Modification and improvement of biodegradable packaging films by cold plasma; a critical review

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

“…DBD–CP could weaken the crystalline structure during the plasma discharge process by particle bombardment and etching (Clément et al ., 2010). However, the increase in diffraction peaks could be due to the crystalloids aggregating or migrating to the protein surface when water is removed from casein during DBD‐CP discharge (Bahrami et al ., 2020). Nevertheless, this is a speculation hypothesis that needs further investigation.…”

“…There have been numerous reports that CP can improve packing properties such as TS, EAB, barrier property and heat stability of films made from zein, starch, soybean meal, whey protein and gelatin, among others (Bahrami et al ., 2020). Moreover, our previous study concluded that DBD‐CP treatment improves the mechanical properties and barrier performances of casein films (Wu et al ., 2020a).…”

“…Surface roughness, concentration of polar groups and hydrophilicity of gelatin-based films can be changed by CP; nevertheless, barrier properties including water vapour and oxygen permeability of the films are not significantly affected by CP treatment (Pankaj et al, 2015). Films made from proteins, polysaccharides and other CP-modified bio-based materials enhanced various packing properties, particularly mechanical properties (Bahrami et al, 2020). explained these modifications by suggesting that etching action is induced, causing the arrangement order of proteins to change during the DBD-CP discharge.…”

Evaluation of Physical, Mechanical and Antibacterial Properties of Pinto Bean Starch-Polyvinyl Alcohol Biodegradable Films Reinforced with Cinnamon Essential Oil

“…Starch, cellulose, pectin, chitosan, and gums, in addition to their derivatives, are the main carbohydrate-based composites used in the food packaging field so far [ 8 ]. Among the abovementioned biopolymers, starches are considered as suitable film-forming biocomposites owing to their high extraction efficiency, availability, biodegradability, biocompatibility, and economical concerns [ 9 ]. Starch-based composite films are semi-permeable barriers against various gases (e.g., oxygen and carbon dioxide), moisture, flavors, and lipid components, and have no toxicity, odor, color, taste, etc.…”

“…Starch is not considered as a real thermoplastic biopolymer, while the addition of water and/or combination with other polymers can construct a thermoplastic network [ 10 ]. It has been reported that water addition can induce the mobility of starch chains, then the following heat process at high temperatures (>90 °C) can also disrupt the three-dimensional structure and semi-crystallinity of starch granules [ 9 ]. Pinto beans are classified as pulses and considered as one of the potential budget-friendly sources of starch (containing 17–20%).…”