| abstract |
A chromogenic compound found to be especially selective in the determination of calcium in blood of the general formula (I):n n where:n R is hydrogen or lower alkyl; X is CH₂, CH₂CH₂, CH=CH; O, S, SO₂, S-S, NR; W is CH, C-OH or N; M is p-nitrophenylazo, 2,4-dinitrophenylazo, 2,4, 6-trinitrophenylazo, p-nitrostyryl, p-benzoquinoneimino, bis-(4-dimethylaminophenyl) hydroxymethyl, 3-phenylisothiazolyl-5-azo, thiazolyl-5-azo; or isothiazolyl-5-azo; k is 0 or 1; l is 0 or 1; and n is 0 or 1. n A reagent composition and synthesis of chromogenic compounds of general formula (I) are also disclosed. |