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Title: Structure and Hydration of Highly-Branched, Monodisperse Phytoglycogen Nanoparticles

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. For this paper, 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. Finally, the present approach can be generalized to other systems containing nanoconfined water.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2] ;  [2] ;  [5] ;  [6] ;  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Inst. for Neutron Sciences; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division
  2. Univ. of Guelph, ON (Canada). Dept. of Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Inst. for Neutron Sciences; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Biology and Soft Matter Division
Publication Date:
OSTI Identifier:
1261307
Grant/Contract Number:
AC05-00OR22725; FG02-08ER46528
Type:
Accepted Manuscript
Journal Name:
Biomacromolecules
Additional Journal Information:
Journal Volume: 17; Journal Issue: 3; Journal ID: ISSN 1525-7797
Publisher:
American Chemical Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Ontario Ministry of Agriculture (OMAF) (Canada); Natural Sciences and Engineering Research Council (NSERC) of Canada
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY polysaccharide; colloid; hydration water; dynamics; neutron scattering; SANS