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Development of Novel Zein-Sodium Caseinate Nanoparticle (ZP)-Stabilized Emulsion Films for Improved Water Barrier Properties via Emulsion/Solvent Evaporation

Wang, Li-Juan, Yin, Ye-Chong, Yin, Shou-Wei, Yang, Xiao-Quan, Shi, Wei-Jian, Tang, Chuan-He, Wang, Jin-Mei
Journal of agricultural and food chemistry 2013 v.61 no.46 pp. 11089-11097
caseinates, creaming, droplets, emulsifying, emulsions, ethyl acetate, evaporation, hydrophobicity, microstructure, nanoparticles, optical properties, permeability, physical activity, water vapor, zein
This work attempted to develop novel high barrier zein/SC nanoparticle (ZP)-stabilized emulsion films through microfluidic emulsification (ZPE films) or in combination with solvent (ethyl acetate) evaporation techniques (ZPE-EA films). Some physical properties, including tensile and optical properties, water vapor permeability (WVP), and surface hydrophobicity, as well as the microstructure of ZP-stabilized emulsion films were evaluated and compared with SC emulsion (SCE) films. The emulsion/solvent evaporation approach reduced lipid droplets of ZP-stabilized emulsions, and lipid droplets of ZP-stabilized emulsions were similar to or slightly lower than that of SC emulsions. However, ZP- and SC-stabilized emulsion films exhibited a completely different microstructure, nanoscalar lipid droplets were homogeneously distributed in the ZPE film matrix and interpenetrating protein–oil complex networks occurred within ZPE-EA films, whereas SCE films presented a heterogeneous microstructure. The different stabilization mechanisms against creaming or coalescence during film formation accounted for the preceding discrepancy of the microstructures between ZP-and SC-stabilized emulsion films. Interestingly, ZP-stabilized emulsion films exhibited a better water barrier efficiency, and the WVP values were only 40–50% of SCE films. A schematic representation for the formation of ZP-stabilized emulsion films was proposed to relate the physical performance of the films with their microstructure and to elucidate the possible forming mechanism of the films.