Alizarin Red S, Sodium Salt 72+% (Dye content)

Used in the biochemical assay to determine the presence of calcium. ||Synonyms:|3,4-Dihydroxy-9,10-dioxo-2-anthracenesulfonic acid sodium salt CI 58005||CAS No:|130-22-3||Molecular Formula:|C14H7O7SNa||Molecular Weight:|342.26||Purity:|≥72% (Dye content)||Appearance:|Brownish yellow powder||Visual Transition Range:|pH 4.3 (Brilliant yellow) to pH 6.3 (Pink)|pH 9.4 (Brown orange) to pH 12.0 (Violet)||Absorptivity:|λmax 595nm (0.1N NaOH): ≥320 |λmax 556nm (0.1N NaOH): ≥350||Loss on Drying (110°C):|≤5%||Solubility (1mg/ml in H2O):|Clear solution||Storage and Stability:|Powder may be stored at RT. Stable for 12 months at RT after receipt.