COA checker

Enter what a certificate of analysis reports. The checker tests the mass against the compound's expected ions, sanity-checks the purity figure, and flags missing documentation.

What the checks mean

Mass spectrometry confirms identity: the reported value should match the neutral mass or one of the protonated ions [M+H]⁺, [M+2H]²⁺ and so on, within the instrument's tolerance. When it doesn't, the size of the gap often points to the cause, such as +16 Da for oxidation or a missing residue. HPLC purity says how much of the UV signal belongs to the main peak; it does not prove identity on its own.

The documentation checks reflect what makes a certificate verifiable: a lot number that ties it to your vial, a named and ideally accredited laboratory, the raw chromatogram and spectrum, and a recent date. For a full walkthrough see how to read a COA.

The checker evaluates the numbers you enter; it cannot detect a forged document. Confirm unusual results with the testing laboratory directly.