Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 108, Issue -, Pages 576-584Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2017.12.049
Keywords
Intelligent film; PVA; pH sensitivity; Mulberry extract; Fish freshness
Funding
- National Natural Science Foundation of China [31770618]
- Fundamental Research Funds of the Central Universities [2572016AB18]
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The aim of this study was to prepare a visually responsive intelligent film based on poly (vinyl alcohol) (PVA), chitosan nanoparticles (CHNPs) and mulberry extracts (MBE). CHNPs were first prepared by using ionotropic gelation method to enhance the mechanical properties of PVA based films. The morphology, particle size, zeta potential and crystallinity of CHNPs were measured. The resultant CHNPs were spherical with a diameter of 381.2 nm, with high stability and a zeta potential of 49.1 +/- 1.33 mV. The film with 6% CHNPs (P-C6) had the highest tensile strength (similar to 73.43 MPa). MBE was incorporated into the P-C6 film. The film containing 20% MBE had the highest tensile strength and showed visible color responses to variations across pH 1-13. The film was tested by monitoring the spoilage of fish. The color of the film changed from red to green as the fish spoiled. Therefore, the pH responsive intelligent film developed here can be used as a package label to detect food spoilage. (C) 2017 Elsevier B.V. All rights reserved.
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