2.9. Moisture content and water activity
The moisture content (X) of the fresh and treated apples was
determined gravimetrically, using the equation below, by drying at
105 1 C until constant weight was achieved. Here, md is the
weight of the apple slice after the drying processes and m is the
weight of the apple slice. The water activity (aW) of fresh,impregnated and dried samples was measured at 25 C using a
Novasina aW Sprint TH-500 instrument (Pfäffikon, Switzerland).