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Thin Film Composite Silicon Elastomers for Cell Culture and Skin Applications: Manufacturing and Characterization

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Published on: July 3, 2018

Intelligent Biopolymer-Based Films for Food Quality Monitoring.

Diana-Ionela Dăescu¹, Diana-Maria Dreavă¹, Florina Stoica²

¹Faculty of Chemical Engineering, Biotechnology and Environmental Protection, Politehnica University of Timisoara, Vasile Pârvan Blv. 6, 300223 Timişoara, Romania.

|March 28, 2026

Summary

New pH-responsive indicator films use synthetic flavylium dyes in biopolymer matrices for intelligent food packaging. These stable, nature-inspired films detect early meat spoilage, offering enhanced food safety and active packaging solutions.

Keywords:

biobased polymer film flavylium dyes food freshness indicator pH-responsive smart food packaging

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Area of Science:

Materials Science
Food Science
Polymer Chemistry

Background:

Intelligent food packaging utilizes pH-responsive indicator films to monitor food quality.
Natural colorants like anthocyanins have limitations in stability for these applications.
Synthetic, nature-inspired flavylium compounds offer a more stable alternative.

Purpose of the Study:

To synthesize and characterize novel 4'-aminoflavylium derivatives for pH-responsive indicator films.
To incorporate these synthetic dyes into biobased and biodegradable polymer matrices (PVA, chitosan-PVA, chitosan-starch).
To evaluate the pH responsiveness and colorimetric spoilage detection capabilities of the developed indicator films.

Main Methods:

Synthesis and characterization of five novel 4'-aminoflavylium derivatives.
Preparation of indicator films by embedding flavylium dyes or onion peel extract in polymer blends.
Testing of pH responsiveness across a pH range of 2-12.
Colorimetric assessment of film performance in monitoring meat spoilage (pork and fish) at different temperatures and times.

Main Results:

PVA and PVA-chitosan films with specific flavylium derivatives showed antioxidant activity, indicating potential for active packaging.
All indicator films demonstrated pH responsiveness.
The 7-hydroxy-4'-aminoflavylium derivative showed the earliest and most intense color change, effectively detecting early meat spoilage, outperforming dihydroxy derivatives.
Synthetic flavylium derivatives exhibited greater stability compared to natural onion peel extract.

Conclusions:

Novel synthetic 4'-aminoflavylium derivatives are suitable for creating stable, pH-responsive indicator films for intelligent food packaging.
These films can effectively monitor meat spoilage, offering a more stable alternative to natural colorants.
The developed indicator films present new opportunities for enhancing food safety and active packaging technologies.