[Infrared spectroscopy of the dry urinary residue of healthy persons].

Dry urine residue and mineralized dry urine of clinically healthy subjects, aged from 2 months to 94 years were investigated by the method of infrared spectroscopy in Nujol and in tablets of potassium bromide. The subjects examined were subdivided into 4 age groups -- I group, children aged from 2 months to 12 months: II group -- 1 to 3 years: III group 20--80 years and IV group 80--94 years. The regions 900--1000 cm-1, where phosphates are absorbed, called "phosphate" region and 1500--1700 cm-1, where protein components are absorbed, called "protein" region were followed up. The following was observed with both methods: a) the maximum of "phosphate" band is shifted to the greater value of the wave number with age advancing, b) "protein" component intensity grows with age advancing. The general form of the spectra both in Nujol and in potassium bromide is characteristic and almost identical with both methods for each age group. The identity of the spectra enables the application of Nujol method in the practice as less labour consuming, not requiring special apparatuses and cheaper. The information obtained could be used as a comparison in urine tests of patients with bone tumours, where, according to literature data, characteristic spectra are observed.