Citric acid: organic acid (tricarboxylic acid).
Citric acid testing at Vanguard Laboratory: identity, purity and quantity $250 per sample, with results in 3 to 5 business days.
Citric acid: 2D structure drawn from the PubChem record (CID 311).
77-92-9
C6H8O7
192.12 g/mol
Organic acid (tricarboxylic acid)
Identity: Citric acid (anhydrous)
IUPAC name: 2-hydroxypropane-1,2,3-tricarboxylic acid
Method for the $250 identity, purity and quantity test: Chromatographic assay, with detection selected for the compound, against a reference standard, with results in 3 to 5 business days.
The USP monograph covers identity by infrared spectroscopy, assay by titration, limit tests for sulfate, aluminum and oxalic acid, readily carbonizable substances, residue on ignition, clarity and color of solution, water, bacterial endotoxins and sterility. Full testing to the USP Anhydrous Citric Acid 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 a chromatographic assay, with detection selected for the compound. Full testing to the USP Anhydrous Citric Acid monograph is available and quoted.
The monohydrate carries one water molecule per citric acid, so it weighs more per mole. Water content tells the two apart, and assay is reported on the anhydrous basis.
Oxalic acid can occur as a by-product of citric acid fermentation and purification, so the monograph sets a limit for it.
Citric acid has little UV absorbance, so the lab uses a detection method suited to the compound.
https://pubchem.ncbi.nlm.nih.gov/compound/311
Identity facts from the USP monograph header for this compound.
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