Olive oil based edible W/O/W emulsions stability as affected by addition of some acylglycerides

Abstract

Olive oil based W/O/W double emulsions (DEs) were prepared with polyglycerol polyricinoleate (PGPR, 3 or 6%) and sodium caseinate as emulsifiers both singly in a control sample, and with the addition of two fat-crystallizers (Verols V10 or V50) at two concentrations (3 or 6%). Globule size distribution was essentially monomodal with area-volume mean diameter (d) values ∼2 μm. Creaming along an 8 d refrigerated storage was always minor. The predominant elastic behavior in control samples evolved to viscous in samples with Verols. DSC revealed that V10 and V50 crystalized as α- and β′-polymorphs respectively, that can absorb at a W/O interface, potentially producing interfacial crystallization (V10 < V50). Instead, (V10 > V50) concerning DEs stabilization because V50 plus 3 or 6% PGPR produced essentially glassy matrices, thus impeding Pickering effects. V10 plus 3 or 6% PGPR formed crystalline DEs with presence of lyotropic mesophases, which yielded W/O Pickering stabilization effects.