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Ammonia-sensitive cellulose acetate-based films incorporated with Co-BIT microcrystals for smart packaging
Zongshu Xu1, Ze Cheng1, Qun Tang1
1Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.
New smart packaging materials were developed using cellulose acetate loaded with cobalt-based metal-organic frameworks (Co-BIT). These materials enhance food freshness monitoring with improved strength, barrier properties, and antibacterial functions.
Area of Science:
- Materials Science
- Food Science
- Chemistry
Background:
- Growing demand for smart packaging to monitor food freshness.
- Need for active packaging with enhanced functional properties.
Purpose of the Study:
- To develop novel smart active packaging materials by incorporating Co-based MOF (Co-BIT) into a cellulose acetate (CA) matrix.
- To investigate the impact of Co-BIT loading on the structural, physical, and functional characteristics of CA films.
Main Methods:
- Synthesis of Co-based MOF (Co-BIT) microcrystals.
- Loading Co-BIT into a cellulose acetate (CA) matrix to form composite films.
- Characterization of the structural, mechanical, barrier, UV-protective, antibacterial, and ammonia-sensing properties of the CA/Co-BIT films.
Main Results:
- Uniform integration of Co-BIT within the CA matrix.
- Significant improvements in mechanical strength (24.12 to 39.76 MPa), water barrier properties, and UV protection.
- High antibacterial efficacy (>95.0%) against Escherichia coli and Staphylococcus aureus.
- Demonstrated ammonia-sensitivity and color stability.
- Successful application in indicating shrimp spoilage via color change.
Conclusions:
- Co-BIT loaded CA composite films exhibit enhanced properties making them suitable for smart active packaging.
- These materials offer a promising solution for real-time food freshness monitoring and spoilage indication.
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