Impact of metallic ions on electrohydrodynamics of soft colloidal polysaccharides

Influence of Metallic Ions on the Aggregation of Soft Colloidal Polysaccharides

“…The photo (Figure 2 (B)) corresponding to one of that polymer/calcium mixtures shows a suspension completely transparent as reference solution (Figure 2 (A)). This result evidences weak interactions between Ca 2+ and CMD at supramolecular scale, already previously highlighted through the study at molecular level [49]. Unlike Ca 2+ , the situation is different for Cd 2+ for which the plots of turbidity for the three tested CMD concentrations show a large dependence on the M/P ratios.…”

“…The photography of the associated CMD solutions on Figure 2 (C, D and E) shows relatively high turbid solutions for these polysaccharide/cadmium mixtures, reflecting experimental data that are up to 500 times more higher than those of polysaccharides/calcium mixtures. Such behavior is characteristic of high interactions between CMD macromolecules and cadmium, previously [49] seen at molecular state. The shift of the plots toward low metal/polymer ratios as CMD concentration increase may be due to a solvent effect.…”

“…The shift of the plots toward low metal/polymer ratios as CMD concentration increase may be due to a solvent effect. It is probable that with the increase of polysaccharide concentration, the polymer-polymer interactions induce a chain reconformation which favors intermolecular interactions arising from the bridge between carboxylate and cadmium ions [49]. In this way, these intermolecular interactions can lead to complexes formation that increase with large metal/polymer ratios.…”

“…It corresponds to an area below which no aggregation can be detected. Such a feature may be mainly attributed to intramolecular interactions occurring between cadmium and carboxylate ions [49,50]. Harnsilawat and al.…”

Effects of pH and temperature on colloidal properties and molecular characteristics of Konjac glucomannan

“…Dynamics light scattering (DLS) measurement was performed to attain the hydrodynamic radius (Rh) and to estimate molar mass (Mw-R) with a DynaPro NanoStar instrument (Wyatt, USA) (Sagou, Rotureau, Thomas, & Duval, 2013), Before loading, the KGM sample solution in water was filtered through a Millex-HN nylon clarification kit with a pore size of 0.2 m (Fisher Scientific). The temperature was varied from 25 • C to 80 • C at 0.5 • C/min ramp rate.…”