Journal List > J Bacteriol Virol > v.47(1) > 1034270

Lee, Park, Choi, Uh, Park, and Han: The Influence of Urinary Catheter Materials on Forming Biofilms of Microorganisms

Abstract

Biofilms are commonly associated with an increased risk of catheter-associated infection. To study the efficacy of materials designed to reduce biofilm formation, microbial biofilms on clinically used urinary catheter were examined. We performed 2, 3-bis (2-methyoxy-4-nitro-5-sulfo-phenyl)-2H-tetrazolium-5-carboxanilide (XTT) reduction assay to determine of biofilm formation ability and observed with scanning electron microscopy (SEM) to analyze biofilm architecture. Additionally, we calculated relative cell surface hydrophobicity (CSH) to measure hydrophobicity of microorganisms. On SEM, catheter surfaces made of latex or anti-infective (IC)-latex were rough but those of silicone, hydrogel-coated silicone (HCS), or silver-alloy-coated silicone (SCS) were relatively smoother. According to XTT reduction assay, biofilm formation was reduced on the surface of smooth silicone-based catheters compared to rough latex-based catheters. The greatest to lowest formation of microbial biofilm were as follows for these material types: silicone-elastomer-coated (SEC) latex > latex > silicone > IC-latex > HCS > SCS. Catheter materials can affect the microbial biofilm formations. First, rougher surfaces on the catheter made the microbial attachment easier and a greater amount of biofilm was formed. Second, when chemicals that inhibit growth and attachment of microorganisms on the inner and outer surfaces of the catheters were applied, the biofilm formation was inhibited. SCS was found to be the most effective in reducing the microbial biofilm formation. These results indicate that microbial biofilm formation may be closely related to the surface roughness and microbial CSH.

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Figure 1.
Scanning electron micrographs of the catheter surface. (A) Latex, (B) anti-infective latex (IC-Latex), (C) silicone-elastomer-coated latex (SEC), (D) 100% silicone, (E) hydrogel-coated silicone (HCS), (F) silver-alloy-coated silicone (SCS). (scale bar, 10 μm)
jbv-47-32f1.tif
Figure 2.
Scanning electron micrographs of biofilm formation by C. albicans on catheter discs. (A) Latex, (B) anti-infective latex (IC-Latex), (C) silicone-elastomer coated latex (SEC), (D) 100% silicone, (E) hydrogel-coated silicone (HCS), (F) silver-alloy-coated silicone (SCS). (scale bar, 10 μm)
jbv-47-32f2.tif
Figure 3.
Scanning electron micrographs of biofilm formation by E. coli on catheter discs. (A) Latex, (B) anti-infective latex (IC-Latex),(C) silicone-elastomer coated latex (SEC), (D) 100% silicone, (E) hydrogel-coated silicone (HCS), (F) silver-alloy-coated (SCS). (scale bar, 10 μm)
jbv-47-32f3.tif
Figure 4.
Scanning electron micrographs of biofilm formation by P. vulgaris on catheter discs. (A) Latex, (B) anti-infective latex (IC-Latex), (C) silicone-elastomer coated latex (SEC), (D) 100% silicone, (E) hydrogel-coated silicone (HCS), (F) silver-alloy-coated silicone (SCS). (scale bar, 10 μm)
jbv-47-32f4.tif
Figure 5.
Scanning electron micrographs of biofilm formation by S. aureus on catheter discs. (A) Latex, (B) anti-infective latex (IC-Latex), (C) silicone-elastomer coated latex (SEC), (D) 100% silicone, (E) hydrogel-coated silicone (HCS), (F) silver-alloy-coated silicone (SCS). (scale bar, 10 μm)
jbv-47-32f5.tif
Figure 6.
Scanning electron micrographs of biofilm formation by S. salivarius on catheter discs. (A) Latex, (B) anti-infective latex (IC-Latex), (C) silicone-elastomer coated latex (SEC), (D) 100% silicone, (E) hydrogel-coated silicone (HCS), (F) silver-alloy-coated silicone (SCS). (scale bar, 10 μm)
jbv-47-32f6.tif
Table 1.
Biofilm formation ability of microorganisms on different catheter materials and cell surface hydrophobicity of microorganisms
Species Catheter materials CSH (%)
Latex IC-Latex SEC Silicone HCS SCS
C. albicans 2.09±0.039a 1.39±0.055 2.913±0.180 2.105±0.020 1.3±0.139 0.83±0.02 58±1b
E. coli 0.462±0.067 0.35±0.03 0.617±0.085 0.416±0.014 0.221±0.023 0.163±0.051 86±0
P. vulgaris 0.59±0.162 0.387±0.094 0.612±0.005 0.486±0.08 0.379±0.02 0.235±0.053 76±0
S. aureus 0.783±0.155 0.647±0.057 0.858±0.013 0.699±0.080 0.579±0.049 0.390±0.081 99±3.7
S. salivarius 1.116±0.105 0.772±0.061 1.324±0.084 0.706±0.016 0.576±0.022 0.297±0.002 98±1.6

a Values represent absorbance using XTT reduction assay.

b Values represent percentage of CSH. Each value is the mean of three independent experiments carried out in triplicate. IC-latex, anti-infective latex; SEC, silicone-elastomer-coated latex; HCS, hydrogel-coated silicone; SCS, silver-alloy-coated silicone; CSH, cell surface hydrophobicity.

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