期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 131, 期 -, 页码 589-600出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2019.03.067
关键词
Gelatin; Heat seal strength; Mechanical properties
资金
- Thailand Research Fund (TRF) [RTA 6180008, DPG 5980004]
Glycerol, gelatin and CO2 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 CO2 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 CO2 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. (C) 2019 Elsevier B.V. All rights reserved.
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