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Marina L C Chaves1, Guilherme A M Jesus2, Michael C Castro2

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Biodegradable pectin/starch films offer a sustainable alternative for fresh pear packaging. The optimized pectin-100 film demonstrated excellent UV blocking and extended fruit freshness for 15 days, outperforming uncoated pears.

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Area of Science:

  • Materials Science
  • Food Science
  • Polymer Science

Background:

  • Petroleum-based packaging poses environmental concerns.
  • Polysaccharide-based films offer a biodegradable alternative.
  • Pectin and starch are abundant, renewable resources for film development.

Purpose of the Study:

  • To develop, optimize, and characterize biodegradable pectin/starch films for fresh pear packaging.
  • To evaluate the physical, optical, thermal, and mechanical properties of the films.
  • To assess the efficacy of the films in preserving fresh pear quality during storage.

Main Methods:

  • Film formulation and optimization using Simplex lattice mixture design.
  • Characterization using optical microscopy, UV-Vis spectroscopy, thermal analysis (TGA), water vapor transmission rate (WVTR) testing, oil permeability testing, scanning electron microscopy (SEM), mechanical testing (tensile strength, Young's modulus, elongation at break), and water solubility/swelling tests.
  • Application of optimized film on fresh pears and storage study with visual assessment.

Main Results:

  • Developed stable, transparent films with efficient UV blocking (UVC-UVB, partial UVA).
  • Films exhibited good water vapor permeability and oil impermeability.
  • The 100% pectin film (Pec-100) showed superior mechanical resistance, low water vapor permeability, high transparency, and rigidity.
  • Pec-100 coated pears remained fresh for 15 days, while uncoated pears showed degradation after 10 days.

Conclusions:

  • Optimized pectin/starch films, particularly the Pec-100 formulation, are suitable for fresh pear packaging.
  • These biodegradable films enhance fruit preservation and extend shelf life.
  • Renewable-source-based films present a viable and sustainable alternative to conventional packaging materials.