Agar-carboxymethyl cellulose-based antimicrobial active film containing potassium sorbate

Abstract

Biodegradable edible biopolymers derived from renewable agricultural sources offer a promising alternative to synthetic plastics. This study focused on preparing agar-carboxymethyl cellulose films containing glycerol (20-60%) and potassium sorbate (0-20%). Film properties such as thickness, water vapor permeability, water solubility, moisture absorption, water drop contact angle, and color characteristics were evaluated. The films were also tested for antibacterial and anti-mold properties against three bacterial species and two mold species. Results indicated that the composition of glycerol and potassium sorbate significantly influenced film solubility and moisture absorption (p< 0.05). The films exhibited high water drop contact angles, indicating low hydrophilicity. Potassium sorbate and glycerol notably affected the color parameters (L, a, b, and yellow index) of the films. Antimicrobial tests revealed effective antibacterial and antifungal properties, with the level of potassium sorbate showing a significant impact (p < 0.05) on these properties. In conclusion, utilizing cost-effective biopolymers and incorporating antimicrobial agents like potassium sorbate not only supports environmental sustainability but also enhances film properties and inhibits microbial growth.

Keywords

• agar
• carboxymethyl cellulose
• potassium sorbate
• antimicrobial film