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Related Experiment Video

Updated: Jun 7, 2026

Particle Templated Emulsification enables Microfluidic-Free Droplet Assays
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Published on: March 9, 2021

Bacterial Pickering emulsion stability quantified using microfluidic droplet coalescence tests.

Xiaojie Li1, Kohei Takahashi1, Nozomu Obana2

  • 1Graduate School of Science and Technology, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8577, Japan.

Colloids and Surfaces. B, Biointerfaces
|June 5, 2026
PubMed
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Researchers explored using bacteria as active stabilizers for Pickering emulsions. They found that bacterial charge and hydrophobicity influence emulsion stability, with some bacteria promoting coalescence at higher concentrations via bridging mechanisms.

Area of Science:

  • Colloid and Interface Science
  • Biomaterials Engineering
  • Microbiology

Background:

  • Pickering emulsions are traditionally stabilized by passive colloids.
  • Active bacteria offer enhanced functionality but present surface complexity challenges.
  • Understanding bacterial-interface interactions is crucial for their application.

Purpose of the Study:

  • To develop a framework for understanding bacterial-interface interactions in Pickering emulsions.
  • To investigate bacterial surface properties influencing emulsion stabilization.
  • To evaluate bacteria as active stabilizers for enhanced emulsion functionality.

Main Methods:

  • Utilized dynamic microfluidic droplet-stability tests.
  • Assessed bacterial stabilization of droplets against coalescence across various species and concentrations.
Keywords:
Bacterial Pickering emulsionExtended DLVOMicrofluidics

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Last Updated: Jun 7, 2026

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  • Characterized zeta-potential and three-phase contact angle for input into an extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) model.

    • Main Results:

    • Observed two distinct emulsion stabilization patterns: increasing stability with cell concentration, and decreasing stability at higher concentrations for specific bacterial strains.
    • Proposed a mechanism where highly charged, less hydrophobic bacteria stabilize at low concentrations but promote coalescence at high concentrations via droplet bridging.
    • Demonstrated the significant role of bacterial appendages in interface breaching.

    Conclusions:

    • Bacterial surface properties, including charge, hydrophobicity, and appendages, critically influence Pickering emulsion stability.
    • A theoretical framework combining microfluidic tests and the XDLVO model can predict bacterial stabilization behavior.
    • This research provides a foundation for rationally designing bacterial stabilizers for Pickering emulsions.