Improvement of mechanical and heat-sealing properties of edible chitosan films via addition of gelatin and CO 2 treatment of film-forming solutions
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Author list: Prateepchanachai S., Thakhiew W., Devahastin S., Soponronnarit S.
Publisher: Elsevier
Publication year: 2019
Journal: International Journal of Biological Macromolecules (0141-8130)
Volume number: 131
Start page: 589
End page: 600
Number of pages: 12
ISSN: 0141-8130
Languages: English-Great Britain (EN-GB)
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Abstract
Glycerol, gelatin and CO 2 were used to prepare chitosan-based packaging films with improved mechanical properties and seal strength. Nuclear magnetic resonance spectroscopy, X-ray diffraction analysis, Fourier transform infrared spectroscopy and dynamic mechanical analysis were conducted; the results were used to explain the mechanical and sealing properties data. Film color was also measured. Combined addition of glycerol and use of CO 2 to treat the film-forming solution led to decreased film crystallinity and glass transition temperature, resulting in improved film mechanical properties. Addition of glycerol and gelatin resulted in enhanced molecular interactions between chitosan-gelatin and improved sealability of the films. Films with the best mechanical and sealing properties were obtained from a solution with 25% (w/w) glycerol and treated with CO 2 and from that with 25% (w/w) glycerol and 10% (w/v) gelatin, respectively. Films with addition of both glycerol and gelatin exhibited lower lightness, but higher yellowness than the commercial stretch film. ฉ 2019 Elsevier B.V.
Keywords
gelatin, Heat seal strength
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