The rheology of hydrogels based on chitosan–gelatin (bio)polyelectrolyte complexes

Derkach, Svetlana R.; Voron’ko, Nicolay G.; Sokolan, Nina I.

doi:10.1080/01932691.2016.1250218

Cited by 30 publications

(25 citation statements)

References 41 publications

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“…In some cases, σ Y begins to abruptly grow at some critical value of Z, and this threshold value Z* corresponds to the formation of complexes, whereas in other cases, the dependence of σ Y (Z) passes through a maximum at some Z* value. The nonmonotonic dependence of the yield stress indicates certainly the influence of the complex composition on its gel-forming properties and the strength of the gel structure [26]. In some cases, σY begins to abruptly grow at some critical value of Z, and this threshold value Z* corresponds to the formation of complexes, whereas in other cases, the dependence of σY(Z) passes through a maximum at some Z* value.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Polyelectrolyte Polysaccharide–Gelatin Complexes: Rheology and Structure

et al. 2020

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General features of rheological properties and structural peculiarities of polyelectrolyte polysaccharide–gelatin complexes were discussed in this paper. Experimental results were obtained for typical complexes, such as κ-carrageenan–gelatin, chitosan–gelatin and sodium alginate–gelatin complexes. A rheological method allows us to examine the physical state of a complex in aqueous phase and the kinetics of the sol–gel transition and temperature dependences of properties as a result of structural changes. The storage modulus below the gelation temperature is constant, which is a reflection of the solid-like state of a material. The gels of these complexes are usually viscoplastic media. The quantitative values of the rheological parameters depend on the ratio of the components in the complexes. The formation of the structure as a result of strong interactions of the components in the complexes was confirmed by UV and FTIR data and SEM analysis. Interaction with polysaccharides causes a change in the secondary structure of gelatin, i.e., the content of triple helices in an α-chain increases. The joint analysis of the structural and rheological characteristics suggests that the formation of additional junctions in the complex gel network results in increases in elasticity and hardening compared with those of the native gelatin.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Polyelectrolyte Polysaccharide–Gelatin Complexes: Rheology and Structure

et al. 2020

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“…Dependence of chitosan solution viscosity on shear stress. T=20 ∘ C, C ℎ = 5%, with C 3 = 0.33 N. Chitosan obtained by one-time (1), two-time (2), three-time (3) and four-time (4) deacetylation.The rheological behavior of chitosan solutions with concentration of 0.1-1.0% and MW of some 200-300 kDa was studied in[18]. It was found that according to their rheological properties, such solutions are systems close to Newtonian fluids.…”

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Effect of Heterogeneous Deacetylation on the Properties of Northern Shrimp Chitin and Chitosan

Dolgopiatova

Kuchina

Dyakina

et al. 2020

KLS

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The effect of alkaline treatment of shrimp chitin on the molecular weight, the degree of deacetylation and degree of crystallinity of the resulting chitosan is studied. The viscosity of chitosan solutions from repeatedly deacetylated chitin is studied. It is shown that repeated treatment of chitin/chitosan with alkali causes the destruction of polysaccharide macromolecules. After four-time deacetylation and one-time deacetylation of chitin/chitosan for four hours, the molecular weight of the polysaccharide decreases by ten times. The maximum degree of chitosan deacetylation under experimental conditions was 92.0 -92.5%. The diffractograms of chitin and chitosan from the Northern shrimp are of the form typical for samples containing an amorphous phase in addition to a crystalline phase. The degree of crystallinity of chitin from Northern shrimp was 40.8%, of chitosan samples after one-, two-, and three-time deacetylation was 62-65%. For a sample of chitosan obtained after four-time deacetylation, recrystallization, and drying in a freeze dryer, the degree of crystallinity is close to the degree of crystallinity of shrimp chitin. The investigated acetic acid chitosan solutions with a concentration of 5% (wt.) and the chitosan molecular weight of 250, 160 and 130 kDa in their rheological properties are liquid-like non-Newtonian systems, their viscosity decreasing with increasing shear stress. After four-time deacetylation of chitin, the viscosity of chitosan solutions practically does not change with increasing shear stress, which apparently can be due to a significant decrease in the molecular weight of chitosan under these conditions.

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“…The presence of a low storage modules is due to electrostatic repulsions of charges between the chains of chitosan and the copolymer, and this is related to the molar ratio rates and proportional to the decreases of anionic charges. This is evident for the hydrogel formed by CP1, which presents a greater number of positive charges in the polymer chains, preventing the formation of the hydrogel by the strong influence of the electrostatic repulsions …”

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confidence: 99%

Hydrogels based on alkylated chitosan and polyelectrolyte copolymers

Palacio

Urbano

Rivas

2018

J of Applied Polymer Sci

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Hydrogels formed by alkylated chitosan with N‐(3‐chloro‐2‐hydroxypropyl) trimethylammonium chloride and synthetic copolymers forming polyelectrolyte complexes are presented. The copolymer polyelectrolytes were synthesized through free‐radical polymerization. Their compositions and reactivity parameters were determined by the Finemann–Ross and Kelen–Tüdos methods. The copolymers have structures that tend to be alternating. The hydrogels were characterized by thermogravimetric analysis, Fourier transform infrared spectroscopy, proton nuclear magnetic resonance, scanning electron microscopy, and water solubility tests at different pH values. For the formation of the hydrogels, they were prepared using different molar ratios of alkylated chitosan and polyelectrolyte copolymers. Their stability was determined by rheological analysis, evaluating the response as a function of strain and frequency. The rheological tests showed that the stability of the polyelectrolyte complexes followed the trend ChT‐CP2 > ChT‐CP3 > ChT‐CP1 due to the presence of greater electrostatic interactions. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46556.

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The rheology of hydrogels based on chitosan–gelatin (bio)polyelectrolyte complexes

Cited by 30 publications

References 41 publications

Polyelectrolyte Polysaccharide–Gelatin Complexes: Rheology and Structure

Polyelectrolyte Polysaccharide–Gelatin Complexes: Rheology and Structure

Effect of Heterogeneous Deacetylation on the Properties of Northern Shrimp Chitin and Chitosan

Hydrogels based on alkylated chitosan and polyelectrolyte copolymers

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