Abstract
The antibacterial activity for pathogenic and food-poisoning bacteria and affinity for biomaterial adsorption of electroless Ni-P-PTFE plated composite coating on stainless steel were studied. The antibacterial abilities of electrolytic Ni plated and electroless Ni-P plated coatings on stainless steel for Escherichia coli increased with decreasing their spontaneous electrode potentials, suggesting that the amount of Ni2+ dissolved from the plated coatings was correlated with the magnitude of antibacterial ability. Growth of pathogenic and food-poisoning bacteria, i. e., Escherichia spp. (coli and O157), Staphylococcus spp. (aureus and MRSA), Salmonella spp., Klebsialla spp., and Pseudomonas spp., was inhibited completely after being in contact with electroless Ni-P-PTFE plated coating for 24 h. The Ni-P and Ni-P-PTFE plated coatings showed high affinities for E. coli adhesion and bovine serum albumin (BSA) adsorption compared with those of stainless steel. Kinetic analysis of cleaning curves of BSA-fouled Ni-P and Ni-P-PTFE plated coatings showed that the first-order desorption rate constants for Ni-P and Ni-P-PTFE plated coatings were lower by one order of magnitude than those for stainless steel. These results indicated that Ni-P-PTFE plated coating had a significantly high antibacterial ability, whereas its surface was more susceptible to biofouling than stainless steel.
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