Water vapor sorption and desorption isotherm plot at 25 °C of the unsonicated and sonicated micellar casein concentrate samples. a: control, b: S-2000, c: S-3000, d: S-4000. Red line represents the moisture sorption process, blue line represents the moisture desorption process. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)