Valorization of Longan Seed Study on the Improvement of Parchment Using Dialdehyde Carboxymethyl Cellulose–Gelatin–Chitosan Composite Films Synthesis and Characterisation of Multifunctional Polymers for

Abstract

Research summary supplied by the authors

This study investigates the improvement of parchment’s physical properties using a dialdehyde carboxymethyl cellulose-gelatin-chitosan composite solution as a packaging material. The results indicate that the aldehyde groups in dialdehyde carboxymethyl cellulose form Schiff base linkages with the amino groups of chitosan, and establish covalent cross-linking with amino groups in parchment collagen fibers, thereby enhancing the structural integrity of the parchment. By impregnation treatment, the modified parchment exhibited a smoother surface, an increase in tensile strength to 16.60 kN/m, and a reduction in water vapor permeability to 0.059 mg/(cm²·h), indicating substantial improvements in mechanical strength barrier performance. This work provides a feasible modification method and a theoretical basis for expanding the application of parchment in the packaging field.