Rheological and thermogelling properties of commercials chitosan/β-glycerophosphate: Retention of hydrogel in water, milk and UF-milk

Taherian, Ali R.; Lacasse, P.; Bisakowski, Barbara; Pelletier, Marylène; Lanctôt, S.; Fustier, Patrick

doi:10.1016/j.foodhyd.2016.09.031

Cited by 21 publications

(4 citation statements)

References 46 publications

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“…The differences were significant statistically ( p < 0.05), but there was no difference between SA and HSA, as well as G and M + G. Taherian et al noticed that higher concentrations of polysaccharides cause a reduction in the flow behavior index (n) and increase in the flow consistency index (k). It means that the contact between the polymer chains in diluted solutions limits the fluid flow [ 32 ]. With an increase in the concentration of sodium alginate, the coefficient of consistency k increases [ 30 ].…”

Section: Resultsmentioning

confidence: 99%

Biophysico-Chemical Properties of Alginate Oligomers Obtained by Acid and Oxidation Depolymerization

et al. 2021

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The aim of the study was to obtain alginate oligosaccharides by using two degradation methods of sodium alginate (SA): with hydrochloric acid (G—guluronate, M—mannuronate and G + M fractions) and hydrogen peroxide (HAS—hydrolyzed SA), in order to assess and compare their biological activity and physico-chemical properties, with an attempt to produce gels from the obtained hydrolysates. The efficiency of each method was determined in order to select the fastest and most efficient process. The ferric ion reducing antioxidant power (FRAP), the ability to scavenge DPPH free radicals, rheological properties, Fourier Transformed Spectroscopy (FTIR) and the microbiological test against Escherichia coli and Staphylococcus aureus were performed. In order to check the functional properties of the obtained oligosaccharides, the texture profile analysis was assessed. The hydrolysis yield of acid SA depolymerization was 28.1% and from hydrogen peroxide SA, depolymerization was 87%. The FTIR analysis confirmed the degradation process by both tested methods in the fingerprint region. The highest ferric reducing antioxidant power was noted for HSA (34.7 µg), and the highest hydroxyl radical scavenging activity was obtained by G fraction (346 µg/Trolox ml). The complete growth inhibition (OD = 0) of alginate hydrolysates was 1%. All tested samples presented pseudoplastic behavior, only HSA presented the ability to form gel.

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Section: Resultsmentioning

confidence: 99%

Biophysico-Chemical Properties of Alginate Oligomers Obtained by Acid and Oxidation Depolymerization

et al. 2021

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“…The increase of the non-Newtonian behavior of chitosan solutions with concentration was attributed to the chain-expanding structure and consequent increase in entanglement. A recent investigation by Taherian et al [ 59 ] reported that the shear thinning behavior of chitosan depends on chitosan molecular weight and solution concentration. They found that any increase in concentration of chitosan causes a decrease in flow behavior index ( n ) and an increase in consistency coefficient, m , owing to the lower hydrodynamic interactions in dilute solution and the close contact of chains which constrains the flow of concentrated solutions.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Biopolymer Chitosan on the Rheology and Stability of Na-Bentonite Drilling Mud

Abu-Jdayil¹,

Ghannam²,

Ahmed³

et al. 2021

Polymers

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The utilization of greens resources is a grand challenge for this century. A lot of efforts are paid to substitute toxic ingredients of the conventional drilling mud system with nontoxic natural materials. In this paper, the effect of the natural polymer chitosan on the rheology and stability of sodium-bentonite drilling mud was investigated in the polymer concentration range of 0.1–3.0 wt.%. Both the shear and time dependent rheological properties of pure chitosan, pure bentonite and bentonite–chitosan dispersions were studied. Moreover, zeta potential measurements were used to evaluate the stability of bentonite-chitosan suspension. Adding chitosan improved the natural properties of drilling mud, namely: yield stress, shear thinning, and thixotropy. The viscosity of bentonite suspension increased significantly upon the addition of chitosan in the concentration range of 0.5 to 3.0 wt.% forming network structure, which can be attributed to the interactions of hydrogen bonding between -OH clusters on the bentonite surface with the NH group in the chitosan structure. On the other hand, dispersed chitosan–bentonite suspension was observed at low chitosan concentration (less than 0.5 wt.%). Increasing both bentonite and chitosan concentrations led to the flocculation of the bentonite suspension, forming a continuous gel structure that was characterized by noteworthy yield stress. The desired drilling mud rheological behavior can be obtained with less bentonite by adding chitosan polymer and the undesirable effects of high solid clay concentration can be avoided.

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“…The gel structure was not disturbed, but the detachment of surrounding water molecules could be assumed to occur, thus allowing the association of the hydrophobic segments of Xa and CS. 32 This effect was shifted to higher temperatures in the case of the hydrogels dispersed in buffer solutions, proving once more the effect of the ionic dispersion media on the gel properties. The encapsulation of the drug led to the softening of the gels dispersed in water, whereas the opposite effect was observed at higher temperatures for the hydrogels dispersed in the buffer solution, probably because of the effect of stronger electrostatic interactions.…”

Section: Results and Discussion Rheological Analysismentioning

confidence: 87%

Characterization of Neomycin-Loaded Xanthan-Chitosan Hydrogels for Topical Applications

Merlusca¹,

Ibănescu²,

Tuchiluş³

et al. 2019

Cellulose Chem. Technol.

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Xanthan-chitosan hydrogels are recommended for encapsulation and controlled release of therapeutic agents. Chitosan and neomycin sulphate have been shown to have wound healing properties, when used individually, and a synergetic effect when used together. In this study, drug-loaded xanthan-chitosan hydrogels were prepared with two different neomycin sulphate concentrations, as potential topical formulations. These hydrogels were characterized by rheological studies, thermal analyses, for in vitro drug release diffusion, cytotoxicity and antibacterial activity. The results obtained from dynamic rheological experiments demonstrated that the hydrogels behave as weak gels and that their characteristics are strongly influenced by the concentration, pH and temperature. The results provided by thermal analysis suggested that an interaction occurs between xanthan-chitosan and neomycin sulphate. In vitro studies demonstrated good retardation of drug release from the hydrogels. Moreover, cell viability studies showed that the hydrogels are non-cytotoxic. Furthermore, the prepared formulations revealed effective bacterial inhibition when exposed to cultures of Escherichia coli and Staphylococcus aureus.

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Rheological and thermogelling properties of commercials chitosan/β-glycerophosphate: Retention of hydrogel in water, milk and UF-milk

Cited by 21 publications

References 46 publications

Biophysico-Chemical Properties of Alginate Oligomers Obtained by Acid and Oxidation Depolymerization

Biophysico-Chemical Properties of Alginate Oligomers Obtained by Acid and Oxidation Depolymerization

The Effect of Biopolymer Chitosan on the Rheology and Stability of Na-Bentonite Drilling Mud

Characterization of Neomycin-Loaded Xanthan-Chitosan Hydrogels for Topical Applications

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