5-Amino-4-hydroxynaphthalene-1-sulfonic acid CAS 571-79-9
| CAS No. | 571-79-9 |
| Molecular Formula | C10H9NO4S |
| Molecular Weight | 239.25 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 5-Amino-4-hydroxynaphthalene-1-sulfonic 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.
5-Amino-4-hydroxynaphthalene-1-sulfonic acid (CAS 571-79-9), molecular formula C10H9NO4S and molecular weight 239.25 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 5-Amino-4-hydroxynaphthalene-1-sulfonic acid (C10H9NO4S) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C10H9NO4S |
| Molecular Weight | 239.25 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 | 1 |
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Recommended Standards
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- 6-(Methylsulfonyl)-1h-indole-2-carboxylic acid (CAS 383132-63-6)
- N-[3-(Acetylamino)-2,4-dimethylbenzyl]-2-chloroacetamide (CAS 519041-85-1)
- 2-(4-Chlorophenyl)-2-phenylethan-1-aminehydrochloride (CAS 21998-50-5)
- 4-(2,6-Dimethoxypyrimidin-4-yl)-N-(3-(trifluoromethyl)phenyl)piperazine-1-carboxamide (CAS 1021214-73-2)
- 4-Butyl-5-methyl-1,3-dihydro-2H-imidazole-2-thione (CAS 890091-92-6)
- 5-(Piperidin-4-ylmethyl)-3-(pyridin-4-yl)-1,2,4-oxadiazole (CAS 1239722-79-2)
- 1-Ethyl-4-ethynyl-1H-pyrazole (CAS 573982-81-7)
- ((3AR,6aR)-hexahydrocyclopenta[c]pyrrol-3a(1H)-yl)methanol (CAS 444193-01-5)
- 4-(Bromomethyl)-6-fluoro-2,4'-bipyridine (CAS 1227572-98-6)
- Dimethyl 1-(4-methoxyphenyl)-1H-1,2,3-triazole-4,5-dicarboxylate (CAS 4953-05-3)
- Semaglutide impurity 108 (CAS CATO-C4X-2226108)
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