Bubble contact angle method for evaluating substratum interfacial characteristics and its relevance to bacterial...

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Microbiology

Background:

• Understanding surface properties is crucial for controlling bacterial adhesion.
• Polystyrene substrata are widely used in biological applications, but their surface characteristics can be modified by proteins and other macromolecules.
• The interaction of bacteria with surfaces is a complex process influenced by both the substratum and the conditioning medium.

Purpose of the Study:

• To investigate the interfacial free-energy characteristics of polystyrene substrata.
• To determine how surface conditioning with proteins and bacterial products affects these characteristics.
• To correlate surface property changes with the attachment of Pseudomonas sp. strain NCMB 2021.

Main Methods:

• Bubble contact angle measurements were used to assess interfacial free energy.
• Polystyrene substrata (petri dishes and tissue culture dishes) were conditioned with various proteins and bacterial products.
• Bacterial attachment assays were performed to quantify adhesion.
• Enzymatic modification (pronase) was used to probe protein conditioning effects.

Main Results:

• Tissue culture dishes were more hydrophilic than clean petri dishes.
• Surface conditioning with proteins and bacterial products altered bubble contact angles.
• Changes in contact angles generally correlated with bacterial attachment, with some exceptions.
• Pronase treatment modified protein conditioning effects in a substratum- and protein-dependent manner.

Conclusions:

• Interfacial free energy, as measured by contact angles, is a key factor in bacterial adhesion to polystyrene substrata.
• Surface conditioning significantly alters these properties, influencing bacterial attachment.
• Different substrata (petri dish vs. tissue culture dish) may involve distinct bacterial adhesion mechanisms.