Cellulose-based peptidopolysaccharides as cationic antimicrobial package films

Area of Science:

• Materials Science
• Biotechnology
• Food Science

Background:

• Cellulose is a widely available biopolymer with potential for functionalization.
• Antimicrobial peptides like nisin offer natural protection against bacterial contamination.
• Developing sustainable and effective food packaging is crucial for reducing spoilage and waste.

Purpose of the Study:

• To synthesize and characterize novel peptidopolysaccharide films by grafting nisin onto dialdehyde cellulose.
• To evaluate the microstructure, mechanical properties, and water holding capacity of the developed films.
• To assess the antibacterial efficacy and application potential of these films as green food packaging.

Main Methods:

• Nisin peptide was grafted onto 2,3-dialdehyde cellulose using Schiff's base reaction.
• Characterization of the resulting peptidopolysaccharide films included microstructure analysis, water holding capacity, and mechanical testing.
• Antibacterial activity was tested against Gram-positive and Gram-negative bacteria.
• The films were applied as packaging for fresh pork to evaluate shelf-life extension.

Main Results:

• The peptidopolysaccharide films exhibited a denser microstructure, reduced water holding capacity, and improved mechanical properties compared to pristine cellulose.
• Significant antibacterial activity was observed against both Gram-positive and Gram-negative bacteria.
• The N-3 peptidopolysaccharide film demonstrated a four-orders-of-magnitude higher bacteriostatic ability than pure cellulose.
• Packaging fresh pork with the N-3 peptidopolysaccharide film extended its shelf-life by at least six days compared to polyethylene wrap.

Conclusions:

• The synthesized peptidopolysaccharide films possess enhanced properties and potent antibacterial activity.
• These films effectively inhibit bacterial growth and reduce spoilage in food products.
• Peptidopolysaccharide films show significant potential as a sustainable and effective green food packaging material.