Natural Polysaccharide-Based Films and their Antibacterial Activities

The polysaccharides from seeds ofCassia fistulaandDelonix regiawere used to prepare the films. After added withQuercus infectoriaextracts, films were evaluated for the antibacterial properties by disk diffusion assay. The obtained results showed that the films exhibited antibacterial activity against both gram-positive (Bacillus subtilisandStaphylococcus aureus) and gram-negative (Escherichia coli) bacterium. The inhibition of bacterial was also observed under scanning electron microscopy (SEM). After treated with the antibacterial films, the shape of bacterial cells loses uniformity and become leaky and unhealthy.