DIAGNOSTIC COMPOSITION FOR THE DETECTION OF LEUKOCYTES IN BODY FLUIDS, SULFOPHTHALEIN ESTERS AS CHROMOGENS USED FOR THIS COMPOSITION, METHOD OF THEIR PREPARATION AND THEIR USE FOR PREPARING DIAGNOSTIC COMPOSITIONS

摘要

Diagnostic agent for the detection of leukocytes in body fluids, comprising an absorbent carrier which is impregnated with a chromogen and a buffer substance, wherein the chromogen is a sulfonphthalein ester of the formula wherein R1 is a carboxylic acid residue optionally substituted by halogen or lower alkoxy; or is an amino acid or peptide residue having a nitrogen protective group; R2 is a halogen atom or a lower alkyl radical; and R3 and R4 are individually selected from hydrogen and halogen. Certain of the chromogen are provided as novel compounds.