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

Journal Article · · Biomacromolecules
 [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

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Ontario Ministry of Agriculture (OMAF) (Canada); Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
AC05-00OR22725; FG02-08ER46528
OSTI ID:
1261307
Journal Information:
Biomacromolecules, Vol. 17, Issue 3; ISSN 1525-7797
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 56 works
Citation information provided by
Web of Science

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Cited By (10)

Unusual polysaccharide rheology of aqueous dispersions of soft phytoglycogen nanoparticles journal January 2018
The cold neutron chopper spectrometer at the Spallation Neutron Source—A review of the first 8 years of operation journal September 2016
Enhancing innate antiviral immune responses in rainbow trout by double stranded RNA delivered with cationic phytoglycogen nanoparticles journal September 2019
Glycogen as a Building Block for Advanced Biological Materials journal October 2019
Controlling silicone-saccharide interfaces: greening silicones journal January 2017
Flow properties reveal the particle-to-polymer transition of ultra-low crosslinked microgels journal January 2020
Polymers on nanoparticles: structure & dynamics journal January 2019
Translocation of soft phytoglycogen nanoparticles through solid-state nanochannels journal January 2019
Flexibility and Hydration of Amphiphilic Hyperbranched Arabinogalactan-Protein from Plant Exudate: A Volumetric Perspective journal March 2018
A novel method for constructing continuous intrinsic surfaces of nanoparticles journal July 2017

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