Bismarck brown Y

  • 4,4 ' - [1,3 - phenylene bis ( azo) ] bis [1,3 - phenyldiamine ] (IUPAC)
  • Vesuvin
  • CI Basic Brown 1
  • C. I. 21000

Template: Infobox chemical / molecular formula search available

Bismarck brown Y or vesuvin is a dye from the group of basic ( cationic ) azo dyes. Was named the dye after Otto von Bismarck, the kingdom 's founder and first Chancellor of the German Empire. It was discovered in 1863 by Carl Alexander von Martius as the first diazo dye.

Properties

Bismarck brown Y has an absorption maximum at 463 nm in water. It is 1-5% (w / v ) in water, 1-3% (w / v ) in ethanol and 7% ( w / v) soluble in ethylene glycol. Its pKa value is 5

Use

Bismarck brown found in the leather, paper and wood dyeing and for the synthesis of polyazo use. In addition, it is used in botany for staining of plant cell walls and in microbiology for staining bacteria in a modified Gram stain. Robert Koch was able to prove with Bismarck brown tubercle bacilli.

Bismarck brown R

The related with Bismarck brown Y Bismarck brown R ( Bismarck Brown 4, CI 21010 ) differs by only three methyl groups. It has a redder hue compared to Bismarck Brown Y, but otherwise has the same staining properties. It was also used in acrylamide gels, in order to optimize the staining of proteins.

Bismarck Brown G

In Bismarck Brown G, a dye mixture, Bismarck Brown Y occurs predominantly.

127394
de