Figure 6. Effect of temperature, pH and inorganic salts on the viscosity of crude EPS solution.

Viscosity was measured by a Brookfield viscometer with the small sample adapter and the spindle S16. A, the effect of temperature on the EPS solution of different concentrations (0.2%, 0.4%, 0.6%, 0.8%, 1.0%, and 1.2% (w/v)); B, the effect of different pH (1–14) on 1% (w/v) EPS solution (25°C); C, the effect of different concentration of NaCl and CaCl₂ (0–10%) on 1% (w/v) EPS solution (25°C). The graph shows data from triplicate experiments (mean ± S.D.).