Azorubin (E122) CAS 3567-69-9
| CAS No. | 3567-69-9 |
| Molecular Formula | C20H12N2O7S2 |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Azorubin (E122).
CATO supplies Azorubin (E122) (CAS 3567-69-9), a certified reference material (molecular formula C20H12N2O7S2Na, MW 479.43 g/mol) for analytical method development and quality control.
Structurally, Azorubin (E122) (C20H12N2O7S2Na) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 16.0, corresponding to approximately 16 ring(s) or double-bond equivalent(s). With a molecular weight of 479.43 g/mol, it falls into the moderately-high-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C20H12N2O7S2 2*Na |
| Molecular Weight | 479.43 g/mol |
| Purity | >85% |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 2 |
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- 4-Butoxy-2,3-dichlorophenol (CAS 1881291-83-3)
- Amlodipine impurity 9 (CAS CATO-C4X-10959)
- 3-Chloro-1,7-naphthyridin-8(7H)-one (CAS 1393575-76-2)
- 6-Amino-N,N-diethyl-9H-purine-9-carboxamide (CAS 89814-73-3)
- Neuropeptide Y (3-36) (porcine) trifluoroacetate salt (CAS 143863-88-1)
Why CATO?
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