Due to the drying procedures, the moisture content and the
water activity fell most significantly. The moisture content
decreased to 6.8% after FD, to 9.0% after MVD and to 12.7% after AD.
For the first 5 h of the AD process a continuous weight reduction up
to 72.4% of the apple slice start weight was observed. The majority
of the water removal occurred during the first 7.5 h. The air dried
samples lost 84.4% of their start weight. The end drying phase
resulted in a minor weight decrease and was stopped after 15 h
because the weight remained constant.