Budesonide Impurity 81 CAS CATO-C4X-138981
| CAS No. | CATO-C4X-138981 |
| Molecular Formula | C21H28O7 |
| Molecular Weight | 392.44 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.
Budesonide Impurity 81 (CAS CATO-C4X-138981) is a certified pharmaceutical impurity reference standard with the molecular formula C21H28O7 and a molecular weight of 392.44 g/mol.
The molecular framework of Budesonide Impurity 81 (C21H28O7) is characterized by a flavonoid core, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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).
As a certified reference material (CRM), Budesonide Impurity 81 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.
Physical & Chemical Properties
| Molecular Formula | C21H28O7 |
| Molecular Weight | 392.44 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
Related Budesonide Standards
- Budesonide Impurity 21 (CAS 85234-64-6)
- Budesonide impurity 44 (CAS CATO-C4X-138944)
- Budesonide Impurity 14 (CAS 5541-37-7)
- Budesonide Impurity 16 (CAS 3044-42-6)
- Budesonide Impurity 30 (CAS 1234572-34-9)
- Budesonide Impurity 79 (Z-Isomer) (CAS 118866-09-4)
- Budesonide Impurity 36 (CAS 77017-20-0)
- Budesonide Impurity N22 (CAS 82423-35-6)
Recommended Standards
- Ezetimibe Impurity 147 (3R,4R) (CAS CATO-C4X-1098147)
- Latamoxef Impurity 20 (CAS CATO-C4X-179820)
- H96WTV8SM2 477-33-8 Samidin Crotonic acid, 3-methyl-, 9-ester with 9,10-dihydro-9,10-dihydroxy-8,8-dimethyl-2H,8H-benzo(1,2-b:3,4-b')-dipyran-2-one acetate (+)-Samidin UNII-H96WTV8SM2 (CAS 477-33-8)
- Hybutimibe Impurity 1 (CAS CATO-C4X-25051)
- 7-ACCA Impurity 10 (CAS CATO-C4X-231310)
- Fluvastatin EP Impurity C(Sodium Salt) (CAS 2451176-31-9 (free acid))
- Selumetinib Impurity 4 (CAS CATO-C4X-30534)
- Terbinafine Impurity 47 (CAS CATO-C4X-133847)
- (2E)-1-(2-Methoxyphenyl)-3-(3-methylphenyl)prop-2-en-1-one (CAS 1176514-42-3)
- 2-Methyl-3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2H-indazole (CAS 1632159-69-3)
- 2-(Fluoromethyl)-6-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (CAS 1321518-09-5)
- 3-(tert-Butyl)isoxazole-5-carboxylic acid (CAS 133674-40-5)
- Lithium borodeuteride (CAS 15246-28-3)
- Insulin Degludec Impurity 15 (CAS CATO-C4X-215715)
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