Engineering Starch for Sustainable Food Packaging: A Critical Review of Structural Limitations, Modification...

Area of Science:

• Materials Science
• Food Science
• Sustainable Packaging

Background:

• Conventional plastics cause pollution and greenhouse gas emissions.
• Starch is a renewable, biodegradable alternative but has limitations like poor moisture resistance and brittleness.
• Native starch films lack antimicrobial and antioxidant properties needed for modern food packaging.

Purpose of the Study:

• To review advancements in starch-based films for food packaging.
• To analyze modification strategies for improving starch film performance.
• To explore the development of active and intelligent starch-based packaging systems.

Main Methods:

• Examining the impact of molecular structure, granule morphology, and botanical source on film properties.
• Evaluating physicochemical, enzymatic, and composite modification techniques.
• Incorporating biopolymers, nanofillers, lipids, and bioactive compounds into starch films.

Main Results:

• Modification strategies significantly improve mechanical strength, barrier properties, and stability of starch films.
• Starch-based materials are transitioning to active and intelligent systems with antimicrobial, antioxidant, and freshness monitoring functions.
• Key challenges include scale-up, cost, safety, migration, and regulatory acceptance.

Conclusions:

• Starch-based films show great promise for developing multifunctional, safe, and sustainable food packaging.
• Further research should focus on waste valorization and life cycle assessment within circular economy principles.
• Overcoming challenges is crucial for the widespread adoption of these eco-friendly packaging solutions.