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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)