Synthesis and properties of chitosan hydrogels modified with heterocycles

Kandile, Nadia G.; Mohamed, Mohamed Bakr; Zaky, Howida T.; Nasr, Abir S.; Abdel‐Bary, E. M.

doi:10.1016/j.carbpol.2008.08.024

Cited by 17 publications

(4 citation statements)

References 14 publications

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“…At higher temperatures, the chitosan derivative exhibited slower weight loss than did chitosan. The results indicated that cross-linked chitosan formed a network that rendered it more thermally stable [32] , [33] , [34] .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of a new chitosan derivative and assay of Escherichia coli adsorption

Shang

Sha

Liu

et al. 2011

Journal of Pharmaceutical Analysis

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A new chitosan derivative is prepared using chitosan. Ethyl cholorocarbonate was first introduced to the hydroxyl group of phthaloylchitosan through a nucleophilic reaction. Hydrazine was then added to recover the amino groups of chitosan, and promote cross-linking. The structure of this new chitosan derivative was characterized by Fourier transform infrared (FT-IR) and proton nuclear magnetic resonance (1H NMR) spectroscopy, and its physical properties were determined by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The thermal and chemical stabilities of the new derivative were improved compared with those of native chitosan. Assay of Escherichia coli adhesion on a film based on this chitosan derivative showed good adsorption and biofilm formation.

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Section: Resultsmentioning

confidence: 99%

Synthesis of a new chitosan derivative and assay of Escherichia coli adsorption

Shang

Sha

Liu

et al. 2011

Journal of Pharmaceutical Analysis

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“…In continuation to our program for the synthesis of different polymers, 19,20 the aim of the present work in this article was the synthesis of PAs and PEAs having hydrazo functionality in the main polymer chain by thermal polycondensation reactions of different diamines with different diacids. The synthesized new PA (3 a-h ) and PEAs (4 a-b ) were studied using elemental analysis, FTIR, 1 H-NMR, solubility, X-ray, thermal analysis, mechanical properties, and electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

New polyamides and polyesteramides incorporated with bis(carboxy‐substituted) hydrazines: Synthesis and characterization

Kandile

Nasr

2011

J of Applied Polymer Sci

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The present article endeavors to synthesize new polyamides via direct polycondensation of various diamines [hexamethylene diamine, q-phenylene diamine, 2,5-bis(m-aminobenzylidene) cyclopentanone, and 2,6-bis (m-aminobenzylidene)cyclohexanone] with different bis (carboxy-substituted) hydrazines such as [1,2-bis(3-carboxy acrylyl)hydrazine and 1,2-bis(3-carboxybenzoyl) hydrazine]. The polycondensation reaction of 1,2-bis(3-p-hydroxyanilide acrylyl) hydrazine with the same bis(carboxysubstituted) hydrazines gave polyester amides. The polycondensation process was run in the presence of CaCl 2 , triethylphosphite, and pyridine as a catalyst. These polymers were characterized by FTIR, 1 H-NMR, solubility, TGA, DSC, X-ray, mechanical properties, and electrical conductivity. The electrical conductivity measurements showed that all new polymers show promise as insulators.

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“…Both policaju and chitosan have already been reported on the literature as potential materials to form hydrogels; however, most studies promote chemical/structural modifications with the addition of active radicals (carboxyl or amino groups), or through different types of chemical crosslinks and physical interactions [23][24][25][26][27]. Nevertheless the use of unmodified policaju, in combination with chitosan, as a potential material to form hydrogel has not been widely explored in the literature [15,[27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of hydrogels based on natural polysaccharides: Policaju and chitosan

Soares

Bourbon

Vicente

et al. 2014

Materials Science and Engineering: C

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The development of hydrogels based on natural polysaccharides was investigated by preparing mixtures of policaju/chitosan at weight ratios of 1:4 and 2:3. Utilizing dynamic light scattering (DLS) techniques for these mixtures, an increase on the hydrodynamic particle radius was observed varying their pH from 3.0 to 12.0. Furthermore, a reduction of ζ-potential was also observed for the same pH interval. Following rounds of drying/hydration cycles at a specific pH value, hydrogel matrices were formed. The pore size distribution of these formed hydrogels was examined using scanning electron microscopy. Further FT-IR analyses confirmed a physical interaction between the polysaccharides policaju and chitosan. Swelling experiments revealed water uptake values, after 24h of immersion in water, close to 270% for 1:4, and 320% for 2:3 hydrogels. Finally, rheological measurements were then conducted in order to confirm hydrogel viscoelastic features. These results indicate a promising road to biomaterials fabrication and biomedical applications.

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Synthesis and properties of chitosan hydrogels modified with heterocycles

Cited by 17 publications

References 14 publications

Synthesis of a new chitosan derivative and assay of Escherichia coli adsorption

Synthesis of a new chitosan derivative and assay of Escherichia coli adsorption

New polyamides and polyesteramides incorporated with bis(carboxy‐substituted) hydrazines: Synthesis and characterization

Development and characterization of hydrogels based on natural polysaccharides: Policaju and chitosan

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