Fig. 2. Electron micrographs at 100x magnification of cookies made with whey protein concentrate. Images: 2A (control treatment with no whey protein concentrate and 28.9 g
margarine/100 g), 2B (treatment with 25.9 g whey protein concentrate/100 g and 28.9 g margarine/100 g), 2CeE (treatment with 40 g whey protein concentrate/100 g and 33.4 g
margarine/100 g). AB: air bubble, PM: protein matrix, FM: fibrous matrix, SLC: starch lipid complex