Antibacterial activity of microstructured Ag/Au sacrificial anode thin films

Ten different Ag dot arrays (16 to 625 microstructured dots per square mm) were fabricated on a continuous Au thin film and for comparison also on Ti film by sputter deposition and photolithographic patterning. To analyze the antibacterial activity of these microstructured films Escherichia coli and...

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Bibliographic Details
Published in:Materials Science & Engineering C 2015-01, Vol.46, p.276-280
Main Authors: Köller, Manfred, Sengstock, Christina, Motemani, Yahya, Khare, Chinmay, Buenconsejo, Pio J.S., Geukes, Jonathan, Schildhauer, Thomas A., Ludwig, Alfred
Format: Article
Language:English
Subjects:
Anti-Bacterial Agents - chemistry
Anti-Bacterial Agents - pharmacology
Antibacterial surface
Antiinfectives and antibacterials
Arrays
Bacteria
Cells, Cultured
Electrodes
Escherichia coli
Gold
Gold - chemistry
Gold - pharmacology
Humans
Sacrificial anode
Silver
Silver - chemistry
Silver - pharmacology
Staphylococcus aureus
Strain
Surface chemistry
Thin film
Thin films
Titanium
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Summary:Ten different Ag dot arrays (16 to 625 microstructured dots per square mm) were fabricated on a continuous Au thin film and for comparison also on Ti film by sputter deposition and photolithographic patterning. To analyze the antibacterial activity of these microstructured films Escherichia coli and Staphylococcus aureus were placed onto the array surfaces and cultivated overnight. To analyze the viability of planktonic as well as surface adherent bacteria, the applied bacterial fluid was subsequently aspirated, plated on blood agar plates and adherent bacteria were detected by fluorescence microscopy. A particular antibacterial effect towards both bacterial strains was induced by Ag dot arrays on fabricated Au thin film (sacrificial anode system for Ag), due to the release of Ag ions from dissolution of Ag dots in contrast to Ag dot arrays fabricated on the Ti thin films (non-sacrificial anode system for Ag) which remained intact to the original dot shape. The required number of Ag dots on gold film to achieve complete bactericidal effects for both bacterial strains was seven times lower than that observed with Ag dot arrays on Ti film. •Ag dot arrays were fabricated on Au or Ti thin films by sputter deposition.•Antibacterial activity of both array types was tested towards E. coli and S. aureus.•Ag on Au samples induced higher antibacterial effects compared to Ag on Ti samples.•We established a sacrificial anode system for Ag which led to enhanced Ag ion release.
ISSN:0928-4931
1873-0191
DOI:10.1016/j.msec.2014.10.058