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Biofilms01:29

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Biofilms are complex communities of microorganisms encased in a self-produced extracellular polysaccharide matrix attached to surfaces. These microbial consortia can include single or multiple species, providing enhanced survival benefits by forming organized, multilayered structures.The formation of biofilms occurs through four key stages: attachment, colonization, development, and dispersal.During attachment, free-swimming planktonic cells adhere to a surface, often facilitated by...
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A polyhydroxyalkanoate-based encapsulating strategy for 'bioplasticizing' microorganisms.

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Researchers developed polyhydroxyalkanoate (PHA)-based microcapsules (MPs) to protect microorganisms. These biocompatible MPs enhance bacterial survival in harsh conditions, showing potential for biotechnological applications.

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Area of Science:

  • Biomaterials Science
  • Microbiology
  • Chemical Engineering

Background:

  • Biocompatible and biodegradable nano- and microcarriers are crucial for medical and biotechnological uses.
  • Microencapsulation enhances microbial survival and stability in challenging environments.
  • Polyhydroxyalkanoates (PHAs) are promising biodegradable polymers for carrier development.

Purpose of the Study:

  • To develop and characterize polyhydroxyalkanoate (PHA)-based microcapsules (MPs) for encapsulating microorganisms.
  • To evaluate the stability and stress tolerance of PHA-based MPs.
  • To demonstrate the applicability of this microencapsulation technique for different bacterial strains.

Main Methods:

  • Modified double emulsion solvent evaporation technique used for microencapsulation.
  • Polyhydroxyalkanoate (PHA) polymer utilized for microcapsule fabrication.
  • Pseudomonas putida KT2440 and Bdellovibrio bacteriovorus used as model microorganisms.
  • Particle size analysis, morphology observation, and stability testing under various storage and stress conditions (temperature, pH, H2O2).

Main Results:

  • Spherical PHA-based MPs with an average particle size of 10 μm were successfully produced.
  • MPs demonstrated stability for at least 24 days when stored at 4°C in aqueous suspension.
  • Encapsulated Pseudomonas putida KT2440 cells showed enhanced viability under alkaline conditions (2 hours) and oxidative stress (24 hours exposure to 10-20 mM H2O2).
  • The method was validated by successful encapsulation of the predatory bacterium Bdellovibrio bacteriovorus.

Conclusions:

  • PHA-based microcapsules offer a robust platform for protecting microorganisms.
  • The developed microencapsulation technique provides significant stability and stress tolerance for encapsulated bacteria.
  • This method holds promise for biotechnological applications involving microbial cells under demanding environmental conditions.