Air-Assisted Sprayed Flexible Cellulose Acetate/Chitosan Materials for Food Packaging

Area of Science:

• Materials Science
• Polymer Science
• Biotechnology

Background:

• Cellulose and chitin are abundant biopolymers with potential for sustainable materials.
• Developing flexible, bioactive films from these polymers is crucial for advanced applications.

Purpose of the Study:

• To investigate the preparation of cellulose-chitosan composite films using air-assisted solution spraying (AASS).
• To evaluate the mechanical, physical, and biological properties of these novel films.

Main Methods:

• Utilized air-assisted solution spraying (AASS) to create composite films from acetylated cellulose and chitosan.
• Characterized film morphology, mechanical properties (Young's modulus, tensile strength, strain at failure), wettability, and bioactivity against E. coli.

Main Results:

• Achieved highly flexible films (Young's moduli < 1 GPa) with excellent mechanical properties (tensile strength > 19 MPa).
• Increased chitosan content enhanced hydrophobicity and oleophobicity, improving protective qualities for food packaging.
• A chitosan content of 7.5% w/w demonstrated significant bioactivity against E. coli.

Conclusions:

• AASS is a viable and efficient technique for producing uniform, flexible, and bioactive cellulose-chitosan films.
• These films show great promise for sustainable food packaging applications due to their protective and antimicrobial properties.
• The method offers advantages in terms of faster drying and reduced energy consumption compared to traditional techniques.