Potassium benzoate

Potassium benzoate: preservative (potassium salt of benzoic acid).

Potassium benzoate testing at Vanguard Laboratory: identity, purity and quantity $250 per sample, with results in 3 to 5 business days.

Structure

Potassium benzoate: 2D structure drawn from the PubChem record (CID 23661960).

Compound data

CAS number

582-25-2

Formula

C₇H₅KO₂

Molecular weight

160.21 g/mol (monoisotopic 159.99)

Type

preservative (potassium salt of benzoic acid)

Structure and names

IUPAC name: potassium benzoate

How Vanguard tests Potassium benzoate

Identity, purity and quantity are measured by reversed-phase HPLC with UV detection against a reference standard, $250 per sample with results in 3 to 5 business days. Finished products use the same approach, with sample preparation matched to the product.

A USP monograph exists for Potassium Benzoate; testing to the USP Potassium Benzoate monograph is available and quoted.

What's reported

Purity, as percent of total peak area
Quantity, in mg per serving or % w/w against the label
Identity, reported as match or no match against the reference standard
With monograph testing (quoted): the monograph’s tests against its limits

Tests and prices

Purity and quantity

$250

Chromatographic purity and mg per unit by the method matched to the compound, identity against a reference standard. 1 unit.

Raw powder purity

$200

Chromatographic purity on bulk powder. 50 mg.

Add-on tests

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

10% off for 10 or more samples.

Need something else? Other tests are available on request.

Sample amount and turnaround

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.

Salts, forms and compendial references

A USP monograph exists for Potassium Benzoate. Monograph testing is quoted.
Tell us the salt or form the label states, so quantity is reported on the same basis.
One page covers Potassium benzoate and its salts and forms.

Questions about Potassium benzoate testing

Sodium or potassium benzoate: does it change the result?

Yes. Benzoic acid is about 85% of sodium benzoate's weight and about 76% of potassium benzoate's, so tell us which salt your formula uses.

Can you test it in a finished product?

Yes. Capsules, powders, gummies and liquids are measured with sample preparation matched to the product, and reported in mg per serving or % w/w against the label.

Sources

https://pubchem.ncbi.nlm.nih.gov/compound/23661960

Order

Send the product name, the form of the ingredient and the label claim for a quote, or submit a sample with the sample form.

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