Interaction of bile salts with hexadecyltrimethylammonium bromide and sodium dodecyl sulfate

Jana, Pulak Kumar; Moulik, Satya P.

doi:10.1021/j100176a089

Cited by 186 publications

(166 citation statements)

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“…The cmc values of NaTDC at pH 12 were determined to be in the range of 5.6 to 8.1 mM, consistent with the upper end of literature reports of 4-7 mM. 35,37,38 Also, as expected based on surface tension and dye solubilization methods reported by Roda et al, 35 a lower cmc was obtained for the dihydroxy bile salts NaDC and NaTDC than for the trihydroxy bile salt NaC. More important, the thermodynamic parameters ΔH demic , ΔG demic , and TΔS demic for the NaTDC follow the same trends seen for the NaC micelle system, but with slightly differing magnitudes.…”

Section: Thermodynamics Of Chiral Recognition In Bile Salt Micellessupporting

confidence: 85%

Direct Measurement of the Thermodynamics of Chiral Recognition in Bile Salt Micelles

2016

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Isothermal titration calorimetry (ITC) is shown to be a sensitive reporter of bile salt micellization and chiral recognition. Detailed ITC characterization of bile micelle formation as well as the chiral recognition capabilities of sodium cholate (NaC), deoxycholate (NaDC), and taurodeoxycholate (NaTDC) micelle systems are reported. The ΔH(demic) of these bile salt micelle systems is directly observable and is strongly temperature-dependent, allowing also for the determination of ΔCp(demic). Using the pseudo-phase separation model, ΔG(demic) and TΔS(demic) were also calculated. Chirally selective guest-host binding of model racemic compounds 1,1'-bi-2-napthol (BN) and 1,1'-binaphthyl-2,2'-diylhydrogenphosphate (BNDHP) to bile salt micelles was then investigated. The S-isomer was shown to bind more tightly to the bile salt micelles in all cases. A model was developed that allows for the quantitative determination of the enthalpic difference in binding affinity that corresponds to chiral selectivity, which is on the order of 1 kJ mol(-1).

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Section: Thermodynamics Of Chiral Recognition In Bile Salt Micellessupporting

confidence: 85%

Direct Measurement of the Thermodynamics of Chiral Recognition in Bile Salt Micelles

2016

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“…54 Comparison between the free energy profiles for HFBII and HFBI show that despite the close similarity of these proteins, they have markedly different interfacial adsorption properties. In particular HFBII is hydrophilic (barrier to desorption is lower towards water than towards octane), whereas HFBI is slightly hydrophobic.…”

Section: Interfacial Adsorption Strengthmentioning

confidence: 99%

Molecular Simulation of Hydrophobin Adsorption at an Oil–Water Interface

Cheung

2012

Langmuir

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Hydrophobins are small, amphiphilic proteins expressed by strains of filamentous fungi.They fulfil a number of biological functions, often related to adsorption at hydrophobic interfaces, and have been investigated for a number of applications in materials science and biotechnology. In order to understand the biological function and applications of these proteins a microscopic picture of the adsorption of these proteins at interfaces is needed. Using molecular dynamics simulations with a chemically detailed coarse-grained potential the behaviour of typical hydrophobins at the water-octane interface is studied. Calculation of the interfacial adsorption strengths indicates that the adsorption is essentially irreversible, with adsorption strengths of the order of 100 k B T (comparable to values determined for synthetic nanoparticles but significantly larger than small molecule surfactants and biomolecules). The protein structure at the interface is unchanged at the interface, which is consistent with the biological function of these proteins. Comparison of native proteins with pseudoproteins that consist of uniform particles shows that the surface structure of these proteins has a large effect on the interfacial adsorption strengths, as does the flexibility of the protein.

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“…[11][12][13] In addition, extensive research has been done to study the properties of reverse-micellar systems, such as the micropolarity and microviscosity of the water core, micellar size, and thermodynamics. Many techniques, such as UV/Vis spectroscopy, [14][15][16] FTIR spectroscopy, [17][18][19] fluorescence spectroscopy, [20,21] small-angle neutron scattering analysis, [22,23] small-angle X-ray scattering analysis, [24,25] and microcalorimetry [26][27][28] have been used to characterize reverse-micellar solutions. In recent years, microemulsions with supercritical CO 2 as the continuous phase have been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Compressed CO₂ on the Critical Micelle Concentration and Aggregation Number of AOT Reverse Micelles in Isooctane

Chen¹,

Zhang²,

Han³

et al. 2006

Chemistry A European J

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The effect of compressed CO2 on the critical micelle concentration (cmc) and aggregation number of sodium bis-2-ethylhexylsulfosuccinate (AOT) reverse micelles in isooctane solution was studied by UV/Vis and fluorescence spectroscopy methods in the temperature range of 303.2-318.2 K and at different pressures or mole fractions of CO2 (X(CO2)). The capacity of the reverse micelles to solubilize water was also determined by direct observation. The standard Gibbs free energy (DeltaGo(m)), standard enthalpy (DeltaHo(m)), and standard entropy (DeltaSo(m)) for the formation of the reverse micelles were calculated by using the cmc data determined. It was discovered that the cmc versus X(CO2) curve and the DeltaGo(m) versus X(CO2) curve for a fixed temperature have a minimum, and the aggregation number and water-solubilization capacity of the reverse micelles reach a maximum at the X(CO2) value corresponding to that minimum. These results indicate that CO2 at a suitable concentration favors the formation of and can stabilize AOT reverse micelles. A detailed thermodynamic study showed that the driving force for the formation of the reverse micelles is entropy.

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Interaction of bile salts with hexadecyltrimethylammonium bromide and sodium dodecyl sulfate

Cited by 186 publications

References 0 publications

Direct Measurement of the Thermodynamics of Chiral Recognition in Bile Salt Micelles

Direct Measurement of the Thermodynamics of Chiral Recognition in Bile Salt Micelles

Molecular Simulation of Hydrophobin Adsorption at an Oil–Water Interface

Effect of Compressed CO₂ on the Critical Micelle Concentration and Aggregation Number of AOT Reverse Micelles in Isooctane

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Interaction of bile salts with hexadecyltrimethylammonium bromide and sodium dodecyl sulfate

Cited by 186 publications

References 0 publications

Direct Measurement of the Thermodynamics of Chiral Recognition in Bile Salt Micelles

Direct Measurement of the Thermodynamics of Chiral Recognition in Bile Salt Micelles

Molecular Simulation of Hydrophobin Adsorption at an Oil–Water Interface

Effect of Compressed CO2 on the Critical Micelle Concentration and Aggregation Number of AOT Reverse Micelles in Isooctane

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Product

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Effect of Compressed CO₂ on the Critical Micelle Concentration and Aggregation Number of AOT Reverse Micelles in Isooctane