Binding of bivalent cations by xanthan in aqueous solution

Bergmann, Dirk; Furth, Guido; Mayer, Christian

doi:10.1016/j.ijbiomac.2008.06.001

Cited by 93 publications

(56 citation statements)

References 19 publications

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“…The effect of bivalent cations on the flow behaviour of XG solutions has been investigated in several studies 3,10,[12][13] . At increased ionic strength the ordered structure of XG predominates and this impacts the viscosity of the XG gel 12 . Also, depending on the initial concentration of XG, increasing ionic strength can either increase or decrease the overall hydrogel viscosity.…”

Section: Xanthomonas Compestrismentioning

confidence: 99%

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

“…Thus, at low polymer content the viscosity of XG solutions will decline upon the addition of salts, which increases ionic strength 12,22 . Bergmann et al (2008) observed a viscosity decrease in a 0.15% XG solution when ion content was increased 12 . This phenomenon occurs because in dilute solutions charge screening with calcium ions decreases the polymer's interaction with water; allowing the XG chains to assume ordered helical molecular conformations which occupy a smaller hydrodynamic volume leading to a decrease in viscosity 22 .…”

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

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Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Groves

Chaw

2014

Drug Development and Industrial Pharmacy

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Xanthan gum, a hydrophilic biopolymer with modified release properties, was used to produce directly compressed matrix tablets containing a model drug, Sodium paminosalicylate. Three formulations were prepared, each containing a different calcium dihydrate salt: Calcium Chloride, Calcium Sulfate or Dibasic Calcium Phosphate. The aim of the investigation was to relate the calcium ion content and solubility of the calcium salt to the in vitro drug release profile of the xanthan matrices. Tablet hydration, erosion and drug release were determined in distilled water using the BP paddle method. The data showed that the overall drug release was the greatest with addition of calcium Sulfate, followed by Calcium Chloride and dibasic Calcium Phosphate. The chloride salt formulation displayed the greatest percentage erosion due to rapid mass loss during the initial phase, followed by those with sulfate or phosphate salts. As xanthan gel viscosity increased and drug release was also found to be lower. It can be concluded that drug release is influenced by the solubility of the salt present in the formulation, since these parameters determine the viscosity and structure of the gel layer.

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Section: Xanthomonas Compestrismentioning

confidence: 99%

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

Section: Rheological Characterisation Of Xg Hydrogelsmentioning

confidence: 99%

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Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Groves

Chaw

2014

Drug Development and Industrial Pharmacy

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“…According to (Bergmann et al, 2008) the mechanism of ion capture by water soluble polysaccharides mainly related to formation of complexes of chelate structure. Research of complex formation of PGU with metal ions allows conclude of chelate structure of formed complexes.…”

Section: Pgu Interaction With Water Solutions Of Phenol and Transitiomentioning

confidence: 99%

Polyglucanurethanes: Cross-Linked Polyurethanes Based on Microbial Exopolysaccharide Xanthan

Козак¹,

Hubina²

2012

Polyurethane

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“…Trisaccharide side chains are composed of mannose b-(1 fi 4) glucuronic acid b-(1 fi 2) mannose attached to alternate glucose residues in the backbone by a-(1 fi 3) linkages. 15,16 Their anionic and hydrophilic surface characteristics facilitate interactions with cations 17,18 and other polysaccharides such as glucose, mannose (C 6 H 12 O 6 ), potassium gluconate (C 6 H 11 KO 7 ), acetate (CH 3 CO 2 À ), and pyruvate (CH 3 COCOOH), inducing stronger gelation. 19 Tamarind gum, a crude extract of tamarind seeds, is rich in polysaccharide ($65-72%), 20 which contains glucose, xylose, and galactose units, in a molecular ratio of $3:2:1, respectively.…”

Section: Introductionmentioning

confidence: 99%

Urea fertilizer coated with biodegradable polymers and diatomite for slow release and water retention

Mukerabigwi

Wang

et al. 2015

J Coat Technol Res

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Slow release fertilizers (SRFs) are of vital importance to improve agricultural efficiency. However, their use is still limited due to their relatively high costs. Additionally, most of coating materials used to produce SRFs are nonbiodegradable and toxic to the soil. In this context, we utilized various biopolymers such as tamarind, xanthan, and guar gums together with diatomite to coat urea fertilizer granules. In this study, tamarind-urea-diatomite (TUD), guar-urea-diatomite (GUD), and xanthan-urea-diatomite (XUD) SRF granules were prepared in the presence of epichlorohydrin as crosslinker. The nutrients slow release behavior and the water retention capacity of these SRFs in soil were determined. The water absorbency of the product was 89% TUD, 93% GUD, and 142% XUD of its own weight when it was allowed to swell in tap water at room temperature for 2 h. Poly(methacrylic acid) was applied as the outermost layer of XUD to improve the nitrogen slow release efficiency of XUD SRFs. The results showed that the product had an excellent nutrients slow release property of 79.5% and good water retention capacity of 62.9% after 28 days. This suggested that XUDM could effectively improve the utilization of fertilizer. Furthermore, being biodegradable and low cost could be beneficial in agricultural and horticultural applications.

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Binding of bivalent cations by xanthan in aqueous solution

Cited by 93 publications

References 19 publications

Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Incorporation of calcium salts into xanthan gum matrices: hydration, erosion and drug release characteristics

Polyglucanurethanes: Cross-Linked Polyurethanes Based on Microbial Exopolysaccharide Xanthan

Urea fertilizer coated with biodegradable polymers and diatomite for slow release and water retention

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