Hydroxypropylmethylcellulose–β-lactoglobulin mixtures at the oil–water interface. Bulk, interfacial and emulsification behavior as affected by pH

摘要: Abstract In this work we have studied the bulk, interfacial and emulsification behavior of a surface-active polysaccharide, hydroxypropylmethylcelulose (HPMC) β-lactoglobulin (βlg) mixtures at two pHs, 3 6. The absence an increase particle size or modification zeta potential in HPMC/βlg indicated that both biopolymers would not form complexes bulk pH protein presented positive charge 3, which makes possible formation weak complex with HPMC. interface was dominated by protein, indicating displacement less HPMC pressure mixture failed between curves corresponding to single components. βlg Complexation may decrease its availability adsorb O/W interface, lowering pressure. A bimodal distribution obtained emulsions 6 their confocal images evidenced strong flocculation, non-adsorbed remain continuous phase, thus promoting depletion flocculation oil droplets. At emulsion droplet curve bimodal, polidispersity. Nevertheless, high stability coalescence observed. mixed is reduced comparison alone, complexation When analyzing microcopy recently prepared emulsions, no