Rifaximin Impurity 12 CAS CATO-C4X-150512
| CAS No. | CATO-C4X-150512 |
| Molecular Formula | C43H51N3O11 |
| Molecular Weight | 785.88 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Rifaximin Impurity 12.
Rifaximin Impurity 12 (CAS CATO-C4X-150512) is a certified pharmaceutical impurity reference standard with the molecular formula C43H51N3O11 and a molecular weight of 785.88 g/mol.
Based on its molecular formula C43H51N3O11, Rifaximin Impurity 12 contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 785.88 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C43H51N3O11 |
| Molecular Weight | 785.88 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°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) | 20.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 3 |
Related Rifaximin Standards
- Rifaximin (CAS 80621-81-4)
- Rifaximin Impurity B (CAS 1351775-03-5)
- Rifaximin EP Impurity G (CAS 80621-76-7)
- Rifaximin-d6(Major) (CAS 1262992-43-7)
- Rifaximin EP Impurity D (CAS CATO-C4X-15054)
- Rifaximin EP Impurity H (CAS 1210022-90-4)
- Rifaximin EP Impurity B (CAS 13929-35-6)
- Rifaximin EP Impurity F (CAS 14487-05-9)
Recommended Standards
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- Ozagrel Impurity 9 (CAS CATO-C4X-19719)
- Lornoxicam Impurity 72 (CAS CATO-C4X-201672)
- Revefenacin impurity 76 (CAS CATO-C4X-203176)
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- D-Ala18-Tirzepatide (CAS CATO-CPTD788916)
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