Chromatographic purity
High-performance liquid chromatography separates components as they move through a column. A purity figure from that separation is usually the area of the main peak compared with the areas the method detected.
The number depends on the column, the solvents, the detector, and the way the peaks were integrated. A different method can report a different figure for the same material.
Chemical identity
Purity and identity are different questions. A large peak can still be the wrong compound if the method was not asked to confirm the structure. Mass spectrometry, or another identity method, is used when the question is whether the main component has the expected mass or fragments.
A catalogue name is not an identity test. Identity is established only by a method applied to the batch being described.
What a percentage leaves out
A chromatographic purity result does not automatically report water, residual solvents, counterions, microbial limits, or endotoxin. Those are separate tests, used when they are relevant to the compound and when the records exist.
A high purity figure does not establish safety or suitability for human or veterinary administration. Analytical purity is one part of characterization.
How this catalogue treats purity
BioCore Central does not publish a purity percentage for current listings. A result is shown only when it comes from an authentic document for the batch it names. The vial label is not that document.