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Description
5-Bromo-4-chloro-3-indolyl-β-D-galactopyranoside is used as indigogenic substrate for β-galactosidase, for detection of β-galactosidase-positive clones, and the identification of lac and bacterial colonies or phage plaques.
It is a chromogenic substrate for β-galactosidase that produces a rich blue color that can easily be detected visually over background. X-Gal is the substrate of choice for blue-white selection of recombinant bacterial colonies with the lac+ genotype.
- Insertion of DNA into the lac Z region results in the loss of β-galactosidase activity
- Lac+ bacterial colonies resulting from a-complementation will appear blue
- Bacterial colonies containing plasmid with DNA inserted in the lac Z region will be incapable of a-complementation and will appear white
Specifications
Specifications
| Melting Point | 230°C (decomposition)(literature) |
| Quantity | 250 mg |
| Solubility Information | Soluble in DMF (2% w/v, clear and colorless solution). |
| Formula Weight | 408.6 |
| Physical Form | Powder |
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