Interactions of some amino acids and glycine peptides with aqueous sodium dodecyl sulfate and cetyltrimethylammonium bromide at T=298.15 K: a volumetric approach

Singh, Swatantra P.; Kundu, Agnita; Kishore, Nand

doi:10.1016/j.jct.2003.09.010

Cited by 129 publications

(77 citation statements)

References 50 publications

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“…It is found that φ v° values of the studied homologous series of α-amino acids vary linearly with the number of carbon atoms in the alkyl chain of amino acids. Similar linear correlations have also been reported for α-amino acids [24,25], α-amino acids and glycine peptides in aqueous sodium dodecyl sulfate and cetyltrimethylammonium bromide [26], α-ω-amino acids in aqueous ammonium chloride [27], α-amino acids in aqueous calcium chloride [28], and for homologous series of α-and α-ω-amino acids in guanidium chloride and potassium thiocynate solutions [29]. This linear variation was represented by the relation…”

Section: Resultssupporting

confidence: 77%

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide at different temperatures

Ali

Shahjahan

2006

JICS

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Densities, ρ, viscosities, η, and refractive indices, n D , of glycine (Gly), DL-alanine (Ala), DL-valine (Val) (0.05, 0.10, 0.15, 0.20, 0.25 mol kg -1 ), and L-leucine (Leu) (0.02, 0.05, 0.10 mol kg -1 ) in water and in 0.20 mol kg -1 aqueous tetrapropylammonium bromide (TPAB) have been measured at 298.15, 303.15, 308.15, and 313.15 K. The density data have been utilized to calculate apparent molar volumes, φ v , partial molar volumes at infinite dilution, φ v°, and partial molar volumes of transfer, φ v°(tr) of amino acids. The viscosity data have been analyzed by means of Jones-Dole equation to obtain Falkenhagen coefficient, A, and JonesDole coefficient, B, free energy of activation of viscous flow per mole of solvent, Δμ 1°* , and solute, Δμ 2°* , and enthalpy, ΔH*, and entropy of activation , ΔS*, of viscous flow. The refractive index data have been used to calculate molar refractivity, R D, of amino acids in aqueous tetrapropylammonium bromide solutions. It has been observed that φ v°, B-coefficient and Δμ 2°* vary linearly with increasing number of carbon atoms in the alkyl chain of amino acids, and they were split to get contributions from the zwitterionic end groups (NH 3 + , COO -) and methylene group (CH 2 ) of the amino acids. The behavior of these parameters has been used to investigate the solute-solute and solute-solvent interactions as well as the effect of tetrapropylammonium cation (C 3 H 7 ) 4 N + on these interactions.

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Section: Resultssupporting

confidence: 77%

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide at different temperatures

Ali

Shahjahan

2006

JICS

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“…The study of specific and nonspecific interactions of surfactants with proteins has been a subject of extensive research due to its diverse importance [9]. However, in order to have fine details, the interactions of basic structural units of proteins (i.e., amino acids) with surfactants must be studied owing to the complex structure of the biological macromolecules [10]. The side chains of these building blocks differ in size, shape, charge, hydrogen-bonding capacity, hydrophobicity, and chemical reactivity.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Effect of Amino Acids/Peptide on Micellization of SDS at Different Temperatures

Ali

Ansari

2010

J Surfact & Detergents

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Conductivities of (0.001-0.012) m sodium dodecyl sulfate have been determined in water and in the presence of 0.10 m aqueous glycine/alanine/glycylglycine at 298.15, 303.15, 308.15, and 313.15 K. From the specific conductivity data, the critical micellar concentration, degree of counter ion association, degree of counterion dissociation, free energy of transfer of hydrophobic chain from the medium to interior of the micelle, and surface contribution, standard free energy of micellization, standard enthalpy of micellization, and standard entropy of micellization of sodium dodecyl sulfate have been computed. The thermodynamic parameters of micellization and the effect of additives on these parameters have been used to study the interactions present in the micellar systems.

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“…The interactions between surfactants and amino acids may affect the activity of the amino acids and can also influence the micellization process of surfactants. Furthermore, the investigation of the solution behavior of model compounds such as amino acids, peptides and their derivatives can provide useful information about the interaction which is possible in the proteins and/ or about their conformational stability [23][24][25].…”

mentioning

confidence: 99%

Conductometric Studies on Micellization of Cationic Surfactants in the Presence of Glycine

2015

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Values of the critical micelle concentration (cmc) and degree of counterion dissociation (a) of four cationic surfactants: cetyltrimethylammonium bromide (CTAB), cetylpyridinium bromide (CPB), cetylpyridinium chloride (CPC) and benzyldimethylhexadecylammonium chloride (BDHAC) in aqueous-glycine medium (concentration of glycine (Gly) varied from 0 to 0.20 molÁdm -3 ) were determined through conductometric measurements at 303 K. The effect of temperature on the micellization in the presence of 0.10 molÁdm -3 Gly were studied for the surfactants CTAB, CPC and BDHAC. With respect to the concentration of Gly, a decrease in the cmc was observed for CTAB, CPC and CPB whereas an increase was observed for BDHAC. A regular increase in a was obtained for CPB, CPC and BDHAC with respect to the concentration of Gly whereas values were roughly constant in the case of CTAB. Thermodynamic parameters were computed from the temperature dependence of the cmc values and it was found that the micellization process is exothermic. Compensation of enthalpy and entropy was observed for the micellization of CTAB, CPC and BDHAC in the presence of 0.10 molÁdm -3 Gly.

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Interactions of some amino acids and glycine peptides with aqueous sodium dodecyl sulfate and cetyltrimethylammonium bromide at T=298.15 K: a volumetric approach

Cited by 129 publications

References 50 publications

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide at different temperatures

Volumetric, viscometric and refractive index behavior of some α-amino acids in aqueous tetrapropylammonium bromide at different temperatures

Studies on the Effect of Amino Acids/Peptide on Micellization of SDS at Different Temperatures

Conductometric Studies on Micellization of Cationic Surfactants in the Presence of Glycine

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