Abstract

CARRERA, Y. et al. Stabilizing oil-in-water emulsions with yam bean (Pachyrhizus erosus L. urban) solids. Rev. Mex. Ing. Quím [online]. 2014, vol.13, n.2, pp.447-456. ISSN 1665-2738.

Yam bean (Pachyrhizus erosus L. Urban) solids (YS) were used at concentrations of 3, 5 and 7 % w/w for stabilizing oil-in-water emulsions with a 0.15 mass fraction (E₃, E₅ and E₇). Higher YS concentrations produced emulsions with smaller average particle size distribution, more marked shear thinning behaviour, and higher solid-like (tan δ < 1) viscoelastic properties. Optical micrographs revealed that the rheological properties, particle size distribution, and stability of the emulsions were predominantly associated to the formation of 3-D particles network in the continuous phase that immobilized the emulsion droplets. The micrographs also showed small sized YS fragments adsorbed at the oil-water interface, contributing with a steric stabilization term to emulsions stability. Variations in the rheological properties of the emulsions with aging time (14 days) were less pronounced when using higher YS concentrations.

Keywords : yam bean solids; solids network formation; oil-in-water emulsions; stability; rheology.