Functionalized pectin/alginate food packaging films based on metal-phenol networks

It was focused on development a film with excellent properties. The pectin/sodium alginate (PS) composite films were developed by a casting technology, incorporating with tannic acid and Fe3+ for double cross-linking, and the effects of the film thickness, optical, mechanical, barrier, and antioxidant properties were investigated. This results displayed the inclusion of tannic acid (TA) and Fe3+ considerably increased the physical aspects, and they were very compatible with the matrix of the PS, exhibiting higher UV barrier capacity and lower gas permeability. On the other hand, the more compact structure observed by SEM as well as the hydrogen bonding interactions between the film components revealed by FTIR spectroscopy and XRD diffraction analyses further confirmed the significant enhancement of the properties. The functionalized coating of TA-Fe3+ demonstrated an improved adhesion and barrier properties, thereby effectively retarding the ageing process of golden passion fruit and this encompassed a decrease in the weight loss and a significant enhancement in water retention capability.