Experimental Replication of a Reported pH-Sensitive Biopolymer Packaging Film under Resource-Limited Laboratory Conditions

This work presents a resource-constrained replication of a reported chitosan/poly(vinyl alcohol)/anthocyanin intelligent packaging film. The fabrication protocol was scaled to 50% reagent quantities and modified drying conditions while maintaining compositional ratios. The resulting film retained pH sensitivity and swelling behavior with rapid colorimetric response across acidic and basic environments. The study demonstrates reproducibility of intelligent packaging materials under limited laboratory infrastructure and supports feasibility in undergraduate teaching laboratories.