Testosterone Impurity 18 CAS 1311972-89-0
| CAS No. | 1311972-89-0 |
| Molecular Formula | C21H32O |
| Molecular Weight | 300.48 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C21H32O, Testosterone Impurity 18 contains a steroid core, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 300.48 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).
Testosterone Impurity 18 (CAS 1311972-89-0) is a certified pharmaceutical impurity reference standard with the molecular formula C21H32O and a molecular weight of 300.48 g/mol.
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.
As a certified reference material (CRM), Testosterone Impurity 18 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 | C21H32O |
| Molecular Weight | 300.48 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1990 |
Related Testosterone Standards
- Testosterone Impurity 19 (CAS CATO-C4X-132619)
- Testosterone Impurity 20 (CAS CATO-C4X-132620)
- Testosterone EP Impurity J (CAS 57144-06-6)
- Testosterone Impurity 19 (CAS 2243-06-3)
- Testosterone Impurity N16 (CAS 24704-84-5)
- Testosterone Impurity 65 (CAS 570-94-5)
- Testosterone Impurity 54 (CAS CATO-C4X-243254)
- Testosterone Impurity 66 (CAS 95369-50-9)
Recommended Standards
- Cholic Acid Impurity 30 (CAS 1093397-66-0)
- Abiraterone Impurity 81 (CAS 2118-31-2)
- 18-Hydroxyoctadecanoic acid (CAS 3155-42-8)
- 2-Hydroxyethyl Palmitate (CAS 4219-49-2)
- Riociguat Impurity N3 (CAS 2512205-25-1)
- Loratadine Impurity 93 (CAS CATO-C4X-142693)
- Avatrombopag Impurity 22 (CAS CATO-C4X-223422)
- 3-(4-Fluorophenyl)-6-((pyridin-2-ylmethyl)thio)pyridazine (CAS 872695-09-5)
- 1-(4-Fluorophenyl)-3-methylbutan-1-amine (CAS 2285-92-9)
- 4-Chloro-2,5-dimethylbenzaldehyde (CAS 866490-24-6)
- 2-Amino-N-(4-ethoxyphenyl)benzamide (CAS 19562-43-7)
- Tofacitinib Impurity 147 (CAS CATO-C4X-1079147)
- 4,4'-Bis((E)-2-(9-ethyl-9H-carbazol-3-yl)vinyl)-1,1'-biphenyl (CAS 475480-90-1)
- Pancreatic Polypeptide (human) trifluoroacetate salt (CAS 75976-10-2)
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