Ursodeoxycholic Acid EP Impurity B CAS 81-25-4
| CAS No. | 81-25-4 |
| Molecular Formula | C24H40O5 |
| Molecular Weight | 408.57 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Ursodeoxycholic Acid EP Impurity B 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.
CATO supplies Ursodeoxycholic Acid EP Impurity B (CAS 81-25-4), a pharmacopoeial impurity reference standard (molecular formula C24H40O5, MW 408.57 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a steroid core, a hydroxyl group, an ether linkage, Ursodeoxycholic Acid EP Impurity B is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 408.57 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
Physical & Chemical Properties
| Molecular Formula | C24H40O5 |
| Molecular Weight | 408.57 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store at room temperature, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Ursodeoxycholic Standards
- Ursodeoxycholic Acid Impurity 113 (CAS CATO-C4X-1422113)
- Ursodeoxycholic Acid Impurity 132 (CAS CATO-C4X-1422132)
- Ursodeoxycholic Acid EP Impurity D (CAS 2955-27-3)
- Ursodeoxycholic Acid EP Impurity G (CAS 10538-55-3)
- Ursodeoxycholic acid impurity 63 (CAS 81873-91-8)
- Ursodeoxycholic Acid-d5 Methyl Ester (CAS 93701-19-0)
- Ursodeoxycholic acid impurity 55 (CAS CATO-C4X-142255)
- Ursodeoxycholic Acid Impurity 1 (CAS 4057-84-5)
Recommended Standards
- 3β-Cholic Acid (CAS 3338-16-7)
- Pregabalin impurity 100 (CAS CATO-C4X-1312100)
- Estradiol Impurity 32 (CAS CATO-C4X-163632)
- Calcipotriol EP Impurity E （and eantiomer） (CAS CATO-C4X-12225)
- Crisaborole lmpurity 81 (CAS CATO-C4X-202181)
- Linagliptin Impurity 11 (CAS 2279114-31-5)
- Resmetirom impurity 106 (CAS CATO-C4X-2912106)
- CyclopentylmethanamineHCl (CAS 58714-85-5)
- 2-(3-Chloro-2-methylphenyl)-1,3-dioxoisoindoline-5-carboxylic acid (CAS 356576-29-9)
- 6-(Aminomethyl)pyridin-2-amine trihydrochloride (CAS 380394-86-5)
- Methyl 2-chloro-5-(morpholine-4-sulfonyl)benzoate (CAS 445224-63-5)
- 1-Isobutyl-1H-benzo[d][1,2,3]triazole-5-carboxylic acid (CAS 1019342-95-0)
- 2,3-Dimethyl-4-oxo-4,5-dihydrofuro[3,2-c]pyridine-7-carboxylic acid (CAS 1956321-41-7)
- Tau Peptide (337-368) (Repeat 4 Domain) trifluoroacetate salt (CAS 330456-27-4)
Why CATO?
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