Cephalexin Impurity 33 CAS 883835-57-2
| CAS No. | 883835-57-2 |
| Molecular Formula | C9H12O3S |
| Molecular Weight | 200.25 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Cephalexin Impurity 33 (CAS 883835-57-2) is a certified pharmaceutical impurity reference standard with the molecular formula C9H12O3S and a molecular weight of 200.25 g/mol.
The molecular framework of Cephalexin Impurity 33 (C9H12O3S) is characterized by a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional 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 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.
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 | C9H12O3S |
| Molecular Weight | 200.25 g/mol |
| Purity | >95% |
| Storage | Store in a cool place (≤25°C), keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Sulfur Atoms | 1 |
Related Cephalexin Standards
- Cephalexin Impurity 34 (CAS CATO-C4X-126134)
- Cephalexin Impurity 27 (CAS CATO-C4X-126127)
- Cephalexin Impurity 28 (CAS 142975-48-2)
- Cephalexin Impurity 35 (CAS CATO-C4X-126135)
- Cephalexin Impurity 20 (CAS CATO-C4X-126120)
- Cephalexin Impurity 12 (CAS 65870-52-2)
- Cephalexin Impurity 18 (CAS 34632-04-7)
- Cephalexin Impurity 25 (CAS CATO-C4X-126125)
Recommended Standards
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- 8-Acetoxypentadeca-1,9Z-Diene-4,6-Diyn-3-Ol (CAS 41682-30-8)
- 1-Allyl-2-imino-N-(2-morpholinoethyl)-5-oxo-2,5-dihydro-1H-dipyrido[1,2-a:2',3'-d]pyrimidine-3-carboxamide (CAS 618383-59-8)
- Tirzepatide Impurity 22 X TFA Salt (CAS CATO-C4X-324022)
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