The results of the comparative analysis of exhaled air samples from patients with diabetes mellitus second type (target group) and healthy volunteers (control group) with using laser optical-acoustic IR spectroscopy are presented. The measured absorption spectra of exhaled air samples visualization were performed using the principal component analysis. The good spatial separation of the target and control groups in the space of the main components was achieved, which indicates a significant change in the composition and concentration of metabolites in the exhaled air of patients with diabetes. The volatile metabolites that may be characteristic of diabetes are also discussed.
The results of a comparative study of an emanation from the skin of patients with diabetes mellitus and healthy volunteers using THz spectroscopy. A technique for collecting and analyzing emanation samples from the skin has been developed, and its applicability in THz spectroscopy has been demonstrated. Good separation of THz spectra of the skin emanations has been shown for the target and control groups by the principal component analysis. It shows that THz spectroscopy of skin emanations is useful for the diagnosis of diabetes mellitus.
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