Methylene blue: small molecule (phenothiazinium dye).
Purity and quantity by the chromatographic method matched to the compound (HPLC-UV, LC-MS or GC-MS), with identity against a reference standard. $250 per sample; raw powder purity $200. Results in 3 to 5 business days.
Full USP monograph testing is available. See USP Testing.
Methylene blue: 2D structure drawn from the PubChem record. Stereochemistry shown as registered.
61-73-4 (anhydrous)
C16H18ClN3S (trihydrate C16H18ClN3S·3H2O)
319.9 g/mol (anhydrous); 373.9 (trihydrate)
small molecule (phenothiazinium dye)
IUPAC name or sequence: [7-(dimethylamino)phenothiazin-3-ylidene]-dimethylazanium chloride
Other names: Methylthioninium chloride, basic blue 9; trihydrate CAS 7220-79-3
Anhydrous and trihydrate differ by 54 g/mol; state which form the label claim refers to.
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.
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