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Dynamic Modulation of SO

Shihua Mai1, Yue Ma1, Hongsheng Liu1,2

  • 1School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China.

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Summary
This summary is machine-generated.

A new starch-based foam packaging infused with sodium metabisulfite (Na2S2O5) effectively preserves perishable fruits. This innovative material releases sulfur dioxide (SO2) to inhibit fungal growth, extending shelf life and maintaining nutritional quality.

Keywords:
antisepsiscushioningfresh-keepingsandwich-like inner structurestarch-based foam package

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Area of Science:

  • Food Science and Technology
  • Materials Science
  • Agricultural Engineering

Background:

  • Highly perishable, high-value fruits require advanced preservation methods to minimize post-harvest losses.
  • Current packaging solutions often lack integrated active components for extended shelf-life extension.
  • Developing sustainable and effective packaging is crucial for the food industry.

Purpose of the Study:

  • To develop and characterize a novel starch-based foam packaging material for preserving fresh fruits.
  • To investigate the controlled release of sulfur dioxide (SO2) from the foam as an antifungal agent.
  • To evaluate the efficacy of the foam in maintaining the quality and nutritional value of fresh grapes during storage.

Main Methods:

  • Fabrication of a starch-based foam incorporating sodium metabisulfite (Na2S2O5).
  • Characterization using Scanning Electron Microscopy (SEM), moisture absorption, and mechanical tests.
  • Assessment of SO2 release kinetics and antifungal performance against grape spoilage.
  • Evaluation of grape quality parameters (appearance, soluble solids, total acidity, Vitamin C) over 21 days.

Main Results:

  • The foam possesses a unique sandwich-like structure enabling modulable SO2 release and ~100% resilience for cushioning.
  • Stable release of over 100 ppm SO2 was achieved with 25 g/m2 Na2S2O5 application.
  • Demonstrated satisfactory antifungal performance (>60% inhibition) and preservation of grape quality (e.g., Vitamin C, soluble solids).
  • Residual SO2 levels remained within safe limits (<30 mg/kg).

Conclusions:

  • The novel starch-based foam packaging effectively preserves fresh grapes by controlled SO2 release.
  • The material offers excellent cushioning properties and antifungal activity, meeting safety standards.
  • This innovative packaging presents significant potential for application in the food industry to reduce spoilage and extend shelf life.