The deception of Extra Virgin Olive Oil

The deception of Extra Virgin Olive Oil (EVOO)

The practice of adulterating olive oil is an ongoing concern, despite this product being highly regulated under European law. Methods used to adulterate olive oil are becoming increasingly sophisticated. According to scientist Alba Tres Oliver of the University of Barcelona (UB), this sophistication means that standard controls can sometimes overlook fraudulent cases.

Financial profit

The primary incentive for adulterating olive oil is financial gain. Dishonest vendors aim to market their product at lower prices than legitimate producers or simply move larger volumes. Since EVOO is relatively expensive (though its price hasn’t reached 10 euros per liter this year, it remains high compared to past figures), consumers are advised to **be wary of extra virgin olive oil priced significantly below the average**, as such a low price is typically impossible.

Ingredients used in adulteration

To adulterate olive oil, fraudsters often substitute it with inferior quality oils. The key ingredients currently used include:

• Sunflower oil
• Hazelnut oil
• Avocado oil

While standard testing can detect sunflower and hazelnut oils, avocado presents a particular challenge. The expert notes that avocado’s nutritional profile is very similar to olive oil’s, making its detection significantly difficult.

Detection efforts and the criminological view

To counter these complex fraud techniques, the UB has developed and validated an advanced analytical tool specifically designed to detect the adulteration of olive oil. This tool is set to be shared with the Generalitat de Catalunya authorities to combine efforts and strengthen surveillance.

From a criminological viewpoint, fraud contains all the necessary elements of a crime:

1. The Victim: The consumer.
2. The Motive: Economic gain.
3. The Opportunity: Occurs when oversight is insufficient.

The very presence of more effective control instruments serves to discourage criminal attempts.

Types of fraudulent practices

Discussions of olive oil adulteration often recall the notorious historical rapeseed oil fraud, which resulted in over a thousand fatalities. That case was deemed a “double fraud”: rapeseed oil was sold as olive oil, and the rapeseed oil itself had been contaminated with an industrial dye toxic to humans.

In contemporary cases, the expert asserts that the intent behind adulterating olive oil is financial enrichment, not to pose health risks to the general public.

A more common form of deception than adulterating olive oil with other ingredients is labeling fraud. This includes misrepresenting virgin olive oil as extra virgin, or labeling products as EVOO that have degraded in quality due to improper storage. While these labeling deceptions receive less public attention, the professor concludes that severe adulterations involving external ingredients, although present, are “always exceptional.”

Advanced spectroscopy: combating olive oil fraud

Olive oil adulteration—mixing high-quality extra virgin olive oil (EVOO) with lower-grade or seed oils—is a global challenge. Researchers in Morocco, France, and Germany are developing innovative spectroscopic methods to ensure authenticity and protect consumer confidence.

Forward-side fluorescence spectroscopy

Published in Food Chemistry, this technique uses fluorescence emissions (specifically at 430 nanometers) to identify minor chemical changes. Unlike traditional HPLC or GC-MS, this method offers:

• High Sensitivity: Detects adulteration levels as low as 5%.
• Efficiency: Provides results in minutes rather than hours.
• Sustainability: Minimizes the use of toxic solvents and energy.
• Portability: Facilitates real-time analysis at mills or retail points.

Raman spectroscopy and machine learning

Scientist Kilian Visser earned the Heinrich-Stockmeyer Foundation Award for a method combining Raman spectroscopy with machine learning. By analyzing a database of 1,800 “chemical fingerprints,” this system can detect refined sunflower oil in EVOO with an incredible sensitivity of 0.25% in just seconds.

The future of quality control

The integration of advanced chemometrics (like PLS-DA) and artificial intelligence aims to establish “geographic fingerprinting.” This will verify PDO and PGI certifications with 100% accuracy, creating a worldwide standard for food safety and market integrity.

Lab analysis meets sensory profiles

The Italian Association of the Edible Oil Industry (Assitol) is pioneering a new scientific analytical method to complement traditional panel tests. While current European Union and IOC standards rely on eight expert tasters to judge quality, this new technology identifies specific volatile molecules responsible for an oil’s organoleptic profile.

This analytical procedure offers several transformative benefits for the sector:

• Efficiency: It allows for the rapid screening of large sample volumes, helping producers quickly exclude oils that do not meet quality standards.
• Enhanced Labeling: Current laws only allow terms like ‘fruity,’ ‘bitter,’ and ‘spicy.’ New tools could legally verify attributes like artichoke, almond, or herbaceous notes, providing better consumer information.
• Stability Tracking: Producers can more accurately verify the stability and shelf-life of extra virgin olive oil over time.
• Standardization: Similar to the Oleum project, the goal is to create reproducible results worldwide that are cost-effective and sustainable.

By following the lead of the wine and coffee industries, this molecular approach strengthens the panel test system, ensuring that extra virgin olive oil quality is backed by both human expertise and solid scientific data.