A commercial deep fryer at 175 °C is a chemical environment most procurement teams never see firsthand. The oil oxidizes. Aldehydes form. Polar compounds accumulate. Eventually a regulator-defined threshold is crossed and the oil has to be discarded — a cost line that, depending on the operation, can easily exceed the price of the oil itself.
In 2025, Fedepalma’s New Business Development team partnered with the Food Technology Unit at the University of Caldas to run a clean, controlled comparison of seven commercial oils through this exact environment.1 Same fryer. Same potatoes. Same temperature. Same 25%-total-polar-compounds discard threshold — the EU and US regulatory limit. The trial ran each oil to failure, or to 300 frying cycles, whichever came first.
The results matter because they translate the abstract argument about “oxidative stability” into a single, defensible operational metric: how many cycles can your kitchen run before the oil has to be replaced.
The setup, briefly.
A 6-litre stainless steel batch fryer with PLC-controlled temperature, agitation, and immersion. Pre-fried frozen French fries (9×9 mm cross-section, 0.5 kg per cycle). Oil-to-potato ratio 12:1, replenished with fresh oil as the level dropped. Frying conditions: 175 °C, 7 minutes per cycle, 2 minutes rest. Polar compounds measured with a Testo 270 at intervals through each oil’s run.1
Every oil contained 150 ppm of the antioxidant TBHQ to standardize storage stability before testing. Before frying, the oils were also characterized for fatty-acid profile, peroxide value, anisidine value, iodine index, and Rancimat oxidative stability index (OSI) at 110 °C.
The result, plainly.
Three oils made it to 300 cycles without crossing the 25% polar-compound discard threshold. Four didn’t. The grouping mapped almost perfectly to fatty-acid composition: oils dominated by polyunsaturated fat (PUFA) failed quickly; oils dominated by oleic acid lasted.
What this actually tells you.
If your operation runs PUFA-heavy oil — standard sunflower, canola, soybean — the trial puts a hard upper bound on usable fryer life under continuous service: roughly 100–150 frying cycles, depending on the specific oil. Beyond that point you’re cooking in oil that exceeds regulatory polar-compound limits.
If you spec a high-oleic oil — whether that’s HOPO, HOPO olein, or high-oleic sunflower — the trial puts you at 300+ cycles without crossing the limit. The chemistry is the chemistry: oleic acid (C18:1, one double bond, monounsaturated) is harder for oxygen to attack than linoleic acid (C18:2, two double bonds, polyunsaturated). Fewer attack sites, slower degradation, longer fryer life.2
The trial also confirms the underlying Rancimat OSI numbers translate into real-world cycle counts. HOPO measured at 74.3 hours OSI (Rancimat 110 °C). HOPO olein at 72.4. HO sunflower at 101. The three PUFA-heavy oils measured at 14–31 hours — and they all failed at roughly 100–150 cycles. Lab metric, field outcome.1
The honest reading.
HOPO and HOPO olein both cleared the 300-cycle ceiling. So did high-oleic sunflower — and HO sunflower actually outperformed HOPO on the Rancimat OSI alone (101 hours vs ~74 hours). On single-metric oxidative stability, HOPO is not the category winner.
What HOPO is, is the only oil in the comparison that combines all of the following:
1. Frying performance that clears the regulatory discard threshold past 300 cycles.
2. Mechanical pressing from sterilized fresh fruit, no hexane in extraction.
3. Non-GMO origin (most commercial HO sunflower is genetically derived).
4. Compositional profile substantially closer to olive oil than to seed oils — ~55% oleic, ~32% saturated, ~13% PUFA per the published OxG hybrid data.3
5. Single-origin sourcing from two named Colombian operations, RSPO + ISCC + ISO 14067 certified.
This is not a single-metric story.
If you only care about Rancimat OSI in isolation, high-oleic sunflower beats us. We’re not pretending otherwise. The procurement-grade case for HOPO is the combination — frying performance + extraction method + GMO status + nutritional composition + traceable single-origin sourcing — not a single-cell superiority on any one metric. Read the comparison table on the homepage for the full grid.
Why we’re publishing this.
The Fedepalma trial is a piece of independent, methods-disclosed, third-party-lab data — not TOI’s own marketing assay. The Colombian palm industry commissioned it because the high-oleic palm category didn’t have its own controlled frying data on the record. Now it does.
For a procurement buyer evaluating cooking-oil switches against a 6-figure annual line item, that level of methodological transparency matters more than any number we could publish on a brochure. The full paper is in the Sources block below.
If you want to verify the trial against the specific lot you’d be buying, request a sample — the COA we ship with it includes the same Rancimat OSI test, run on the actual oil. Read this page, look at the COA, decide for yourself.
