Interactions of DL-serine and L-serine with NaCl and KCl in aqueous solutions |
| |
Authors: | Mohammad K Khoshkbarchi Ana M Soto-Campos Juan H Vera |
| |
Institution: | (1) Department of Chemical Engineering, McGill University, H3A 2B2 Montreal, Quebec, Canada;(2) Department of Chemical Engineering, Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain |
| |
Abstract: | The activity coefficients at 25‡C of DL-serine and L-serine in aqueous solutions of NaCl and KC1 were measured. This study
examines the effect of the nature of the cation of the electrolyte on the activity coefficients of the optical-isomers of
serine in aqueous solutions for molality of serine up to 0.4 and molality of electrolyte up to 1. An electrochemical cell
with two ion-selective electrodes, a cation, and an anion ion selective electrode,vs. a double-junction reference electrode was used to measure the activity coefficients of the electrolyte and the results were
converted to the activity coefficients of serine in the aqueous electrolyte solution. The comparison of the results obtained
for DL- and L-serine indicates that the two optical isomers have identical interactions with electrolytes in aqueous solutions
and that for this amino acid the effect of the cation of the electrolyte is not significant. Comparison of these results with
previous measurements for DL-alanine in aqueous solutions of the same electrolytes show the notable effect of the backbone
of the amino acid. |
| |
Keywords: | Amino acids electrolyte solutions activity coefficients ions |
本文献已被 SpringerLink 等数据库收录! |
|