Effects of treatment of dielectric barrier discharge cold plasma (DBD‐CP) on mechanical, barrier and functional characteristics of casein‐based films

Abstract

Dielectric barrier discharge cold plasma (DBD-CP) improves packing characters of films. According to our previous study, the physical performances including barrier and mechanical properties of casein films were enhanced by DBD-CP treatment. The aim of this paper was to study the effects of DBD-CP discharge on the physical performances of films made from casein-based film-forming solutions. The structural characteristics, mechanical and barrier properties, and heat stability of the produced casein films were evaluated. As expected, the differential scanning calorimeter (DSC) results indicated that the DBD-CP treatment improved heat stability of the films. However, other properties such as tensile strength (TS), elongation at break (EAB) and barrier to water vapours were negatively affected. Similar results were obtained after examining casein film-forming solution treated with DBD-CP using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). In conclusion, treating the film-forming solution directly with DBD-CP should be done cautiously while reinforcing the films packing properties.

Effects of argon dielectric barrier discharge (DBD) cold plasma treatment on mechanical, barrier and antimicrobial properties of chitosan film

“…The etching effect, therefore, is advantageous for the development of active packaging film (Bahrami et al ., 2022; Hoque et al ., 2022). Generally, the longer treatment time causes more chemical interactions between plasma and film surface, producing more etching effect, which roughens the surface of treated films (Romani et al ., 2019; Sheikhi et al ., 2021a; Bahrami et al ., 2022; Hou et al ., 2022). Until 60 s treatment, we observed no significant changes in the thickness of the films indicating that plasma requires a longer treatment time to cause an etching effect on the film surface.…”

Cold atmospheric plasma‐induced protein modification: Novel nonthermal processing technology to improve protein quality, functionality, and allergenicity reduction

“…This further justifies that the modification via HV-CAP is not highly specific, and proteins tend to behave sporadically when exposed to HV-CAP. Nevertheless, the produced films had high heat stability compared to their untreated counterparts (Hou et al, 2022). Similarly, Wu et al (2020) documented improved barrier and mechanical properties for casein films subjected to HV-CAP treatment directly at different voltages (30-70 V) for 60 s, which was attributed to crystalloid migration and casein aggregation caused by the reactive species produced.…”

“…The application of HV-CAP in improving the filmforming properties of animal proteins has been reported. For example, in the recent work by Hou et al (2022), casein-based film-forming solutions were treated with HV-CAP at different voltages (30-70 V) for 60 s, and the mechanical properties, heat stability, and barrier properties of the produced casein films were investigated. The authors reported that HV-CAP had varying impacts on the mechanical and water vapor barrier properties; hence, optimizing the HV-CAP condition was imperative.…”

“…However, mechanical properties and barriers to water vapors were negatively affected. (Hou et al, 2022), Casein DBD-plasma system at different voltages 0-70 V under the duration of 60 s, and different times 0-120 s under the voltage of 50 V.…”

“…This further justifies that the modification via HV‐CAP is not highly specific, and proteins tend to behave sporadically when exposed to HV‐CAP. Nevertheless, the produced films had high heat stability compared to their untreated counterparts (Hou et al., 2022). Similarly, Wu et al.…”