Conţinutul numărului revistei |
Articolul precedent |
Articolul urmator |
289 8 |
Ultima descărcare din IBN: 2024-01-20 13:48 |
SM ISO690:2012 HLISTUN, Victoria, CASIAN, Igor, CASIAN, Ana, DELEANU, Călin, NICOLESCU, Alina Florica, UŞURELU, Natalia. Determination of urinary creatinine in patients with alkaptonuria. In: Revista de Ştiinţe ale Sănătăţii din Moldova, 2022, nr. 3 An.1(29), p. 502. ISSN 2345-1467. |
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Revista de Ştiinţe ale Sănătăţii din Moldova | ||||||
Numărul 3 An.1(29) / 2022 / ISSN 2345-1467 | ||||||
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Pag. 502-502 | ||||||
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Introduction. Urinary creatinine is used to recalculate the concentrations of many metabolites in cases where nictemeral urine collection is difficult. The Jaffe method, widely used for this purpose, is simple and inexpensive, but not selective enough. In patients with alkaptonuria, homogentisic acid, excreted in the urine, is oxidized in alkaline environment, forming dark-colored products, leading to considerably increased results for creatinine. The aim of the study. The development of a Jaffe method variant, selective for homogentisic acid. Materials and Methods. „Lambda25” UV-VIS spectrophotometer (Perkin Elmer), normal urine samples, urine from patients with alkaptonuria, reference substances, reagents (picric acid, sodium hydroxide). Results. A modified variant of the Jaffe method with two wavelength measurements has been proposed, based on UV-VIS spectra analysis of the products of the interaction of creatinine with picric acid, of the metabolites obtained by homogentisic acid oxidation, as well as the kinetics of both reactions. The analytic response was calculated by the difference: A(520)-2.3·A(600). The method provides true results for creatinine in patients with alkaptonuria and it is comparable to the traditional Jaffe method after random error (CV up to 5% for medium concentrations). Conclusions. A simple and reliable variant of the Jaffe method has been developed, useful for the determination of urinary creatinine in patients with alkaptonuria. |
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Cuvinte-cheie creatinine, Alkaptonuria, Jaffe Method, creatinină, alcaptonurie, Metoda Jaffe |
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