Water vapour mass transfer between the crust and crumb interface is the driving force of moisture distribution from the
interior to the exterior of bread loaves (Gray & Bemiller, 2003).Residual water content and water activity of probiotic bread samples were tested 2 h after baking and over seven days storage.Expectedly, moisture and water activity of bread crust samples varied significantly (p < 0.001) during storage (Fig. 4). Water activity of bread crust samples increased from 0.85 to 0.95 over 7 days of storage and there was a minor change of bread crumb water