Cromoglicate EP Impurity A CAS 699-83-2
| CAS No. | 699-83-2 |
| Molecular Formula | C8H8O3 |
| Molecular Weight | 152.15 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Cromoglicate EP Impurity A (CAS 699-83-2), a pharmacopoeial impurity reference standard (molecular formula C8H8O3, MW 152.15 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C8H8O3, Cromoglicate EP Impurity A contains a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 152.15 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).
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.
Physical & Chemical Properties
| Molecular Formula | C8H8O3 |
| Molecular Weight | 152.15 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Cromoglicate Standards
- Sodium Cromoglicate Impurity 13 (CAS 53878-47-0)
- Sodium Cromoglicate Impurity 8 (CAS 16130-28-2)
- Sodium Cromoglicate Impurity 9 (CAS 3361-18-0)
- Sodium Cromoglicate Impurity 10 (CAS 50521-64-7)
- Sodium Cromoglicate Impurity C51 (CAS 16130-17-9)
- Sodium Cromoglicate Impurity 12 (CAS CATO-C4X-201112)
- Sodium Cromoglicate Impurity 6 (CAS 802857-44-9)
- Sodium Cromoglicate (CAS 15826-37-6)
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- 2-Chloroquinazoline-4-carbaldehyde (CAS 944903-02-0)
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Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com