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Table 2 Zeta potential (mV) and mean fluorescence intensity of normal, heat treated and autoclaved E. coli and S. aureus

From: Alteration of Zeta potential and membrane permeability in bacteria: a study with cationic agents

Treatment Zeta potential (mV) Fluorescence intensity (NPN uptake)
E. coli S. aureus E. coli S. aureus
Normal bacterial cell −44.2 ± 0.50 −35.6 ± 0.54 975 ± 55.49 855 ± 60.83
Heat treatment for 10 min at 100 °C −33.9 ± 0.81** −35.13 ± 0.60 1248 ± 138.82** 872 ± 62.96
Heat treatment for 30 min at 100 °C −21.1 ± 0.62** −27.6 ± 0.54** 1543 ± 76.01** 1209 ± 70.34**
  1. Values are expressed as mean ± SEM; (n = 6)
  2. The respective values of Zeta potential and NPN assay of normal, heat treated and autoclaved E. coli and S. aureus
  3. The data are the means ± the standard deviations (n = 6)
  4. ** p < 0.01. (vs. control)