Withanolide B CAS 56973-41-2
| CAS No. | 56973-41-2 |
| Molecular Formula | C28H38O5 |
| Molecular Weight | 454.60 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 454.60 g/mol gives Withanolide B distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Withanolide B (CAS 56973-41-2) is a high-purity analytical reference standard with the molecular formula C28H38O5 and a molecular weight of 454.60 g/mol.
The molecular framework of Withanolide B (C28H38O5) is characterized by a steroid 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 aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C28H38O5 |
| Molecular Weight | 454.60 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >75% |
| 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) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1973 |
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