Mean hydrodynamic size and polydispersity index (PDI) were determined by dynamic light scattering (DLS) at an angle of 90° in previously diluted samples with ultrapure water (1:500, v/v) (NanoBrook 90Plus PALS, Brookhaven Instruments, Holtsville, NY, USA) [29 (link),45 (link)]. The same equipment was used to measure zeta potential of previously diluted samples (1:1000, 1 mM KCl) by electrophoretic mobility [29 (link),45 (link)].
The pH value was measured by potentiometry (NanoBrook 90Plus PALS, Brookhaven Instruments, USA). A previously calibrated (pH 4.0 and pH 7.0) electrode probe was placed directly in the samples.
All measurements were carried out in triplicate.
The pH value was measured by potentiometry (NanoBrook 90Plus PALS, Brookhaven Instruments, USA). A previously calibrated (pH 4.0 and pH 7.0) electrode probe was placed directly in the samples.
All measurements were carried out in triplicate.
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