In chemistry, "'indoxyl "'is a nitrogenous substance with the chemical formula : C 8 H 7 NO . Indoxyl is isomeric with oxindol and is obtained as an oily liquid.
12.
In chemistry, "'indoxyl "'is a nitrogenous substance with the chemical formula : C 8 H 7 NO . Indoxyl is isomeric with oxindol and is obtained as an oily liquid.
13.
Plants can synthesise useful coloured dyes and pigments such as the anthocyanins responsible for the red colour of red wine, yellow woad used together to produce Lincoln green, indoxyl, source of the blue dye indigo traditionally used to dye denim and the artist's pigments gamboge and rose madder.
14.
The presence of an active ?-galactosidase can be detected by X-gal, a colourless analog of lactose that may be cleaved by ?-galactosidase to form 5-bromo-4-chloro-indoxyl, which then spontaneously dimerizes and oxidizes to form a bright blue insoluble pigment 5, 5'- dibromo-4, 4'- dichloro-indigo.
