Determination of the viscoelastic properties of a homologous series of the fermentation polymer xanthan gum

Arendt, Oliver; Kulicke, Werner‐Michael

doi:10.1002/(sici)1522-9505(19981001)259:1<61::aid-apmc61>3.0.co;2-v

Cited by 13 publications

(2 citation statements)

References 16 publications

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“…XG is a branched, hetero-polysaccharide produced via microbial fermentation of the microorganism Xanthomonas campestris [39]. The primary unit of XG (Figure 5b) consists of a cellulosic backbone composed of two d-glucose units (1-4) β-linked to a side-chain of d-mannose and d-glucuronic acid units at a ratio of 2:1, respectively [40]. d-Mannose, which is connected to the main backbone, is attached to an acetyl group at O6, while approximately half of the terminal d-mannose forms a pyruvic acid group between carbons C4 and C6.…”

Section: Xanthan Gum (Xg)mentioning

confidence: 99%

An Overview of Chitosan-Xanthan Gum Matrices as Controlled Release Drug Carriers

Dadou¹,

Antonijević²,

Chowdhry³

et al. 2018

Chitin-Chitosan - Myriad Functionalities in Science and Technology

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Naturally occurring polysaccharides and/or their chemically modified derivatives have been widely investigated in relation to their use as components of controlled release systems for drug delivery. The aforementioned is due, in part, to their distinct properties such as abundant availability and biocompatibility as well as environmental and economic advantages. Chitosan (CS) and xanthan gum (XG) based matrices have received growing scientific/pharmaceutical interest as oral controlled release drug carriers. Herein, recent advances spanning the last two decades in CS-XG based drug delivery systems are reviewed with the emphasis being on oral tablet formulations, due to their versatility as pharmaceutical dosage forms. The mechanism of interaction between CS and XG, by means of computational and experimental approaches, is scrutinized. Results obtained from the literature establish the possibility of fabricating a controlled release drug delivery system based on CS and XG matrices. This can be achieved by monitoring and manipulating the physiochemical properties of the two polymers as well as the experimental variables affecting their drug retardation efficiency, without the need to employ special equipment or sophisticated experimental techniques/methodologies.

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Section: Xanthan Gum (Xg)mentioning

confidence: 99%

An Overview of Chitosan-Xanthan Gum Matrices as Controlled Release Drug Carriers

Dadou¹,

Antonijević²,

Chowdhry³

et al. 2018

Chitin-Chitosan - Myriad Functionalities in Science and Technology

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“…Xanthan gum is a hetero-polysaccharide produced via microbial fermentation of the microorganism Xanthomonas campestris [5]. The primary unit of Xanthan gum (Figure 1) consists of a cellulosic backbone composed of two D -glucose units (1)(2)(3)(4) β-linked to a side-chain of D -mannose and D -glucuronic acid units at a ratio of 2:1, respectively [6]. D -Mannose, which is connected to the main backbone, is attached to an acetyl group at O6, while approximately half of the terminal D -mannose forms a pyruvic acid group between carbons C4 and C6.…”

Section: Introductionmentioning

confidence: 99%

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2020

AJC

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In this work, the formation of capsules in xanthan gum and complexing solutions of Fe III is structurally evaluated. These capsules have a spheroid shape that, when dried, collapse into disc shapes. These spheroids are made up of microspheres that partially explain this collapse. The backscattered SEM image shows areas rich in Fe and others poorer in this metal, the EDX analysis confirms this. FTIR chromatograms show a clear shift at approximately 1620 cm-1 due to the formation of the xanthan gum-Fe III complex. This work also proposes a structure, theoretically demonstrated, between xanthan gum and Fe III, which can explain what the biopolymeric structure bending procedure is like due to the presence of Fe III, a model called TransbiHook.

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Dynamic and capillary rheology of LDPE‐EVA–based thermoplastic elastomer: Effect of silica nanofiller

2009

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The effect of pristine silica nanoparticles on the dynamic and capillary rheology of a model LDPE‐EVA thermoplastic elastomeric system is explored in this paper. The pristine silica nanoparticles were melt‐blended with the LDPE‐EVA system at 1.5, 3, and 5 wt% loadings, respectively, by varying the sequence of addition. In one of the compositions, coupling agent bis‐[3‐(triethoxysilyl)propyl] tetrasulphide (Si‐69) was used to improve the interaction of hydrophilic silica particles with polymer matrix. Results obtained reveal that the viscoelastic behavior of such composites is influenced remarkably by loadings of silica, variation of sequence, and addition of Si‐69. Upon addition of coupling agent, G′ value increases especially at higher strain levels due to increased polymer‐filler interactions. All systems with various loading of nanosilica represent an increase in elastic response with increasing frequency. Both the unfilled and filled blends exhibit rheological behavior of non‐Newtonian fluids. But interestingly, the viscoelastic response varies markedly with the temperature. The dynamic and steady shear rheological properties register a good correlation in regard to the viscous vs. elastic response of such systems. Finally, the rheological behavior is correlated with morphology of the present system processed at various shear rates. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers

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Determination of the viscoelastic properties of a homologous series of the fermentation polymer xanthan gum

Cited by 13 publications

References 16 publications

An Overview of Chitosan-Xanthan Gum Matrices as Controlled Release Drug Carriers

An Overview of Chitosan-Xanthan Gum Matrices as Controlled Release Drug Carriers

Untitled

Dynamic and capillary rheology of LDPE‐EVA–based thermoplastic elastomer: Effect of silica nanofiller

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