New alkylated xanthan gum as amphiphilic derivatives: Synthesis, physicochemical and rheological studies

Sara, Hamiouda; Yahoum, Madiha Melha; Lefnaoui, Sonia; Hadjsadok, Abdelkader; Moulai‐Mostefa, Nadji

doi:10.1016/j.molstruc.2020.127768

Cited by 35 publications

(26 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Peak at 1. unit C, which is known as the more deshielded proton is located at 5.2 ppm [24]. These findings are in agreement with NMR spectra recorded for xanthan [25][26][27][28]. The evidence that the acrylic acid esterification reaction took place is given by the NMR spectrum of the modified xanthan in Figure 3b.…”

Section: Nmr Characterizationsupporting

confidence: 87%

Xanthan Matrix as Drug ZDelivery System

Anghel¹,

Dinu²,

Doroftei³

et al. 2021

Rev. Chim.

View full text Add to dashboard Cite

Here we present a new drug delivery system based on xanthan esterified with acrylic acid. This material served as a matrix for the incorporation of bioactive substances with antimicrobial and anti-inflammatory properties. The materials were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR) and Scanning Electron Micrography (SEM). Mechanical strength tests showed a substantial improvement in the resilience and flexibility of the polymer matrix modified by esterification under conditions of mechanical stress. The release of bioactive substances from the basic matrix follows a Korsmeyer-Peppas type kinetics. The modified xanthan-based transport system was shown to be antimicrobially active with an inhibition rate of almost 100% on gram-positive and gram-negative bacteria. The obtained results recommend this biomaterial for the manufacture of transdermal drug delivery devices.

show abstract

Section: Nmr Characterizationsupporting

confidence: 87%

Xanthan Matrix as Drug ZDelivery System

Anghel¹,

Dinu²,

Doroftei³

et al. 2021

Rev. Chim.

View full text Add to dashboard Cite

show abstract

“…According to the DTG curves, the maximum decomposition rate was achieved when the temperature was 292 °C. The reason for the weight loss at this stage was the decomposition of polysaccharide groups or hydrophobic side chains, including the decarboxylation of side chains and carbocyclic acid groups . Finally, the weight loss of XG and MXG at 600 °C reached 55.43% and 56.82%, and the residual weight was 34.41% and 31.46%.…”

Section: Resultsmentioning

confidence: 97%

“…This was attributed to the dehydration of the sample caused by the rupture of the hydrogen bond of the polar group of the polysaccharide. 22,38 The second weight loss stages of XG and MXG were from 266.7 to 322.1 °C and from 267.8 to 321.2 °C, respectively. According to the DTG curves, the maximum decomposition rate was achieved when the temperature was 292 °C.…”

Section: Methodsmentioning

confidence: 99%

“…Wang et al 21 used the maleic anhydride/1-octadecene esterification method to prepare modified xanthan gum, which improved the performance on salt tolerance, temperature resistance, and shear endurance of xanthan gum. Sara et al 22 used the Williamson synthesis method to graft octyl groups onto the xanthan gum backbone and prepared hydrophobically modified xanthan gum derivatives with different degrees of substitution using ethanol and DMSO as two solvents. The results showed that rheological properties and thermal stability increase as the degree of substitution increases.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced Oil Recovery Performance and Solution Properties of Hydrophobic Associative Xanthan Gum

Qin

Liu

et al. 2021

Energy Fuels

View full text Add to dashboard Cite

Xanthan gum (XG) is one of the widely used biopolymers in oilfield development. It has low cost and will not pollute the environment. However, its limited temperature and salt tolerance restricts its application in high temperature and high salt reservoirs. An environmentally friendly hydrophobic associative polymer was prepared by grafting long-chain alkyl groups onto xanthan gum through an etherification reaction for enhanced oil recovery (EOR). The hydrophobically modified xanthan gum (MXG) was characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC), and thermogravimetric analysis (TGA). Due to the hydrophobic association, MXG had excellent thickening, rheological properties, antiaging, temperature, and salt resistance properties. In the 30 g/L NaCl solutions, the viscosity of MXG (335 mPa s) was about 3 times that of XG (115.3 mPa s) at 65 °C. Whether in a high-salt solution (20 g/L NaCl) or reservoir injection water (mineralization of water is 7542 mg/L), modified xanthan gum can show good antiaging properties. The polymer flooding experiments showed that EOR of MXG is 25%, 7% higher than that of XG. The macroscopic mechanism of MXG flooding was studied. In summary, MXG has a wide range of applications in EOR.

show abstract

“… 13 , 14 Such branched polyelectrolyte chains can build up a network even at low concentrations; thus, xanthan solutions show a pseudoplastic behavior with predominant conservative properties. 15 − 18 However, while at low frequencies the predominance of the elastic ( G ′) over the viscous ( G ″) modulus is similar to the behavior of a gel, XG is a nongelling agent when it is used alone; thus, its solutions retain the flow properties required for their effective spreading over surfaces. 19 XG is commonly used as a rheology modifier in food, 20 , 21 cosmetic, agricultural, pharmaceutical, 22 and petroleum industry applications, 14 , 19 as well as in home- and personal care product formulations.…”

Section: Introductionmentioning

confidence: 99%

Rheological Response of Polylactic Acid Dispersions in Water with Xanthan Gum

et al. 2022

View full text Add to dashboard Cite

In this work, the rheological behavior of stable poly(lactic acid) (PLA) dispersions in water, intended for coating applications, was investigated. The newly prepared dispersion consists of PLA particles with an average diameter of 222 ± 2 nm based on dynamic light scattering (DLS) and scanning electron microscopy (SEM) analyses, at concentrations varying in the 5–22 wt % range. Xanthan gum (XG), a bacterial polysaccharide, was used as a thickening agent to modulate the viscosity of the formulations. The rheological properties of the PLA dispersions with different XG and PLA contents were studied in steady shear, amplitude sweep, and frequency sweep experiments. Under steady shear conditions, the viscosity of all the formulations showed a shear-thinning behavior similar to XG solutions in the whole investigated 1–1000 s –1 range, with values dependent on both PLA particles and XG concentrations. Amplitude and frequency sweep data revealed a weak-gel behavior except in the case of the most diluted sample, with moduli dependent on both PLA and XG contents. A unified scaling parameter was identified in the volume fraction (ϕ) of the PLA particles, calculated by considering the dependence of the continuous phase density on the XG concentration. Accordingly, a master curve at different volume fractions was built using the time–concentration–superposition approach. The master curve describes the rheological response of the system over a wider frequency window than the experimentally accessible one and reveals the presence of a superimposed β relaxation process in the high-frequency region.

show abstract

New alkylated xanthan gum as amphiphilic derivatives: Synthesis, physicochemical and rheological studies

Cited by 35 publications

References 70 publications

Xanthan Matrix as Drug ZDelivery System

Xanthan Matrix as Drug ZDelivery System

Enhanced Oil Recovery Performance and Solution Properties of Hydrophobic Associative Xanthan Gum

Rheological Response of Polylactic Acid Dispersions in Water with Xanthan Gum

Contact Info

Product

Resources

About