Zeta potential of oral bacteria (Streptococci)

This study was carried out to examine whether oral bacteria can be treated electrochemically in the same manner as colloid particles. The zeta potentials for 13 Streptococcus strains incubated in trypticase soy broth (TSBY) and heart infusion broth (HIB) were determined in 1/30 M phosphate buffer solution of pH 7.0 by standard microelectrophoresis. The zeta potentials for the Streptococci showed a wide range of values from -28.7 mV to -2.1 mV in TSBY and from -28.5 mV +2.0 mV in HIB. The zeta potential was useful in determining the potential structure of the bacterial cell as living colloid, especially Streptococcus.