Exploring lignin nanoparticle incorporation to develop multifunctional cellulose nanofibril films for active...

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Cellulose nanofibrils (CNF) are promising for packaging due to inherent barrier properties.
• Developing active and multifunctional packaging materials is crucial for food preservation.
• Lignin nanoparticles (LNPs) offer potential functional additives for bioplastics.

Purpose of the Study:

• To synthesize and evaluate CNF films incorporating LNPs for active and multifunctional packaging.
• To investigate the impact of LNPs on the barrier, functional, and physical properties of CNF films.
• To assess the performance of CNF/LNP films in food packaging simulations.

Main Methods:

• Synthesis of CNF films with varying LNP concentrations.
• Comprehensive characterization including chemical, morphological, mechanical, thermal, optical, and surface analysis.
• UV-blocking, antimicrobial, and antioxidant activity assays; LNP migration studies; food packaging simulations with raspberries.

Main Results:

• LNPs self-assembled on the film surface, affecting roughness and wettability but minimally impacting bulk properties.
• UV-blocking (>87%) and antioxidant activity (up to 27.89% RSA) increased with LNP loading.
• CNF/LNP films demonstrated antimicrobial effects, maintained mechanical strength (105-126 MPa) and oxygen barrier performance, and extended raspberry shelf life.
• LNP migration was within regulatory limits (<60 mg/kg).

Conclusions:

• Incorporating LNPs into CNF films imparts valuable functional properties like UV-blocking and antioxidant activity.
• CNF/LNP films maintain structural integrity and barrier performance, showing potential for active food packaging.
• These novel materials outperform conventional plastics in extending food shelf life, offering a sustainable packaging solution.