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Differentiate slow lactose fermenters and non-fermenters. Demonstration of beta-galactosidase accomplished by hydrolization of substrate that liberates ortho-nitrophenol for a characteristic yellow color. Pack of 28 tablets per tube.
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MW 301.25 g/mol. β-galactosidase substrate for colorimetric and EIA applications. Hydrolysed by β-galactosidase to yield galactose and ortho-Nitrophenol, which is yellow in color.