| Bioactivity | Indigo carmine is an efficient reagent for the determination of ozone by chemlluminescence (CL)[1]. |
| Invitro | Indigo carmine in a 0.2% aqueous solution is blue at pH 11.4 and yellow at 13.0. Indigo carmine is also a redox indicator, turning yellow upon reduction[1]. |
| Name | Indigo carmine |
| CAS | 860-22-0 |
| Formula | C16H8N2Na2O8S2 |
| Molar Mass | 466.35 |
| Appearance | Solid |
| Transport | Room temperature in continental US; may vary elsewhere. |
| Storage | 4°C, sealed storage, away from moisture *In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture) |
| Reference | [1]. K Takeuchi, et al. Quantitative Determination of Aqueous-Phase Ozone by Chemiluminescence Using indigo-5,5'-disulfonate. Anal Chem. 1989 Mar 15;61(6):619-23. |