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Dielectric Study of Aqueous Solutions of Alanine and Phenylalanine
Author(s) -
Chaudhari H. C.,
Chaudhari Ajay,
Mehrotra S. C.
Publication year - 2005
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.200500002
Subject(s) - chemistry , phenylalanine , dielectric , aqueous solution , enthalpy , alanine , reflectometry , molar , standard molar entropy , relaxation (psychology) , analytical chemistry (journal) , thermodynamics , amino acid , organic chemistry , time domain , standard enthalpy of formation , biochemistry , materials science , medicine , social psychology , psychology , physics , optoelectronics , dentistry , computer science , computer vision
Dielectric relaxation measurements on aqueous solutions of alanine and phenylalanine were carried out using time domain reflectometry (TDR) at 25, 30, 35, and 40 °C in the frequency range from 10 MHz to 20 GHz. Aqueous solutions of alanine and phenylalanine are prepared for five different molar concentrations of the respective amino acid. For all the solutions considered, only one relaxation peak was observed in this frequency range. The relaxation peaks shift to lower frequency with an increase in alanine and phenylalanine molar concentration. The molar enthalpy of activation and molar entropy of activation show endothermic interactions.