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US 4,543,337 AGranted
Stabilizer for urea nitrogen color reagent
AssigneeTechnicon Instruments Corporation
InventorsSigrid G. Klotzsch, Richard Vadaszy
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Abstract
A storage stable diagnostic reagent for colorimetric determination of urea nitrogen, the reagent having enhanced sensitivity, and comprises a chromogenic agent, a color enhancer, and a cyothioamine, as well as method employing said reagent.
Claims8
A storage stable diagnostic reagent solution useful for the colorimetric determination of urea nitrogen in a urea-containing sample characterized by enhanced sensitivity and linearity which comprises
- (a) from about 0.02% to about 5.0% w/v of a chromogenic agent;
- (b) from about 0.001% to about 0.2% w/v of a color enhancer;
- and
- (c) an effective amount of up to about 0.5% w/v of a cyanothioamine of the formula:
- ##STR6## wherein R is alkyl;
- amino, mono- or dialkylamino, said alkyl having from 1 to 4 carbons;
- X is amino;
- n is 0, 1 or 2;
- and the thio salts thereof.
6 more elements
Dependencies are inferred from the claim text.