… method based on isotope dilution-mass fragmentography. Our method is considerably simpler
… EC 3.5.3.3, which catalyzes the hydrolysis of creatine to sarcosine and urea). When we …

… For example, it is regularly measured as blood urea nitrogen (BUN). Because urea is so …
Determination of serum urea by isotope dilution mass spectrometry as a candidate definitive …

… in the detection sensitivity for each analyte. The LI mass fragmentography was also simple
… , further pretreatment may be required to remove urea from the sample. Similarly, further …

… dose of PAA, the blood level of PAA reached … blood urea nitrogen remained normal during
infusion. In all cases where the cause of death was determined as toxic nephrosis, the blood …

… analysis by MS/MS of blood or by other means. We also used MS/MS analysis of urine or blood
… is the second most common inborn error of the urea cycle first described in 1958. 49,5o It …

… Analysis of 100 samples can be achieved within 3 days. The described method offers a
possibility to determine 5… fluid with the same precision and capacity as do mass fragmentography …

… cis-trans isomers were subjected to mass fragmentography with determination of the ratio
319/… the following principles in the mass fragmentographic analysis of cholesterol and glucose. …

… accurate and precise method for determination … analysis of serum glucose (3), uric acid,
and urea suggested that the required accuracy should be obtainable by isotope dilution/mass …

… analysis can often be detected by using several ions in the mass fragmentographic analysis…
The ratio between the different ions must be specific for the compound to be determined. If …

… and urea by refluxing with benzene for 2.5 h; twice recrystalkzed from ethanol-water, 4: 1, v/v;
yield 70 %; correct elemental analysis) … , whereby the urea derivative dissolved compietely. …