Structure and Hydration of Highly-Branched, Monodisperse Phytoglycogen Nanoparticles
Autor: | Georg Ehlers, John Atkinson, Jonathan D. Nickels, John Dutcher, Perry Mahon, John Katsaras, Stefania Perticaroli, Erzsebet Papp-Szabo, Christopher B. Stanley, Souleymane Diallo, Benjamin Baylis |
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Rok vydání: | 2016 |
Předmět: |
Polymers and Plastics
Dispersity Nanoparticle Bioengineering 02 engineering and technology Neutron scattering 010402 general chemistry 01 natural sciences Zea mays Biomaterials chemistry.chemical_compound Colloid Materials Chemistry Colloids Phytoglycogen 021001 nanoscience & nanotechnology Small-angle neutron scattering 0104 chemical sciences Crystallography Monomer Glucose chemistry Chemical engineering Quasielastic neutron scattering Nanoparticles 0210 nano-technology Hydrophobic and Hydrophilic Interactions Glycogen |
Zdroj: | Biomacromolecules. 17(3) |
ISSN: | 1526-4602 |
Popis: | Phytoglycogen is a naturally occurring polysaccharide nanoparticle made up of extensively branched glucose monomers. It has a number of unusual and advantageous properties, such as high water retention, low viscosity, and high stability in water, which make this biomaterial a promising candidate for a wide variety of applications. In this study, we have characterized the structure and hydration of aqueous dispersions of phytoglycogen nanoparticles using neutron scattering. Small angle neutron scattering results suggest that the phytoglycogen nanoparticles behave similar to hard sphere colloids and are hydrated by a large number of water molecules (each nanoparticle contains between 250% and 285% of its mass in water). This suggests that phytoglycogen is an ideal sample in which to study the dynamics of hydration water. To this end, we used quasielastic neutron scattering (QENS) to provide an independent and consistent measure of the hydration number, and to estimate the retardation factor (or degree of water slow-down) for hydration water translational motions. These data demonstrate a length-scale dependence in the measured retardation factors that clarifies the origin of discrepancies between retardation factor values reported for hydration water using different experimental techniques. The present approach can be generalized to other systems containing nanoconfined water. |
Databáze: | OpenAIRE |
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