Diagnostic reagent for the detection of leukocytes in body fluids and azo-ester dyes useful as chromogens therefor, process for their preparation and their use in the preparation of diagnostic reagents for the detection of leukocytes in body fluids

摘要

The invention relates to a diagnostic agent for the detection of leukocytes in body fluids, which consists of an absorbent carrier which is impregnated with an azo dye ester suitable as a chromogen, a suitable buffer substance and optionally with additional, customarily used auxiliaries. The invention further relates to the use of azo dye esters for producing the diagnostic agent according to the invention. Furthermore, the invention relates to new azo dye esters suitable as chromogens and their preparation. The azo dye esters according to the invention are prepared by reacting azo dyes which have free hydroxyl groups with appropriate acids or suitable reactive derivatives thereof in a manner known per se.