Piroxicam Impurity 28 CAS 112391-26-1
| CAS No. | 112391-26-1 |
| Molecular Formula | C9H7NO5S |
| Molecular Weight | 241.22 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C9H7NO5S, Piroxicam Impurity 28 contains a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 241.22 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).
CATO supplies Piroxicam Impurity 28 (CAS 112391-26-1), a pharmacopoeial impurity reference standard (molecular formula C9H7NO5S, MW 241.22 g/mol) used for the identification and quantification of trace impurities in APIs.
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.
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 | C9H7NO5S |
| Molecular Weight | 241.22 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1989 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Piroxicam Standards
- Piroxicam Impurity 26 (CAS 1942748-12-1)
- Piroxicam EP Impurity C (CAS 24683-25-8)
- Piroxicam impurity 22 (CAS 88741-92-8)
- Piroxicam EP Impurity D (CAS 6639-62-9)
- Piroxicam EP Impurity G (CAS 35511-14-9)
- Piroxicam EP Impurity J (CAS 35511-15-0)
- Piroxicam EP Impurity E (CAS 24683-20-3)
- Piroxicam EP Impurity H (CAS 24683-21-4)
Recommended Standards
- Flurbiprofen Impurity 60 (CAS 78543-07-4)
- (2S,4R)-4-(3,4-Difluorobenzyl)-pyrrolidine-2-carboxylic acid (CAS 1049743-09-0)
- Enzalutamide Impurity 6 (CAS 1332524-02-3)
- (2S,4R)-4-(3,4-Difluorobenzyl)pyrrolidine-2-carboxylic acid (CAS 1049981-46-5)
- Maribavir Impurity 26 (CAS 176161-47-0)
- Linagliptin Impurity 17 (CAS 6140-11-0)
- Olaparib Impurity 107 (CAS CATO-C4X-1135107)
- 2,5-Dibromo-n-(thiophen-2-ylmethyl)benzenesulfonamide (CAS 848336-24-3)
- 4,5-Dihydro-1-(3-Fluorophenyl)-1,4-Epoxy-1H,3H-(1,4)Oxazepino(4,3-a)Benzimidazole (CAS 76099-10-0)
- 25212-74-2 NSC-170908 NSC170908 Poly(thio-1,4-phenylene) (CAS 25212-74-2)
- Gatifloxacin Impurity 14 (CAS 114213-69-3)
- 1-cyclopentylethan-1-amine (CAS 38118-79-5)
- 5-(phenylsulfonyl)thiophene-2-carboxylic acid (CAS 5324-78-7)
- Neuropeptide S (human) (CAS 412938-67-1)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com