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Staphylococcus epidermidis RP62A adhesion to chemically modified cellulose derivatives
A P Fonseca1, P L Granja, J A Nogueira
1INEB - Instituto de Engenharia Biomédica, Laboratório de Biomaterials, Rua do Campo Alegre, 823, 4150-180 Porto, Portugal. afonscca@ibmc.up.pt
Journal of Materials Science. Materials in Medicine
|September 7, 2004
Summary
Coagulase-negative Staphylococcus epidermidis adhesion to materials was reduced by modifying cellulose diacetate surfaces. Chemical treatments like deacetylation and phosphorylation effectively lowered bacterial attachment, suggesting improved biomaterial biocompatibility.
Area of Science:
- Biomaterials Science
- Microbiology
- Surface Chemistry
Background:
- Coagulase-negative Staphylococcus epidermidis (CoNS) is a common cause of biomaterial-associated infections.
- Bacterial adhesion to medical device surfaces is the initial step in biofilm formation.
- Understanding bacterial-material interactions is crucial for developing infection-resistant biomaterials.
Purpose of the Study:
- To investigate the in vitro adhesion of Staphylococcus epidermidis expressing capsular polysaccharide/adhesin (PS/A) to cellulose diacetate (CDA) and low-density polyethylene (LDPE).
- To evaluate the impact of CDA surface modifications (deacetylation and phosphorylation) on bacterial adhesion.
- To correlate surface properties, including surface free energy and hydrophobicity, with bacterial adhesion.
Main Methods:
- In vitro assessment of Staphylococcus epidermidis adhesion to CDA and LDPE.
- Quantification of attached bacteria using colony-forming units after sonication.
- Contact angle measurements to determine surface free energy and hydrophobicity of cells and materials.
Main Results:
- Bacterial adhesion to both CDA and LDPE was observed.
- Surface free energy and hydrophobicity calculations provided insights into cell-material interactions.
- Chemical modifications of CDA surfaces via deacetylation and phosphorylation significantly reduced bacterial adhesion.
Conclusions:
- Surface modification of cellulose diacetate by deacetylation and phosphorylation is an effective strategy to reduce Staphylococcus epidermidis adhesion.
- These findings suggest potential for developing improved biomaterials with enhanced resistance to bacterial colonization.
- Surface chemistry plays a critical role in mediating bacterial adhesion to biomaterials.