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The MATH test. A three-phase assay?

Jesús A Salas-Tovar1, Sarai Escobedo-García1, Guadalupe I Olivas1

  • 1Centro de Investigación en Alimentación y Desarrollo, Ave. Río Conchos S/N, Parque Industrial, Cd. Cuauhtémoc, Chihuahua 31570, Mexico.

FEMS Microbiology Letters
|June 12, 2024
PubMed
Summary
This summary is machine-generated.

Glass test tubes can interfere with bacterial adhesion to hydrocarbons measurements using the MATH test. This interference, particularly with Gram-positive bacteria, can lead to inaccurate cell surface hydrophobicity values.

Keywords:
bacterial adhesion to glassbacterial adhesion to hydrocarbonbacterial surface hydrophobicitymicrobial surface characterization

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Area of Science:

  • Microbiology
  • Biophysics
  • Analytical Chemistry

Background:

  • The Microbial Adhesion To Hydrocarbons (MATH) test is a common method for assessing bacterial cell surface hydrophobicity.
  • Accurate quantification of bacterial adhesion is crucial for understanding microbial interactions and surface properties.
  • Potential interference from experimental materials, such as glassware, can affect the reliability of adhesion assays.

Purpose of the Study:

  • To investigate the interference of glass test tubes in the quantification of bacterial adhesion to hydrocarbons using the MATH test.
  • To evaluate the influence of different suspending polar phases and ionic strengths on bacterial adhesion to both hydrocarbons and glass.

Main Methods:

  • Assessed the adhesion of four bacterial strains to hexadecane and glass test tubes.
  • Utilized various suspending polar phases and manipulated ionic strength to study adhesion patterns.
  • Correlated bacterial adhesion to glassware with their electron-donor properties.

Main Results:

  • Gram-positive bacteria adhered to both hexadecane and glass test tubes irrespective of the polar phase.
  • Escherichia coli ATCC 25922 showed minimal adhesion to either hexadecane or glass.
  • Bacterial adhesion to glass was linked to electron-donor properties and influenced by ionic strength, affecting electrostatic repulsion.

Conclusions:

  • Glass test tubes can interfere with the MATH test by interacting with bacterial cells, particularly Gram-positive strains.
  • This interaction can lead to overestimation of bacterial adhesion to hydrocarbons, resulting in erroneous cell surface hydrophobicity measurements.
  • Careful consideration of experimental conditions, including ionic strength and bacterial properties, is necessary for accurate MATH test interpretation.