Abstract
The development of edible films based on the natural biopolymer feather keratin (FK) from poultry feathers is of great interest to food packaging. Edible dialdehyde carboxymethyl cellulose (DCMC) crosslinked FK films plasticized with glycerol were prepared by a casting method. The effect of DCMC crosslinking on the microstructure, light transmission, aggregate structure, tensile properties, water resistance and water vapor barrier were investigated. The results indicated the formation of both covalent and hydrogen bonding between FK and DCMC to form amorphous FK/DCMC films with good UV-barrier properties and transmittance. However, with increasing DCMC content, a decrease in tensile strength of the FK films indicated that plasticization, induced by hydrophilic properties of the DCMC, partly offset the crosslinking effect. Reduction in the moisture content, solubility and water vapor permeability indicated that DCMC crosslinking slightly reduced the moisture sensitivity of the FK films. Thus, DCMC crosslinking increased the potential viability of the FK films for food packaging applications, offering a value-added product.
Highlights
Microplastics are plastic fragments, synthetic fibers, and plastic particles of less than 5 mm in diameter, that have been detected in seawater, fresh water, food, air, and even human feces [1,2,3,4].Microplastics with a large specific surface area that can carry other contaminants, that have potential negative effects on the ecological environment and human health [5], and there is an urgent need to curb the rising trend of global microplastic pollution
According to Mu’s method [20], dialdehyde carboxymethyl cellulose (DCMC) was prepared in the solution by controlled oxidation
The glycerol-plasticized feather keratin (FK) films crosslinked by a novel crosslinking reagent DCMC were successfully prepared by the casting process
Summary
Microplastics are plastic fragments, synthetic fibers, and plastic particles of less than 5 mm in diameter, that have been detected in seawater, fresh water, food, air, and even human feces [1,2,3,4].Microplastics with a large specific surface area that can carry other contaminants, that have potential negative effects on the ecological environment and human health [5], and there is an urgent need to curb the rising trend of global microplastic pollution. Microplastics are plastic fragments, synthetic fibers, and plastic particles of less than 5 mm in diameter, that have been detected in seawater, fresh water, food, air, and even human feces [1,2,3,4]. Various studies have been conducted on the use of protein-based plastics in food packaging due to the abundance, biodegradability and low toxicity of proteins, including gelatin [6], soy protein isolate (SPI) [7], whey protein [8], and wheat gluten [9] derived from agricultural sources. One of the best protein sources is feather keratin (FK), which comes from inedible renewable sources and is available in large quantities from the poultry industry. It is estimated that ~5 billion pounds of feathers are generated
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