What Is HPLC Testing?

HPLC stands for high-performance liquid chromatography. It is an analytical technique used to separate components in a mixture so they can be examined and measured. In research documentation, HPLC results are commonly used when reporting purity or related analytical measurements.

How HPLC works at a high level

A sample is carried through a chromatographic system. Different components interact with the system differently, causing them to separate. The resulting signal can then be analyzed to help identify and quantify components under the method used.

Why HPLC appears on research COAs

HPLC can provide a quantitative measurement associated with the analytical method. When a COA reports an HPLC purity result, researchers can review the stated result alongside the method, batch number, testing date, and laboratory information.

HPLC is not the same as identity testing

Purity and identity answer different analytical questions. A chromatographic purity result can describe measured composition under a method, while an identity method is intended to provide evidence about what material was analyzed. Some laboratories use additional techniques alongside HPLC.

What to look for on a COA

• The analytical method or test name
• The reported purity or assay result
• The lot or batch identifier
• The testing laboratory
• The testing date
• Any additional identity or QC testing

Putting an HPLC result in context

An HPLC number should be read as part of the complete analytical record. Researchers should review the stated method and the rest of the COA rather than assuming that one result establishes every characteristic of a material.

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