Ceftazidime Impurity 44 CAS 2259869-88-8
| CAS No. | 2259869-88-8 |
| Molecular Formula | C23H17N5O3S5 |
| Molecular Weight | 571.74 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of Ceftazidime Impurity 44 is closely related to a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
Ceftazidime Impurity 44 (CAS 2259869-88-8) is a certified pharmaceutical impurity reference standard with the molecular formula C23H17N5O3S5 and a molecular weight of 571.74 g/mol.
Ceftazidime Impurity 44 (C23H17N5O3S5) contains a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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), Ceftazidime Impurity 44 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 | C23H17N5O3S5 |
| Molecular Weight | 571.74 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) | 18.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1998 |
| Nitrogen Atoms | 5 |
| Sulfur Atoms | 5 |
Related Ceftazidime Standards
- [2H6]-Ceftazidime sodium salt (CAS CATO-C4X-121239)
- Ceftazidime Impurity 109 (CAS CATO-C4X-1212109)
- Ceftazidime Oxide Impurity 1 (CAS CATO-C4X-121211)
- Ceftazidime Oxide Impurity 2 (CAS CATO-C4X-121212)
- Ceftazidime Impurity 19 (CAS CATO-C4X-121219)
- Ceftazidime Impurity 29 (CAS CATO-C4X-121229)
- Ceftazidime EP Impurity H (CAS 1354396-23-8)
- Ceftazidime-d5 (CAS CATO-CCAD303625)
Recommended Standards
- (10E)-3-O-De(a-L-cladinose)-10-dehydro-11-dehydroxy-6-O-methyl-erythromycin (CAS 198782-59-1)
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- Ezetimibe Impurity 120 (CAS 1197343-09-1)
- Pemafibrate Impurity 98 (CAS CATO-C4X-290398)
- Elagolix Impurity N20 (CAS 1311320-17-8)
- Pimobendan Impurity 9 (CAS CATO-C4X-24619)
- Erlotinib Impurity 107 (CAS 299912-59-7)
- 3-[3-Chloro-5-(trifluoromethyl)pyridin-2-yl]-1-(morpholin-4-yl)propan-1-one (CAS 337920-45-3)
- N-[3-(1H-1,3-Benzodiazol-2-yl)-1H-pyrazol-4-yl]acetamide (CAS 825615-93-8)
- N1-benzyl-N1,N3-dimethylpropane-1,3-diamine (CAS 60630-68-4)
- 5-Bromo-2,3-difluoro-4-(trimethylsilyl)benzoic acid (CAS 1241948-58-2)
- 1-(3,7-Bis(dimethylamino)-10H-phenothiazin-10-yl)ethan-1-one (CAS 3763-06-2)
- 261952-08-3 2-methyl-5-(trifluoromethyl)benzoyl Chloride DTXSID20379609 (CAS 261952-08-3)
- Insulin Degludec Impurity 19 (CAS CATO-C4X-215719)
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