Sodium dodecyl sulfate promoting a cooperative association process of sodium cholate with bovine serum albumin

Schweitzer, Bianca; Felippe, Arlindo C.; Dal-Bó, Alexandre Gonçalves; Minatti, Edson; Zanette, Dino; Lopes, António

doi:10.1016/j.jcis.2005.12.025

Cited by 14 publications

(6 citation statements)

References 29 publications

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“…17,19 Our research group has extensively studied micellar systems formed by the self-assembly of copolymers 20,21 and surfactants. [22][23][24][25] We have investigated a large collection of synthetic polymers and biopolymers, [26][27][28] as well as surfactants and biosurfactants. [27][28][29][30] Interestingly, interactions between water-soluble uncharged polymers and the anionic surfactants have been widely investigated for several decades.…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24][25] We have investigated a large collection of synthetic polymers and biopolymers, [26][27][28] as well as surfactants and biosurfactants. [27][28][29][30] Interestingly, interactions between water-soluble uncharged polymers and the anionic surfactants have been widely investigated for several decades. On the other hand, few studies concerning the interactions of mixtures of bile salts and polyelectrolytes are found in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Supramolecular complexes formed by the association of poly(ethyleneimine) (PEI), sodium cholate (NaC) and sodium dodecyl sulfate (SDS)

Felippe

Bellettini

Eising

et al. 2011

J. Braz. Chem. Soc.

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A formação de complexos supramoleculares em solução aquosa pela associação do polieletrólito poli(etilenoimina) (PEI) com misturas do biossurfactante colato de sódio (NaC) e o surfactante aniônico dodecil sulfato de sódio (SDS) foi aqui investigado usando as técnicas de condutivimetria, tensiometria, fluorimetria, espalhamento de raios X a baixos ângulos (SAXS) e medidas de pH. Os resultados de fluorimetria, condutivimetria e medidas de pH levaram à conclusão de que os monômeros de NaC e SDS ligam-se primeiramente em sítios específicos das cadeias do polieletrólito PEI via interação eletrostática e posteriormente através de associação cooperativa. A interação do NaC com o PEI é mais fraca do que a interação do SDS com o PEI, porém, a adição de SDS ao sistema NaC-PEI levou à formação de micelas mistas SDS-NaC que interagiram fortemente com o polieletrólito PEI. Os resultados de SAXS sugeriram que o complexo supramolecular possui característica elipsoidal e essa forma não depende da concentração de surfactante nem da χ NaC .The formation of supramolecular complexes produced by association of poly(ethyleneimine) (PEI) and mixtures of sodium cholate (NaC) and sodium dodecyl sulfate (SDS) was investigated by pH, electrical conductivity, fluorescence spectroscopy and small angle X-ray scattering (SAXS) measurements. The fluorescence linked to previously measured values of pH and conductivity led to the conclusion that NaC and SDS molecules firstly bind to specific sites of the PEI chains via electrostatic interaction and secondly undergo self-assembly through regular cooperative association. The interaction of NaC with the polyelectrolyte PEI is weaker than that of SDS and the addition of SDS to the NaC-PEI system led to the formation of mixed NaC-SDS micelles which stronger interact with PEI. The SAXS results suggested that the micellar aggregates have a considerably ellipsoidal characteristic and the micellar shape is not affected by the surfactant concentration nor by χ NaC .Keywords: sodium cholate, sodium dodecyl sulfate, poly(ethyleneimine), polymer-surfactants interaction IntroductionBile salts are naturally-occurring amphiphilic molecules. They are physiologically important in the solubilization and transport of fats and lipids. The structure of bile salts in water has been extensively investigated. Although they are comparable to common surfactants, the general conclusion is that biosurfactants self-assemble in a different way than the standard surfactants. [1][2][3][4][5][6][7][8][9][10][11][12][13] Poly(ethyleneimine) (PEI) is a member of a large family of water-soluble polyamines having different molecular weights (M w ) and polymer architectures. Polyamines are weak bases and exhibit a cationic character depending on the degree of protonation. PEI has been extensively studied (particularly the branched form) due to its intense use in the formulation of drugs, thickeners, flocculating agents, personal care products, food products, detergents and adhesives. It has also been used for biological proposes to p...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Supramolecular complexes formed by the association of poly(ethyleneimine) (PEI), sodium cholate (NaC) and sodium dodecyl sulfate (SDS)

Felippe

Bellettini

Eising

et al. 2011

J. Braz. Chem. Soc.

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“…There is a significant difference in molecular structure of BS and conventional head-tail surfactants. In particular they have quite different hydrophobic moieties (rigid and facial), which leads to their interesting aggregation properties when mixed with a surfactant of the same charge in aqueous solution, as reported in the literature [27][28][29][30][31][32]. For such mixed systems including a bile salt, it is expected that the molecular self-assembling process may be controlled mainly by the interaction between the hydrophobic rigid face and the flexible alkyl tail, but there is to date a striking lack of thorough investigations on the thermodynamic characterization of the energetics of their interactions [27,31].…”

Section: Introductionmentioning

confidence: 84%

Interaction between a hydrophobic rigid face and a flexible alkyl tail: Thermodynamics of self-assembling of sodium cholate and SDS

Bai

Sheng

Wang

et al. 2016

The Journal of Chemical Thermodynamics

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“…The increase in viscosity corresponds to the binding of surfactant monomers with electrolyte. Further increase in viscosity with increase in concentration of surfactant might be due to cross linking of several aggregation of micelle form by free surfactant monomers and electrolyte (Hoff et al 2001;Schweitzer et al 2006). Viscosity increases with the increase of concentration of electrolyte (Bakshi & Kaur 2003).…”

Section: Surface Tension Measurementmentioning

confidence: 99%

Effect of Electrolyte (NaCl) and Temperature on the Mechanism of Cetyl Trimethylammonium Bromide Micelles

Haq¹,

Rehman²,

Ali³

et al. 2017

JSM

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Sodium dodecyl sulfate promoting a cooperative association process of sodium cholate with bovine serum albumin

Cited by 14 publications

References 29 publications

Supramolecular complexes formed by the association of poly(ethyleneimine) (PEI), sodium cholate (NaC) and sodium dodecyl sulfate (SDS)

Supramolecular complexes formed by the association of poly(ethyleneimine) (PEI), sodium cholate (NaC) and sodium dodecyl sulfate (SDS)

Interaction between a hydrophobic rigid face and a flexible alkyl tail: Thermodynamics of self-assembling of sodium cholate and SDS

Effect of Electrolyte (NaCl) and Temperature on the Mechanism of Cetyl Trimethylammonium Bromide Micelles

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