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Optimized pH-responsive film based on a eutectic mixture-plasticized chitosan.

Pamela F Pereira1, Cristina T Andrade2

  • 1Programa de Pós-Graduação em Ciência de Alimentos, Instituto de Química, Universidade Federal do Rio de Janeiro, Avenida Athos da Silveira Ramos 149, 21941-909 Rio de Janeiro, RJ, Brazil.

Carbohydrate Polymers
|April 2, 2017
PubMed
Summary

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This summary is machine-generated.

This study developed chitosan-based films incorporating microcrystalline cellulose and a deep eutectic solvent (DES) for food indication. The optimized DES-plasticized film exhibited enhanced thermal stability and significant color changes at higher pH levels.

Area of Science:

  • Materials Science
  • Polymer Science
  • Food Science

Background:

  • Chitosan (CS) films are explored for food packaging and indicator applications.
  • Enhancing chitosan film properties requires effective plasticizers and reinforcing agents.
  • Deep eutectic solvents (DES) offer tunable properties as potential plasticizers.

Purpose of the Study:

  • To develop and optimize chitosan-based films for food indication.
  • To investigate the effects of microcrystalline cellulose (MCC) and DES on film properties.
  • To compare DES-plasticized films with unplasticized and glycerol-plasticized counterparts.

Main Methods:

  • Preparation of chitosan/curcumin films with varying MCC and DES content.
  • Optimization of MCC (133 mas%) and DES (7.93 mass%) based on CS dry mass.
Keywords:
ChitosanChitosan (PubChem CID: 71853)Choline chloride (PubChem CID: 6209)CurcuminCurcumin (PubChem CID: 969516)Eutectic mixtureGlycerol (PubChem CID: 753)Intelligent packagingMicrocrystalline celluloseMicrocrystalline cellulose (PubChem CID: 62698)

Related Experiment Videos

  • Characterization of film properties: thermal stability, glass transition, water vapor permeability, solubility, mechanical strength, and color changes.
  • Colorimetric testing in aqueous environments at different pH levels.

    • Main Results:

    • The optimized DES-plasticized film showed a decomposition temperature of 267.7°C and a glass transition temperature of 149.3°C.
    • Water vapor permeability was 7.21×10⁻¹⁰ gs⁻¹m⁻¹Pa⁻¹, water solubility was 3.07%, and stress at break was 20.1 MPa.
    • MCC incorporation increased film crystallinity.
    • The DES-plasticized film displayed significant color changes, particularly above pH 8.

    Conclusions:

    • Optimized chitosan/curcumin films plasticized with DES and reinforced with MCC show promising properties for food indicator applications.
    • The developed films possess good thermal stability and mechanical strength.
    • The pH-dependent color change indicates potential for use as visual food spoilage or quality indicators.