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Reactive Extrusion of Nonmigratory Active and Intelligent Packaging.

Halle N Redfearn1, Matthew K Warren1, Julie M Goddard1

  • 1Department of Food Science, 365 Stocking Hall, Cornell University, Ithaca, New York 14853, United States.

ACS Applied Materials & Interfaces
|June 9, 2023
PubMed
Summary

Researchers developed active and intelligent food packaging using curcumin-grafted polypropylene (PP-g-Cur). This novel material prevents spoilage, indicates microbial growth via color change, and offers antioxidant properties, reducing food waste.

Keywords:
active packagingcurcuminfunctional polymernonmigratoryreactive extrusion

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Area of Science:

  • Materials Science
  • Food Science
  • Polymer Chemistry

Background:

  • Food waste is a significant environmental and economic issue, driven by spoilage from moisture, oxygen, and microbes.
  • Traditional food additives have limitations, and consumer demand for "clean label" products necessitates innovative preservation technologies.
  • Active and intelligent packaging offers a promising solution for preventing and detecting food spoilage.

Purpose of the Study:

  • To develop a nonmigratory active and intelligent packaging material by grafting curcumin onto polypropylene (PP-g-Cur).
  • To evaluate the functional properties of PP-g-Cur, including UV blocking, antioxidant activity, antimicrobial potential, and spoilage indication.
  • To demonstrate a scalable, solvent-free method for producing advanced food packaging.

Main Methods:

  • Curcumin was grafted to polypropylene using reactive extrusion, creating PP-g-Cur.
  • Migration assays were performed to assess curcumin immobilization.
  • UV-Vis spectroscopy, radical scavenging assays, microbial inhibition tests (E. coli, L. monocytogenes), and ammonia exposure tests were conducted.

Main Results:

  • PP-g-Cur exhibited minimal curcumin migration (<0.011 mg/cm2), well below EU limits.
  • PP-g-Cur films effectively blocked 93% of UV light while maintaining 64% visible light transparency.
  • Films showed significant antioxidant activity and a color change from yellow to red upon exposure to ammonia, indicating spoilage.
  • Antimicrobial activity against E. coli and L. monocytogenes was limited, similar to free curcumin.

Conclusions:

  • Reactive extrusion provides a scalable, solvent-free method for producing active and intelligent polypropylene-based packaging (PP-g-Cur).
  • PP-g-Cur packaging offers UV protection, antioxidant properties, and spoilage detection capabilities via visual color change.
  • This technology has the potential to reduce food waste and enhance the functionality of packaging materials.