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Bioplastics01:27

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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...

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Avocado Seed Starch-Based Films Reinforced with Starch Nanocrystals.

Pedro Francisco Muñoz-Gimena1, Alejandro Aragón-Gutiérrez2, Enrique Blázquez-Blázquez1

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Avocado seed starch (ASS) films reinforced with starch nanocrystals (SNCs) offer enhanced mechanical properties and biodegradability. These sustainable materials from food waste show potential for active food packaging applications.

Keywords:
active packagingantioxidantavocadobiobased filmsnanocrystalsseedstarch

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Area of Science:

  • Materials Science
  • Biochemistry
  • Sustainable Chemistry

Background:

  • Biopolymers from biomass offer biodegradability and circular economy advantages.
  • Avocado seeds, rich in starch, are a promising residue for biobased packaging.

Purpose of the Study:

  • To develop and characterize biodegradable films from avocado seed starch (ASS).
  • To enhance ASS films using starch nanocrystals (SNCs) and assess their properties for active food packaging.

Main Methods:

  • Solvent casting of ASS-based films with varying glycerol concentrations.
  • Preparation of SNCs via acid hydrolysis of ASS.
  • Characterization using SEM, XRD, TGA, and mechanical/permeability testing.

Main Results:

  • 1% SNC addition significantly increased elastic modulus (112%) and decreased water vapor permeability (30%).
  • ASS films exhibited high antioxidant capacity due to bioactive compounds.
  • All ASS-based films demonstrated rapid disintegration (48h) under lab-scale composting.

Conclusions:

  • Avocado seed starch and its nanocrystals are valuable for creating reinforced, biodegradable packaging.
  • These materials contribute to food waste valorization and the development of active, sustainable food packaging solutions.