The effect of amino acids on the surface and thermodynamic properties of poly[oxyethylene(10)] lauryl ether in aqueous solution

Rakshit, Animesh Kumar; Sharma, Bhaskar

doi:10.1007/s00396-002-0743-7

Cited by 72 publications

(38 citation statements)

References 2 publications

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“…The CMC values of C 12 E 10 in the presence of sugars at different temperatures are presented in Table 1. At a particular temperature, the CMC value without any additive was in good agreement with values in the literature (9,10,14,42). The CMC values of C 12 E 10 were found to decrease with an increase in temperature in the absence of sugars, consistent with observations in a previous work (8).…”

Section: Resultssupporting

confidence: 91%

“…Negative transfer enthalpies also were reported for the transfer of NaCl and amino acids from water to an aqueous urea solution (14,46). This shows that the transfer of hydrophilic (OE) groups from water to the (9) showed that for dilute solutions of polar additives in an aqueous surfactant solution at CMC, the following general form of the classical Setchenow equation was well obeyed: [7] where CMC w and CMC w+A are the CMC values of a surfactant in the absence and in the presence of additives, K M is a micellization constant, and m′ is the molarity of the additive.…”

Section: Resultsmentioning

confidence: 86%

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Investigation of the properties of decaoxyethylene n‐dodecyl ether, C₁₂E₁₀, in the aqueous sugar‐rich region

Sharma

Rakshit

2004

J Surfact & Detergents

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Interfacial, thermodynamic, and morphological properties of decaoxyethylene n-dodecylether [CH 3 (CH 2 ) 11 (OCH 2 CH 2 ) 10 OH] (C 12 E 10 ) in aqueous solution were analyzed by tensiometric, viscometric, proton nuclear magnetic resonance (NMR), and small-angle neutron scattering (SANS) techniques. Dynamic and structural aspects at different temperatures in the absence and presence of sugars at different concentrations were measured. Critical micelle concentrations (CMC) were determined by surface tension measurements in the presence of ribose, glucose, and sucrose. The heat capacity (∆C p.m. ), transfer enthalpy (∆H m.tr. ), transfer heat capacities (∆C p.m.tr. ), micellization constant (K m ), Setchenow constant (K S N ), and partition coefficient (q) were determined and discussed as an extension of the usual thermodynamic quantities of micellization and adsorption at the air-water interface. An enthalpy-entropy compensation effect was observed with an isostructural temperature (T c ) of about 310 K for both micellization and interfacial adsorption. SANS measurements were taken to elucidate structural information, viz., aggregation number (N agg ), shape, size, and number density (N m ) on C 12 E 10 micelles in D 2 O at different concentrations of sugars (0.05, 0.02, 0.3, and 0.5 M) and temperatures (30, 45, and 60°C). Intrinsic viscosity gave the hydrated micellar volume (V h ), volume of the hydrocarbon core (V c ), and volume of the palisade layer of the oxyethylene (OE) unit (V OE ). SANS, as well as rheological data, supported the formation of nonspherical micelles with or without sugars. By SANS, we also observed that at the studied temperature intervals, oblate ellipsoid micelles changed into prolate ellipsoids and the number density of micelles decreased with an increase in temperature both in the presence and in the absence of sugars and also on increasing the concentration of sugars. Proton NMR showed a change in chemical shift of the OE group of micelles above the CMC. We also studied the phase separation of C 12 E 10 by sugars in cloud point measurements.Paper no. S1398 in JSD 7, 305-316 (July 2004).KEY WORDS: Aggregation number, cloud point, critical micelle concentration, nonionic surfactant, small-angle neutron scattering, viscosity.Surfactant molecules self-assemble into finite-sized aggregates called micelles in aqueous solution. These are significant for their numerous uses, including solubilization, dispersion, emulsification, catalysis, and technological, biological, and pharmaceutical applications. Such aggregates are formed in various shapes, e.g., globular, ellipsoidal, cylindrical, and disk-shaped (1). The morphology of micelles depends on the chemical structure of the surfactant monomer (2) and on solution conditions such as concentration, temperature, co-surfactant, and ionic strength (3,4). Control of the morphology of these types of aggregates by the addition of external additives or by the proper choice of surfactant mixture has become increasingly important in recent years, both ...

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 86%

Investigation of the properties of decaoxyethylene n‐dodecyl ether, C₁₂E₁₀, in the aqueous sugar‐rich region

Sharma

Rakshit

2004

J Surfact & Detergents

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“…4(a)-(d). Variations in the CPs of the triblock polymer systems reflect the water structure influencing tendency of sugars [19,36]. A continuous decrease in the CP with increases in sugar concentration is observed (Figs.…”

Section: Effect Of Sugarsmentioning

confidence: 87%

“…Interactions between surfactants and biomolecules are the focus of current scientific research as the surfactants are not only being employed as a medium but are also being used as important constituents of systems that mimic living systems in vitro. A number of research groups are actively engaged in revealing the secrets of surfactant-biomolecule interactions by the study of additive effects of different biomolecules on the physicochemical properties of surfactants [19][20][21][22]. Rakshit et al [19] have studied the effect of amino acids (glycine, alanine and valine) as additives on the physicochemical properties of polyoxyethylene (10) lauryl ether and a decrease in cmc with increasing concentration of the amino acids has been reported.…”

