Azithromycin impurity 51 CAS 194809-66-0
| CAS No. | 194809-66-0 |
| Molecular Formula | C37H69BN2O13 |
| Molecular Weight | 760.76 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 impurity 51 (CAS 194809-66-0), a pharmacopoeial impurity reference standard (molecular formula C37H69BN2O13, MW 760.76 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Azithromycin impurity 51 (C37H69BN2O13) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 4.5, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 760.76 g/mol, it falls into the high-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
As a certified reference material (CRM), Azithromycin impurity 51 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 | C37H69BN2O13 |
| Molecular Weight | 760.76 g/mol |
| Purity | >90% |
| 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) | 4.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2012 |
| Nitrogen Atoms | 2 |
Related Azithromycin Standards
- Azithromycin Impurity 28 (CAS CATO-C4X-100328)
- Azithromycin EP Impurity K (CAS 612534-95-9)
- Azithromycin EP Impurity F (CAS 612069-28-0)
- Azithromycin EP Impurity O (CAS 763924-54-5)
- Azithromycin N-Ethyl (CAS 92594-45-1)
- Azithromycin impurity 57 (CAS CATO-C4X-100357)
- Azithromycin EP Impurity L (CAS 90503-06-3)
- Azithromycin EP Impurity D (CAS 612069-26-8)
Recommended Standards
- Cefuroxime Impurity 111 (CAS CATO-C4X-1245111)
- (11bR,11'bR)-2,2'-[Oxybis(methylene)]bis[N,N-dimethyldinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin-4-amine] (CAS 869492-11-5)
- 5',5''''-(Naphthalene-1,4-diyl)bis(([1,1':3',1''-terphenyl]-4,4''-dicarboxylic acid)) (CAS 1816997-26-8)
- Korepimedoside A (CAS 106441-31-0)
- Colesevelam Impurity 7 (CAS CATO-C4X-28397)
- Apalutamide Impurity 18 (CAS CATO-C4X-274918)
- Lenvatinib Impurity 107 (CAS CATO-C4X-1140107)
- 5-Chloro-1-(4-fluorophenyl)-3-propyl-1H-pyrazole-4-carbaldehyde (CAS 1152977-66-6)
- 5-(Phenylethynyl)furan-2-carboxylic acid (CAS 130423-83-5)
- 6-chloropyrimidine-4-carbaldehyde (CAS 933702-16-0)
- 5-methyl-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylic acid (CAS 1159830-65-5)
- Methyl 2,4-dioxo-1,2,3,4-tetrahydropyrido[3,2-d]pyrimidine-6-carboxylate (CAS 1956332-21-0)
- 4-Amino-2-isopropyl-6-methylpyrimidine (CAS 4595-70-4)
- Insulin Degludec Impurity 6 (CAS CATO-C4X-21576)
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