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The waste generated from fruits and vegetables presents significant environmental, economic, and social challenges for the food industry. This study investigates the potential of utilizing potato peels and lime pomace to develop sustainable biopolymer films as a solution to food waste management. Sixteen biopolymer samples were prepared using two methods: Method 1 without ultrasound treatment (8 samples), and Method 2 with 60 min of ultrasound treatment (8 samples). Both methods used varying glycerol concentrations (30%, 50%, 70%, and 100%) and a potato peel to lime pomace ratio of 0.5:1. Ultrasound treatment reduced biopolymer particle size, facilitating film formation. Four samples from each method were immersed in CaCl₂ solution after peeling off to enhance film properties, while the other four samples were simply peeled off without immersion. FTIR, TGA, and SEM analyses provided insights into material composition, thermal stability, and structural characteristics. Increasing glycerol concentration elevated moisture content and solubility while reducing water absorption. Ultrasound treatment reduced the water repellency of the films. The films’ thickness ranged from 0.30 ± 0.005 mm to 1 ± 0.005 mm. Regarding mechanical properties, the G30C sample showed better performance than the G100C sample, with both immersed in CaCl₂, with tensile strengths of 2.25 MPa and 2.05 MPa, and elongations at break of 10.62% and 5.18%, respectively. The G30 sample, not immersed in CaCl₂, had a lower tensile strength (0.55 MPa) and elongation (2.51%) compared to G30C, showing that CaCl₂ treatment improved mechanical performance. The UG30C sample demonstrated the lowest moisture content (21.46%) and solubility (49.65%) across all samples, indicating that ultrasound treatment and lower glycerol concentration (30%) significantly improved the mechanical and barrier properties. In conclusion, ultrasound treatment, reduced glycerol concentration, and CaCl₂ immersion effectively enhanced biopolymer film performance, offering a promising approach for sustainable packaging solutions.

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Valorisation of Fruit and Vegetable Wastes; Development of Biopolymers from Potato Peels and Lime Pomace

  • 会议论文

  • 发表日期：

    2025年

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  • D. M. M. L. Delpitiya,
  • D. D. I. T. Denipitiya,
  • M. A. Elangasinghe

摘要

The waste generated from fruits and vegetables presents significant environmental, economic, and social challenges for the food industry. This study investigates the potential of utilizing potato peels and lime pomace to develop sustainable biopolymer films as a solution to food waste management. Sixteen biopolymer samples were prepared using two methods: Method 1 without ultrasound treatment (8 samples), and Method 2 with 60 min of ultrasound treatment (8 samples). Both methods used varying glycerol concentrations (30%, 50%, 70%, and 100%) and a potato peel to lime pomace ratio of 0.5:1. Ultrasound treatment reduced biopolymer particle size, facilitating film formation. Four samples from each method were immersed in CaCl₂ solution after peeling off to enhance film properties, while the other four samples were simply peeled off without immersion. FTIR, TGA, and SEM analyses provided insights into material composition, thermal stability, and structural characteristics. Increasing glycerol concentration elevated moisture content and solubility while reducing water absorption. Ultrasound treatment reduced the water repellency of the films. The films’ thickness ranged from 0.30 ± 0.005 mm to 1 ± 0.005 mm. Regarding mechanical properties, the G30C sample showed better performance than the G100C sample, with both immersed in CaCl₂, with tensile strengths of 2.25 MPa and 2.05 MPa, and elongations at break of 10.62% and 5.18%, respectively. The G30 sample, not immersed in CaCl₂, had a lower tensile strength (0.55 MPa) and elongation (2.51%) compared to G30C, showing that CaCl₂ treatment improved mechanical performance. The UG30C sample demonstrated the lowest moisture content (21.46%) and solubility (49.65%) across all samples, indicating that ultrasound treatment and lower glycerol concentration (30%) significantly improved the mechanical and barrier properties. In conclusion, ultrasound treatment, reduced glycerol concentration, and CaCl₂ immersion effectively enhanced biopolymer film performance, offering a promising approach for sustainable packaging solutions.