Lysine and α-Aminoisobutyric Acid Conjugated Bioinspired Polydopamine Surfaces for the Enhanced Antibacterial Performance of the Foley Catheter.

Microbial adhesion onto implanted devices was reduced by the immobilization of amino acid lysine and α-aminoisobutyric acid to polydopamine functionalized PET films and Foley catheters. The polydopamine functionalized film was prepared by a dip coating method followed by incorporation of biocompatible amino acids to prepared films. The purpose of development of the modified pDA film is to improve the anti-biofouling and antibacterial activity of the film which can be successfully applied for medical devices. The characterization of modification was done using different techniques such as contact angle measurement, ATR-FTIR, FE-SEM, AFM, and XPS analysis. ATR-FTIR spectroscopy and XPS confirmed the successful amino modification of film. The anti-biofouling and antimicrobial behavior of the prepared surfaces were evaluated using the bacterial attachment and death assay. The resulting coatings repelled bacterial cell attachment and killed clinically applicable Gram-negative and Gram-positive strains. The developed coatings were applied to the Foley catheters to study the antibacterial activity by the log reduction method. The results demonstrate that tested amino acid-modified film increases the antibacterial activity of the catheters and can significantly help in reduction of nosocomial infections.