The packaging problem with petroleum-based synthetic polymers prompts the development of edible packaging films. The high value-added reuse of navel orange peel pomace, which is rich in bioactive compounds, merited more considerations. Herein, nanocellulose (ONCC) and soluble dietary fiber (OSDF) from navel orange peel pomace are firstly used to prepare dietary fiber-based edible packaging films using a simple physical blend method, and the impact of ONCC on the film’s properties is analyzed. Adopting three methods in a step-by-step approach to find the best formula for edible packaging films. The results show that dietary-fiber-based edible packaging films with 4 wt.% ONCC form a network structure, and their crystallinity, maximum pyrolysis temperature, and melting temperature are improved. What’s more, dietary-fiber-based edible packaging films have a wide range of potential uses in edible packaging.

A new bio-based polyamide 56/512 (PA56/512) has been synthesized with a higher bio-based composition compared to industrialized bio-based PA56, which is considered a lower carbon emission bio-based nylon. In this paper, the one-step approach of copolymerizing PA56 units with PA512 units using melt polymerization has been investigated. The structure of the copolymer PA56/512 was characterized using Fourier-transform infrared spectroscopy (FTIR) and Proton nuclear magnetic resonance (¹H NMR). Other measurement methods, including relative viscosity tests, amine end group measurement, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), were used to analyze the physical and thermal properties of the PA56/512. Furthermore, the non-isothermal crystallization behaviors of PA56/512 have been investigated with the analytical model of Mo’s method and the Kissinger method. The melting point of copolymer PA56/512 exhibited a eutectic point at 60 mol% of 512 corresponding to the typical isodimorphism behavior, and the crystallization ability of PA56/512 also displayed a similar tendency.

In this study, dual-functional cellulose nanocrystal/zinc oxide hybrids (ONCC@ZnONP) were constructed from navel orange peel pomace. The incorporation of these hybrids systematically improved the overall properties of OSDF-based antibacterial active packaging films. A series of antibacterial active packaging films (O/CZ) were successfully prepared using OSDF as the matrix and ONCC@ZnONP as the active filler. The effects of different ONCC@ZnONP loadings on the microstructure, physical properties, and antibacterial properties of the films were systematically analyzed. The results showed that ONCC@ZnONP was uniformly dispersed within the OSDF matrix, exhibiting favorable interfacial compatibility. The incorporation of ONCC@ZnONP significantly enhanced the tensile strength, UV-shielding property, and antibacterial activity of the O/CZ films. In the blueberry preservation application, the decay rate of the O/CZ films decreased with increasing ZnO loading. Based on the comprehensive balance of antibacterial preservation and physical quality maintenance, the O/CZ8 film (8 wt% ONCC@ZnONP) showed the optimal preservation performance. Specifically, it showed a weight loss of 9.67%, maintained a firmness of 9.07 N, and achieved a decay rate reduction of 78.74% compared to the OSDF/SA film. These results showed that the developed antibacterial active packaging films hold great potential for food packaging and preservation applications.