What is an HPLC test for olive oil?
What is an HPLC test for olive oil?
HPLC stands for High Performance Liquid Chromatography. It is the gold standard for accurately measuring polyphenols, fatty acids, and other bioactive compounds in olive oil. An HPLC test provides exact, quantitative values—much more accurate than simple color or taste tests.
How does HPLC work?
In HPLC, a liquid sample (in this case, olive oil dissolved in a solvent) is pumped under high pressure through a column filled with absorbent material. Different compounds move through the column at different speeds, after which a detector (UV or mass spectrometer) identifies and quantifies each compound individually.
The result is a chromatogram with peaks per compound, and a report with exact concentrations in mg/kg or mg/L.
What does an HPLC test measure in olive oil?
A professional HPLC analysis of olive oil measures, among other things:
| Compound | What it indicates | Reference value (premium EVOO) |
|---|---|---|
| Oleocanthal | Primary anti-inflammatory agent | >100 mg/kg |
| Oleuropein | Antioxidant, blood pressure lowering | >50 mg/kg |
| Hydroxytyrosol | Strongest antioxidant in EVOO | >10 mg/kg |
| Tyrosol | Antioxidant | Variable |
| Ligstrosides | Polyphenol precursors | Variable |
| Total polyphenols | Sum of all bioactive compounds | >250 mg/kg (EU claim threshold) |
HPLC vs. other measurement methods
| Method | Accuracy | What it measures | Use |
|---|---|---|---|
| HPLC | Very high | Individual polyphenols | Laboratory, certification |
| NMR (Nuclear Magnetic Resonance) | High | Molecular structure and concentration | Laboratory, fraud detection |
| Folin-Ciocalteu | Moderate | Total phenolic content (overall) | Rapid screening test |
| Taste test (panel) | Subjective | Aroma/flavor defects, fruitiness | IOC quality class assessment |
HPLC is the only method that provides exact values for each individual polyphenol. This is necessary for the EU health claim (Regulation 432/2012), which requires olive oil to contain ≥250 mg/kg of polyphenols—demonstrable through accredited laboratory testing.
Why is HPLC important for consumers?
Many manufacturers claim 'high polyphenols' or 'healthy olive oil' without substantiation. An HPLC certificate from an independent, accredited laboratory is the only reliable way to verify whether an olive oil actually contains the promised health values.
At Olijfoliemarkt.nl, we provide HPLC analyses for our high-polyphenol olive oils, so you know exactly what you are buying.
Frequently asked questions about HPLC and olive oil
Can I request an HPLC test myself?
Yes, through accredited laboratories (such as Eurofins or specialized olive oil labs in Spain, Italy, and Greece), consumers or producers can have an HPLC analysis performed. Costs typically range between €150–300 per sample.
How often does the polyphenol content change?
The polyphenol content decreases with time, exposure to light, heat, and oxygen. That is why a fresh harvest, proper storage, and a harvest date on the bottle are so important. An HPLC test immediately after bottling provides the most relevant values.
What is the difference between HPLC and NMR for olive oil?
Both are laboratory techniques, but they measure in different ways. HPLC separates and quantifies individual polyphenols; NMR analyzes molecular structure and is more often used for origin verification and fraud detection. For polyphenol certification, HPLC is the standard.
What value should I look for on an HPLC report?
Pay attention to the value for total polyphenols (total phenols or total biophenols). For the EU health claim, this must be ≥250 mg/kg. Premium olive oil often has 300–800 mg/kg. Also check the oleocanthal value separately—this is the most important individual polyphenol.