A novel analytical ultracentrifugation based approach to the low resolution structure of gum arabic

Gillis, Richard B.; Adams, Gary G.; Alzahrani, Qushmua; Harding, Stephen E.

doi:10.1002/bip.22823

Cited by 3 publications

(2 citation statements)

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“…The conformation varies from spheres to oblate ellipsoids for A. seyal molecules, while it varies from oblate ellipsoids to more anisotropic conformations, such as oblate and prolate ellipsoids, for A. senegal molecules (Lopez-Torrez, et al, 2015). The ellipsoidal conformation of A. senegal molecules is also confirmed using hydrodynamic technics as sedimentation velocity analytical ultracentrifugation and size exclusion chromatography coupled to multi-angle light scattering (SEC MALS) and differential viscometry (Gillis, Adams, Alzahrani, & Harding, 2016).…”

Section: Version Postprintmentioning

confidence: 83%

Acacia gum: History of the future

et al. 2018

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On behalf of the 90th birthday of Professor Glyn O. Phillips, it is a great honor for authors of this publication to make a review on Acacia gum, one of the favorite polysaccharides extensively studied by Glyn and his collaborators all around the world during these last five decades. After remembering a synthetic historical perspective, the present critical review summarizes the main updated data of this complex polysaccharide from the chemical composition to the functional properties with a particular attention toward structure and bulk and interfacial properties. Biological properties of Acacia gums were not considered. Some of the main challenges in a near future for a better understanding of the functional properties of this polysaccharide concerns the detailed study of the gum maturation mechanism upon exudation, the structure and conformation of different molecular fractions, the role of minor components (minerals, polyphenols, lipids) on the structure and functionality of gums, the physicochemical properties of purified molecular fractions and the ways to modified them upon enzymatic modifications. In our opinion, the main challenges for a better understanding of the interfacial function of this polysaccharide (adhesion and stabilization at liquid and solid interfaces) will be to probe the interfacial induced conformational changes. This area of research seems to have been quite neglected during these last past years and fundamental questions arising from the adhesive and stabilizing properties of Acacia gum are still without answer today.In addition, the amino-acid sequence contained in this complex polysaccharide are totally unknown today and future developments based on enzyme/chemical modifications and liquid chromatography coupled to on line mass spectrometry could unravel the sequence and decipher between the existence of one or more amino-acid sequences in Acacia senegal gum.We sincerely hope Glyn, one of the “father of Arabic gum”, will find some positive echo in this review

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Section: Version Postprintmentioning

confidence: 83%

Acacia gum: History of the future

et al. 2018

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“…The Wattle blossom model of gum arabic [59] indicates that it consists of arabinogalactan (GA), arabinogalactan protein (AGP), and glycoprotein (GP) ( Figure 11(a)), this means GA has a hydrophilic and hydrophobic species. The pH value of the native gum arabic solution was 4.58, and its isoelectric point was 1.8.…”

Section: Discussionmentioning

confidence: 99%

Formation and Stabilization of Vaterite Calcium Carbonate by Using Natural Polysaccharide

Saraya¹,

Rokbaa²

2017

ANP

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This paper aimed to study the effects of natural polysaccharide (gum arabic, GA) on the formation of vaterite calcium carbonate and its stability in aqueous solution. Gum arabic is a macromolecule that has a high molecular weight and is amphoteric in character. A 0, 2.5, 5 or 10 ml of GA solution (30%) was added to the calcium chloride solution with various initial concentrations to prepare the vaterite calcium carbonate. The calcium carbonate particles were characterized using FTIR, XRD, SEM, TEM and DSC-TG as well as calculation of phase contents. The results of XRD and FTIR analysis were showing that the presence of GA during the precipitation changes the behavior of calcium carbonate to form vaterite until at lower dose used. In addition, the molar content of vaterite increased at the expense of content of calcite with increasing the GA dose. There are slightly improvements in the vaterite content by increasing the initial concentration. The formed vaterite calcium carbonates composed of aggregates as broccoli-like or spherical shape and with particle size 1.6 -2.5 µm in diameter. TEM images showed that these aggregates composed of the sub spherical unit with diameter 15 -30 nm. The thermal behavior of prepared vaterite was conformed the mineral composition of these phases. The prepared calcium carbonate, which is formed in the presence of different doses of gum, has a stability in the aqueous solutions at different temperatures, as the analyzes indicated that a very small percentage of the vaterite were converted to calcite. The gum arabic prevented or depressed the transformation of vaterite to calcite through capped the surface of particles, i.e. it is more effective in stabilizing the vaterite phase with increasing in initial concentration and time.

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