Fluorescein-PEG6-bis-NHS ester CAS 2055105-59-2
| CAS No. | 2055105-59-2 |
| Molecular Formula | C44H50N4O17S |
| Molecular Weight | 938.95 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C44H50N4O17S, Fluorescein-PEG6-bis-NHS ester 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 938.95 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 Fluorescein-PEG6-bis-NHS ester (CAS 2055105-59-2), a certified reference material (molecular formula C44H50N4O17S, MW 938.95 g/mol) for analytical method development and quality control.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C44H50N4O17S |
| Molecular Weight | 938.95 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 22.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1997 |
| Nitrogen Atoms | 4 |
| Sulfur Atoms | 1 |
Related Fluorescein Standards
- Fluorescein-6-carbonyl-Val-Asp(OMe)-Val-Ala-DL-Asp(OMe)-fluoromethylketone (N-1950.1000) (CAS 1926163-70-3)
- Fluorescein-6-carbonyl-Leu-Glu(OMe)-His-DL-Asp(OMe)-fluoromethylketone (N-1910.0500) (CAS 1926163-67-8)
- Fluorescein-6-carbonyl-Asp(OMe)-Glu(OMe)-Val-DL-Asp(OMe)-fluoromethylketone (CAS 1926163-65-6)
- Fluorescein-dUTP (CAS 214154-36-6)
- Fluorescein-6-carbonyl-Tyr-Val-Ala-DL-Asp(OMe)-fluoromethylketone (CAS 1926163-69-0)
- Fluorescein mercuric acetate (CAS 3570-80-7)
- FMA-Fluorescein Mercuric Acetate (CAS 32382-27-7)
- Fluorescein alkynylamino-ATP - 1.0 mM solution (CAS 185971-89-5)
Recommended Standards
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- Ac-Arg-Tyr-Tyr-Arg-Ile-Lys-NH2 (CAS 200959-48-4)
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