indigo

Indigo carmine (NSC-8646) is an indolesulfonic acid. It is used as a dye in renal function testing for the detection of nitrates and chlorates.

C.I. 73336 is an orange dye.

Indigo carmine (Standard) is the standard substance of Indigo carmine, and it is applicable for quantitative analysis, quality control, and related research in biochemical experiments. Indigo carmine (NSC-8646) is an indolesulfonic acid. It is used as a dye in renal function testing for the detection of nitrates and chlorates.

2,6-Dibromoquinone-4-chloroimide is a colorimetric dye for the detection of phenolic compounds. It produces an indigo dye upon reacting with phenolic compounds at a pH of approximately 9.4. 2,6-Dibromoquinone-4-chloroimide has been used as a Gibbs reagent for the colorimetric detection of phenolic compounds. It has also been used in chromogenic reactions for the quantitative colorimetric detection of aflatoxins, causing colorless aflatoxins to become green with an absorption band at 673 nm.

Vat Blue 2, a indigo derivative, is a dark blue 5,5'-dibromo-4,4'-dichloroindigo dye.

Purple-β-D-Gal, a chromogenic β-galactosidase substrate, undergoes enzymatic hydrolysis by intracellular β-galactosidase, yielding indoxyl molecules that oxidize and dimerize in situ to form water-insoluble indigo precipitates advantageous for β-galactosidase activity detection [1].