Azobilirubin is a coloured compound formed by the oxidation of diazotized sulfanilic acid with

bilirubin Bilirubin (BR) (Latin for "red bile") is a red-orange compound that occurs in the normal catabolic pathway that breaks down heme in vertebrates. This catabolism is a necessary process in the body's clearance of waste products that arise from the ...

in the van den Bergh reaction. The quantity of bilirubin in patients with

jaundice Jaundice, also known as icterus, is a yellowish or greenish pigmentation of the skin and sclera due to high bilirubin levels. Jaundice in adults is typically a sign indicating the presence of underlying diseases involving abnormal heme met ...

can be determined by the formation of azobilirubin in the presence of methanol. The Van den Bergh chemical reaction which is used to measure bilirubin levels, couples bilirubin with diazotized sulfanilic acid. This reaction produced azo pigments, or azobilirubin. The presence of azobilirubin is best indicated by the emergence of a pink-purple color. The intensity of the color will also indicate how much bilirubin is in the blood. Color markers and indicators can be changed. Adding alkaline tartrate can make the purple azobilirubin into a blue azobilirubin. If we have high levels of bilirubin in the blood, the Van den Bergh chemical reaction is used to determine if the bilirubin is conjugated or unconjugated. Azobilirubin can also be used to determine how much conjugated bilirubin is the blood compared to that of unconjugated bilirubin. This process is done by using both forms of bilirubin alongside a diazo reagent and a caffeine-benzoate reagent. Conjugated bilirubin with the azo reagent will react, whilst the unconjugated bilirubin will not react with the azo reagent.

References

{{biochem-stub Tetrapyrroles