Hydration of the Zwitterionic Forms οf Amino Acids from the Acoustic Passynski Method

Abstract

In this communication, we report the compressibility measurements made on amino acids in water at 25 C, compared with aqueous short-chained amines and carboxylic acids. The effect of the charge caused by protonation of the amino group and/or deprotonation of the carboxylic one was tested. The concept of additivity of the hydration number with the constituents of solute molecule was applied and discussed.