Phentolamine mesylate: alpha-adrenergic antagonist (imidazoline).
Phentolamine mesylate testing at Vanguard Laboratory: identity, purity and quantity $250 per sample, with results in 3 to 5 business days.
Phentolamine mesylate: 2D structure drawn from the PubChem record (CID 91430).
65-28-1
C17H19N3O · CH4O3S
377.46 g/mol
Alpha-adrenergic antagonist (imidazoline)
Identity: Phentolamine mesylate
IUPAC name: 3-[N-(4,5-dihydro-1H-imidazol-2-ylmethyl)-4-methylanilino]phenol;methanesulfonic acid
Method for the $250 identity, purity and quantity test: HPLC-UV purity and assay, LC-MS identity, against a reference standard, with results in 3 to 5 business days.
The USP monograph covers identity by infrared and UV spectroscopy and HPLC retention time, assay by HPLC, organic impurities by HPLC, and sulfate, loss on drying and residue on ignition. Full testing to the USP Phentolamine Mesylate monograph is available and quoted.
Chromatographic purity and mg per unit by the method matched to the compound, identity against a reference standard. 1 unit.
| Add-on test | Price |
|---|---|
| Identity and impurities | |
| FTIR identity | $90 |
| CHNS elemental analysis (carbon, hydrogen, nitrogen, sulfur) | $125 |
| Chiral purity (where a chiral method exists; new methods quoted) | $250 |
| Water, solvents and salt form | |
| Water content by Karl Fischer | $60 |
| Residual solvents | $150 |
| Counterions: chloride, acetate and TFA | $70 |
| Assay | |
| Assay, % w/w (with raw powder purity; $250 together) | +$50 |
| Metals and conformity | |
| Heavy metals: arsenic, cadmium, chromium, mercury and lead | $150 |
| Conformity: purity and quantity on more units from the same lot | $100 per extra unit |
| Microbiology (injectables) | |
| Endotoxin | $210 |
| Sterility or bioburden | $150 |
| Container closure integrity (CCI) | $50 |
| Screening | |
| Fentanyl screen | $50 |
10% off for 10 or more samples.
Need something else? Other tests are available on request.
Purity and quantity is $250 per sample (1 unit) and raw powder purity is $200 for 50 mg, with results in 3 to 5 business days. Send the material sealed and labeled, with the label claim and the form it contains.
No. The $250 test covers identity, purity and quantity by HPLC-UV for purity and assay, with LC-MS to confirm identity. Full testing to the USP Phentolamine Mesylate monograph is available and quoted.
Results are reported against the labeled form, usually phentolamine mesylate. The base makes up about three quarters of the salt by weight, so the form matters when comparing numbers.
Phentolamine slowly hydrolyzes in solution, faster when stored warm, so the HPLC purity profile is useful for checking older or stored preparations.
Yes. It often appears with papaverine and alprostadil; each labeled compound can be quantified, and mixtures are quoted by the number of compounds.
https://pubchem.ncbi.nlm.nih.gov/compound/91430
Identity facts from the USP monograph header for this compound.
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