Polysaccharides zeta potential

Table 7.2 Effect of the presence of an anionic polysaccharide on the measured zeta potential (Q of emulsion droplets stabilized by proteins under experimental conditions corresponding to protein-polysaccharide complexation. In all cases the complexes were formed in the bulk aqueous medium before emulsification.

Figure 7.20 Influence of salt content on properties of bilayer emulsions based on p-lactoglobulin + i-carrageenan at pH = 6.0 (a) zeta potential and (b) mean particle diameter The primary emulsion (open symbols) contained 5 wt% oil and 0.5 wt% protein die secondary emulsions (ftlled symbols) contained an additional 0.1 wt% polysaccharide. Reproduced from Gu el al. (2005b) with permission.

One phase contains the polysaccharide chitosan (CS) and a diblock copolymer of ethylene oxide and the polyanion sodium tripolyphosphate (TPP). It was stated that the size (200-1000 nm) and zeta potential (between + 20 mV and + 60 mV) of nanoparticles can be conventionally modulated by varying the ratio of CS/PEO to PPO. Furthermore, using BSA as a model protein, it was shown that these new nanoparticles have a high protein loading capacity (entrapment efficiency up to 80 % of the protein) and provide a continuous release of the entrapped protein for up to 1 week [56]. 

---