X-Gal White solid. PROTECT FROM LIGHT. PROTECT FROM MOISTURE. A chromogenic substrate for b-galactosidase. Used to distinguish between recombinant and non-recombinant plasmids carrying b-galactosidase gene (e.g. pUR222). Purity: ≥99% by HPLC. CAS 7240-90-6. Ref.: Engler, K.H., et al. 1999. J. Microbiol. Methods 35, 207. Arakawa, H., et al. 1991. Anal. Biochem. 199, 238. Horwitz, J., et al. 1964. J. Med. Chem. 7, 574. |