Publication: Solution rheology of mesquite gum in comparison with gum arabic
Authors
Morris, E. R. ; Richardson, R.K. ; Bell, A.E. ; Goycoolea Valencia, Francisco Martín
item.page.secondaryauthor
item.page.director
Publisher
Elsevier
publication.page.editor
publication.page.department
DOI
https://doi.org/10.1016/0144-8617(95)00031-2
item.page.type
info:eu-repo/semantics/article
Description
©1995. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Accepted, version of a Published Work that appeared in final form in Carbohydrate Polymers. To access the final edited and published work see https://doi.org/10.1016/0144-8617(95)00031-2
Abstract
Commercial samples of mesquite gum and food-grade gum arabic were purified by filtration, alcohol precipitation, and extensive dialysis, and their rheological properties were characterised over the full range of concentrations at which solutions could be prepared (up to ~50% w/w). Both gave typical solution-like mechanical spectra, with close Cox-Merz superposition of 71(-y) and 71*(w) and only slight shear thinning at the highest accessible concentrations, and (In 71rei)/c varied linearly with log c from below 2% w/w to above 50%. The intrinsic viscosity of mesquite gum q11] � 0· 11 di g-1 ) was appreciably lower than that of gum arabic ([71] � 0-19 dig- in 0-1 M NaCl at 20°C), and was independent of ionic strength above I� 0-05, indicating a compact structure capable of only limited contraction. Departures from dilute-solution behaviour (71 ~ c1 • 4) occurred at c [71] � I for both materials, with a progressive increase in concentration dependence at higher space-occupancy, behaviour typical of soft, deformable particles, rather than of interpenetrating macromolecules. The increase in viscosity with increasing concentration was steeper for mesquite, consistent with evidence from size-exclusion chromatography and dynamic light scattering that the larger (and presumably more deformable) 'wattle blossom' component of gum arabic was absent from the mesquite gum sample.
publication.page.subject
Citation
Carbohydrate Polymers, 27, 1995: 37-45
item.page.embargo
Collections
Ir a Estadísticas
Este ítem está sujeto a una licencia Creative Commons. http://creativecommons.org/licenses/by-nd/4.0/