2007-02-28 21:32:50 · 4 answers · asked by raz 1 in Science & Mathematics ➔ Chemistry
Benzidine is the trival name for 4,4'-diaminobiphenyl, a carcinogenic aromatic amine which has been used as part of a test for cyanide and also in the synthesis of dyes. It has been linked to bladder cancer.
In common with benzidine some other aromatic amines such as 2-aminonaphthalene have been withdrawn from use in almost all industries because they are so carcinogenic.
In the past a common test for blood used benzidine but this has largely been replaced by tests using phenolphthalein / hydrogen peroxide and luminol. An enzyme in blood causes the benzidine to be oxidized to a polymer which is blue coloured. The test for cyanide uses similar chemistry to give the blue colour.
Benzidine is a known human carcinogen.
2007-02-28 21:43:28 · answer #1 · answered by theanswerman 4 · 1⤊ 7⤋
why was blood give a positive in benzidine test ?
2013-09-19 05:23:12 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The answer above is a wikipedia entry.
Benzidine was used as a test for peroxidase. A positive is a blue or greenish color.
When Benzidine itself was found to be a class C carcinogen, the substituted 3,3',5,5'-tetramethyl-benzidine compound was used, but gave a slightly slower reaction.
Currently Luminol is used because it can be detected (in the dark) at lower concentrations.
2007-02-28 21:54:34 · answer #3 · answered by Richard 7 · 9⤊ 0⤋
Benzidine
2016-10-01 22:20:36 · answer #4 · answered by ? 4 · 0⤊ 0⤋