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Development of starch-cellulose composite films with antimicrobial potential
Liping Wang1, Yukun Li1, Lei Ye2
1State Key Laboratory of Food Science and Resources, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China; School of Food Science and Technology, Jiangnan University, 1800 Lihu Road, Wuxi 214122, China.
International Journal of Biological Macromolecules
|July 14, 2024
Summary
This study developed sustainable starch-based antibacterial films using black tea cellulose nanocrystals (BT-CNCs). The optimal 5% BT-CNCs addition enhanced film properties and antibacterial activity, showcasing potential for advanced food packaging.
Area of Science:
- Materials Science
- Food Science
- Biotechnology
Background:
- Starch-based films offer biodegradable alternatives for food packaging.
- Enhancing mechanical, barrier, and antibacterial properties of bioplastics is crucial for practical applications.
- Valorization of natural waste, like tea byproducts, aligns with sustainable development goals.
Purpose of the Study:
- To investigate the structure-property relationships of starch films reinforced with black tea cellulose nanocrystals (BT-CNCs).
- To evaluate the impact of incorporating antibacterial agents (chitosan, ε-polylysine, zinc oxide nanoparticles) alongside BT-CNCs on film performance.
- To assess the potential of these composite films as sustainable food packaging materials.
Main Methods:
- Preparation of starch-based films with varying concentrations of BT-CNCs and antibacterial agents.
- Characterization of film structure, including surface morphology and crystallinity.
- Evaluation of physical properties: light transmittance, UV shielding, water and oxygen barrier properties, solubility, and tensile strength.
- Assessment of antibacterial efficacy against E. coli and S. aureus.
Main Results:
- The optimal BT-CNCs content was determined to be 5% (w/w Starch).
- Films exhibited smooth surfaces, maintained high light transmittance (>80%), and the zinc oxide nanoparticle variant provided effective UV shielding.
- Combined BT-CNCs and antibacterial agents improved water and oxygen barrier properties. The St/CNCs/CS film showed lowest solubility and highest tensile strength.
- Antibacterial activity varied, with St/CNCs/ZnONP showing the highest efficacy, particularly against E. coli.
Conclusions:
- Black tea cellulose nanocrystals effectively reinforce starch-based films, improving their structural and functional properties.
- The incorporation of antibacterial agents like chitosan, ε-polylysine, and zinc oxide nanoparticles imparts significant antimicrobial activity.
- These composite films represent a promising advancement in sustainable food packaging, utilizing natural waste for enhanced material performance.
