Azithromycin CP Impurity Q CAS 99290-97-8
| CAS No. | 99290-97-8 |
| Molecular Formula | C37H66N2O12 |
| Molecular Weight | 730.93 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Azithromycin CP Impurity Q (CAS 99290-97-8), a pharmacopoeial impurity reference standard (molecular formula C37H66N2O12, MW 730.93 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Azithromycin CP Impurity Q (C37H66N2O12) is characterized by a nitrogen-containing heterocyclic scaffold, an amide 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).
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C37H66N2O12 |
| Molecular Weight | 730.93 g/mol |
| Purity | >95% |
| 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Nitrogen Atoms | 2 |
Related Azithromycin Standards
- Azithromycin CP Impurity R (CAS 161193-44-8)
- Azithromycin Impurity 23 (CAS CATO-C4X-100323)
- Azithromycin Impurity 50 (CAS CATO-C4X-100350)
- Azithromycin impurity 53 (CAS 152727-04-3)
- Azithromycin EP Impurity B (CAS 307974-61-4)
- Azithromycin EP Impurity A (CAS 76801-85-9)
- Azithromycin EP Impurity C (CAS 620169-47-3)
- Azithromycin EP Impurity I (CAS 172617-84-4)
Recommended Standards
- Erythromycin impurity 58 (CAS 145259-56-9)
- Erythromycin A 9,11-Iminoether (CAS CATO-C4X-100131)
- Erythromycin A 6,9-Iminoether (CAS CATO-C4X-100128)
- N-Despropyl Gamithromycin (10,13-Imino Ether) (CAS 145414-17-1)
- Ascorbic Acid Impurity 2 (CAS CATO-C4X-31442)
- Indocyanine Green Impurity 39 (CAS 2589435-65-2)
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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