Surface active properties of chitosan and its derivatives

Elsabeé, Maher Z.; Morsi, Rania E.; Al‐Sabagh, A. M.

doi:10.1016/j.colsurfb.2009.06.021

Cited by 145 publications

(98 citation statements)

References 103 publications

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“…With respect to cellulose based systems, studies of interfacial properties of chitosan surfactant mixtures are more limited 161,162,[167][168][169][170][171][172][173] and were recently reviewied. 171 In the literature contradicting results on the surface activity of chitosan solutions can be found: while some authors state that chitosan itself shows no surface activity%, 161,168,169,174 or report even an increase in surface tension up to 84 mN m À1 for 1% of 1.88 MDa chitosan in a 0.1 M acetic acid solution at 25 C, 174 on the contrary, other authors report a strong decrease in surface tension also for dilute chitosan solutions (C p ca.…”

Section: Interfacial Aspectsmentioning

confidence: 99%

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

2013

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We review the work done on complexes between biopolyelectrolytes such as ionically modified cellulose or chitosan and oppositely charged surfactants. Around equimolarity of the charges one typically observes precipitation but for other mixing ratios one may form long-time stable complexes, where structure and rheology depend on the mixing ratio, total concentration and the molecular constitution of the components. In addition, it may be the case that the structures are formed under non-equilibrium situations and therefore depend on the preparation path. The binding is shown to occur cooperatively and the micelles present often retain their shape irrespective of the complexation. However, the rather stiff biopolyelectrolytes may lead to an interconnection between different aggregates thereby forming a network with the corresponding rheological properties. In general, the structure and the properties of the aggregates are rather versatile and correspondingly one can create a wide range of different surfactant-biopolyelectrolyte systems by appropriately choosing the composition. This is very interesting as it allows for formulations with a large range of tuneable properties with ecologically friendly polyelectrolytes for many relevant applications.

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Section: Interfacial Aspectsmentioning

confidence: 99%

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

2013

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“…At pH > 6.5 chitosan solutions exhibit phase separation, while at pH < 6.5 chitosan is soluble, carrying a positive charge because of the presence of protonated amino groups [67]. At pH between 6.0 and 6.5 in solution, the free amino groups of chitosan molecules become less protonated and hydrophobicity along the chitosan chain increases.…”

Section: Influence Of Phmentioning

confidence: 99%

“…The chitosan concentration should also be controlled when chitosan is used as a surfactant [67]. The concentration above which a surfactant starts to form micelles or aggregates is called the critical micelle concentration (CMC) or the critical aggregate concentration (CAC), and the determination of this value for chitin/chitosan-based products is very important [67,96].…”

Section: Influence Of Concentrationmentioning

confidence: 99%

“…The concentration above which a surfactant starts to form micelles or aggregates is called the critical micelle concentration (CMC) or the critical aggregate concentration (CAC), and the determination of this value for chitin/chitosan-based products is very important [67,96]. The initial concentration of chitin also has an important effect on the syneresis of chitin gels [77].…”

Section: Influence Of Concentrationmentioning

confidence: 99%

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Biomedical Activity of Chitin/Chitosan Based Materials—Influence of Physicochemical Properties Apart from Molecular Weight and Degree of N-Acetylation

et al. 2011

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Abstract:The physicochemical nature of chitin and chitosan, which influences the biomedical activity of these compounds, is strongly related to the source of chitin and the conditions of the chitin/chitosan production process. Apart from widely described key factors such as weight-averaged molecular weight (M W ) and degree of N-acetylation (DA), other physicochemical parameters like polydispersity (M W /M N ), crystallinity or the pattern of acetylation (P A ) have to be taken into consideration. From the biological point of view, these parameters affect a very important factor-the solubility of chitin and chitosan in water and organic solvents. The physicochemical properties of chitosan solutions can be controlled by manipulating solution conditions (temperature, pH, ionic strength, concentration, solvent). The degree of substitution of the hydroxyl and the amino groups or the degree of quaternization of the amino groups also influence the mechanical and biological properties of chitosan samples. Finally, a considerable research effort has been directed towards developing safe and efficient chitin/chitosan-based products because many factors, like the size of nanoparticles, can determine the biomedical characteristics of medicinal products. The influence of these factors on the biomedical activity of chitin/chitosan-based products is presented in this report in more detail. OPEN ACCESSPolymers 2011, 3 1876

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“…It is also non-toxic, biocompatible, and, importantly, biodegradable, in addition to possessing some antimicrobial activity [19][20][21]. To improve the physical and biological properties, as well as widen the range of potential applications, versatile chitosan derivatives have been synthesised [22]. Amphiphilic derivatives are especially interesting, due to the presence of a hydrophobic molecules in the chitosan structure, which can modify the rheological behaviour, resulting in self-assembly ability [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Friction behaviour of hydrophilic lubricious coatings for medical device applications

Niemczyk

Fray

Franklin

2015

Tribology International

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The friction behaviour of new chitosan derivative coatings obtained by chemical modification of chitosan with fatty acids (linoleic and dilinoleic acid) has been investigated in order to explore their potential as endovascular catheter coatings and to benchmark them against commercially available coatings used in endovascular catheter applications. An in vitro tribological system was developed that was intended to represent to a limited extent the in vivo tribological conditions of a typical endovascular catheterization procedure. Continuous reciprocating sliding tests were carried out with uncoated and coated polymer specimens. The results showed that all of the coatings tested decreased the coefficient of friction compared to the uncoated polymer. Compared to a neat chitosan coating, the chitosan derivative coatings showed a clear reduction in the coefficient of friction to levels similar to those of the commercially-available coatings. A comparison between the friction results and contact angle measurements carried out on the coatings indicated that a range of contact angle values exists for which the friction coefficient is at a minimum. The reason for this is unclear and further studies are required in order to confirm and investigate the trend, especially within the context of hydrophilic lubricious coating development.

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Surface active properties of chitosan and its derivatives

Cited by 145 publications

References 103 publications

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

Biomedical Activity of Chitin/Chitosan Based Materials—Influence of Physicochemical Properties Apart from Molecular Weight and Degree of N-Acetylation

Friction behaviour of hydrophilic lubricious coatings for medical device applications

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