IPTG Grade:ULTRA PURE GRADE CAS Number: 367-93-1Synonym(s): beta-D-Galactopyranoside, Isopropyl-beta-D-thiogalactopyranoside Molecular Weight: 238.31Molecular Formula: C9H18O5S Storage Condition: FROZEN CodeSizePriceQuantity 0487-1G 0487-10G 0487-100G Dioxane free. Commonly used inducer for beta-Galactosidase activity in many bacterial gene sequences controlled by the lac operon. and X-Gal are often used together to identify bacterial colonies containing recombinant plasmid DNA. Insoluble. Reaction Condition: Stocks: X-Gal 20 mg/ml in DMF; 20 mg/ml in water. Mix 4:1 (X-Gal/) for spreading onto agar plates prior to plating transformed bacteria.