Fig. 4. Changes in water activity (a,b) and residual water content (c,d) of pan bread crust coated with sodium alginate (ALG) or sodium alginateewhey protein concentrate (ALG/WPC) edible films and air dried either at 60 C for 10 min or 180 C for 2 min, and crumb samples during 7 days (168 h) of storage at room temperature.