Studies of the association of chitosan and alkylated chitosan with oppositely charged sodium dodecyl sulfate

Onésippe, Cristel; Lagerge, Serge

doi:10.1016/j.colsurfa.2008.07.054

Cited by 42 publications

(26 citation statements)

References 19 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%

“…When chitosan is added to oppositely charged surfactant solutions, in most cases SDS, a lower surface tension with respect to the pure tenside solution is observed, with this effect being stronger for hydrophobically modied chitosan. 167,168 This effect is explained by the formation of highly surface active SPECs, which form already at very low surfactant concentrations, where SDS alone shows no decrease of surface tension.…”

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confidence: 99%

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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%

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confidence: 99%

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

2013

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“…Chitosan is the most abundant natural polysaccharide after cellulose and hemicelluloses (González-Campos et al 2009;Onesippe and Lagerge 2008;Singh et al 2009). It is a semicrystalline polysaccharide that contains a considerable amorphous fraction (Mathew et al 2009) and has T g values from 30 to 222 °C (González-Campos et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Chitosan/Corn Cob Biocomposite Films by Cross-linking with Glutaraldehyde

2013

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Corn cob (CC) was used as a filler in chitosan (CS) biopolymer films. The effect of glutaraldehyde (GLA) as a crosslinking agent was studied in an effort to improve the properties of CS/CC biocomposite films prepared via solvent casting. The tensile strength and elongation at break values decreased, but the modulus of elasticity increased with CC content. However, the tensile properties of CS/CC biocomposite films improved when modified with GLA. The Fourier transform infrared (FTIR) results indicated the presence of imine bonds (C=N) and ethylenic groups due to the cross-linking reaction between CS and GLA. The thermal stability of CS/CC biocomposite films reduced with increasing CC content. The modification of CS/CC with GLA enhanced the thermal stability of the biocomposite films. Moreover, the wettability and adhesion of the CC-CS system were enhanced by modification with GLA, as demonstrated by a morphological study. The crosslinking agent glutaraldehyde positively affected the tensile strength, modulus of elasticity, and thermal stability of the biocomposite films.

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“…The choice of 12C insertion was based in the availability of lauric acid derivatives and the absence of other chemical groups in the chain as hydroxyl or double bonds, such as in 16C (palmitoleic, one double bond), 18C (oleic, one double bond), 18C ricinoleic (one double bond and one hydroxyl group) acid derivatives, that could interfere in the analysis of the final grafted chitosan chains. This approach has been followed before but not in a systematic way and generally aimed to use the acetylated product for further reactions such as esterification and adsorption of heavy metals, 24 or to study the rheological, 25 interfacial and electrical, 26 properties of the substituted materials. [18][19][20][21][22][23][24][25][26][27][28][29] The analytical method employed for the quantitative determination of the degree of insertion (DI) of ramifications in the resultant grafted polymer, was based on FTIR band correlation.…”

Section: Introductionmentioning

confidence: 99%

“…This approach has been followed before but not in a systematic way and generally aimed to use the acetylated product for further reactions such as esterification and adsorption of heavy metals, 24 or to study the rheological, 25 interfacial and electrical, 26 properties of the substituted materials. [18][19][20][21][22][23][24][25][26][27][28][29] The analytical method employed for the quantitative determination of the degree of insertion (DI) of ramifications in the resultant grafted polymer, was based on FTIR band correlation. A similar procedure has been used by other authors, 25,30 but only aiming to quantify the degree of acetylation of chitosan, which is the acetyl content that remained in chitin after deacetylation.…”

Section: Introductionmentioning

confidence: 99%

Grafting ofchitosan with fatty acyl derivatives

Chiandotti¹,

Rodrigues²,

Akcelrud³

2010

J. Braz. Chem. Soc.

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A plastificação interna da quitosana pela inserção covalente de longas ramificações alifáticas, tipicamente 12C, foi conduzida por meio da reação de condensação entre os grupamentos amino da quitosana com os derivados ácidos do ácido láurico, como anidrido ou cloreto de lauroíla que são mais reativos do que o ácido correspondente. A rota química possibilitou a N-acilação seletivamente. O grau de substituição, determinado quatitativamente por FTIR e 1 H NMR, variou entre 3 e 35%. A análise quantitativa por FTIR baseou-se em um método de calibração que forneceu boa precisão nos resultados. A quitosana modificada mostrou-se solúvel em água neutra e/ou DMF conforme o grau de substituição.The internal plasticization of chitosan with covalently linked long aliphatic branches, typically 12C, was accomplished through the condensation of the amino groups of chitosan with acidic derivatives of lauric acid, as lauroyl anhydride or lauroyl chloride, that are more reactive than the fatty acid itself. The chemical pathway led to selective N-acylation. The degree of substitution was quantitatively determined by FTIR and 1 H NMR and varied between 3 and 35%. The FTIR quantitative analysis was based in a calibration mmethod with good accuracy. The modified chitosan products were soluble in neutral water and/or DMF according to the degree of substitution. The modified chitosan films were more flexible than the pristine, non-modified ones.

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Studies of the association of chitosan and alkylated chitosan with oppositely charged sodium dodecyl sulfate

Cited by 42 publications

References 19 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

Chitosan/Corn Cob Biocomposite Films by Cross-linking with Glutaraldehyde

Grafting ofchitosan with fatty acyl derivatives

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