Ampicillin EP Impurity D CAS 32746-94-4
| CAS No. | 32746-94-4 |
| Molecular Formula | C16H21N3O5S |
| Molecular Weight | 367.42 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Ampicillin EP Impurity D 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.
As a process- or degradation-related impurity, Ampicillin EP Impurity D (CAS 32746-94-4, C16H21N3O5S) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Ampicillin EP Impurity D (C16H21N3O5S) contains a flavonoid 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.
Physical & Chemical Properties
| Molecular Formula | C16H21N3O5S |
| Molecular Weight | 367.42 g/mol |
| Purity | >90% |
| 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Nitrogen Atoms | 3 |
| Sulfur Atoms | 1 |
Related Ampicillin Standards
- Ampicillin Impurity 37 (CAS CATO-C4X-144337)
- Ampicillin Impurity 90 (CAS CATO-C4X-144390)
- Ampicillin Impurity 43 (CAS CATO-C4X-144343)
- Ampicillin Impurity 27 （Mixture of Diastereoisomer） (CAS CATO-C4X-144327)
- Ampicillin Impurity 38 (CAS CATO-C4X-144338)
- Ampicillin Impurity 82 (CAS CATO-C4X-144382)
- Ampicillin Impurity 94 (CAS CATO-C4X-144394)
- Ampicillin-d5 (CAS 1426173-65-0)
Recommended Standards
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- Polmacoxib D6 (CAS CATO-C4X-20411)
- Dopamine Impurity 116 (CAS CATO-C4X-1908116)
- Venetoclax Impurity 143 (CAS CATO-C4X-2495143)
- Lisinopril Impurity 28 (CAS 1207346-27-7)
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