Erythromycin EP Impurity E CAS 33396-29-1
| CAS No. | 33396-29-1 |
| Molecular Formula | C37H65NO12 |
| Molecular Weight | 715.91 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Erythromycin EP Impurity E (CAS 33396-29-1) is a certified pharmaceutical impurity reference standard with the molecular formula C37H65NO12 and a molecular weight of 715.91 g/mol.
Structurally, Erythromycin EP Impurity E (C37H65NO12) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 715.91 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.
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 | C37H65NO12 |
| Molecular Weight | 715.91 g/mol |
| Purity | >95% |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Nitrogen Atoms | 1 |
Related Erythromycin Standards
- Erythromycin EP Impurity D (CAS 23893-13-2)
- Erythromycin EP Impurity F (CAS 105882-69-7)
- Erythromycin Impurity 53 (CAS CATO-C4X-100153)
- Erythromycin B rearranged derivatives (CAS CATO-C4X-100170)
- Erythromycin C rearranged derivatives (CAS CATO-C4X-100171)
- Erythromycin thiocyanate impurity B rearranged derivative (CAS CATO-C4X-100174)
- Erythromycin B (CAS 527-75-3)
- Erythromycin EP Impurity B (CAS 992-62-1)
Recommended Standards
- 10,11-Anhydroerythromycin A (CAS 40554-78-7)
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- 2-(2-Amino-3-(difluoromethyl)-5-hydroxypyridin-4-yl)acetonitrile (CAS 1805330-47-5)
- 1-ethyl-3-methyl-4,5-dihydro-1H-pyrazol-5-one (CAS 19364-68-2)
- Lixisenatide (CAS 320367-13-3)
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