Abstract
In this study, a synthetic zeolite LTA was manufactured using glass waste and aluminum scrap as the main source of Si and Al. The as-synthesized zeolite was modified with zinc cation to improve its antibacterial property. The Zn-LTA was used to develop a gelatin-based biopolymer composites films. Mixing gelatin and Zn-LTA improved physicochemical and antibacterial characteristics of the produced films, remarkably. XRD, FTIR, SEM and TGA demonstrated a very good interaction between gelatin matrix and zeolite particles. Incorporation of zeolite into gelatin film resulted to a significant impact on the film thickness, water solubility, as well as the transparency of all composite films. In addition, the composite films exhibited high antibacterial and antioxidant activities compared to pure gelatin film. Several in vitro assays (reducing power, β-carotene bleaching inhibition and DPPH radical-scavenging activity) revealed that zeolite/gelatin composite films have higher antioxidant potential compared to the control gelatin films. The experimental results confirmed that the Zn-LTA/gelatin composite films can be considered as potential materials for development of active packaging for food preservation.
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