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Table 1 Effectiveness of physico-chemical stress exposure durations on S. epidermidis biofilm and planktonic cells

From: Susceptibility patterns and the role of extracellular DNA in Staphylococcus epidermidis biofilm resistance to physico-chemical stress exposure

Type of culture

Mean ± SEM of log reduction of CFU/mL of cells exposed to commonly recommended stresses

Heat

NaCl

NaOCl

H2O2

Biofilm

 30 min

0.110 ± 0.006

0.281 ± 0.011

0.089 ± 0.005

0.219 ± 0.011

 60 min

0.332 ± 0.009

0.464 ± 0.014

0.266 ± 0.007

0.494 ± 0.018

 

p < 0.05

p < 0.05

p < 0.05

p < 0.05

Planktonic

 30 min

0.342 ± 0.007

0.574 ± 0.013

0.199 ± 0.007

0.673 ± 0.013

 60 min

0.596 ± 0.010

0.744 ± 0.015

0.404 ± 0.007

1.067 ± 0.013

 

p < 0.05

p < 0.05

p < 0.05

p < 0.05

  1. S. epidermidis biofilm and planktonic cultures were exposed to 60 °C, 1.72 M NaCl, a solution containing 150 μL of waterguard in 1 L of water and 1.77 M H2O2 for 30 and 60 min. Statistical significance between 30 and 60 min physico-chemical stress exposure durations on S. epidermidis biofilm or planktonic cultures was determined by paired t-test