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Subject: search.filters.subject.Chitosan

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    Synthesis and rheological properties of magnetic chitosan hydrogel
    (Budapest University of Technology and Economics, 2021) Ikhaddalene, Soumia; Zibouche, Fatima; Ponton, Alain; Irekti, Amar; Carn, Florent
    The aim of the present work is first to synthesis a magnetic chitosan hydrogel (chitosan ferrogel) using the blending method and second to study it rheological behavior. Magnetic components ( maghemite particles γ-Fe 2 O  ) were synthesized via a simple chemical co-precipitation route also called Massart's procedure. Before being dispersed in chitosan network, γ-Fe 3 2 O particles were covered with a cationic polyelectrolyte (Polydiallyldimethylammonium chloride; PDADMAC) and the exact quantity required to cover the entire surface of maghemite particles was determined by Electrophoretic mobility. The successful functionalization of maghemite particles was confirmed by zeta potential measurement. The prepared ferrogel was gelified using glyoxal as crosslinking agent. The effect of continuous magnetic field on rheological properties of the elaborated ferrogel was studied, under controlled temperature before and after the gelation process, using a rotating rheometer fitted with a new magneto-rheological cell. Moreover the influence of iron oxide content on the gelation time of magnetic hydrogel was studied by comparing two ferrogels with different maghemite particles content. Flow and viscoelastic measurements showed that applying magnetic field facilitates the formation of a new structure (columnlike arrangements), which was confirmed by in situ optical microscopic observation. Kinetic study was investigated by mechanical spectroscopy and demonstrates that the gelation time depends on both iron oxides content and magnetic field
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    Preparation and characterization of biocomposites based on chitosan and biomimetic hydroxyapatite derived from natural phosphate rocks
    (Elsevier, 2021) Brahimi, Salim; Ressler, Antonia; Boumchedda, Khaled; Hamidouche, Mohamed; Kenzour, Abdeghani; Djafar, Rabah; Antunović, Antunovic; Bauer, Leonard; Hvizdoš, Pavol; Ivanković, Hrvoje
    Highly porous chitosan/hydroxyapatite (CS/HA) biocomposite scaffolds were prepared using the freeze-gelation method. A starting biomimetic HA powder was synthesized by a wet precipitation method using an abundant natural phosphate (NP) ore as raw material. Then, CS/HA scaffolds with different weight ratios (100/0; 90/10; 80/20; 70/30) have been prepared. The used powders and synthesized scaffolds were characterized by XRF, ICP-MS, FTIR, TG-DSC, XRD, SEM, and cell viability. The results showed that the precipitated raw powder was mainly composed of HA and amorphous calcium phosphate (ACP) with some traces of Mg2+, SiO42−, Sr2+, Na+ and Fe2+ ions which were usually found in such mineral NP precursors. The heat treatment of the raw powder at more than 750 °C leads to the formation of Mg-substituted β-tricalcium phosphate (β-TCMP). Moreover, the culture of human embryonic kidney cells indicated the non-cytotoxicity of the as-prepared powder. On the other hand, the elaborated CS/HA scaffolds exhibited a highly porous structure with well-interconnected pores and homogeneously dispersed HA particles. The measurement of swelling capacity under physiological conditions revealed that the addition of HA to the CS matrix effectively decreased the swelling percentage. The obtained results suggest that the elaborated CS/HA composites may have effective potential as biocompatible scaffolding materials for bone tissue engineering
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    Kinetic and equilibrium studies of salicylic acid adsorption from contaminated water by (alginate/chitosan/cobalt ferrite) nanocomposites
    (Aljest, 2019) Aroun, I.; Bensacia, N.; Seffah, K.; Benyahia, S.
    The main objective of this study is the synthesis of the (Alginate / Chitosan/ Cobalt ferrite) nanocomposites. The asdsorbent was characterized via Fourrier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (DRX) and zeta potential. The adsorption tests of salicylic acid on the (Alginate / chitosan / cobalt ferrite) adsorbent were carried out at a temperature of 25°C, pH equal to 4, a mass of 10 mg and a concentration of 10 mg /L. Under these conditions, the adsorption capacity was found to be of the order of 10 mg /g, which corresponds to an equilibrium time of 90 min. The kinetics of adsorption is correctly written by the kinetic model of the pseudo second order. The adsorption data were fitted using the Langmuir and Freundlich isotherms, and the obtained modeling equilibrium adsorption data suggested that the (Alginate / Chitosan/ Cobalt ferrite) nanocomposites sample contained homogeneous adsorption sites that fit the Langmuir adsorption model well
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    XPS analysis of chitosan-hydroxyapatite biomaterials : from elements to compounds
    (John Wiley & Sons, 2013) Maachou, H.; Genet, Michel J.; Aliouche, Djamel; Dupont-Gillain, Christine C.; Rouxhet, Paul G.
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    Characterization and In vitro bioactivity of chitosan/hydroxyapatite composite membrane prepared by freeze-gelation method
    (2008) Maachoua, H.; Bal, K.E.; Bal, Y.; Chagnesd, A.; Cote, G.; Alliouche, D.
    This work reports the properties of highly porous (>80%) membrane Chitosan/Hydroxyapatite (Cs/HA) composites obtained by the freeze-gelation processing route. These materials are of great interest for bone regeneration applications due to their ability to nucleate calcium phosphates in presence of simulated body fluid (SBF). The membranes porosity and bioactivity can be easily controlled by adding various amounts of hydroxyapatite to chitosan solution. The structural properties of the composite membrane of Cs/HA at various weight ratio (Cs/HA=70/30, 50/50 and 30/70) have been investigated by scanning electron microscopy (SEM), porosity measurements and FTIR spectroscopy. The surface of the composite membranes after immersion in SBF during more than 14 days shows a regular Ca-P layer as evidenced by FTIR spectroscopy and ICP analysis. These results suggest the potential interest of the Chitosan/hydroxyapatite composite membranes prepared by freeze-gelation process in bone regeneration and especially of the Cs/HA membrane with a ratio of 70/30