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Optimizing the Functional Properties of Starch-Based Biodegradable Films.

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  • 1Department of Food Science and Technology, International Hellenic University, P.O. Box 141, 57400 Thessaloniki, Greece.

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Optimized starch packaging films with glycerol and montmorillonite (MMT) show enhanced strength and reduced permeability. These biodegradable films also inhibited bacterial growth, offering a sustainable alternative to commercial packaging.

Keywords:
antimicrobial abilitybiodegradabilitydefinitive screening designindustrial handlingmontmorilloniteoptimizationpackaging filmsstarch

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Area of Science:

  • Materials Science
  • Food Science
  • Biotechnology

Background:

  • Traditional plastic packaging poses environmental challenges.
  • Developing sustainable and functional food packaging is crucial.
  • Starch-based films offer biodegradable alternatives but require property optimization.

Purpose of the Study:

  • To optimize starch-based packaging film properties using a definitive screening design.
  • To evaluate the impact of starch concentration, glycerol, montmorillonite (MMT), drying temperature, tray type, and starch species.
  • To assess the functional properties, antibacterial activity, biodegradability, and industrial applicability of optimized films.

Main Methods:

  • Definitive screening design to evaluate multiple factors affecting film properties.
  • Optimization of starch concentration (5.5% wt), glycerol (30% wt), MMT (10.5% wt), drying temperature (45 °C), chickpea starch, and plexiglass tray.
  • Preparation and testing of optimized starch films for mechanical strength, water vapor permeability, opacity, antibacterial activity, biodegradability, and industrial rewinding.

Main Results:

  • Optimized conditions yielded films with minimal thickness, maximum elongation and tensile strength, reduced water vapor permeability, and low opacity.
  • Films with 10.5% wt MMT significantly decreased mesophilic and psychrotrophic bacteria growth compared to commercial packaging.
  • Starch films demonstrated complete disintegration within 10 days under simulated composting conditions and were successfully rewound using industrial machinery.

Conclusions:

  • A specific combination of formulation and processing parameters can significantly enhance the functional properties of starch-based packaging films.
  • The optimized starch-MMT films exhibit promising antimicrobial activity and biodegradability, making them a viable sustainable food packaging solution.
  • The films possess the necessary characteristics for potential industrial-scale production and application in food preservation.