Sulfasalazine Impurity 2 (RRT 0.75) CAS 139-56-0
| CAS No. | 139-56-0 |
| Molecular Formula | C13H11N3O5S |
| Molecular Weight | 321.31 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Sulfasalazine Impurity 2 (RRT 0.75) (CAS 139-56-0), a pharmacopoeial impurity reference standard (molecular formula C13H11N3O5S, MW 321.31 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage, Sulfasalazine Impurity 2 (RRT 0.75) is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 321.31 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
As a certified reference material (CRM), Sulfasalazine Impurity 2 (RRT 0.75) 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 | C13H11N3O5S |
| Molecular Weight | 321.31 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°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) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related Sulfasalazine Standards
- Sulfasalazine EP Impurity I (CAS 21542-82-5)
- Sulfasalazine EP Impurity I (CAS 1310803-27-0)
- Sulfasalazine Impurity 14 (CAS 330833-91-5)
- Sulfasalazine EP Impurity C (CAS 66030-25-9)
- Sulfasalazine Impurity 20 (CAS CATO-C4X-141920)
- Sulfasalazine Impurity 24 (CAS 409357-24-0)
- Sulfasalazine Impurity 27 (CAS 501111-03-1)
- Sulfasalazine Impurity 20 (CAS 302584-09-4)
Recommended Standards
- 3-(5-(Benzo[d][1,3]dioxol-5-ylcarbamoyl)-1,3,4-thiadiazol-2-yl)propanoic acid (CAS 1142209-53-7)
- 1-(6-(4-Fluorophenyl)indolizin-3-yl)-1H-pyrazole-3-carboxylic acid (CAS 1422138-42-8)
- Methocarbamol Impurity 3 (CAS CATO-C4X-24443)
- ((3AR,6S,6aS)-6-(6-amino-9H-purin-9-yl)-5-fluoro-2,2-dimethyl-6,6a-dihydro-3aH-cyclopenta[d][1,3]dioxol-4-yl)methanol (CAS 805245-45-8)
- Oxacillin Impurity 9 (CAS CATO-C4X-23219)
- Sofosbuvir Impurity 15 (CAS CATO-C4X-105215)
- Clopidogrel Impurity 39 (CAS 2418591-11-2)
- 7-Amino-2-azaspiro[4.4]nonan-3-one hydrochloride (CAS 2173991-79-0)
- 4-Ethyl-5-(thiophen-2-ylmethyl)-4H-1,2,4-triazole-3-thiol (CAS 667435-85-0)
- 2-((3-Ethyl-4-oxo-3,4-dihydroquinazolin-2-yl)thio)-N-(4-fluorophenyl)acetamide (CAS 329929-16-0)
- Olmesartan N2-Trityl Anhydro Acid (CAS 1797891-24-7)
- (2-Methoxyphenyl)(5-methyl-1,3,4-oxadiazol-2-yl)methanamine (CAS 1082497-11-7)
- (3-Methylbenzyl)triphenylphosphonium chloride (CAS 63368-37-6)
- Semaglutide Impurity 5 (CAS 23406-82-8)
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