Allura Red Ac (E 129) CAS 25956-17-6
| CAS No. | 25956-17-6 |
| Molecular Formula | C18H14N2O8S2 |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Allura Red Ac (E 129) is closely related to a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
CATO supplies Allura Red Ac (E 129) (CAS 25956-17-6), a certified reference material (molecular formula C18H14N2O8S2Na, MW 473.43 g/mol) for analytical method development and quality control.
Based on its molecular formula C18H14N2O8S2Na, Allura Red Ac (E 129) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 473.43 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C18H14N2O8S2 2*Na |
| Molecular Weight | 473.43 g/mol |
| Purity | >80% |
| 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) | 13.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1964 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 2 |
Recommended Standards
- 2-Phenoxy-N-((4-(thiophen-2-yl)tetrahydro-2H-pyran-4-yl)methyl)acetamide (CAS 1202998-21-7)
- Butyl 6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carboxylate (CAS 300667-77-0)
- 2-(Diethylamino)benzonitrile (CAS 197507-52-1)
- 4-Iodo-1-((tetrahydrofuran-3-yl)methyl)-1H-pyrazol-5-amine (CAS 1247570-23-5)
- 3-(1-fluoro-2-methylpropan-2-yl)-1,2,4-oxadiazole-5-carboxylic acid (CAS 2925379-34-4)
- N,5-bis(4-methoxyphenyl)thiophene-2-carboxamide (CAS 344263-82-7)
- 1-(4-Ethoxy-3,5-dimethylphenyl)ethan-1-ol (CAS 1443340-25-7)
- Lithium 3-(1-methyl-1H-pyrazol-3-yl)propiolate (CAS 2044835-02-9)
- 7-(4-Methoxyphenyl)-[1,2,4]triazolo[4,3-a]pyrazine-3,8(2H,7H)-dione (CAS 1031577-95-3)
- Tirzepatide Impurity 1 (CAS 2460751-66-8)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com