Quinizarin CAS 81-64-1
| CAS No. | 81-64-1 |
| Molecular Formula | C14H8O4 |
| Molecular Weight | 240.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Quinizarin (CAS 81-64-1), molecular formula C14H8O4 and molecular weight 240.21 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, Quinizarin (C14H8O4) contains a carboxylic acid group, a hydroxyl group, an ether linkage, a polycyclic aromatic system. The molecule exhibits a degree of unsaturation (DBE) of 11.0, corresponding to approximately 11 ring(s) or double-bond equivalent(s). With a molecular weight of 240.21 g/mol, it falls into the medium-molecular-weight range. 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).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
As a certified reference material (CRM), Quinizarin 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 | C14H8O4 |
| Molecular Weight | 240.21 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Recommended Standards
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- Anthraflavic Acid (CAS 84-60-6)
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- 2-(Cyclopropylmethoxy)-4,6-dimethylbenzonitrile (CAS 1710853-40-9)
- 1-Butyl-3-isopropyl-1H-pyrrole (CAS 91322-90-6)
- 5-(Hydroxymethyl)-2-(trifluoromethyl)benzaldehyde (CAS 1289209-36-4)
- 3-Bromo-4-fluoro-2-methoxyaniline (CAS 1257535-12-8)
- 2-Methyl-1H-naphtho[1,2-d]imidazol-5-amine (CAS 13727-97-4)
- 4-(Trifluoromethyl)oxazole-2-carboxylic Acid (CAS 1211580-23-2)
- 1-(4-Methylpyridin-2-yl)prop-2-en-1-one (CAS 1495721-07-7)
- Semaglutide Impurity 128 (CAS 2490269-78-6)
Why CATO?
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