Packagin-related properties of protein- and chitosan-coated paper

KTH Royal Institute of Technology, Tukholma, Stockholm, Sweden
Packaging Technology and Science (Impact Factor: 1.71). 04/2005; 18(4):161 - 170. DOI: 10.1002/pts.685


The mechanical and gas-barrier properties of paper and paperboard coated with chitosan–acetic acid salt (chitosan), whey protein isolate, whey protein concentrate and wheat gluten protein were studied. Paper sheets were solution-coated using a hand applicator. In addition, bi-layer composites of wheat gluten and paper or paperboard were produced by compression moulding, and the chitosan solution was also applied on paperboard using curtain coating. Young's modulus, fracture stress, fracture strain, tearing strength, air permeance and oxygen permeability were assessed. The mechanical and air permeance measurements of solution-coated paper showed that chitosan was the most effective coating on a coat weight basis. This was due to its high viscosity, which limited the degree of penetration into the paper. The proteins, however, also enhanced the strength and toughness of the paper. Compression-moulded wheat gluten/paper or paperboard, as well as curtain-coated chitosan paperboard laminates, showed oxygen barrier properties comparable to those of paper and paperboard coated with commercial barrier materials. None of the composites could be delaminated without fibre rupture, indicating good adhesion between the coatings and the substrates. Copyright © 2005 John Wiley & Sons, Ltd.

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    • "In addition to their large availability, full biodegradability and non-ecotoxicity, protein-based materials have interesting barrier and moderate cost for food packaging applications. Gällstedt, Brottman, and Hedenqvist (2005), Han and Krochta (1999, 2001), studied the properties of whey protein coated paper. Soy protein isolate coated paper was found to impart gas and oil barrier as well as adequate mechanical properties for extending the shelf life of food products (Park et al., 2000; Rhim et al., 2006). "
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    ABSTRACT: Bionanocomposites were developed by casting/evaporation of wheat gluten (WG), cellulose nanocrystals (CNC), and TiO2 nanoparticles. The effect of addition of different percentages of CNC, and TiO2 on tensile strength (TS), Young's modulus and water sensitivity was studied. A significant improvement in the studied properties is observed when 7.5% CNC and 0.6% TiO2 is added to WG. WG/CNC 7.5%/0.6% TiO2 blend suspension was chosen to coat commercial packaging unbleached kraft paper sheets via 1, 2 and 3 coating layers. A significant enhancement of 56% and 53% in breaking length and burst index, respectively, was achieved for 3 layers coated paper. The antimicrobial activity of the coated papers, against Saccharomyces cervisiae, Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus, was investigated and expressed in terms of reduction % of surviving number (CFU) of the tested organisms. More than 98.5% reduction in CFU was observed against the organisms compared to TiO2-free coated paper. Copyright © 2015 Elsevier Ltd. All rights reserved.
    Carbohydrate Polymers 06/2015; 124. DOI:10.1016/j.carbpol.2015.01.076 · 4.07 Impact Factor
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    • "At 30% PEG concentration, HPMC coating on paper enhanced tearing resistance by 31% for 9 g/m 2 , 16% for 5 g/m 2 , and 13% for 3 g/m 2 , compared with that of the uncoated paper (433 ± 15 mN). The increases in tearing resistance arising from increases in coating weight reported in this study were consistent with the findings of Gällstedt et al. (2005) and Khwaldia (2010), who reported that increasing biopolymer coating weight increased tearing resistance and toughness of the paper. The tear index of paper, however, was not affected by HPMC coating (Sothornvit 2009). "
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    ABSTRACT: Hydroxypropyl methylcellulose (HPMC)-coated papers without plasticizer and plasticized with polyols were prepared, and the effects of coating weight, different plasticizers (glycerol (GLY), sorbitol (SOR), and polyethylene glycol (PEG)), and plasticizer contents (20% to 50%) on the physical and mechanical properties of the resulting biopolymer-coated papers were studied. Coating weight was the most important factor affecting mechanical properties. Conversely, increasing coating weight led to a decrease in gloss andto an increase in tensile strength (TS), elongation at break (%E), and tearing resistance of coated papers. The application of unplasticized HPMC coatings (3 g/m2) on paper reduced water vapor permeability (WVP) and water absorption capacity by 25% as compared with uncoated paper. All plasticizers significantly (p < 0.05) increased WVP and Cobb60 values of the films. With the exception of PEG, no effect was found with plasticizers on TS and %E ofcoated papers compared with those without plasticizer. HPMC-coated papers with PEG as a plasticizer showed significantly lower TS and higher %E and tearing resistance than the other plasticized films (p < 0.05). HPMC coating improved tensile properties and tearing resistance of paper and could be regarded as a reinforcement layer.
    Bioresources 05/2013; 8(3):3438-3452. DOI:10.15376/biores.8.3.3438-3452 · 1.43 Impact Factor
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    • "From analysis of the isoresponse contours, it can be seen that the TS of coated papers increased with increasing the coating weight. These results are in accordance with those of Gällstedt et al. (2005) who reported that the TS increased with increasing coating weight for paper sheets coated with chitosan, whey protein isolate, whey protein concentrate , and wheat gluten protein. "
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    ABSTRACT: The effects of glycerol concentration and coating weight on biopolymer-coated paper properties were investigated using response surface methodology. Tests were run on the coated papers to determine water vapor barrier and mechanical properties. Coating weight was the most important parameter affecting water vapor permeability (WVP). Conversely, increasing coating weight led to a decrease in WVP and to an increase in tensile strength (TS) of the resulting coated papers. The papers coated with sodium caseinate (NaCAS) exhibited lower WVP values than those coated with other biopolymers. The TS of the papers coated with hydroxypropylmethylcellulose (HPMC) and chitosan was not affected by the glycerol concentration. HPMC-coated papers were higher in TS and %E than the other coated papers. For all types of coated paper, a maximum level of coating weight and level of glycerol concentration within range of 18.72–26.11% were found to be optimum for minimum WVP and maximum TS and %E.Highlights► Properties of coated papers are influenced by glycerol concentration and coating weight. ► Coating weight factor decreases water vapor permeability. ► Water vapor permeability is lowest for sodium caseinate-coated paper. ► Glycerol concentration has a positive influence on elongation values. ► Optimization of responses is performed by desirability function method.
    Carbohydrate Polymers 08/2011; 86(2):1063-1072. DOI:10.1016/j.carbpol.2011.06.026 · 4.07 Impact Factor
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