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Biodegradable Polymer Packaging System for 'Benitaka' Table Grapes during Cold Storage.

Ricardo Josue Silva¹, Aline Cristina de Aguiar¹, Bruno Matheus Simões¹

¹Agricultural Research Center, State University of Londrina, Celso Garcia Cid Road, km 380, P.O. Box 10.011, Londrina 86057-970, Brazil.

|January 26, 2024

Summary

This study developed a biodegradable packaging system using starch, glycerol, and PBAT films to preserve

Keywords:

Botrytis cinerea Vitis vinifera L.bio-based liners cold storage sulfur dioxide

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Area of Science:

Food Science and Technology
Materials Science
Agricultural Engineering

Background:

Gray mold (caused by *Botrytis cinerea*) is a major postharvest disease affecting table grape quality.
Conventional preservation methods often involve synthetic materials and chemicals with environmental concerns.
Biodegradable packaging offers a sustainable alternative for extending the shelf life of fresh produce.

Purpose of the Study:

To develop and evaluate a biodegradable polymer packaging system incorporating sulfur dioxide (SO2)-releasing sachets for 'Benitaka' table grapes.
To inhibit gray mold development and maintain grape quality during refrigerated storage.

Main Methods:

Biodegradable films (starch, glycerol, PBAT) were produced via blown extrusion and characterized for physical properties.
Table grapes were packaged in biodegradable bags with sachets containing varying amounts of sodium metabisulfite (Na2S2O5) and silicon dioxide (SiO2).
Grapes were stored at 1°C and >90% RH for 45 days, with quality assessments including gray mold incidence, mass loss, and visual attributes.

Main Results:

The biodegradable films exhibited suitable processability and physical characteristics for grape packaging and SO2-releasing sachets.
The developed packaging system effectively inhibited gray mold development on 'Benitaka' table grapes for up to 45 days at 1°C.
Treated grapes showed significantly lower mass loss, reduced berry shattering, and maintained stem freshness compared to controls.

Conclusions:

Biodegradable polymer packaging integrated with SO2-releasing sachets is a viable strategy for extending the shelf life of 'Benitaka' table grapes.
This sustainable approach effectively controls postharvest gray mold and preserves overall grape quality attributes.
The system demonstrates potential for reducing food waste and environmental impact in the table grape supply chain.