Sodium caseinate (CasNa) is a natural water-soluble polymer originating from the acid precipitation and neutralization of casein from milk and cheese production. Coating is a process in which non-porous paper can be obtained by covering the porous structure and surface of cellulose fiber, improving its gas and water vapor barrier properties. CasNa/GY-coated papers may be a good alternative for packaging materials in the food, medical, and electronic sectors, which would promote sustainability.Įxtensive research has been conducted on coated paper prepared using bio-based and renewable materials, such as zein, proteins, starch, nanocellulose, and polyvinyl alcohol, instead of plastics. Overall, CasNa/GY was superior to the CasNa/SO coating. Compared to SO, GY better coated and penetrated the CasNa matrix, which positively affected the chemical and morphological structure of the coating layer and the interaction between the coating layer and paper. The air barrier and flexibility of the CasNa/GY-coated papers were higher than those of the CasNa/SO-coated papers. The use of GY and SO strongly affected the tensile strength, elongation at break, and air barrier of the CasNa/GY- and CasNa/SO-coated paper. The morphological and chemical structure, burst strength, tensile strength, elongation at break, air permeability, surface properties, and thermal stability of the pristine CasNa-, CasNa/GY-, and CasNa/SO-coated papers were evaluated. In this study, entirely bio-based sodium caseinate (CasNa)-coated papers with two plasticizers, glycerol (GY) and sorbitol (SO), were prepared. Paper-based packaging materials are candidates for improving food sustainability however, paper has poor gas and water vapor barrier properties. Bio-based packaging materials are promising alternatives to petroleum-based plastics.
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