Fig. 5. Dependence of the electrophoretic mobility of polysaccharides on NaNO₃ electrolyte concentration.

Points: experimental data. Dashed lines: theory (Eq. 1). A Polysaccharides whose electrophoretic mobility significantly depends on solution ionic strength (fixed by NaNO₃ electrolyte concentration). B Bacterial polysaccharides whose electrokinetic features poorly to moderately depend on electrolyte concentration. Polysaccharides with names in red display a broad-spectrum antibiofilm activity. PnPS12F and PnPS18C display a narrow spectrum antibiofilm activity (Table S1) Each experiment corresponding to n = 3 biologically independent experiments. Error bars represent SD. In panel B the blue zone delimited by blue dotted lines brackets the quasi-electrolyte concentration-independent electrophoretic mobility values measured for the polysaccharides with narrow-spectrum activity. The red zone delimited by red dotted lines brackets the quasi-electrolyte concentration-independent electrophoretic mobility values measured for the polysaccharides with broad spectrum activity. Each data point corresponds to n = 3 biologically independent experiments. Source data are provided as a Source Data file. Error bars represent SD. If not visible, error bars are hidden within their corresponding data point.