formazan

<chemical> A water-insoluble coloured azo compound of the general structure, RNH-N==CR'-N==NR', formed by reduction of a tetrazolium salt in the histochemical demonstration of oxidative enzymes ... Employing this reaction, oxidoreductase activity can be determined quantitatively in tissue sections by allowing the enzymes to act on their speci...
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formazan

Type: Term Pronunciation: fōr′mă-zan Definitions: 1. A water-insoluble colored compound of the general structure, RNH—N=CR′—N=NR″, formed by reduction of a tetrazolium salt in the histochemical demonstration of oxidative enzymes; the R's are usually phenyl groups; examples include neotetrazolium, blue tetrazolium, an...
Found on http://www.medilexicon.com/medicaldictionary.php?t=34858

Formazan

Formazan dyes are artificial chromogenic products of the reduction of tetrazolium salts by dehydrogenases and reductases. They have a variety of colors from dark blue to deep red to orange, depending on the original tetrazolium salt used as the substrate for the reaction. Leading examples of tetrazolium salts include: When reduced in a cell, eithe...
Found on http://en.wikipedia.org/wiki/Formazan
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