Section: Introductionmentioning

confidence: 97%

“…A number of research groups are actively engaged in revealing the secrets of surfactant-biomolecule interactions by the study of additive effects of different biomolecules on the physicochemical properties of surfactants [19][20][21][22]. Rakshit et al [19] have studied the effect of amino acids (glycine, alanine and valine) as additives on the physicochemical properties of polyoxyethylene (10) lauryl ether and a decrease in cmc with increasing concentration of the amino acids has been reported. Addition of different sugars (D-ribose, D-glucose and sucrose) on nonionic surfactants has been investigated using small angle neutron scattering [20] and it was observed that the nature of the sugar affects only the micellar growth and number density of micellar systems while the structural aspects remain unaffected.…”

Section: Introductionmentioning

confidence: 97%

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Phase Separation of Triblock Polymers and Tritons in the Presence of Biomolecules

2012

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Surfactant-biomolecule interactions have been investigated by studying the additive effect of various kinds of biomolecules such as amino acids, dipeptides, amino alcohols, sugars, hydroxy acids and dicarboxylic acids on the cloud point behavior of nonionic surfactants including triblock polymers (L64, P84) and tritons (TX100, TX114). In most cases, addition of biomolecules has been found to cause a depression in the cloud point of the triblock polymers and tritons. The presence of biomolecules in the solution of a nonionic surfactant causes drastic changes to the clouding behavior of the surfactant, especially at high biomolecule concentrations. The results reveal that both hydrophobicity and structural aspects play important roles in the observed cloud point variation of the nonionic surfactants.

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Elucidation of Interactions between l‐Ascorbic Acid and Mixed Micellar Aggregates of Catanionic {Sodium Dodecylsulfate + Cetyltrimethylammonium Bromide} Surfactants via Physicochemical and Spectroscopic Studies

Banipal

Sohal

Arti

et al. 2019

J Surfact & Detergents

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Surfactant micelles mimic the microenvironment present in biological systems and can act as a medium for antioxidant studies. Moreover, the thermodynamic profile of micellization and spectroscopic studies provides very good information about interactions in these systems. Thus, the mixed micellar behavior of sodium dodecylsulfate (SDS) and cetyltrimethylammonium bromide (CTAB) at varying mole fractions of SDS was studied in (0.01, 0.02, and 0.03) mol kg−1 ʟ‐ascorbic acid(aq) solutions with the aid of various techniques viz., conductivity, density and sound velocity, and spectroscopy. From the CMC values of the mixed surfactants, the degree of ionization (β) and thermodynamic parameters (normalΔGm°, normalΔHm°, and normalΔSm°) were evaluated at 298.15, 308.15, and 318.15 K. The UV absorption spectra were recorded in (1–3) × 10−4 mol kg−1 ʟ‐ascorbic acid(aq) solutions at various mole fractions of SDS. The proton (1H) NMR spectra of mixed (SDS + CTAB) surfactants were studied in (0.01–0.03) mol kg−1 ʟ‐ascorbic acid solutions. Hydrodynamic diameters (Dh) of mixed micellar aggregates were obtained from the dynamic light scattering (DLS) studies. The present studies suggest the predominance of ionic‐hydrophilic interactions between the ionic head groups {O‐SO3− or N+ (CH3)3} of surfactants and the polar (–OH, –C=O and –O–) sites of ʟ‐ascorbic acid.

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The effect of amino acids on the surface and thermodynamic properties of poly[oxyethylene(10)] lauryl ether in aqueous solution

Cited by 72 publications

References 2 publications

Investigation of the properties of decaoxyethylene n‐dodecyl ether, C₁₂E₁₀, in the aqueous sugar‐rich region

Investigation of the properties of decaoxyethylene n‐dodecyl ether, C₁₂E₁₀, in the aqueous sugar‐rich region

Phase Separation of Triblock Polymers and Tritons in the Presence of Biomolecules

Elucidation of Interactions between l‐Ascorbic Acid and Mixed Micellar Aggregates of Catanionic {Sodium Dodecylsulfate + Cetyltrimethylammonium Bromide} Surfactants via Physicochemical and Spectroscopic Studies

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The effect of amino acids on the surface and thermodynamic properties of poly[oxyethylene(10)] lauryl ether in aqueous solution

Cited by 72 publications

References 2 publications

Investigation of the properties of decaoxyethylene n‐dodecyl ether, C12E10, in the aqueous sugar‐rich region

Investigation of the properties of decaoxyethylene n‐dodecyl ether, C12E10, in the aqueous sugar‐rich region

Phase Separation of Triblock Polymers and Tritons in the Presence of Biomolecules

Elucidation of Interactions between l‐Ascorbic Acid and Mixed Micellar Aggregates of Catanionic {Sodium Dodecylsulfate + Cetyltrimethylammonium Bromide} Surfactants via Physicochemical and Spectroscopic Studies

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Product

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Investigation of the properties of decaoxyethylene n‐dodecyl ether, C₁₂E₁₀, in the aqueous sugar‐rich region

Investigation of the properties of decaoxyethylene n‐dodecyl ether, C₁₂E₁₀, in the aqueous sugar‐rich region