The interaction capacity of asbestos with albumin was studied. Asbestos fibres were treated with bovine serum albumin and were investigated by Fourier transform infrared (IR) spectrometry, conventional IR spectrometry and wide-line nuclear magnetic resonance spectrometry. In asbestos, the presence of active sites on the surface of the fibres was evidenced through external and internal OH stretching vibrations. It was also demonstrated that in asbestos fibres treated with albumin mixed hydrogen bonds of the type O-H...Nalbumin or O...H-Nalbumin occur. A physical interaction between asbestos fibres and albumin was demonstrated.
The influence of SDS upon the molecular properties of proflavine (3,6-diaminoacridine), acridine yellow (2,7-dimethyl-3,6-diaminoacridine) and methylene blue (3,7-bis-dimethylamino-phenothiazine) was studied comparatively to their properties in that of aqueous media. The absorption and emission spectra of the three dyes in SDS aqueous solution (1-100 mmol/l) were recorded. The spectroscopic data also allowed the evaluation of the critical micellization concentration (CMC), acidity constants in fundamental (pk(a)) and excited (pK(*)(a)) states, and lifetimes of excited singlet states.
Conformational transformations of the tetraenic nystatin chromophore under the influence of solvents and UV irradiation have been studied by absorption, fluorescence and wide-line NMR spectroscopy.
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