Alanyl Glutamine Impurity 33 CAS 21064-18-6
| CAS No. | 21064-18-6 |
| Molecular Formula | C8H14N2O5 |
| Molecular Weight | 218.21 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.
As a process- or degradation-related impurity, Alanyl Glutamine Impurity 33 (CAS 21064-18-6, C8H14N2O5) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Structurally, Alanyl Glutamine Impurity 33 (C8H14N2O5) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 3.0, corresponding to approximately 3 ring(s) or double-bond equivalent(s). With a molecular weight of 218.21 g/mol, it falls into the medium-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.
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 | C8H14N2O5 |
| Molecular Weight | 218.21 g/mol |
| Appearance | White to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | >90% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1963 |
| Nitrogen Atoms | 2 |
Related Alanyl Standards
- Alanyl Glutamine Impurity 3 (CAS CATO-C4X-19743)
- Alanyl Glutamine Impurity 4 (CAS CATO-C4X-19744)
- Alanyl Glutamine Impurity 7 (CAS CATO-C4X-19747)
- Alanyl Glutamine Impurity 28 (CAS CATO-C4X-197428)
- L-Alanyl-L-glutamine (CAS 39537-23-0)
- Alanyl Glutamine Impurity 31 (CAS 656221-79-3)
- L-Alanyl-D-glutamine (CAS 281660-34-2)
- D-Alanyl-L-glutamine (CAS 205252-36-4)
Recommended Standards
- Phenobarbital Impurity 5 (CAS 5909-45-5)
- Phenobarbital EP Impurity C (CAS 76-94-8)
- Cytarabine Impurity 25 (CAS CATO-C4X-200525)
- Cephalexin Impurity 28 (CAS 142975-48-2)
- Cefcapene Impurity 55 (CAS CATO-C4X-182455)
- Obeticholic Acid Impurity 16 (CAS CATO-C4X-115316)
- Piracetam impurity 38 (CAS CATO-C4X-123538)
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