Morris, Gordon, Castile, J., Smith, A., Adams, G. G. and Harding, S. E. (2009) Macromolecular conformation of chitosan in dilute solution: A new global hydrodynamic approach. Carbohydrate Polymers, 76 (4). pp. 616-621. ISSN 0144-8617

This is the latest version of this item.

Abstract

Chitosans of different molar masses were prepared by storing freshly prepared samples for up to 6 months at either 4, 25 or 40 °C. The weight-average molar masses, Mw and intrinsic viscosities, [η] were then measured using size exclusion chromatography coupled to multi-angle laser light scattering (SEC-MALLS) and a "rolling ball" viscometer, respectively. The solution conformation of chitosan was then estimated from:(a)the Mark-Houwink-Kuhn-Sakurada (MHKS) power law relationship [η] = kMwa and(b)the persistence length, Lp calculated from a new approach based on equivalent radii [Ortega, A., & Garcia de la Torre, J. (2007). Equivalent radii and ratios of radii from solution properties as indicators of macromolecular conformation, shape, and flexibility. Biomacromolecules, 8, 2464-2475]. Both the MHKS power law exponent (a = 0.95 ± 0.01) and the persistence length (Lp = 16 ± 2 nm) are consistent with a semi-flexible rod type (or stiff coil) conformation for all 33 chitosans studied. A semi-flexible rod conformation was further supported by the Wales-van Holde ratio, the translational frictional ratio and sedimentation conformation zoning. © 2008 Elsevier Ltd. All rights reserved.

Information
Library
Documents
[img]
Preview
Macromolecular_conformation_of_chitosan_in_dilute_solution_(accepted).pdf - Accepted Version

Download (632kB) | Preview
Statistics

Downloads

Downloads per month over past year

Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email