Evaluation of the hydrophobic properties of latex microspheres and <em>Bacillus</em> spores. Influence of the particle size on the data obtained by the MATH method (microbial adhesion to hydrocarbons) - INRA - Institut national de la recherche agronomique Accéder directement au contenu
Article Dans Une Revue Colloids and Surfaces B: Biointerfaces Année : 2019

Evaluation of the hydrophobic properties of latex microspheres and Bacillus spores. Influence of the particle size on the data obtained by the MATH method (microbial adhesion to hydrocarbons)

Résumé

The current experimental study investigates the influence of latex microsphere particles' size on the assessment of their hydrophilic/hydrophobic character, using the method known as “Microbial Adhesion to Hydrocarbons” (MATH). Since bacteria surfaces often change according to the environment in which they find themselves, most of the experiments here were carried out using the calibrated latex microspheres Polybeads® and Yellow-green Fluoresbrite® (Polyscience) microspheres with diameters between 0.2 μm and 4.5 μm. All the beads had a density of ˜1.05 g/cm3. The first set of experiments was performed to adapt the procedure for measurements of water contact angles to microsphere lawns. It was found that all the microspheres tested were hydrophobic, when using a water contact angle of around 110-118°. However, wide differences were observed using the MATH method. The smaller microspheres (0.2 μm, 0.5 μm +/- 0.75 μm) exhibited a poor affinity to hexadecane, even after long contact times, suggesting a hydrophilic character. In contrast, larger microspheres quickly adhered to hexadecane, which is consistent with the values obtained for the water contact angles observed. These results suggest that, at least where hydrophobic particles are concerned, the MATH method is not suitable for the assessment of the hydrophobic character of particles with diameters of less than 1.0 μm. We lastly investigated whether the data obtained for Bacillus spores could also be affected by spore size. The hydrophobicity of spores of eight Bacillus strains was analysed by both MATH and contact angle. Some discrepancies were observed between both methods but could not be related their size (length or width).
Fichier principal
Vignette du fichier
S0927776519305326.pdf (1.23 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-02619163 , version 1 (25-10-2021)

Licence

Paternité - Pas d'utilisation commerciale

Identifiants

Citer

Christine Faille, Christelle Lemy, Audrey Allion-Maurer, Farzam Zoueshtiagh. Evaluation of the hydrophobic properties of latex microspheres and Bacillus spores. Influence of the particle size on the data obtained by the MATH method (microbial adhesion to hydrocarbons). Colloids and Surfaces B: Biointerfaces, 2019, 182, ⟨10.1016/j.colsurfb.2019.110398⟩. ⟨hal-02619163⟩
42 Consultations
64 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More