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Bacterial Cellulose Spheres that Encapsulate Solid Materials
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Self-Grown Bacterial Cellulose Capsules Made through Emulsion Templating.

Martina Pepicelli1, Marco R Binelli2, André R Studart2

  • 1Institute of Food, Nutrition and Health, ETH Zurich, Zurich 8092, Switzerland.

ACS Biomaterials Science & Engineering
|June 30, 2021
PubMed
Summary

Researchers developed biodegradable cellulose microcapsules using bacteria, offering an eco-friendly alternative to synthetic polymers for various applications. This innovation utilizes bacterial biofilms for self-assembly and tunable capsule properties.

Keywords:
Acetobacter xylinumbacteria cellulosebiofilminterfacial rheologymicrocapsulesmicrofluidics

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Area of Science:

  • Biomaterials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Synthetic polymer microcapsules pose environmental degradation challenges.
  • Bacterial biofilms, particularly cellulose produced by *Gluconacetobacter xylinus*, offer a novel biomaterial source.
  • Bacterial cellulose exhibits excellent mechanical properties and self-assembly capabilities.

Purpose of the Study:

  • To design and optimize self-grown bacterial cellulose microcapsules.
  • To explore bacterial cellulose as a biodegradable alternative to synthetic microcapsules.
  • To investigate the potential of bacterial cellulose for cargo encapsulation and stabilization of emulsions.

Main Methods:

  • Utilized *Gluconacetobacter xylinus* for biofilm and cellulose production.
  • Employed a microfluidic setup for controlled emulsification and capsule formation.
  • Investigated the influence of bacteria concentration, droplet size, and surfactant type on capsule formation and stability.

Main Results:

  • Successfully produced tunable and monodisperse bacterial cellulose capsules.
  • Demonstrated bacterial cellulose capsules as effective stabilizers for water-in-oil emulsions.
  • Identified key parameters (bacteria concentration, droplet size, surfactant) influencing capsule formation.

Conclusions:

  • Bacterial cellulose microcapsules represent a significant advancement in biodegradable encapsulation technology.
  • This self-assembly method offers a sustainable approach for producing microcapsules.
  • Potential applications include encapsulation of flavors, fragrances, agrochemicals, nutrients, and drugs.