4.7 Article

Formation and creaming stability of alginate/micro-gel particle-induced gel-like emulsions stabilized by soy protein isolate

Journal

FOOD HYDROCOLLOIDS
Volume 121, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2021.107040

Keywords

Digestion; External gelation; Gel-like emulsion; Micro-gel particle; Storage stability

Funding

  1. China Scholarship Council [201708350111]
  2. Teagasc-The Irish Agriculture and Food Development Authority [RMIS6821, MDDT1392]

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This study investigated a novel method to enhance creaming stability of soy protein isolate (SPI)-stabilized emulsions by introducing alginate and alginate-based micro-gel particles to form gel-like emulsions. The presence of micro-gel particles in emulsions increased viscosity, creaming stability, and storage modulus, contributing to improved stability and expanding application of plant protein-stabilized emulsions in the food industry.
Many strategies have been developed to improve stability of plant protein-stabilized emulsions, such as modifying properties of plant proteins, using plant protein-polysaccharide complexes, and forming gel-like emulsions. In this study, a novel method was investigated to enhance creaming stability of soy protein isolate (SPI)-stabilized emulsions by introducing alginate and alginate-based micro-gel particles to form gel-like emulsions. Gellike emulsions could be obtained at high levels of micro-gel particles (>6.0%) in the presence of alginate (>0.1%), while the concentration of SPI-coated droplets (0-10%) played a relatively unimportant role, probably because the gelation mechanism was interactions between alginate molecules and Ca2+-induced micro-gel particles. Viscosity and creaming stability of emulsions and storage modulus (G ') of gel-like emulsions increased with increasing contents of micro-gel particles in emulsions. Emulsions without micro-gel particles showed extensive creaming during storage, and emulsions containing micro-gel particles were visually stable after storage for six weeks, although all samples showed good stability to coalescence. In addition, the presence of micro-gel particles in emulsions slightly decreased the bioaccessibility of encapsulated lycopene after in-vitro digestion. The method presented in this study was important for improving creaming stability of plant proteinstabilized emulsions and expanding application of plant protein-stabilized emulsions in food industry.

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