the dried products were changing depending on the applied parameters of pretreatment and fitted
within a very wide range from 1 to 66%.