Active Starch Films Incorporated with Citrus Essential Oils: Properties, Bioactivity, and Biodegradability

Area of Science:

• Materials Science
• Food Science
• Biotechnology

Background:

• Growing demand for sustainable food preservation methods.
• Need for biodegradable alternatives to petroleum-based plastics in packaging.
• Potential of natural compounds like citrus essential oils in active packaging.

Purpose of the Study:

• To develop and evaluate bioactive starch-based films incorporating citrus peel essential oils (lemon, orange, tangerine).
• To assess the physical, chemical, mechanical, antimicrobial, structural, thermal, biodegradation, and phytotoxicity properties of these films.

Main Methods:

• Incorporation of citrus essential oils (0.5-2% w/w) into starch-based films.
• Evaluation of film properties: physical, chemical, mechanical, antimicrobial, structural (XRD, SEM, FTIR), thermal (TGA/DTG), transparency, soil biodegradation, and phytotoxicity.
• Focus on formulations with 1% and 2% essential oil content for detailed characterization.

Main Results:

• FTIR analysis indicated physical interactions between essential oils and starch, without altering starch's chemical structure.
• Citrus essential oils modulated the physical and mechanical properties of the starch films.
• Films with lemon and tangerine oils demonstrated significant antimicrobial activity against foodborne pathogens.
• Biodegradation was concentration-dependent, with over 50% mass loss in 15 days.
• Phytotoxicity assays confirmed the environmental safety of the degraded film residues.

Conclusions:

• Developed citrus-infused starch films show promise as active biodegradable packaging materials.
• These films can potentially extend the shelf life of bakery products.
• The study highlights a viable strategy to reduce plastic waste through sustainable packaging solutions.