IPTG is a carbohydrate used to induce b-galactosidase for the selection of recombinant plasmids. Used to select for lac Y mutants and to induce the lac operon in E. coli. IPTG will also induce the cellular content of lactose permease. It is used in conjunction with X-Gal or Bluo-Gal in blue-white selection of recombinant bacterial colonies that induce expression of the lac operon in E. coli. Solubility: Colorless, clear, complete Identity (IR): Conforms to structure pH (5%): 5.0-7.0 Dioxane: Not Detected Specific Rotation (C=1,H2O): -29° to -35° Melting Point: 109 -114.0°C Water (KF): ≤1.0% Blue-White Assay: Induces b-galactosidase in a pUC 18-containing strain. Storage and Stability: Powder is very stable at RT. Stable for 12 months after receipt. For long-term storage of reconstituted product, aliquot and store at -20°C. Further dilutions can be made in assay buffer.