Pigment Red 57 CAS 5281-04-9
| CAS No. | 5281-04-9 |
| Molecular Formula | C18H12N2O6S |
| 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 Pigment Red 57.
Pigment Red 57 (CAS 5281-04-9) is a high-purity analytical reference standard with the molecular formula C18H12N2O6SCa and a molecular weight of 424.44 g/mol.
Based on its molecular formula C18H12N2O6SCa, Pigment Red 57 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 424.44 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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.
As a certified reference material (CRM), Pigment Red 57 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 | C18H12N2O6S Ca |
| Molecular Weight | 424.44 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) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Pigment Standards
Recommended Standards
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- 4-Chloro-2-(2-fluoro-phenyl)-6-methyl-quinazoline (CAS 885277-53-2)
- Azelastine-d3 (CAS 758637-88-6)
- [(Methylthio)[[2-nitro-5-(propylthio)phenyl]amino]methylene]carbamic Acid Methyl Ester (CAS 88255-00-9)
- Methyl (tetrahydro-2H-pyran-4-yl)glycinate (CAS 1156837-33-0)
- 1-Bromo-3-ethoxycyclobutane (CAS 1494509-87-3)
- 3-[4-(5-hydroxypentoxy)-1-oxo-isoindolin-2-yl]piperidine-2,6-dione (CAS 2619512-79-5)
- Peptide Impurity 15 (CAS 1227750-69-7)
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