Solution rheology of mesquite gum in comparison with gum arabic

Morris, E. R.; Richardson, R.K.; Bell, A.E.; Goycoolea Valencia,  Francisco Martín

Publication:
Solution rheology of mesquite gum in comparison with gum arabic

dc.contributor.author	Morris, E. R.
dc.contributor.author	Richardson, R.K.
dc.contributor.author	Bell, A.E.
dc.contributor.author	Goycoolea Valencia, Francisco Martín
dc.contributor.department	Biología Celular e Histología
dc.date.accessioned	2024-02-09T12:04:37Z
dc.date.available	2024-02-09T12:04:37Z
dc.date.issued	1995
dc.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
dc.description.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.
dc.format	application/pdf	es
dc.format.extent	9	es
dc.identifier.citation	Carbohydrate Polymers, 27, 1995: 37-45
dc.identifier.doi	https://doi.org/10.1016/0144-8617(95)00031-2
dc.identifier.issn	Print: 0144-8617
dc.identifier.issn	Electronic: 1879-1344
dc.identifier.uri	http://hdl.handle.net/10201/139124
dc.language	eng	es
dc.publisher	Elsevier
dc.relation	thank The British Council and CONACYT (Mexico) for studentship support to F.M.G.	es
dc.rights	info:eu-repo/semantics/openAccess	es
dc.rights	Attribution-NoDerivatives 4.0 Internacional	*
dc.rights.uri	http://creativecommons.org/licenses/by-nd/4.0/	*
dc.title	Solution rheology of mesquite gum in comparison with gum arabic	es
dc.type	info:eu-repo/semantics/article	es
dspace.entity.type	Publication	es
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