Erdem, Burcu GokkayaDiblan, SevginKaya, Sevim2025-01-062025-01-0620190960-30851744-357110.1016/j.fbp.2019.09.0152-s2.0-85073171008https://doi.org/10.1016/j.fbp.2019.09.015https://hdl.handle.net/20.500.14669/1942The overall aim of this research was to investigate effect of sunflower oil addition on formation of whey protein based biocomposite edible films. The biocomposite films were prepared through an emulsion technique by dispersing three different ratios of sunflower oil (0.05%, 0.10% and 0.15%) in whey protein isolate medium. Moisture content, solubility in water, water sorption kinetic, swelling index, contact angle, color, whiteness, and opacity index of the films were examined. Thermal, barrier, and mechanical properties were tested. Particle size distribution and surface microstructure of the films were also analyzed. The moisture content of the biocomposite films was not affected with sunflower oil addition but the solubility showed reducing tendency. Increasing oil content increased contact angle. Although color parameters, whiteness index, and total color were not affected significantly by oil addition whereas the opacity index of the biocomposite films was determined to be higher than the control film (no sunflower oil present). Glass transition value of the control film was significantly lower than those of emulsified films (p <0.05). All of the film forming emulsions showed bimodal particle size distribution with two major peaks. The results showed that despite the low oil amount in biocomposite film composition, oil addition had a positive effect on the water vapor and oxygen barrier properties of the films. It was understood that low amount of sunflower oil increased the hydrophobic property of the films without any adverse change in the barrier and optical characters of the films. (C) 2019 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.eninfo:eu-repo/semantics/closedAccessBiocomposite filmWhey protein isolateSunflower oilHydrophobicityBarrier propertiesOptical PropertiesArticle280Q1270118WOS:000500051200024Q1