Table 3 Impact of physico-chemical disinfectant-exposure on catalase activity in S. epidermidis cells.

From: Alternative sigma factor B (σB) and catalase enzyme contribute to Staphylococcus epidermidis biofilm’s tolerance against physico-chemical disinfection

Type of cell

Mean ± SEM of height of O2-forming foam in response to physico-chemical disinfectant exposure

Heat

NaCl

NaOCl

H2O2

Biofilm (n = 62)

Unexposed

0.2258 ± 0.0052

0.2226 ± 0.0064

0.2242 ± 0.0053

0.2226 ± 0.0064

Exposed

0.4479 ± 0.0071

0.3640 ± 0.0059

0.3672 ± 0.0068

0.3151 ± 0.0067

 

p < 0.0001

p < 0.0001

p < 0.0001

p < 0.0001

Planktonic (n = 62)

Unexposed

0.2505 ± 0.0056

0.2516 ± 0.0057

0.2511 ± 0.0057

0.2522 ± 0.0061

Exposed

0.4129 ± 0.0068

0.3602 ± 0.0058

0.3651 ± 0.0067

0.3258 ± 0.0070

 

p < 0.0001

p < 0.0001

p < 0.0001

p < 0.0001

  1. The height of O2-forming foam of S. epidermidis biofilm and planktonic cells exposed to 50 °C, 0.8 M NaCl, 5 mM NaOCl or 50 μM H2O2 for 60 minutes and the unexposed controls. Statistical differences between physico-chemical disinfectant-exposed cells and the unexposed controls were determined using paired t-test (all the differences were significant; p < 0.05).
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