Keratin based bioplastic film from chicken feathers and its characterization

Rational design and characterization of bioplastics from Hermetia illucens prepupae proteins

“…The same result is enhanced comparing crayfish‐based and keratin‐based bioplastic with BSF‐protein bioplastic, in fact all the specimens investigated in this part of the present study show higher tensile strength at break . An overall stronger increase of strain at break can be evaluated if protein from BSF are employed with respect to albumen‐based and crayfish‐based bioplastic as shown in Figure . These results are also consistent with the higher glass transition temperature reported for albumen and crayfish based materials with respect to the materials studied in the present article, leading to a less ductile behavior at room temperature.…”

“…Mechanical properties such as tensile stress and strain at yield and at break, are directly influenced by chain linking density and network structure of the resulting polymer . In Figures and a detailed comparison has been shown with other films obtained from animal proteins, such as albumen, crayfish and keratin . This comparison has been made taking in consideration animal proteins mixed with 10‐60 wt% glycerol only, in strong similarity with the present study.…”

“…As compared to albumen‐based bioplastic, BSF protein‐based bioplastic, has relative higher tensile strength at break, not only in the average value considered, but also taking in account the SD on the measurement, in particular if 0.5 g of protein is employed . The same result is enhanced comparing crayfish‐based and keratin‐based bioplastic with BSF‐protein bioplastic, in fact all the specimens investigated in this part of the present study show higher tensile strength at break . An overall stronger increase of strain at break can be evaluated if protein from BSF are employed with respect to albumen‐based and crayfish‐based bioplastic as shown in Figure .…”

Films from an Aqueous Suspension of Alkaline Pretreated and Fine Milled Chicken Feathers

“…Figure 6 shows the tensile properties for the films with a single plasticizer. These films were stronger and more brittle than those prepared previously from thermoplastic feathers and keratin (tensile strength 5.2 -5.9 MPa [18], and strength 0.3 MPa and Young's modulus 25 MPa [9]). The mechanical properties, except of strain at break, were similar to the carboxymethylated keratin films by Schrooyen et al [38], but weaker than the grafted feather films without and with 30% glycerol (206.3 and 55.7 MPa, respectively) [19].…”

“…The amino acids are tightly-packed and crosslinked making extraction of keratin challenging [5] [8]. However, keratin can be extracted by chemical and enzymatic means, superheated water, and with ionic liquids [9] [10]. This adds to the complexity of the feather processing.…”