X-β-Galactoside (5-Bromo-4-chloro-3-indolyl-β-D-galactoside)

X-β-galactoside (5-Bromo-4-chloro-3-indolyl-β-D-galactopyranoside) is used as a chromogenic substrate for the detection of organisms capable of fermenting lactose (lac Z-positive organisms), and is not intended for use in the diagnosis of disease or other conditions in humans.

X-β-galactoside (5-Bromo-4-chloro-3-indolyl-β-D-galactopyranoside) is used as a chromogenic substrate for the detection of organisms capable of fermenting lactose (lac Z-positive organisms). In combination with IPTG (MC402), X-β-Galactoside can be used in transformation experiments involving Escherichia coli where disruption of the lac Z operon is used as a marker for DNA insertion.