Carbidopa Impurity 28 CAS CATO-C4X-231028
| CAS No. | CATO-C4X-231028 |
| Molecular Formula | C19H20N2O7 |
| Molecular Weight | 388.37 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Carbidopa Impurity 28 (CAS CATO-C4X-231028), a pharmacopoeial impurity reference standard (molecular formula C19H20N2O7, MW 388.37 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Carbidopa Impurity 28 (C19H20N2O7) is characterized by a flavonoid core, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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.
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 | C19H20N2O7 |
| Molecular Weight | 388.37 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | ＞95% |
| 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 2 |
Related Carbidopa Standards
- Carbidopa Impurity 21 (CAS CATO-C4X-231021)
- Carbidopa Impurity 23 (CAS CATO-C4X-231023)
- Carbidopa Impurity 30 (CAS CATO-C4X-231030)
- Carbidopa Impurity 26 (CAS CATO-C4X-231026)
- Carbidopa Impurity 18 (CAS CATO-C4X-231018)
- Carbidopa Impurity 34 (CAS CATO-C4X-231034)
- Carbidopa Impurity 32 (CAS CATO-C4X-231032)
- Carbidopa EP Impurity D (CAS 934371-48-9)
Recommended Standards
- Podophyllotoxin impurity 4 (CAS 138456-91-4)
- Aranidipine (CAS 86780-90-7)
- Ferulic Acid Impurity 4 (CAS 135820-01-8)
- Pamoic Acid (CAS 130-85-8)
- Cefoperazone Impurity 45 (CAS 16681-77-9)
- Safinamide Impurity 62 (CAS CATO-C4X-159062)
- Amikacin Impurity B (CAS 927821-99-6)
- Ethyl 3-imino-2-(propan-2-yl)-2,3-dihydro-1h-pyrazole-4-carboxylate (CAS 1365623-60-4)
- 1-((1H-Imidazol-1-yl)methyl)-1H-benzo[d]imidazole (CAS 159064-01-4)
- 4-Bromo-3,5-dichlorobenzonitrile (CAS 1160574-40-2)
- Boc-Cit-ONp (CAS 56612-88-5)
- N-(3-(1H-Imidazol-1-yl)propyl)naphthalene-2-sulfonamide (CAS 313960-73-5)
- 134476-74-7 C30H48O3 Richenoic acid W2447 (CAS 134476-74-7)
- Semaglutide Impurity 10 (CAS CATO-C4X-222610)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com