Beyond the Meter's Limit — What ORO CELESTE Picual's Lab Report Actually Says

A Notation That Stops Careful Shoppers in Their Tracks

Anyone who studies an olive oil product page seriously has probably opened a Certificate of Analysis (COA) — that document listing acidity, peroxide value and polyphenol content in neat rows. On the polyphenol line of the ORO CELESTE Picual COA, a phrase appears that is not common: '>LOQ (Limit of Quantification)', sometimes written as '800+ mg/kg'.

At first glance, two opposite readings seem possible. Either the instrument failed to capture the number properly — or the concentration was so high that it ran off the scale. The second reading is the correct one.

What LOQ Means — The End of the Instrument's Ruler

In analytical chemistry, the Limit of Quantification is the upper boundary at which a measuring instrument can report a trustworthy figure. The polyphenol methods most widely used by accredited laboratories and EU olive oil certification bodies — Folin-Ciocalteu and HPLC-based assays — typically set their reliable quantification ceiling at roughly 600–800 mg/kg. A sample that exceeds that threshold is not unreadable; it simply sits beyond the end of the instrument's ruler.

According to IOC polyphenol analysis guidelines, total polyphenol content in mainstream extra virgin olive oils is generally distributed between 50 and 500 mg/kg, and oils above 500 mg/kg are reported to qualify as high-polyphenol grade. Readings that surpass 800 mg/kg account for only a small fraction of the global EVOO market.

The Structural Reasons Picual Reads So High

A high polyphenol result is shaped by origin, harvest timing and, above all, the cultivar's own biochemistry. Picual — native to Spain's Jaén province — is recognised for accumulating exceptionally rich concentrations of secoiridoid phenolic compounds, particularly oleocanthal and oleacein.

A cultivar comparison study published by Spain's National Research Council (CSIC) reported that Picual showed average total phenol content 1.4 to 2 times higher than major cultivars such as Arbequina and Cornicabra under equivalent harvest and milling conditions. That advantage is amplified further when an early-harvest approach is used.

ORO CELESTE Picual publishes its own measured values: acidity 0.20% and polyphenols 800+ mg/kg. An acidity of 0.20% sits well below the extra virgin threshold of 0.8%, and is generally read as an indicator that both freshness and milling quality were high at the point of harvest.

How to Read the Numbers — Three Contexts That Matter

A COA figure only tells its full story when placed in context. Three factors deserve attention.

First, the measurement method. Total polyphenols are measured by the Folin-Ciocalteu method; individual phenolic compounds such as oleocanthal and oleacein are identified by HPLC-DAD. It matters which method produced the figure you are looking at — the two approaches can yield different readings from the same sample.

Second, the harvest batch. Polyphenol content shifts from year to year and even from one picking date to the next within a single season. A COA is a snapshot of one specific lot. Where a brand publishes lot-specific certificates — as ORO CELESTE does — it is worth confirming that the lot number on the bottle matches the lot number on the document.

Third, what the '>800' notation actually signals. Some readers intuit that a '>' sign conceals the real number. In fact it does the opposite: it transparently discloses the instrument's limit rather than fabricating a figure beyond its reliable range. Laboratories can obtain a more precise reading by diluting the sample and re-running the assay, but that requires a separate additional analysis.

What Changes When Polyphenols Are High

High-polyphenol oils are also distinguishable by taste. The peppery catch at the back of the throat — pungency — and pronounced bitterness are the sensory signatures of oleocanthal and oleacein respectively.

In 2011, the European Food Safety Authority (EFSA) approved a qualified health claim stating that olive oil polyphenols are associated with protection of LDL cholesterol from oxidative stress when the oil contains at least 250 mg/kg total phenolic compounds and is consumed at 20 g per day (EFSA Journal 2011;9(4):2033). That claim is strictly conditional under EU regulation and is categorically separate from any disease-prevention or treatment language.

The Picual's 800+ mg/kg sits at more than three times that reference level. Even so, it is too early to conclude that any specific polyphenol figure guarantees a defined outcome for an individual; the broader context of a person's diet and eating habits always plays a role.

A Reader's Guide to the Certificate of Analysis

The key figures to check on any olive oil COA are free fatty acidity, peroxide value, total polyphenols and — where available — an individual phenolic compound profile. If the polyphenol line shows '>800' or '800+ mg/kg', treat it as context rather than confusion. It is not a defect flag. It indicates that the concentration exceeded the instrument's quantification ceiling — placing the oil firmly in high-polyphenol territory.

ORO CELESTE Picual carries that notation not to overstate or obscure a number, but because publishing the honest boundary of what the measurement reached is where quality transparency begins. Learning to read a single figure correctly is the first skill of choosing excellent olive oil.