| abstract |
An enzyme test reagent comprises a substance capable of reacting with the enzyme to give rise to the formation of a compound of formula XAY-NO2, where A comprises an aromatic ring, X comprises an auxochromic group and Y comprises a unsaturated group capable of transmitting the resonance of electrons between the aromatic nucleus and the nitro substituent, said compound being capable of producing a visual signal easily perceptible to the eye. |