Rheological and kinetic study of the ultrasonic degradation of xanthan gum in aqueous solution: Effects of pyruvate group

Li, Ruoshi; Feke, Donald L.

doi:10.1016/j.carbpol.2015.02.018

Cited by 25 publications

(14 citation statements)

References 21 publications

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“…They reported that xanthan exhibited a more compacted form in the Na 2 SO 4 solution. 30 Their results are consistent within this study.…”

Section: When the Nano 3 -Pdadmac Solution Was Irradiatedsupporting

confidence: 92%

Investigation of a polyelectrolyte degradation with viscometry

Akyüz¹

2018

Mater. Tehnol.

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Ultrasonic degradation of a cationic polyelectrolyte, polydiallyl dimethylammonium chloride in aqueous solutions was investigated at 25°C for the first time according to the literature. Degradations were performed at a varying molar concentration of NaCl (0.05-0.50-1.00 M), using different sodium salts with constant molar concentrations (Na2SO4, NaNO3, NaBr) in the solution and at medium pH values of 1, 3 and 5. The ultrasound frequency (20 kHz), intensity and polymer concentration were kept constant (0.005 g/mL). By doing so, only the effect of the solvent quality was studied. The degradation process was characterized with viscometry and the Ovenall/Harrington/Madras model was successfully applied to predict the degradation parameters. The results show that the degradation efficiency depends strongly on the solvent quality.

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“…They reported that xanthan exhibited a more compacted form in the Na 2 SO 4 solution. 30 Their results are consistent within this study.…”

Section: When the Nano 3 -Pdadmac Solution Was Irradiatedsupporting

confidence: 92%

Investigation of a polyelectrolyte degradation with viscometry

Akyüz¹

2018

Mater. Tehnol.

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“…Polysaccharides possess high intrinsic viscosity which is not conducive to absorption and diffusion in vivo , thus limiting their biological activity (Li and Feke ; Yan and others ; Yu and others ). A comparative study on the changes between acetylated derivatives of polysaccharides with small molecular weight from Enteromorpha linza and its original form has reported that, as the degree of substitution of acetyl increased from 0 to 0.35, the intrinsic viscosity of modified polysaccharide solutions reduced from 34.67 to 22.92 mL/g, but its antioxidant activity increased.…”

Section: The Effect Of Molecular Modification On Physical and Chemicamentioning

confidence: 99%

Molecular Modification of Polysaccharides and Resulting Bioactivities

Xiong

Lai

et al. 2015

Comp Rev Food Sci Food Safe

392

172

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Polysaccharides are ideal natural resources for supplements and pharmaceuticals that have received more and more attention over the years. Natural polysaccharides have been shown to have fewer side effects, but because of their inherently physicochemical properties, their bioactivities were difficult to compare with those of synthetic drugs. Thus, researchers have modified the structures and properties of natural polysaccharides based on structure-activity relationships and have obtained better functionally improved polysaccharides. This review focuses on the major modification methods of polysaccharides, and discusses the effect of molecular modification on their physicochemical properties and bioactivities. Molecular modification methods mainly include chemical, physical, and biological changes. Chemical modification is the most widely used method; it can significantly increase the water solubility and bioactivities of polysaccharides by grafting onto other groups. Physical and biological modifications only change the molecular weight of a polysaccharide, and thereby change its physicochemical properties and bioactivities. Most of the molecular modifications bring about an increase in the antioxidant activity of polysaccharides, and among these, sulfated and acetylated modifications are very common. Furthermore, phosphorylation modification is the most common application to increase antitumor activity, and modified polysaccharides have been shown to have anti-HIV activity as the result of sulfated modification.

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“…This result indicates that molecular conformational of LBG is less sensitive to salt effects, and also that the molecular chains have a more contracted conformation than that of xanthan. Moreover, the value of relative chain stiffness parameter of LBG ranged from 0.002 to 0.003, suggesting that its molecular backbone is more rigid than that of xanthan gum (0.008-0.011 for native xanthan gum, 0.001-0.003 for pyruvate-free xanthan gum [25]). …”

Section: Salt Tolerance and Relative Chain Stiffnessmentioning

confidence: 99%

“…The results suggested that addition of salts may have some effect on the hydrodynamic volume of LBG molecules, but not as much effect as is seen for polyelectrolytes. Previous studies of ultrasonic degradation of native xanthan gum solutions and native/depyruvate xanthan gum blends have shown that degradation rates are affected by molecular conformation which can be manipulated through the salt concentrations and choice of salt species [24,25] solutions containing various concentrations of salt to investigate the degree of sensitivity of degradation efficiency to the ionic conditions. Observation of changes in the intrinsic viscosity of the solutions was used to monitor the degradation process.…”

Section: Introductionmentioning

confidence: 99%

Rheological and kinetic study of the ultrasonic degradation of locust bean gum in aqueous saline and salt-free solutions

Feke

2015

Ultrasonics Sonochemistry

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The ultrasonic degradation of locust bean gum (LBG) in aqueous solutions has been studied at 25°C for ultrasonication times up to 120 min. Although LBG is not a polyelectrolyte, the degradation extent and kinetics were found to be somewhat sensitive to the ionic conditions in solution, and this is attributed to changes in molecular conformation that can occur in different salt environments. Ultrasonic degradation was tracked by rheological measurements that lead to the determination of intrinsic viscosity for the LBG molecules. A kinetic model was also developed and successfully applied to characterize and predict the degradation results.

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Rheological and kinetic study of the ultrasonic degradation of xanthan gum in aqueous solution: Effects of pyruvate group

Cited by 25 publications

References 21 publications

Investigation of a polyelectrolyte degradation with viscometry

Investigation of a polyelectrolyte degradation with viscometry

Molecular Modification of Polysaccharides and Resulting Bioactivities

Rheological and kinetic study of the ultrasonic degradation of locust bean gum in aqueous saline and salt-free solutions

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