Acid orange 156 CAS 68555-86-2
| CAS No. | 68555-86-2 |
| Molecular Formula | C21H19N4O5S |
| Molecular Weight | N/A |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Acid orange 156 (C21H19N4O5SNa) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
CATO supplies Acid orange 156 (CAS 68555-86-2), a certified reference material (molecular formula C21H19N4O5SNa, MW 462.46 g/mol) for analytical method development and quality control.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), Acid orange 156 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C21H19N4O5S Na |
| Molecular Weight | 462.46 g/mol |
| Purity | 97%+ |
| 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) | 14.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1976 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
Related Acid Standards
Recommended Standards
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- 11,13-Dimethyl-4-sulfanyl-8-thia-3,5,10-triazatricyclo[7.4.0.0^{2,7}]trideca-1(9),2,4,6,10,12-hexaen-6-ol (CAS 326891-39-8)
- 3-Bromo-5-(difluoromethyl)benzaldehyde (CAS 1646313-92-9)
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- Semaglutide Impurity 115 (CAS CATO-C4X-2226115)
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