Journal
CARBOHYDRATE POLYMERS
Volume 87, Issue 1, Pages 227-234Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2011.07.040
Keywords
Pullulan; Alginate; Water activity; FTIR; Glass transition temperature
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Funding
- National High Technology Research and Development Program of China (863) [2007AA10Z362]
- Canada Foundation for Innovation
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Pullulan-sodium alginate blend films were prepared and characterized as a function of water activity (a(w)). At low a(w), the incorporation of alginate into pullulan film increased the tensile strength and elastic modulus, but decreased the elongation at break of the composite films; the opposite trends were observed at elevated a(w). Above 0.43 a(w) water exerted a typical plasticization effect upon the biopolymer blends. As a(w) increased from 0.23 to 0.43, an anti-plasticization effect was observed as tensile strength and elastic modulus increased. The glass transition temperature of all samples decreased substantially as aw increased from 0.23 to 0.84 due to the plasticization effect of water. Within this a(w) range, one transition temperature was observed for all film specimens. The stretching vibration band of O-H was investigated using attenuated total reflection Fourier transform infrared spectroscopy to identify the various species of water interacting with the polysaccharide films. (C) 2011 Elsevier Ltd. All rights reserved.
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