Magnesium citrate

Magnesium citrate: mineral salt (magnesium).

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

Structure

Magnesium citrate: 2D structure drawn from the PubChem record (CID 6099959).

Compound data

CAS number

3344-18-1

Formula

C₁₂H₁₀Mg₃O₁₄

Molecular weight

451.11 g/mol

Type

Mineral salt (magnesium)

Structure and names

Identity: Magnesium citrate (trimagnesium dicitrate, anhydrous)

IUPAC name: trimagnesium bis(2-hydroxypropane-1,2,3-tricarboxylate)

How Vanguard tests Magnesium citrate

Method for the $250 identity, purity and quantity test: ICP-MS metal content, HPLC assay of the citrate counter-ion, against a reference standard, with results in 3 to 5 business days.

The USP monograph covers identity by HPLC retention time and a citrate test, assay by ion chromatography, chloride, sulfate, arsenic and iron limits, calcium by ion chromatography, pH, and loss on drying. Full testing to the USP Magnesium Citrate monograph is available and quoted.

What's reported

Metal content by ICP-MS, against the label or specification
Purity, as percent of total peak area
Quantity, against the label claim
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

Magnesium Citrate (CAS 3344-18-1)
Tell us the salt or form the label states, so quantity is reported on the same basis.

Questions about Magnesium citrate testing

Is the $250 test the same as USP monograph testing?

No. The $250 test covers identity, purity and quantity by ICP-MS for magnesium and HPLC for the citrate. Full testing to the USP Magnesium Citrate monograph is available and quoted.

Is magnesium citrate powder the same as magnesium citrate oral solution?

No. The raw material is a dry salt, while oral solutions are usually made from citric acid and a magnesium base. Results are reported as elemental magnesium or as the labeled salt.

Why does water content matter for magnesium citrate?

Magnesium citrate is sold anhydrous and as hydrates with different water content, which changes the magnesium per gram. Loss on drying shows how much water is present.

Sources

https://pubchem.ncbi.nlm.nih.gov/compound/6099959

Identity facts from the USP monograph header for this compound.

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