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Novel Bioactive Kefiran-Based Films Enriched with Grape Pomace Extract.

Rosalba Paola Islas-Enríquez1, Julia M Márquez-Reyes2, Juan G Báez-González1

  • 1Facultad de Ciencias Biológicas, Universidad Autónoma de Nuevo León, Av. Pedro de Alba S/N, Cd. Universitaria, San Nicolás de los Garza 66455, Mexico.

Polymers
|December 11, 2025
PubMed
Summary
This summary is machine-generated.

Kefiran-based films with grape pomace extract (GPE) show enhanced antioxidant and antimicrobial properties. These sustainable bioactive packaging materials offer a promising alternative for the food industry, utilizing wine by-products.

Keywords:
active packagingedible filmsgrape pomacekefiranphenolic compounds

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Area of Science:

  • Materials Science
  • Food Science
  • Biotechnology

Background:

  • Growing demand for sustainable and functional food packaging.
  • Need for biodegradable materials with bioactive properties.
  • Valorization of agricultural by-products like grape pomace.

Purpose of the Study:

  • To develop and characterize kefiran-based films incorporating grape pomace extract (GPE).
  • To evaluate the impact of GPE on physicochemical, mechanical, antioxidant, and antimicrobial properties.
  • To assess the potential of these films as sustainable bioactive food packaging.

Main Methods:

  • Preparation of kefiran films with varying GPE concentrations.
  • Physicochemical analysis (color, thickness, UV protection, solubility, water vapor permeability).
  • Mechanical testing (tensile strength, elongation at break).
  • FT-IR spectroscopy for structural analysis.
  • Antioxidant activity assays.
  • Antimicrobial assays against Listeria monocytogenes and Escherichia coli.

Main Results:

  • GPE incorporation enhanced film color (L*, a*, b*, ΔE), thickness, and UV protection.
  • FT-IR confirmed interactions between kefiran and GPE phenolics without structural damage.
  • GPE acted as a plasticizer, increasing tensile strength and elongation at break.
  • Antioxidant activity and total phenolic content significantly increased with GPE addition.
  • One formulation (3K-0.5GPE) showed antimicrobial activity against Listeria monocytogenes.

Conclusions:

  • Kefiran-GPE films are a viable sustainable alternative for bioactive food packaging.
  • GPE enhances functional properties and bioactive potential of kefiran films.
  • This approach promotes the valorization of wine industry by-products.