Sustainable Active Packaging from On-Demand Degradable PLA/PBAT and Zn-Doped TiO<sub>2</sub> Composites
Nattawut Yuntawattana, Thanapat Buaban, Teerapat Siri
Abstract
High Resolution Image Download MS PowerPoint Slide Shelf life extendable packaging and ethylene scavenger technologies for climacteric fruits and vegetables have garnered much attention in recent years. These products effectively enable food quality to be maintained, ensure food safety, and prolong food storage life, which are key to helping reduce food waste. Current technologies – both in terms of academic research and broader commercial application – imply the use of chemicals that are of low activity, of high toxicity, or difficult to handle. Therefore, in this work, we prepared Zn-doped TiO 2 photocatalysts, containing 0.1 and 2.0 mol % of Zn dopant ( Zn 0.1% -TiO 2 and Zn 2% -TiO 2 ), through a simple sol–gel method, which were then applied to be used as ethylene scavenger fillers in the preparation of on-demand degradable active packaging. TiO 2 particles were also prepared under identical conditions for comparison. The active composite film containing Zn 0.1% -TiO 2 was shown to be a better active packaging than the one containing TiO 2 and was able to extend the shelf life of bananas for up to 8 days. In addition, the incorporation of Zn-doped TiO 2 particles did not significantly compromise either the mechanical properties of the polymer composite film or change its degradation behavior; it slightly improved the thermal stability. Moreover, the active composite film could be degraded on demand by immersing it into a 3 M KOH solution – leading to almost complete polymer film degradation after 4 h at room temperature. The developed active packaging model is a very promising candidate and could serve for future optimization as sustainable active food packaging.