The rheology of gelatin hydrogels modified by κ-carrageenan

Derkach, Svetlana R.; Ilyin, Sergey O.; Maklakova, A. A.; Куличихин, В. Г.; Malkin, Alexander

doi:10.1016/j.lwt.2015.03.024

Cited by 145 publications

(95 citation statements)

References 35 publications

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“…According to [26,31,32], these up-shifts could be attributed to a (electrostatic interactions between NH 3 + of chitosan and COO − groups of gelatin and hydrogen bonds between both biopolymers). Similar changes in the morphology are also produced by other polysaccharides, for example, gellan [29], and -carrageenan [33]. Also it has been shown that the formation of the strengthened network the chitosan--gelatine PECs hydrogels leads to the significant increase in their viscoelastic parameters [20].…”

Section: Resultsmentioning

confidence: 66%

Formation of Polyelectrolyte Complexes from Chitosan and Alkaline Gelatin

Nicolay

Nina

Kuchina

et al. 2020

KLS

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The interaction of chitosan and alkaline gelatin biopolymers in formation of polyelectrolyte complexes has been studied by the Fourier IR spectroscopy and scanning electron microscopy. Also the influence of chitosan on the morphology of gelatin hydrogels has been observed. It has been shown that in the range of chitosan (C)/gelatin (G) (w/w) ratio Z = g= gC/gG from 0.1 to 1.5, chitosan–gelatin complexes are formed due to electrostatic interactions of charges amino-groups of chitosan and carboxylic groups of gelatin as well as due to intermolecular hydrogen bonds. In this case, the share of collagen-like triple helices in the spatial network of hydrogel decreases. The formation of chitosan–gelatin complexes leads to the qualitative changes in the hydrogel morphology even at low ratios of biopolymer (at Z = 0.025 gC/gG). The fiber-like structure of gelatin gels transforms and less structured but denser zones appear in the gel network.

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Section: Resultsmentioning

confidence: 66%

Formation of Polyelectrolyte Complexes from Chitosan and Alkaline Gelatin

Nicolay

Nina

Kuchina

et al. 2020

KLS

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“…This can be explained by a possible interaction between gelatin and carrageenan, which is suspected to be a polyelectrolyte complex formation. This non-covalent interaction has already been reported and is widely described [6,[12][13][14][15][16]. Even though carrageenan is present in the film in a small amount, it still can significantly impact the viscosity of the gel phase.…”

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confidence: 67%

Prototype Gastro-Resistant Soft Gelatin Films and Capsules—Imaging and Performance In Vitro

et al. 2020

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The following study is a continuation of the previous work on preparation of gastro-resistant films by incorporation of cellulose acetate phthalate (CAP) into the soft gelatin film. An extended investigation on the previously described binary Gelatin-CAP and ternary Gelatin-CAP-carrageenan polymer films was performed. The results suggest that the critical feature behind formation of the acid-resistant films is a spinodal decomposition in the film-forming mixture. In the obtained films, upon submersion in an acidic medium, gelatin swells and dissolves, exposing a CAP-based acid-insoluble skeleton, partially coated by a residue of other ingredients. The dissolution-hindering effect appears to be stronger when iota-carrageenan is added to the film-forming mixture. The drug release study performed in enhancer cells confirmed that diclofenac sodium is not released in the acidic medium, however, at pH 6.8 the drug release occurs. The capsules prepared with a simple lab-scale process appear to be resistant to disintegration of the shell structure in acid, although imperfections of the sealing have been noticed.

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“…Due to the hydrophilic and swelling properties, KC can be used as gelling agent . It is commonly found that a KC concentration of about 1 wt% is sufficient to allow gelation upon cooling . Although KC is a strong hydrophilic, only a minimal amount is needed for gel formation, so its effect to cause incompatibility with other blended polymers is probably negligible .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of nanoclay gel composite: A novel nanoclay masterbatch approach to nanocomposite preparation via melt extrusion process

Luecha

Magaraphan

2018

Polymer Composites

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The objective of this research was to fabricate a novel nanoclay masterbatch containing polymer‐intercalated in nanoclay with comparable degree of interlayer expansion, flowability, and high thermal stability. It is ready to use for preparing polymer/clay nanocomposites by melt extrusion. The nanoclay masterbatch was efficiently prepared in one‐step via a new approach called nanoclay gel. The nanoclay gels were successfully prepared at different original nanoclay concentrations ranging from low to high clay loading (10%, 20%, and 30% w/v) in cooperation with polyethylene glycol (PEG) at various PEG loadings (weight ratios of nanoclay/PEG 1/1, ½, and 1/3) and kappa carrageenan (KC), a thermolytic hydrogel at a fixed minimum concentration. X‐ray diffraction (XRD) results revealed that the intercalation of PEG molecules expanded silicate basal spacing up to 17–18 A° even at high percentage of nanoclay (dry content about 24–49 wt%). Scanning electron microscope (SEM) revealed the denser packing of clay layers in accordance to an increase in density of the dry nanoclay gel with increment of original nanoclay loadings. An increase of PEG content exhibited better flow ability as seen by increasing melt flow index. Thermal decomposition of the nanoclay gels was up to 380°C; by using the dry nanoclay gels to prepare polystyrene (PS)/clay nanocomposites via melt extrusion. The morphological results showed that the exfoliated structures were achieved. The mechanical and thermal stability properties were significantly enhanced. The appearing color of PS/clay nanocomposites prepared from nanoclay gel was bright pale‐yellow without evidence of thermal degradation. POLYM. COMPOS., 40:2751–2767, 2019. © 2018 Society of Plastics Engineers

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The rheology of gelatin hydrogels modified by κ-carrageenan

Cited by 145 publications

References 35 publications

Formation of Polyelectrolyte Complexes from Chitosan and Alkaline Gelatin

Formation of Polyelectrolyte Complexes from Chitosan and Alkaline Gelatin

Prototype Gastro-Resistant Soft Gelatin Films and Capsules—Imaging and Performance In Vitro

Fabrication of nanoclay gel composite: A novel nanoclay masterbatch approach to nanocomposite preparation via melt extrusion process

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