The formed alginate-whey protein aggregates do not provide sufficient protection against the harsh gastric juice conditions as they are not able to encapsulate the bacterial cells explaining the significantly lower (p < 0.01) viabilities of L. rhamnosus GG in the case of WPC based films. Our results indicate one medium size (30e 40 g) slice of bread can deliver approx. 7.57e8.98 and 6.55e 6.91 log cfu/portion before and after the in-vitro digestion respectively, meeting the required minimum amount of viable probiotic bacteria delivered to the human host (Saad et al., 2013).