TY - JOUR
T1 - Determination of the activity coefficients of glycylglycine and glycyl-L-alanine in sodium chloride solutions by an electrochemical cell with ion-selective electrodes
T2 - Experimental measurements and thermodynamic theory
AU - Breil, M. P.
AU - Mollerup, J. M.
AU - Rudolph, E. S.J.
AU - Ottens, M.
AU - Van Der Wielen, L. A.M.
PY - 2001/11/15
Y1 - 2001/11/15
N2 - An electrochemical cell with a cation and an anion ion-selective electrode (ISE) was used to determine the activity coefficients of two dipeptides, glycylglycine (GG) and glycyl-L-alanine (GA), in aqueous NaCl solutions at 298.15K. The thermodynamic theory including possible reference states and normalisations of activity coefficients is revisited. The effect of adding dipeptide to the electrolyte solution is stronger at low salt concentration than at higher salt concentration. The change of the activity coefficient ratio of the dipeptide is most pronounced at low concentrations of both solutes. Close to saturation, GA shows salting-in.
AB - An electrochemical cell with a cation and an anion ion-selective electrode (ISE) was used to determine the activity coefficients of two dipeptides, glycylglycine (GG) and glycyl-L-alanine (GA), in aqueous NaCl solutions at 298.15K. The thermodynamic theory including possible reference states and normalisations of activity coefficients is revisited. The effect of adding dipeptide to the electrolyte solution is stronger at low salt concentration than at higher salt concentration. The change of the activity coefficient ratio of the dipeptide is most pronounced at low concentrations of both solutes. Close to saturation, GA shows salting-in.
KW - Activity coefficient
KW - Data
KW - Dipeptides
KW - Experimental method
KW - Ion-selective electrodes
KW - Salt
UR - http://www.scopus.com/inward/record.url?scp=0035890596&partnerID=8YFLogxK
U2 - 10.1016/S0378-3812(01)00622-7
DO - 10.1016/S0378-3812(01)00622-7
M3 - Article
AN - SCOPUS:0035890596
SN - 0378-3812
VL - 191
SP - 127
EP - 140
JO - Fluid Phase Equilibria
JF - Fluid Phase Equilibria
IS - 1-2
ER -