Background: Microorganisms can migrate from the external environment
to the patient’s organism through the insertion of catheters. Despite being
indispensable medical device, the catheter surface can be colonized by microorganisms
and become a starting point for biofilm formation. Therefore, new technologies
are being developed in order to modify surfaces to prevent the adhesion
and survival of microorganisms. Patents with the use of DMPEI have been filed.
Objective: In the present work, we coated latex catheter surfaces with 2 mg mL-1
DMPEI in different solvents, evaluated the wettability of the surface and the anti-
biofilm activity of the coated catheter against Escherichia coli, Staphylococcus
aureus, and Candida albicans.
Methods: We coated the inner and outer catheter surfaces with 2 mg mL-1 of DMPEI
solubilized in butanol, dimethylformamide, and cyclohexanone and the surfaces
were analyzed visually. Contact angle measurement allowed the analysis of
the wettability of the surfaces. The CFU mL-1 count evaluated E. coli, S. aureus,
and C. albicans adhesion onto the control and treated surfaces.
Results: The contact angle decreased from 50.48º to 46.93º on the inner surface
and from 55.83º to 50.91º on the outer surface of latex catheters coated with DMPEI.
The catheter coated with DMPEI showed anti-biofilm activity of 83%, 88%,
and 93% on the inner surface and 100%, 92%, and 86% on the outer surface for
E. coli, S. aureus, and C. albicans, respectively.
Conclusion: Latex catheter coated with DMPEI efficiently impaired the biofilm
formation both on the outer and inner surfaces, showing a potential antimicrobial
activity along with a high anti-biofilm activity for medical devices.