HPLC is the workhorse method for botanical extract potency. It is used when a buyer needs a number for a specific molecule — piperine, trans-resveratrol, L-DOPA — or for a defined family such as ginkgolides. The result is only as specific as the method behind it.
How the method works
A prepared sample is injected onto a chromatographic column. Compounds travel through the column at different rates depending on their interaction with the stationary phase and the mobile phase, and they elute at different times. A detector — commonly UV/DAD, sometimes mass spectrometry — records the separated peaks.
The laboratory identifies the marker by comparing retention time and spectral or mass data with a reference standard, then calculates concentration from a calibration curve. System suitability checks (resolution, tailing, repeatability) confirm the run was fit for purpose before results are reported.
What it can prove
- The concentration of a defined marker or marker family in the tested sample.
- That the marker profile is consistent with the reference standard used.
- Batch-to-batch consistency when the same method is applied over time.
Where it stops
- Does not identify the plant if no identity test is performed.
- Does not detect adulterants that are invisible at the chosen wavelength.
- Does not establish safety, efficacy, or finished-product compliance.
Why the method statement matters
Two laboratories can use HPLC and report different values for the same material if the column, mobile phase, wavelength, reference standard, extraction procedure, or calculation basis differs. A COA that says 'HPLC' without specifying the method is more useful than no method, but it is still not fully comparable with another supplier's certificate.
For high-value botanicals, request the chromatogram as well as the percentage. The chromatogram shows whether the peak pattern is consistent with the expected marker profile and whether there are unexplained peaks that could indicate adulteration or a different plant part.
What HPLC does not prove
A potency result does not prove botanical identity, authenticity, or freedom from adulteration beyond the specific peaks measured. Nor does it prove that the extract is effective or that a finished product complies with a market's rules. Identity testing, contaminant panels, and regulatory review remain separate questions.
Reading the result on a COA
- Check the method, column, wavelength, and reference standard.
- Confirm whether the result is as-is or on a dry basis.
- Compare the chromatogram with the expected marker pattern.
What to ask a supplier
Which method and reference standard were used?
Can you provide a chromatogram for this lot?
Is the result as-is or dry basis?
Related terms
References and further reading
External links are provided for orientation. Methods, limits, and acceptance criteria differ by market and product; confirm the applicable requirements with your regulatory advisor.
Cite this page
Rainwood Botanical. "High-performance liquid chromatography (HPLC) for botanical extracts." October 2026. https://ingredients.rainwoodbio.com/resources/methods/hplc/