Rheological properties of gum arabic solution: From Newtonianism to thixotropy

Li, Xiaobei; Fang, Yapeng; Zhang, Hongbin; Nishinari, Katsuyoshi; Al-Assaf, Saphwan; Phillips, Glyn O.

doi:10.1016/j.foodhyd.2010.06.006

Cited by 56 publications

(25 citation statements)

References 29 publications

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“…At present, the literature consensus (Sanchez et al, 2018) has been to integrate these two-dimensional units into a wattle blossom model, using also the palindromic sequence for polypeptide chains, thus assuming their homogeneity in all gum species. Additionally, a light scattering study (Wang, Burchard, Cui, Huang, & Phillips, 2008), rheology studies (Li et al, 2009(Li et al, , 2011 as well as a few spectra presented by Dror et al (Dror et al, 2006) suggest some self-association in solution.…”

Section: Hydrophobic Interaction Chromatographymentioning

confidence: 93%

Gum Arabic in solution: Composition and multi-scale structures

et al. 2019

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Gum Arabic is a natural acacia tree exudate containing hyperbranched polysaccharides and proteins. Here, we perform a dual chromatographic separation together with small-angle X-ray and neutron scattering structural characterizations. We show that the different species present in Gum Arabic can not be easily classified in distinct families. They are rather build from various combinations of two building blocks that are evidenced by a mismatch between small-angle X-ray and neutron scattering. One block corresponds to hyperbranched polysaccharides, which we describe as three-dimensional multi-scale porous colloids possessing three length scales of 7, 2 and 0.7 nm. The other block corresponds to protein chains that organize as Gaussian chains in solution and are prone to aggregation. A large array of polysaccharide/protein conjugates was identified, which differs in size, hydrophobicity and amino-acid content. Still, their structure is always the juxtaposition of the two building blocks structures. Additionally, small-angle neutron scattering reveals that large-scale structures are ubiquitous in Gum Arabic solutions and originate from the self-association of both free and conjugated polypeptide chains. Despite its compositional complexity, Gum Arabic solutions thus possess a robust multi-scale structure that is mainly impacted by concentration and ionic repulsions.

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Section: Hydrophobic Interaction Chromatographymentioning

confidence: 93%

Gum Arabic in solution: Composition and multi-scale structures

et al. 2019

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“…This viscosity altering behaviour of gum Gatifolia has a major effect on the PV and FV values of the extruded samples. The viscosity altering behaviour of Super Gum™ is more complex and related to the unique shear thinning properties it has been reported to process 36.…”

Section: Resultsmentioning

confidence: 99%

Novel use of Acacia senegal (Super Gum™) and Anogeisus latifolia (Gatifolia SD) as functional ingredients in extruded snack products: Their role in manipulating product characteristics and modulating the potential glycaemic response of snack foods

et al. 2012

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Acacia senegal (in the form of Super Gum TM ) and Anogeissus latifolia (in the form of gum Gatifolia SD) were used in the manufacture of ready to eat extruded cereal snack products. Inclusions rates were 0, 5, 10 and 15% w/w replacement levels for wheat flour from a control recipe. The inclusion of Super Gum TM and Gatifolia increased product expansion and reduced product density compared to a cereal flour based control snack product. Inclusion of the gum materials also decreased the hardness of the snack products whilst increasing the crispiness of the product (number of fracture peaks recorded during axial compression of samples). Glucose area under the curve (AUC) measurements obtained using in vitro digestion procedures illustrated that the potential glucose release of snack products was reduced by more than 30% by the inclusion of Gatifolia and Super Gum TM at 15% w/w compared to the control sample. Such a reduction in potential glucose release was not dose responsive. These results illustrate a potential nutritional benefit of the utilisation of Gatifolia and Super Gum TM in the ready to eat snack food sector of the food industry.

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“…To narrow our search range, we chose food-grade thickening agents that were likely to be biocompatible and not interfere with bacterial growth, and also displayed thixotropic properties for accurate screen printing. We characterized three possible chemical thickeners to use as resuspension mediums: (1) XG, an extracellular polysaccharide of the bacterium Xanthomonas campestris, 30 (2) GA, a natural gum made from the hardened sap of the acacia tree, 31 and (3) CMC, a derivative of cellulose found in plants. 32 Each solution was formulated to a concentration that was qualitatively similar in viscosity to the commercially purchased silk screen medium.…”

Section: Screen Patterning Mediums For Bacteriamentioning

confidence: 99%

Spatial Control of Bacteria Using Screen Printing

Moon

Fritz

Singer

et al. 2016

3D Printing and Additive Manufacturing

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Synthetic biology has led to advances in both our understanding and engineering of genetic circuits that affect spatial and temporal behaviors in living cells. A growing array of native and synthetic circuits such as oscillators, pattern generators, and cell-cell communication systems has been studied, which exhibit spatiotemporal properties. To better understand the design principles of these genetic circuits, there is a need for versatile and precise methods for patterning cell populations in various configurations. In this study, we develop a screen printing methodology to pattern bacteria on agar, glass, and paper surfaces. Initially, we tested three biocompatible resuspension media with appropriate rheological properties for screen printing. Using microscopy, we characterized the resolution and bleed of bacteria screen prints on agar and glass surfaces, obtaining resolutions as low as 188 μm. Next, we engineered bacterial strains producing visible chromoproteins analogous to the cyan, magenta, and yellow subtractive color system for the creation of multicolored bacteria images. Using this system, we printed distinct populations in overlapping or interlocking designs on both paper and agar substrates. These proof-of-principle experiments demonstrated how the screen printing method could be used to study microbial community interactions and pattern formation of biofilms at submillimeter length scales. Overall, our approach allows for rapid and precise prototyping of patterned bacteria species that will be useful in the understanding and engineering of spatiotemporal behaviors in microbial communities.

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Rheological properties of gum arabic solution: From Newtonianism to thixotropy

Cited by 56 publications

References 29 publications

Gum Arabic in solution: Composition and multi-scale structures

Gum Arabic in solution: Composition and multi-scale structures

Novel use of Acacia senegal (Super Gum™) and Anogeisus latifolia (Gatifolia SD) as functional ingredients in extruded snack products: Their role in manipulating product characteristics and modulating the potential glycaemic response of snack foods

Spatial Control of Bacteria Using Screen Printing

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