The concentration of b-glucan affected the two rheological parameters significantly. Its increase raised the viscosity and the shear stress (Fig. 1). Its low density (260 g/L) in relation to inulin (580 g/L) requires the addition of a larger volume for obtaining the same
formulation proportion (w/w). A greater amount of b-glucan means more solid particles and a greater contact surface. It is important to point out that molding and removing air bubbles from formulation BG10 were difficult due to its high concentration of b-glucan (10 g/100 g). The solid particle content was over the standards proposed by Chevalley (1974), indicating that the amount of cocoa butter used was not sufficient to cover the solid particles and made Lee et al. (2009) also reported an increase in plastic viscosity and shear stress of chocolate formulations starting at 10% substitution of b-glucan concentrate with cocoa butter.