Ionic conductivity of chitosan membranes

Wan, Ying; Creber, Katherine A. M.; Peppley, Brant A.; Bui, V. T.

doi:10.1016/s0032-3861(02)00881-9

Cited by 274 publications

(172 citation statements)

References 23 publications

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“…In both chitin and chitosan, the monomer units are linked through b-D-(1-4)-glycosidic bonds. Owing to the abundance of free amine groups on chitosan, it is both reactive ( Yi et al 2005; importantly it undergoes phosphorylation, Wan et al 2003) and soluble as a function of pH. As such, chitosan-nHA composites have been identified as potential candidate materials for various biomedical applications including scaffolds for mineralized tissue repair.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-mediated crystallization and assembly of hydroxyapatite nanoparticles into hybrid nanostructured films

Kumar

Prakash

Cheang

et al. 2007

J. R. Soc. Interface.

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The synthesis and subsequent assembly of nearly spherical nano-hydroxyapatite (nHA) particles in the presence of trace amounts of the polysaccharide chitosan was carried out employing a wet chemical approach. Chitosan addition during synthesis not only modulated HA crystallization but also aided in the assembly of nHA particles onto itself. Solvent extraction from these suspensions formed iridescent films, of which the bottom few layers were rich in self-assembled nHA particle arrays. The cross-section of these hybrid films revealed compositional and hence structural grading of the two phases and exhibited a unique morphology in which assembled nHA particles gradually gave way to chitosan-rich top layers. Transmission electron microscope and selected area electron diffraction studies suggested that the basal plane of HA had interacted with chitosan, and scanning electron microscope studies of the hybrid films revealed multi-length scale hierarchical architecture composed of HA and chitosan. Phase identification was carried out by X-ray diffraction (XRD) and Rietveld analysis of digitized XRD data showed that the basic apatite structure was preserved, but chitosan inclusion induced subtle changes to the HA unit cell. The refinement of crystallite shape using the Popa method clearly indicated a distinct change in the growth direction of HA crystallites from [001] to [100] with increasing chitosan concentration. The paper also discusses the likelihood of chitosan phosphorylation during synthesis, which we believe to be a pathway, by which chitosan molecules chemically interact with calcium phosphate precursor compounds and orchestrate the crystallization of nHA particles. Additionally, the paper suggests several interesting biomedical applications for graded nHA-chitosan nanostructured films.

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Section: Introductionmentioning

confidence: 99%

Chitosan-mediated crystallization and assembly of hydroxyapatite nanoparticles into hybrid nanostructured films

Kumar

Prakash

Cheang

et al. 2007

J. R. Soc. Interface.

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“…The degree of deacetylation (DDA) obtained from this study when deacetylation repeated twice was ranged from 88.62 to 97.63 %, where the highest value of DDA was obtained by deacetylation twice with the aid of heat treatment at 80 o C. These results showed that the heating treatment on the deacetylation process affects significantly the deacetylation of chitin to produce better quality of chitosan with higher DDA value. Previous study done by Wan et al (2003) reported that the chitosan obtained highest DDA value 95.1% when performing deacetylation twice but the process was performed in a reactor at 100 o C using 50 % NaOH for 1 hour treatment. Another study which also conducted deacetylation twice is done by Zhou et al (2008) and managed to produce chitosan with DDA value 90.3 % by performing with 50% NaOH at 100 o C for 30 minutes.…”

Section: Degree Of Deacetylation (Dda)mentioning

confidence: 99%

“…The deacetylation process was done with a modification by Miya et al (1985) and Wan et al (2003) by soaking the dried chitin prepared with 48% NaOH for 48 hours at room temperature (~25 o C). After soaking, the product is known as chitosan (Kumari and Rath, 2014).…”

Section: Soaking Frequencymentioning

confidence: 99%

Optimization of shrimp shell waste deacetylation for chitosan production

Ahing¹,

Wid

2016

Int. j. adv. appl. sci

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Chitosan, a versatile natural polymer is an amino polysaccharide prepared by processing shrimp shell waste which involved deacetylation of chitin. To obtain high degree of deacetylation (DDA), several parameters should be performed during alkaline treatment. The present study was undertaken at different time of soaking treatment (once and twice) and temperature (60 o C and 80 o C) to optimize the deacetylation process to produce chitosan with high solubility and degree of deacetylation. It was observed that the highest solubility and degree of deacetylation were obtained when deacetylation process was repeated twice and temperature of 80 o C, with 99.48% and 97.63%, respectively. It can be concluded that by repeating the deacetylation twice with the support of heating treatment, a better quality of chitosan with higher solubility and degree of deacetylation can be produced.

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“…Wan et al [53] studied the ionic conductivity of chitosan electrolytes with different molecular weights and degree of deacetylation. They have proposed that chitosan can be used as electrolyte material for alkaline fuel cells.…”

Section: Biological Activities and Application Of Marine Polysaccharidesmentioning

confidence: 99%

Chitosan and Phthaloylated Chitosan in Electrochemical Devices

Osman¹,

Arof²

2017

Biological Activities and Application of Marine Polysaccharides

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Chitin and chitosan are widely found in nature. Chitin can be obtained from fungi and in the lower animals. Chitosan can be derived from chitin. The process of chitosan derivation from chitin is called deacetylation. Chitosan is non-toxic, odourless, biocompatible in animal tissues and enzymatically biodegradable. It has found many applications in the fields of cosmetics, wound healing, dietetics and waste-water treatment. Chitosan holds many promising potentials, but its inability to dissolve in many of the common solvents has restricted its application. Hence, chitosan has been modified, and there are now many derivatives of chitosan. In the current chapter, we discuss chitosan and only the phthaloyl chitosan derivative. Their applications in several electrochemical devices are also discussed.

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Ionic conductivity of chitosan membranes

Cited by 274 publications

References 23 publications

Chitosan-mediated crystallization and assembly of hydroxyapatite nanoparticles into hybrid nanostructured films

Chitosan-mediated crystallization and assembly of hydroxyapatite nanoparticles into hybrid nanostructured films

Optimization of shrimp shell waste deacetylation for chitosan production

Chitosan and Phthaloylated Chitosan in Electrochemical Devices

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