Abstract
Phytoglycogen nanoparticles are highly branched polymers of anhydroglucose units (AGUs) produced as soft, compact nanoparticles by sweet corn. By combining results of dialysis, ellipsometry and gravimetric analysis experiments, we constructed a master plot of the osmotic pressure Π -concentration C data for phytoglycogen nanoparticles that spans the complete range ∼ 0% w/w <C< ∼ 100 % w/w. The distinctive shape of the ΠC curve for phytoglycogen differs significantly from that of dextran, a lightly branched polysaccharide also made up of AGUs but not in the form of particles, especially near concentrations corresponding to contact between the nanoparticles. By calculating the dependence of the osmotic pressure on the volume per particle, we determined the increase in the bulk modulus of the particles with decreasing particle volume due to removal of water from the particles upon compression. This approach allowed us to quantify the strong correlation between the mechanical and hydration properties of phytoglycogen nanoparticles.
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