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- W2052068679 abstract "A fluorometric determination of urinary 17-hydroxycorticosteroids using a reaction of benzamidine with compounds carrying the dihydroxyacetone side chain is described. The fluorescent compounds have excitation and emission maxima at 370 and 480 nm, respectively. The method includes enzymatic hydrolysis with beta-glucuronidase (EC 3.2.1.31, from Escherichia coli) and extraction with methylene chloride and generation of fluorescence in alkaline solution (pH 13.4). The specificity of the reaction was examined and the results were compared with those of an accepted method based on the Porter-Silber reaction (C. C. Porter and R. H. Silber, 1950, J. Biol. Chem. 185, 201-207). The coefficient of correlation was 0.945 with regression line of y = 0.91x + 0.7 mg/day (y, present method; x, Porter-Silber reaction method). Sensitivity of the reaction was 0.5 microgram/ml of standard or sample, mean recovery of cortisol added to five urine samples (5-micrograms addition) was 95%, and the coefficient of variation of the method (five repeated assays of sample with a value of 5.2 mg/liter) was 6.2%." @default.
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- W2052068679 date "1984-10-01" @default.
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- W2052068679 title "A fluorometric determination of urinary 17-hydroxycorticosteroids using benzamidine" @default.
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- W2052068679 doi "https://doi.org/10.1016/0003-2697(84)90538-4" @default.
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