This product has been discontinued. Alternate SKUs are 15520018, R0404 and B1690.


Catalog number:  AM9944

 Related applications:


Error loading your content!

  Catalog number
Select a plan
Unit size
Price ({{currency}}) Availability Qty
{{product.sku}} {{product.sku}} also known as {{product.formattedSku}} 
Pro add-ons

Your on-site stock

›› {{supplyCenter.scName}}({{scProduct.stockOnHand}} In stock)
›› {{supplyCenter.scName}}(Out of stock)
›› {{supplyCenter.scName}}
This item is not currently available on-site. Depending on your Supply Center settings you may be able to add the item to cart above else use the Order Non-Stocked Items' tab on the Supply Center home page.
Back to top


Ambion® X-GAL (5-Bromo-4-Chloro-3 Indolyl-Beta-D-thiogalactopyranoside) is a chromogenic substrate for Beta-galactosidase that turns blue upon hydrolysis and is regularly used for the blue/white color selection assay. Bacteria with a lac+ phenotype grow as blue colonies on plates containing X-GAL. Supplied in one bottle containing 1 g. X-GAL is assayed for efficiency of color development of lac+ colonies and the absence of undesirable inhibitors of cell growth by testing a range of concentrations (recommended is 40 µg/mL) after plating a constant cell number of E. coli harboring pUC19 grown on LB/carbenicillin plates. The plates are evaluated for color intensity, size, and number of colonies after an overnight incubation at 37°C.
For Research Use Only. Not for use in diagnostic procedures.


Cell Permeability: Cell-Permeant
Detection Method: Colorimetric
Product Line: Ambion™
Product Size: 1 g
Substrate: X-Gal
Substrate Properties: Chemical Substrate
Substrate Type: Beta-Gal Substrate
Shipping Condition: Room Temperature

Contents & storage

Store at –20°C.


Manuals & protocols