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An observation on the analysis of urinary calculi by infrared spectroscopy

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Abstract

The central nuclei of 500 urinary calculi in Japan, including 421 calculi of upper urinary tracts, 64 calculi of lower urinary tracts and 15 prostatic calculi, were analysed by infrared spectroscopy. The results of analysis revealed that 50.8% of calculi were composed of mixed calcium oxalate-calcium phosphate; 17.4%, simple calcium oxalate; 17.4%, magnesium ammonium phosphate mixed with calcium phosphate, and probably also with calcium carbonate; 4.4%, uric acid and urate with or without calcium phosphate or calcium oxalate; 3.2%, calcium phosphate; 1.0%, cystine; and 0.2% (one case) were composed of protein.

Of 119 oxalate-phosphate calculi the ratios of calcium oxalate to calcium phosphate were measured on the chart of infrared spectra, and also the ratios of 53 cortices taken from these calculi were measured and compared to the ratios of these central nuclei. The results showed that the nuclei of oxalate-phosphate calculi contained greater amounts of calcium phosphate.

Résumé

Les noyaux centraux de 500 calculs urinaires, comportant 421 calculs des voies urinaires supérieures, 64 calculs des voies urinaires inférieures et 15 calculs de la prostate ont été analysés au Japon par spectroscopie infrarouge. Les résultats de cette analyse indiquent que 50,8% des calculs sont composés d'un mélange d'oxalate de calcium et phosphate de calcium: 17,4% d'oxalate de calcium simple; 17,4% de phosphate de magnésium ammoniaqué, mélangé au phosphate de calcium et probablement aussi au carbonate de calcium: 4,4% d'acide urique et d'urate avec ou sans phosphate de calcium ou d'oxalate de calcium: 3,2% de phosphate de calcium: 1,0% de cystine et 0,2% (un cas) constitué de protéine.

Sur 119 calculs, constitués d'oxalate-phosphate, les rapports de l'oxalate de calcium et du phosphate de calcium sont mesurés á l'aide des spectres infra-rouges et les rapports de 53 régions corticales de ces calculs ont été déterminés et comparés è ceux des régions nucléaires centrales. Il apparait ainsi que le noyau des calculs d'oxalate phosphate contient de plus grandes quantités de phosphate de calcium.

Zusammenfassung

In Japan wurden die zentralen Nuclei von 500 Nierensteinen mittels Infrarotspektroskopie untersucht. Es handelte sich dabei um 421 Steine aus den oberen Harnwegen, 64 Steine aus den unteren harnwegen und 15 Prostatasteine. Die Analysen ergaben folgende Resultate: 50,8% der Steine setzten sich aus einem Gemisch von Calciumoxalat und Calciumphosphat usammen; 17,4% enthielten nur Calciumoxalate; 17,4% bestanden aus einem Gemisch von Magnesiumammoniumphosphat mit Calciumphosphat und vermutlich auch Calciumcarbonat; 4,4% enthielten Harnsäure und Urate mit oder ohne Calciumphosphat oder Calciumoxalat; 3,2% bestanden aus Calciumphosphat; 1,0% aus Cystin und 0,2% (ein Fall) aus Protein.

Bei 119 Phosphatoxalatsteinen wurde das Verhältnis von Calciumoxalat zu Calciumphosphat aus den Kurven der erhaltenen Infrarotspektra bestimmt. Dieses Verhältnis wurde ebenfalls für die äußere Schicht von 53 solcher Steine berechnet und mit dem Wert der zugehörigen zentralen Nuclei verglichen. Aus diesen Resultaten geht hervor, daß die Nuclei der Phosphatoxalatsteine größere Mengen von Calciumphosphat enthalten.

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Takasaki, E. An observation on the analysis of urinary calculi by infrared spectroscopy. Calc. Tis Res. 7, 232–240 (1971). https://doi.org/10.1007/BF02062610

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