Automated and manual direct methods for the determination of urea in blood or serum are
described. These methods determine urea by the colored product formed when urea, in …

A selected ion-monitoring method, incorporating an internal standard, was developed to
allow the direct and simultaneous measurement of stable isotopelabelled urea and …

A simple method for determination of urea in blood and urine with diacetyl
monoximeglucuronolactone reagent is presented. The stability of the color produced permits …

The study of urea metabolism In humans necessitates sen-sitive methods, so that very low
Isotopic enrichments of plasma or urinary urea can be measured. A stable derivative of urea …

We describe a method for determining uric acid in serum by reversed-phase liquid
chromatography with spectrophotometric detection at 280 nm. Serum, 100 ul is mixed with …

A method for the measurement of uric acid in human serum by isotope dilution-mass
spectrometry is described. The analytical procedure consists of the following Steps:(1) …

A new Isotope dilution mass spectrometrlc method for uric acid Is described. A known weight
of [1, 3-1sN2] urlc acid Is added to a known weight of serum, and the mixture Is allowed to …

The proposed isocratic liquid-chromatographic method for uric acid has good performance
characteristics. Results by this procedure and by an enzymic method for uric acid correlated …

The authors compared three urea nitrogen methods using six instruments:(1) the diacetyl
monoxime method used with a continuous flow analyzer Sequential Multiple Analyzer Model …

Summary o 1. An automated method for the determination of serum urate has been adapted
from a manual carbonate-phosphotungstic acid method. The method has been evaluated by …