Bryan, George T. published the artcileA sensitive colorimetric method for the determination of urinary indoxyl sulfate (indican), HPLC of Formula: 2642-37-7, the publication is Analytical Biochemistry (1965), 10(1), 120-34, database is CAplus and MEDLINE.
A new, simple, rapid, and precise colorimetric method for urinary indoxyl sulfate (indican) was described. The method was based on preliminary column chromatography on a cation-exchange resin followed by diazotization and coupling. This method of analysis was compared with 2 other methods that have been used for indican analysis. It was found that 18 adult human subjects excreted 331 ± 144 micromoles (83 ± 36 mg.)/24 hrs. This quantity was several times greater than the amount generally believed to be present in human urine.
Analytical Biochemistry published new progress about 2642-37-7. 2642-37-7 belongs to indole-building-block, auxiliary class Indole,Salt,Sulfonate,Inhibitor,Inhibitor, name is Potassium 1H-indol-3-yl sulfate, and the molecular formula is C8H6KNO4S, HPLC of Formula: 2642-37-7.
Referemce:
https://www.nature.com/articles/s41429-020-0333-2,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles