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549.08:543.4:616.613(478) (1) |
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SM ISO690:2012 SHEPEL, Diana, RUSU, Maria. Infrared spectroscopy of urinary stones of patients from Republic of Moldova in 2016-2021. In: Ecological and environmental chemistry : - 2022, Ed. 7, 3-4 martie 2022, Chișinău. Chisinau: Centrul Editorial-Poligrafic al USM, 2022, Ediția 7, Vol.1, pp. 53-54. ISBN 978-9975-159-07-4.. 10.19261/eec.2022.v1 |
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Ecological and environmental chemistry Ediția 7, Vol.1, 2022 |
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Conferința "Ecological and environmental chemistry 2022" 7, Chișinău, Moldova, 3-4 martie 2022 | |||||||
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CZU: 549.08:543.4:616.613(478) | |||||||
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IR spectroscopy is used in diagnostic medicine to study the structure of urinary stones and to reveal their chemical composition. The chemical composition of urinary stones obtained from 183 patients with urolithiasis for the period 2016-2021 was studied using IR spectroscopy. A Spectrum 100 Fourier transform spectrometer (Perkin Elmer, USA, 2007) was used to determine the composition of urinary stones. The spectra were recorded using an ATR attachment in the form of a fine powder. There were found in the urinary stones such chemical components, as uric acid, uric acid hydrate, ammonium urate, wedellite СаС2О4·2Н2О, wevellite СаС2О4·Н2О, calcium phosphate Ca3(PO4)2, struvite MgNH4PO4·6Н2О, calcium carbonate CaCO3, brushite CaHPO4 2Н2О, cystine. These components were found both in an individual state and in the form of mixtures of substances. Very often (up to 40%) there were stones of a mixed type, including, for example, СаС2О4·2Н2О, СаС2О4·Н2О and Ca3(PO4)2 in different ratios. The interpretation of IR spectra was carried out using a database on IR spectra of urinary stones, as well as literature data on IR spectroscopy. The figure 1 shows the IR spectrum of a kidney stone containing vedellite СаС2О4· 2Н2О and Ca3(PO4)2. The spectrum shows absorption bands in the regions of 1611 and 1314 cm-1 correspond to symmetric and asymmetric stretching vibrations of the C-O and C=O of the oxalate group. The band in the region of 780 cm-1 indicates the presence of deformation vibrations (O-C=O) in the oxalate group СаС2О4·Н2О. The presence of strong absorption bands in the region of 1027 and 961 cm-1 indicates the content of calcium phosphate in urinary stones. Fig.1. IR spectrum of a kidney stone containing vedellite СаС2О4·2Н2О and Ca3(PO4)2. |
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