Infrared spectra of aqueous solutions of dimethylsulphoxide (DMSO) in a wide range of concentrations are presented and discussed. The present work is preliminary to a wider research including Raman laser and near infrared vibrational investigations. In the infrared spectra it is possible to observe the presence of at least three components in a certain range of more concentrated solutions, and the presence of a single component in the case of more dilute solutions. As a preliminary hypothesis,...
This work concerns the spectroscopic vibrational study of the different polymorphic forms of cholesterol (anhydrous, monohydrate and form II) known in the literature in order to complete a program of vibrational researches on the structure and composition of gallstones. These three forms of cholesterol are distinguishable in i.r. spectra for the region of stretching. In particular, the structure of the water in monohydrate cholesterol has been examined relatively to a recent x-ray study. The structure...
A structural model for the concentrated aqueous solutions of electrolytes is assigned by spectroscopical-vibrational data. The model is then applied to the concentrated aqueous solutions of guanidinium hydro chloride, considering Raman, i.r. and near i.r. spectra. Guanidinium hydrochloride has been chosen because it shows denaturing properties in regard to proteins in concentrated aqueous solutions. The aim of this work is to give a first contribution to the study of the denaturing mechanism, considering...
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