Preparation of chitosan gel

Moussaoui, Younes; Mnasri, Najib; Elaloui, Elimame; Salem, Ridha Ben; Lagerge, Serge; Menorval, L. C. De

doi:10.1051/epjconf/20122900034

Cited by 11 publications

(7 citation statements)

References 29 publications

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“…The PECs produced at the higher pH range (pH 9-12), contained approximately 30% more CS than PECs produced at the lower pH range (pH 3-8). The moisture contents of PECs prepared at higher pHs (range 9-12) were approximately eight times larger than the moisture contents present in PECs prepared at lower pH range (3)(4)(5)(6)(7). The FTIR spectra were used to confirm the electrostatic interaction during PEC formation ( figure 4(b)).…”

Section: Resultsmentioning

confidence: 99%

“…The low costs are due to the abundance of waste shrimp shells and farmed red seaweed and their relatively simple extraction methods [4]. CS, a positively-charged polysaccharide is widely considered as the second most abundant organic material after cellulose [5]. CS possesses appealing intrinsic properties such as being biodegradable [6] and bacteriostatic [7].…”

Section: Introductionmentioning

confidence: 99%

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Effects of reaction pH on self-crosslinked chitosan-carrageenan polyelectrolyte complex gels and sponges

2018

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Macromolecular biomaterials often require covalent crosslinking to achieve adequate stability for their given application. However, the use of auxiliary chemicals may be associated with long-term toxicity in the body. Oppositely-charged polyelectrolytes (PEs) have the advantage that they can selfcrosslink electrostatically and those derived from marine organisms such as chitosan (CS) and carrageenan (CRG) are inexpensive non-toxic alternatives to glycosaminoglycans present in the extracellular matrix of human tissues. The aim of this study was to explore the properties of crosslinker-free PEC gels and freeze-dried PEC sponges based on CS and CRG precursors. We offer new insights into the optimisation of conditions and mechanisms involved in the process and offer a systematic study of property changes across a full range of pH values. Zeta-potential measurements indicated that the PECs produced at pH 2-6 had a high strength of electrostatic interaction with the highest being at pH 4-5. This resulted in strong intra-crosslinking in the PEC gels which led to the formation of higher yield, viscosity, fibre content and lower moisture content. The weaker interaction between CS and CRG at pH 7-12 resulted in higher levels of CS incorporated into the complex and the formation of more inter-crosslinking through entanglements and secondary interactions between PEC units. This resulted in the production of stable PEC sponge materials compared with the PEC materials produced at pH 6 and below. From the range of samples tested, the PECs produced at pH 7.4 appeared to show the optimum combination of yield, stability and homogeneity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of reaction pH on self-crosslinked chitosan-carrageenan polyelectrolyte complex gels and sponges

2018

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“…Some studies reported ambient/ vacuum-drying of chitosan xerogels,but only as acomparative method to supercritical or freeze-drying,a nd most of the resulting materials had low surface areas. [111,180] 3. Process-Structure-Property Relations Tables S1-S5 provide an overview of the physical properties (density,p orosity,s pecific surface area, pore volume, compression elastic modulus) and categories of microstructure from SEM images (macroporous/mesoporous,c ellular/ fibrous/particulate) of chitosan aerogels reported in the literature.I nt his section, we extract general trends between processing (gelation, drying) and structural properties for pure chitosan systems (Table S1).…”

Section: Evaporative Dryingmentioning

confidence: 99%

Chemistry of Chitosan Aerogels: Three‐Dimensional Pore Control for Tailored Applications

et al. 2020

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Chitosan is an abundant biopolymer derived from food waste with attractive properties, particularly its high biocompatibility and easy chemical processability. Here, we review the rapidly expanding literature on chitosan‐based porous materials with a focus on the gelation mechanisms, the three‐dimensional multiscale structural control, and the diverse chemical functionality not accessible by other biopolymers. The properties vary widely: from supercritically dried, mesoporous chitosan aerogels to very light, freeze‐dried macroporous scaffolds. Porous chitosan displays impressive performance at the laboratory scale, but the highly (meso)porous nature amplifies not only the beneficial functionality of chitosan, but also its drawbacks, resulting in serious barriers to industrialization. In order to facilitate technology transfer, we critically discuss the practical feasibility of chitosan aerogels in potential applications compared to conventional and other biopolymer‐based porous or nonporous materials.

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“…Einige Studien beschrieben die Umgebungs-/Vakuumtrocknung von Chitosan-Xerogelen, allerdings lediglich als ein Vergleichsverfahren zur überkritischen Trocknung oder Gefriertrocknung,u nd die meisten der resultierenden Materialien zeigten kleine Oberflächen. [111,180]…”

Section: Verdunstungstrocknungunclassified

Chemie der Chitosan‐Aerogele: Lenkung der dreidimensionalen Poren für maßgeschneiderte Anwendungen

et al. 2020

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Indiesem Aufsatz diskutieren wir die schnell wachsende Zahl an Literaturbeiträgen zu Chitosan-basierten porçsen Materialien, mit Schwerpunkt auf Gelierungsmechanismen, dreidimensionaler multiskaliger Strukturkontrolle sowie der mannigfaltigen chemischen Funktionalität, die mit anderen Biopolymeren nicht erreichbar ist. Die Eigenschaften unterscheiden sich von letzteren teils stark:v on überkritischg etrockneten, mesoporçsen Chitosan-Aerogelen bis hin zu äußerst leichten, gefriergetrockneten makroporçsen Gerüsten. Im Labormaßstab erreicht porçses Chitosan beeindruckende Eigenschaften, der hoch(meso)porçse Charakter verstärkt jedoch nicht nur die vorteilhafte Funktionalitätdes Chitosans,sondern auchseine Nachteile,was eine mçgliche Industrialisierung ernsthaft einschränkt. Zur Fçrderung des Technologietransfers diskutieren wir in kritischer Weise die praktische Umsetzbarkeit mçglicher Anwendungen von Chitosan-Aerogelen im Vergleich zu konventionellen und anderen biopolymerbasierten porçsen oder nichtporçsen Materialien. Aus dem Inhalt 1. Einleitung 9914 2. Synthese von Chitosan-Aerogelen 9916 3. Prozess-Struktur-Eigenschafts-Beziehungen 9920 4. Oberflächenchemie und Funktionalisierung 9925 5. Anwendungen 9927 6. Zusammenfassung und Ausblick: auf dem Wegz ur Industrialisierung 9932

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Preparation of chitosan gel

Cited by 11 publications

References 29 publications

Effects of reaction pH on self-crosslinked chitosan-carrageenan polyelectrolyte complex gels and sponges

Effects of reaction pH on self-crosslinked chitosan-carrageenan polyelectrolyte complex gels and sponges

Chemistry of Chitosan Aerogels: Three‐Dimensional Pore Control for Tailored Applications

Chemie der Chitosan‐Aerogele: Lenkung der dreidimensionalen Poren für maßgeschneiderte Anwendungen

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