4-Amino-5-hydroxy-2,7-naphthalenedisulfonic Acid CAS 90-20-0
| CAS No. | 90-20-0 |
| Molecular Formula | C10H9NO7S2 |
| Molecular Weight | 319.31 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
4-Amino-5-hydroxy-2,7-naphthalenedisulfonic Acid (CAS 90-20-0), molecular formula C10H9NO7S2 and molecular weight 319.31 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C10H9NO7S2, 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic Acid contains a nitrogen-containing heterocyclic scaffold, 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 319.31 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
As a certified reference material (CRM), 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic Acid 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 | C10H9NO7S2 |
| Molecular Weight | 319.31 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 2 |
Related Amino Standards
- 4-Amino-5-hydroxynaphthalene-1,7-disulfonic acid (CAS 130-23-4)
- 1-Amino-8-naphthol-2,4-disulfonic acid (CAS 82-47-3)
- 2-Amino-5-hydroxynaphthalene-1,7-disulfonic acid (CAS 6535-70-2)
- 3-Amino-5-hydroxynaphthalene-2,7-disulfonic acid (CAS 90-40-4)
- 4-Amino-3-hydroxynaphthalene-2,7-disulfonic acid (CAS 2007-20-7)
- Methyl 4-amino-1-(2-methoxy-4-(methoxycarbonyl)benzyl)-1H-pyrazole-5-carboxylate (CAS 2410517-85-8)
- Methyl 6-amino-6-deoxy-2,3,4-tracetate-D-glucopyranoside (CAS 715649-25-5)
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