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Thermodynamics of the interactions of some amino acids and peptides with dodecyltrimethylammonium bromide and tetradecyltrimethylammonium bromide

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Title Thermodynamics of the interactions of some amino acids and peptides with dodecyltrimethylammonium bromide and tetradecyltrimethylammonium bromide
 
Creator TALELE, P
KISHORE, N
 
Subject Amino acids
Peptides
Partial molar volume
Partial molar compressibility
Enthalpy of dilution
Transfer thermodynamic properties
PARTIAL MOLAR VOLUMES
SODIUM DODECYL-SULFATE
AQUEOUS-SOLUTIONS
SURFACTANT INTERACTIONS
CETYLTRIMETHYLAMMONIUM BROMIDE
MEMBRANE-PROTEIN
DIFFERENT TEMPERATURES
HEAT-CAPACITIES
298.15 K
WATER
 
Description The values of apparent molar volume V-2,V-phi and apparent molar adiabatic compressibility K-S,K-2,K-phi of amino acids glycine, L-alanine, DL-alpha-amino-n-butyric acid, L-valine, L-leucine and peptides glycyl-glycine, glycyl-glycyl-glycine and glycyl-leucine have been determined in aqueous solutions of cationic surfactants dodecyltrimethylammonium bromide (DTAB) and tetradecyltrimethylammonium bromide (TTAB) by means of density and sound velocity measurements. The heat evolved or absorbed (q) during the course of interactions of amino acids and peptides with the aqueous solutions of surfactants were determined by isothermal titration calorimetry at T = 298.15 K. The values of standard partial molar volume V-2,m(0) and standard partial molar adiabatic compressibility K-s,2,m(0) at infinite dilution were calculated from the values of V-2,V-phi and K-S,K-2,K-phi. Similarly the values of limiting enthalpies of dilution (Delta H-dii(0)) of the amino acids/peptides were calculated from heat evolved or absorbed during calorimetric experiments. The standard partial molar quantities of transfer from water to aqueous surfactant solutions have been used to identify the interactions of amino acids and peptides with surfactants in terms of ionic-ionic, ionic-hydrophobic and hydrophobic-hydrophobic group interactions. (C) 2013 Elsevier Ltd. All rights reserved.
 
Publisher ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
 
Date 2014-12-28T11:13:53Z
2014-12-28T11:13:53Z
2014
 
Type Article
 
Identifier JOURNAL OF CHEMICAL THERMODYNAMICS, 70182-189
0021-9614
1096-3626
http://dx.doi.org/10.1016/j.jct.2013.11.001
http://dspace.library.iitb.ac.in/jspui/handle/100/16330
 
Language English