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    Influence of casein on the degradation process of polylactide-casein coatings for resorbable alloys
    (Nature Portfolio, 2024) Cesarz-Andraczke, Katarzyna; Staszuk, Marcin; Tuncay, Tansel; Wozniak, Anna; Smok, Weronika; Tuncay, Badegul
    This study used the dip-coating method to develop a new biocompatible coating composed of polylactide (PLA) and casein for ZnMg1.2 wt% alloy implants. It evaluated its impact on the alloy's degradation in a simulated body fluid. After 168 h of immersion in Ringer's solution, surface morphology analysis showed that the PLA-casein coatings demonstrated uniform degradation, with the corrosion current density measured at 48 mu A/cm2. Contact angle measurements indicated that the average contact angles for the PLA-casein-coated samples were below 80 degrees, signifying a hydrophilic nature that promotes cell adhesion. Fourier-transform infrared spectroscopy (FTIR) revealed no presence of lactic acid on PLA-casein coatings after immersion, in contrast to pure PLA coatings. Pull-off adhesion tests showed tensile strength values of 7.6 MPa for pure PLA coatings and 5 MPa for PLA-casein coatings. Electrochemical tests further supported the favorable corrosion resistance of the PLA-casein coatings, highlighting their potential to reduce tissue inflammation and improve the biocompatibility of ZnMg1.2 wt% alloy implants.