Ascorbic Acid Impurity 43 CAS 20229-76-9
| CAS No. | 20229-76-9 |
| Molecular Formula | C8H10O7 |
| Molecular Weight | 218.16 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Ascorbic Acid Impurity 43 (CAS 20229-76-9), a pharmacopoeial impurity reference standard (molecular formula C8H10O7, MW 218.16 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a carbohydrate-derived structure, Ascorbic Acid Impurity 43 is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 218.16 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
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 | C8H10O7 |
| Molecular Weight | 218.16 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°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) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
Related Ascorbic Standards
- D-Ascorbic Acid Impurity 19 (CAS 67776-07-2)
- Ascorbic Acid EP Impurity D (CAS 3031-98-9)
- Ascorbic Acid EP Impurity H (CAS 122046-79-1)
- Ascorbic Acid EP Impurity C (CAS 526-98-7)
- Ascorbic Acid EP Impurity G (CAS 66757-69-5)
- Ascorbic acid 13C6 (CAS 1354064-87-1)
- L-Ascorbic Acid-13C6 (CAS 1331939-77-5)
- L-Ascorbic acid 2-phosphate xsodium salt (CAS 109620-90-8)
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