Interaction of Some Amino Acids with Sodium Dodecyl Sulphate in Aqueous Solution at Different Temperatures

Abstract

The density ρ, and viscosity η of 0.00, 0.05, 0.10, 0.15, and 0.20 mol kg−1 glycine (Gly), dlalanine (Ala), dl-serine (Ser), and dl-valine (Val) have been measured in 0.002 mol kg−1 aqueous sodium dodecyl sulphate (SDS) at 298.15, 303.15, 308.15, and 313.15 K. These data have been used to calculate the apparent molar volume φv, infinite dilution apparent molar volume φv°, and the standard partial molar volumes of transfer φv° (tr), of the amino acids from water to the aqueous SDS solutions. Falkenhagen coefficient A, Jones-Dole coefficient B, free energies of activation per mole of solvent (aqueous SDS) Δμ1°*, and per mole solute (amino acids) Δμ2°*, also enthalpy ΔH* and entropy ΔS* of activation of viscous flow were evaluated using viscosity data. The molar refraction RD was calculated by using experimental values of the refractive index nD of the systems. The results have been interpreted in terms of ion-ion, ion-polar and hydrophobic-hydrophobic group interactions. The volume of the transfer data suggest that ion-ion intertactions are predominant.

Refractive index, conductometric, and fluorescence probe study on interaction of valine with aqueous solution of anionic surfactant, sodium dodecyl surfactant (SDS), at 298.15, 303.15, 308.15 and 313.15 K

“…A number of workers [22][23][24][25][26][27][28][29][30] have measured refractive index of liquids and liquids solutions using Abbe Refractometer. When a ray of light passes from one medium to another, it suffers refraction, that is, change of direction.…”

“…Studies on the interaction of amino acids with surfactants can contribute towards an understanding of the surfactants as tools to isolate, solubilize, and manipulate membrane proteins for subsequent biochemical and physical characterization [6][7][8]. Surfactant are the substance which decrease the surface tension of liquids [9][10][11][12][13] and they are used in many biological, agricultural and chemical processes [14][15][16][17][18]. It has been reported that SDS acts as a more potent protein denaturant than urea and guanidine hydrochloride [19].…”

Role of Surfactant in Dispersion of Carbon Nano Tubes to Use as Reinforcing Material for Biodegradable Nano Composites

“…The hydrophobic tail of CNTs interacts with the hydrophobic CNT surface during their dispersion in water with the help of amphiphilic surfactants, while the hydrophilic head group is oriented into the surrounding aquatic environment. Surfactant molecules form micelles when their concentration rises above the critical micelle concentration (CMC) [11][12][13][14][15]. These micellar assemblies can be found on CNT dispersions and serve to stabilize them [16].…”

Volumetric and viscometric study on the interaction of amino acid (valine) with an aqueous solution of cationic surfactant, Cetyltrimethylammonium Bromide (CTAB), at 298.15, 303.15, 308.15, and 313.15 K

“…Surfactants, which are also called wetting agents, help to decrease the tension between two liquids by reducing the surface tension of a liquid. [1][2][3][4][5][6][7][8][9][10][11][12][13]. The reduction in interfacial tension allows liquids to spread more easily.…”