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Polylactic acid-based materials encapsulating carvacrol obtained by solvent casting and electrospinning.

Alina Tampau1, Chelo González-Martínez1, Amparo Chiralt1

  • 1Universidad Politécnica de Valencia, Valencia, Spain.

Journal of Food Science
|March 8, 2020
PubMed
Summary

Electrospun polylactic acid (PLA) fibers loaded with carvacrol (CA) show potential for active food packaging. Encapsulating efficiency was higher with ethyl acetate (EtAc) in the solvent system.

Keywords:
carvacrolcastingdimethyl sulfoxideelectrospinningethyl acetatepolylactic acid

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Area of Science:

  • Materials Science
  • Polymer Science
  • Food Science

Background:

  • Active food packaging aims to extend shelf life and maintain food quality.
  • Polylactic acid (PLA) is a biodegradable polymer with potential for food packaging applications.
  • Carvacrol (CA) possesses antimicrobial and antioxidant properties beneficial for active packaging.

Purpose of the Study:

  • To develop carvacrol-loaded polylactic acid (PLA) matrices using electrospinning and solvent casting.
  • To investigate the effect of solvent systems (ethyl acetate/dimethyl sulfoxide) on carvacrol encapsulation.
  • To evaluate the properties of carvacrol-loaded PLA for potential use in active food packaging.

Main Methods:

  • Electrospinning and solvent casting techniques were employed to create PLA matrices.
  • Field emission scanning electron microscopy (FESEM) was used to analyze fiber morphology.
  • Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) assessed thermal properties and solvent retention.

Main Results:

  • Electrospun fibers loaded with carvacrol (CA) were thinner than CA-free fibers.
  • Encapsulating efficiency (EE) of CA was influenced by the ethyl acetate (EtAc) content in the solvent system.
  • Solvent cast films exhibited higher EE (up to 89%) compared to electrospun mats (maximum 68%).
  • PLA matrices retained less solvent when loaded with CA, indicating stronger CA retention forces in electrospun fibers.

Conclusions:

  • Carvacrol-loaded PLA materials can be produced via electrospinning and solvent casting.
  • The solvent system significantly impacts the encapsulation efficiency and morphology of PLA matrices.
  • These carvacrol-loaded PLA materials show promise as active layers in multilayer food packaging systems.