title: Stability and Oil Migration of Oil-in-Water Emulsions Emulsified by Phase-Separating Biopolymer Mixtures.
abstract: Oil-in-water (O/W) emulsions with varying concentration of oil phase, medium-chain triglyceride (MCT), were prepared using phase-separating gum arabic (GA)/sugar beet pectin (SBP) mixture as an emulsifier. Stability of the emulsions including emulsion phase separation, droplet size change, and oil migration were investigated by means of visual observation, droplet size analysis, oil partition analysis, backscattering of light, and interfacial tension measurement. It was found that in the emulsions prepared with 4.0% GA/1.0% SBP, when the concentration of MCT was greater than 2.0%, emulsion phase separation was not observed and the emulsions were stable with droplet size unchanged during storage. This result proves the emulsification ability of phase-separating biopolymer mixtures and their potential usage as emulsifiers to prepare O/W emulsion. However, when the concentration of MCT was equal or less than 2.0%, emulsion phase separation occurred after preparation resulting in an upper SBP-rich phase and a lower GA-rich phase. The droplet size increased in the upper phase whereas decreased slightly in the lower phase with time, compared to the freshly prepared emulsions. During storage, the oil droplets exhibited a complex migration process: first moving to the SBP-rich phase, then to the GA-rich phase and finally gathering at the interface between the two phases. The mechanisms of the emulsion stability and oil migration in the phase-separated emulsions were discussed.
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre, Department of Food and Pharmaceutical Engineering, Hubei Univ. of Technology, Wuhan, 430068, China.|Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei Univ. of Technology, Wuhan, 430068, China.
authors.forename: Nan
authors.initials: N
authors.lastname: Yang
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre, Department of Food and Pharmaceutical Engineering, Hubei Univ. of Technology, Wuhan, 430068, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Mao
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre, Department of Food and Pharmaceutical Engineering, Hubei Univ. of Technology, Wuhan, 430068, China.
authors.forename: Ruihe
authors.initials: R
authors.lastname: Lv
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre, Department of Food and Pharmaceutical Engineering, Hubei Univ. of Technology, Wuhan, 430068, China.|Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei Univ. of Technology, Wuhan, 430068, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre, Department of Food and Pharmaceutical Engineering, Hubei Univ. of Technology, Wuhan, 430068, China.|Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei Univ. of Technology, Wuhan, 430068, China.
authors.forename: Yapeng
authors.initials: Y
authors.lastname: Fang
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre, Department of Food and Pharmaceutical Engineering, Hubei Univ. of Technology, Wuhan, 430068, China.|Hubei Collaborative Innovation Centre for Industrial Fermentation, Hubei Univ. of Technology, Wuhan, 430068, China.
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Nishinari
authors.affiliation: Glyn O. Phillips Hydrocolloid Research Centre, Department of Food and Pharmaceutical Engineering, Hubei Univ. of Technology, Wuhan, 430068, China.
authors.forename: Glyn O
authors.initials: GO
authors.lastname: Phillips
mesh_terms: D000045:Acacia / Q000737:chemistry*; D027461:Beta vulgaris / Q000737:chemistry*; D045703:Emulsifying Agents / Q000737:chemistry*; D004655:Emulsions / Q000737:chemistry*; D006170:Gum Arabic / Q000737:chemistry*; D009821:Oils / Q000737:chemistry*; D010368:Pectins / Q000737:chemistry*; D013500:Surface Tension; D014280:Triglycerides; D014867:Water / Q000737:chemistry
chemical_list: D045703:Emulsifying Agents; D004655:Emulsions; D009821:Oils; D014280:Triglycerides; D014867:Water; D010368:Pectins; D006170:Gum Arabic
keywords: biopolymer mixture emulsifier; emulsion stability; oil migration; phase separation