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Preparation and Characterization of Pullulan-Based Packaging Paper for Fruit Preservation
1State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
New pullulan-based packaging paper extends fruit shelf life. This biodegradable material improves fruit preservation by reducing weight loss and maintaining quality, offering a sustainable solution for the food industry.
Area of Science:
- Food Science and Technology
- Materials Science
- Biotechnology
Background:
- Improving fruit shelf life is a significant challenge in food preservation.
- Biodegradable pullulan offers excellent film-forming and gas barrier properties, suitable for packaging.
- Existing fruit packaging technologies face issues with high cost and film porosity.
Purpose of the Study:
- To develop cost-effective, low-porosity pullulan-based packaging paper for enhancing fruit shelf life.
- To evaluate the impact of pullulan coatings with additives on packaging paper properties.
- To assess the effectiveness of pullulan-based paper in preserving grape quality during storage.
Main Methods:
- Coating base packaging paper with pullulan solutions of varying viscosities (75.6, 77.8, 108.5 mPa·s).
- Incorporating additives such as tea polyphenols and vitamin C into the pullulan coating.
- Measuring oxygen transmission rate, water vapor transmission rate, free radical clearance, and antibacterial activity.
- Evaluating grape quality parameters including weight loss, hardness, total soluble solids, soluble protein, titratable acidity, and ascorbic acid content after storage.
Main Results:
- Pullulan-based paper coatings significantly improved barrier properties (oxygen and water vapor transmission rates).
- Enhanced antioxidant (free radical clearance >87%) and antibacterial activities were observed.
- Grapes wrapped in pullulan-based paper showed reduced weight loss (>4.41%) and maintained better hardness (>16.4%) after 10 days.
- Preserved grapes exhibited higher total soluble solids (>12.6 wt.%), soluble protein (>1.5 mg/g), titratable acidity (>0.44 wt.%), and ascorbic acid (≥4.5 mg 100 g⁻¹).
Conclusions:
- Pullulan-based packaging paper effectively enhances the shelf life of grapes.
- The developed material offers improved barrier, antioxidant, and antibacterial properties.
- This innovation provides a convenient and valuable solution for sustainable fruit preservation.
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