The surface area was measured to investigate changes in size depending on the different drying methods. The enrichment by VI implicated no significant particle size changes in contrast to the drying procedures. All drying procedures resulted in sample
shrinkage (Fig. 4). The FD process resulted in the least shrinkage of 8%. Within the MVD process, the apple slices shrank 46.1% from the initial sample size to a surface area of 21.6 cm2 3.3 cm2. The MVD end drying caused 46.4% tissue contraction, when compared to fresh apple slices. AD resulted in the strongest shrinkage of 48.9%.