Lipid Particle Size Effect on Water Vapor Permeability and Mechanical Properties of Whey Protein/Beeswax Emulsion Films

Abstract

Lipid particle size effects on water vapor permeability (WVP) and mechanical properties of whey protein isolate (WPI)/beeswax (BW) emulsion films were investigated. Emulsion films containing 20 and 60% BW (dry basis) and mean lipid particle sizes ranging from 0.5 to 2.0 microm were prepared. BW particle size effects on WVP and mechanical properties were observed only in films containing 60% BW. WVP of these films decreased as lipid particle size decreased. As drying temperature increased, film WVPs decreased significantly. Meanwhile, tensile strength and elongation increased as BW particle size decreased. However, for 20% BW emulsion films, properties were not affected by lipid particle size. Results suggest that increased protein-lipid interactions at the BW particle interfaces, as particle size decreased and resulting interfacial area increased, result in stronger films with lower WVPs. Observing this effect depends on a large lipid content within the protein matrix. At low lipid content, the effect of interactions at the protein-lipid interfaces is not observed, due to the presence of large protein-matrix regions of the film without lipid, which are not influenced by protein-lipid interactions.

Effect of the addition of soy lecithin and Yucca schidigera extract on the properties of gelatin and glycerol based biodegradable films.

“…Among the macromolecules used in film production, proteins are widely used due to their functional properties and the variety of available sources and low production cost, including caseinates, whey protein, wheat gluten and gelatin [2][3][4][5] . Films based on gelatin have good tensile strength and good gas barrier properties, however, due to its hydrophilic nature, they are not efficient as barrier to water vapor.…”

Evaluation of Physico-Mechanical and Antimicrobial Properties of Gelatin- Carboxymethyl Cellulose Film Containing Essential Oil of Bane (Pistacia atlantica)

“…Moreover, all essential oils except citronella reduced tensile strength and essential oil of thyme reduced stretch percent up to its breaking point. The films containing essential oil of tarragon was not significantly different compared to others, but other essential oils increased the stretch percent (18). Evaluation of the solubility showed that highest and lowest solubility was obtained in control (30.39%) and the treatment containing 0.8 % essential oil (13.6%), respectively.…”

Influence of Liquid Paraffin, White Soft Paraffin and Initial Hydration on Viscosity of Corticosteroid Cream

“…Yongcheng and Park assumed that the average size of the particles in microemulsions usually depends on the type of emulsifier and is predictable [10]. The diameter of particles in emulsion of lipid in the film affects the water permeability of the film and its mechanical properties [11]. Stokes equation includes sedimentation rate (U), diameter of the dispersed phase (d), the density of the dispersing phase (ρP), the density of the dispersed phase (ρL), gravity (g), dynamic viscosity of the dispersion medium (μ) and represents the relationships between the diameter of dispersed particles and the viscosity of the system using Eq 1 [12].…”