THERMOPLASTIC STARCH FILMS DOPED WITH CELLULOSE NANOCRYSTALS AND ARONIA EXTRACT FOR FOOD SPOILAGE DETECTION

Date

2024-11-29

Author

Kılıç, Nisa Nur

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In this study, aronia extract (AE), cellulose nanocrystal (CNC), and thermoplastic starch (TPS) containing films (AE/CNC/TPS) were developed and characterized to improve the thermal, mechanical, and active properties of TPS films. The optical, mechanical, morphological, thermal, active, and colorimetric intelligence properties of the films were investigated comprehensively. The findings revealed that AE exhibited pH-sensitive color changes and these changes could be used for monitoring food freshness. Adding CNC to the AE/TPS matrix significantly improved the mechanical strength, thermal stability, and water vapor barrier (WVP) properties of the films up to a certain CNC (10%) concentration. Thermal analyses showed that CNC increased the thermal stability of AE/CNC/TPS films, and the AE/CNC10/TPS sample provided the best balance between mechanical strength, water vapor barrier, and flexibility. Microstructure analyses revealed a homogeneous distribution at low CNC concentrations, contributing to smoother and more compact film surfaces. Antioxidant capacity and total phenolic contents of the films were not significantly affected by the addition of CNC. Antibacterial tests showed that the films were particularly effective against Gram- negative bacteria, such as Escherichia coli, while they showed ineffective effects against Gram-positive bacteria, such as Staphylococcus aureus. Food application tests on chicken and tomatoes investigated the effect of the films on food quality preservation and monitoring. In general, AE/CNC/TPS films exhibit promising properties as smart packaging materials for use in the food packaging sector.

Subject Keywords

Aronia Extract, Cellulose Nanocrystal, Thermoplastic Starch, Active Packaging, Intelligent Packaging, Smart Packaging

URI

https://hdl.handle.net/11511/112718

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Graduate School of Natural and Applied Sciences, Thesis