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Sustainable Bioactive Packaging Based on Thermoplastic Starch and Microalgae.

Anna Martina Tedeschi¹, Fabrizio Di Caprio¹, Antonella Piozzi¹

¹Department of Chemistry, Sapienza University of Rome, 00185 Rome, Italy.

International Journal of Molecular Sciences

|January 11, 2022

Summary

Researchers developed novel antioxidant starch films using corn starch and microalgae for sustainable flexible packaging. These bioactive films enhance food preservation and align with EU plastic strategy goals.

Keywords:

antioxidant packaging flexible packaging food microalgae starch

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Area of Science:

Materials Science
Biotechnology
Food Science

Background:

Conventional plastics pose environmental challenges.
There is a growing demand for sustainable and bioactive packaging materials.
Microalgae offer a promising source of natural antioxidants.

Purpose of the Study:

To develop antioxidant starch-based films for flexible packaging.
To incorporate Tetradesmus obliquus microalgae as a natural antioxidant filler.
To evaluate the physical and antioxidant properties of the developed films.

Main Methods:

Corn starch was plasticized with glycerol and blended with polyallylamine.
Dried Tetradesmus obliquus microalgae were added as an antioxidant filler.
Film properties including water stability, water vapor transmission rate, mechanical strength, and antioxidant activity were assessed.

Main Results:

Polyallylamine addition improved film water stability, water vapor transmission rate, stiffness, and tenacity.
The microalgae-derived films exhibited significant antioxidant activity, increasing with microalgae content.
The EC₅₀ value of Tetradesmus obliquus was determined to be 2.8 mg/mg DPPH (2,2-Diphenyl-1-picrylhydrazyl radical).

Conclusions:

Sustainable, bioactive packaging films can be produced from starch and Tetradesmus obliquus microalgae.
The developed films offer a promising alternative to conventional plastics, contributing to food waste reduction.
This research aligns with the European Union's strategy for promoting bio-based and compostable plastics.