Formation of κ-carrageenan–gelatin polyelectrolyte complexes studied by 1H NMR, UV spectroscopy and kinematic viscosity measurements

Voron’ko, Nicolay G.; Derkach, Svetlana R.; Vovk, Mikhail A.; Tolstoy, Peter M.

doi:10.1016/j.carbpol.2016.06.060

Cited by 32 publications

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“…An increase in absorption in the structureless absorption band (see the right-hand parts of the spectra of the mixtures) can be reasonably ascribed to light scattering by relatively large particles of the complexes. An increase in absorption in this spectral region and a red shift of the absorption maximum in the gelatin UV spectra were also observed for mixtures with κ-carrageenan [11] and sodium alginate [13]. An analysis of the FTIR spectra of the mixtures at various ratios, Z (Figure 9), compared with the FTIR spectra of individual components and characteristic absorption bands ( An analysis of the FTIR spectra of the mixtures at various ratios, Z (Figure 9), compared with the FTIR spectra of individual components and characteristic absorption bands (Table 1) [27][28][29], allows us to distinguish the type of interactions that occurs.…”

Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 76%

“…The pH values of chitosan and its mixtures with gelatin were in a range of 3.1-3.9. One can find the details of characterisation of the samples used in [11][12][13].The main method used for studying the structural transformation was FTIR analysis. The FTIR spectra of the samples were obtained using an FTIR spectrometer (Shimadzu FTIR Tracer-100 and Shimadzu IRAffinity-I, Kyoto, Japan) at a 4 cm −1 resolution by accumulating 256 scans in a range of 3600-800 cm −1 [14,15].…”

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confidence: 99%

“…The pH values of chitosan and its mixtures with gelatin were in a range of 3.1-3.9. One can find the details of characterisation of the samples used in [11][12][13].…”

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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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confidence: 59%

Section: Resultsmentioning

confidence: 76%

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confidence: 99%

“…The pH values of chitosan and its mixtures with gelatin were in a range of 3.1-3.9. One can find the details of characterisation of the samples used in [11][12][13].…”

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confidence: 99%

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Polyelectrolyte Polysaccharide–Gelatin Complexes: Rheology and Structure

et al. 2020

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“…It is also observed that there is an attraction between Gel8 and Kca2 hydrogel pieces ( Figure 5.7 (c)). [170]. GelMA was synthesized from Gel [167].…”

Section: Evaluation Of Interaction Between Kca2 and Gelma10mentioning

confidence: 99%

Study of hydrogels for 3D printing of constructs with strong interfacial bonding

Li¹

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Hydrogels are the most appealing candidates of biomaterials for bioprinting. In this field of bioprinting, the lack of suitable hydrogels remains a major challenge. Thus, choosing appropriate hydrogels is the key to successfully print self-supporting 3D constructs. Most importantly, the design criteria regarding the bioinks and the obtained constructs should be made clear in advance. Therefore, the first task of this study is to clarify the design criteria regarding the important properties of a potential bioink and the generated 3D construct, including rheological, interfacial, structural, biological, and degradation properties, which are crucial for printing of complex and functional 3D structures. A method is developed for evaluating the printability of a candidate hydrogel through simulating its rheological behaviors before, during, and after printing. After that, two novel strategies are proposed in order to obtain multilayered hydrogel constructs with strong interface bonding. In the first strategy, trisodium citrate (TSC) acts as a chelating agent to remove the superficial Ca 2+ at each layer. The subsequent post-crosslinking of constructs in a calcium chloride bath will further create the crosslinks and enhance the adhesion between adjacent layers. The second strategy for improving the adhesion between printed layers of a construct is to exploit the interaction between two oppositely charged hydrogels. On the basis of these two strategies, the exciting results have been obtained, which include strong interfacial bonding between two layers of the printed structures, good shape fidelity Even though I have put in great effort for completion of this thesis, it would not have been possible without the support and help of many individuals and organizations. I would like to extend my sincerest thanks to all of them. Firstly, I would like to express my gratitude to my supervisor, Prof. Lin Li for giving me an opportunity to be his student. His valuable guidance, warm encouragements motivated me to conduct experiments, write papers and complete my thesis. I have benefitted much from his rigorous attitude towards scientific research. Special thanks are given to my lab mate and close friend, Dr. Yu Jun Tan, for her assistance, knowledge sharing and valuable discussion. I also appreciate my group member Dr. Sijun Liu, who provides his assistance during my PhD study. My appreciation also goes to the other two group members, Mr Anil Kumar Bastola and Miss Ying Zhen Low, for their encouragement and accompany.

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Self‐Oscillating 3D Printed Hydrogel Shapes

Medina

Gold

Cooper

et al. 2021

Adv Materials Technologies

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The BZ reaction involves the continuous exchange of electrons, producing a dynamic shift from a reduced to oxidized state of a metallic atom. This active electron movement results in spatiotemporal patterns that provide a platform to study and understand nature. [3] A range of self-oscillating polymers are designed by incorporating metal catalysts to polymer matrices. [4] Different architectures are developed based on BZ reaction in past including porous microstructures, [5] microgels, [6,7] comb-type gels, [8] polyrotaxanes, [9] polymer brushes, [10] and micelles. [11] Furthermore, the force generated by the BZ reaction in the self-oscillating polymers have be used as propulsive system: [12] tubular-shaped gels; [13] ciliary motion in arrays of PMMA gels; [14] active surfaces transported microbodies; [15] and a cylinder-shaped gel self-walking structure. [16] Previous studies have confined the BZ reaction in different hydrogel systems fabricated using different approaches. Initial studies used flask-mediated polymerizations and microfluidics to produce a variety of hydrogels, [16,17] consisting of micelles Materials, [18] linear chains, [7,19] brushes, [20] etc. Microfluidics can fabricate 3D hydrogels with precise control, but their size is limited to the macro-and micro-length scale. [21] Other studies employed engineering techniques such as UV patterning [22] and microdispensing [23] to fabricate hydrogels; however, the Belousov-Zhabotinsky (BZ) reactions have been used to investigate periodic spatial patterns due to the oscillatory nature of the reaction. However, these systems have not been confined, nor controlled, in macro-scaled architectures, making it hard to translate observations to natural behavior. Here, a poly(electrolyte) complex is designed that can be ionically or covalently reinforced to construct 3D geometries with additive manufacturing techniques. Printed geometries varied in shape, size, and angle to investigate spatiotemporal pattern formation in 3D. Size variations correlated to trends in oscillating pattern frequencies, demonstrating a geometry effect on spatial alterations. Overall, the combination of 3D printing techniques with selfoscillating chemical reactions allows to model, study, and further understand macro-scale patterns observed in nature. The proposed approach can be used to design smart structure to replicate biological oscillators such as cardiac arrhythmias, neuron signaling, and camouflage skin patterns.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/admt.202100418.

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Formation of κ-carrageenan–gelatin polyelectrolyte complexes studied by 1H NMR, UV spectroscopy and kinematic viscosity measurements

Cited by 32 publications

References 47 publications

Polyelectrolyte Polysaccharide–Gelatin Complexes: Rheology and Structure

Polyelectrolyte Polysaccharide–Gelatin Complexes: Rheology and Structure

Study of hydrogels for 3D printing of constructs with strong interfacial bonding

Self‐Oscillating 3D Printed Hydrogel Shapes

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