Olive Oil Analysis | The Most Important Values at a Glance

The following table shows important quality characteristics for the legal category extra virgin olive oil according to the European regulation.

Important: This table is deliberately reduced to the most frequently discussed quality parameters.

The European classification also includes other purity and authenticity markers, including fatty acid composition, sterols, waxes, and other analytical parameters.

Therefore, an olive oil is not classified as extra virgin olive oil based on a single laboratory value.

1. Acidity | What does the number really mean?

Acidity is one of the best-known analytical values for olive oil.

It does not refer to a sour taste.

Analytically, the content of free fatty acids is determined.

These free fatty acids can form when fat molecules, or triglycerides, are split by hydrolysis.

The condition of the olives, damage to the fruit, unfavorable conditions before processing, and delays between harvesting and processing can all play a role.

For extra virgin olive oil in the European Union, the maximum threshold is:

0.80 percent.

Is 0.20 percent automatically better than 0.40 percent?

No.

Both values can be well within the legal requirements for extra virgin olive oil.

A low acidity level is analytically interesting.

However, it does not prove on its own that the olive oil in question is sensorially better, more aromatic, fresher, or more suitable for a particular individual.

The European Commission itself points out that the isolated reporting of acidity can mistakenly create the impression of an absolute quality scale.

Therefore, it must be considered in the context of other physical-chemical quality markers.

Low acidity is part of the picture | not the whole picture.

2. Peroxide Value | What does it say about oxidation?

The peroxide value is also one of the classic quality parameters for olive oil.

It measures primary oxidation products, particularly hydroperoxides.

Oxidation is a process that can begin before a consumer perceives clear rancid odors or flavors.

Oxidative changes are influenced by factors such as:

• Oxygen
• Light
• Temperature
• Storage duration
• Fatty acid composition
• Natural antioxidant components
• Initial quality

According to EU regulations, for extra virgin olive oil:

Peroxide value ≤ 20.0 meq O₂/kg.

Is a particularly low peroxide value automatically proof of freshness?

Not on its own.

Primary oxidation products can change over time or turn into secondary oxidation products.

Therefore, it is sensible to view the peroxide value in conjunction with other UV absorption parameters and the sensory assessment.

The peroxide value is also not a quality competition on its own.

3. K232 | Why is olive oil tested with UV light?

K232 is a parameter of UV spectrophotometric analysis.

This test measures how strongly the olive oil absorbs light in a defined wavelength range.

K232 is related to conjugated dienes and primary oxidative changes, among other things.

For extra virgin olive oil:

K232 ≤ 2.50.

The value thus provides further information about the condition of the olive oil.

However, a simple statement such as:

The lower the K232, the better the olive oil tastes

would not be justified.

K232 describes an analytical aspect, not a personal flavor profile.

4. K268 or K270 | Another look at oxidative changes

On laboratory reports, depending on the method used or the measurement conditions, K268 or K270 may appear.

These values also come from UV spectrophotometric testing.

This wavelength range is relevant for conjugated trienes and more advanced oxidative changes, among others.

For extra virgin olive oil:

K268 or K270 ≤ 0.22.

Combining different parameters is especially sensible when addressing questions of oxidation.

The peroxide value, K232, and K268 or K270 do not illuminate exactly the same things.

An analysis therefore becomes more meaningful when multiple values are read together.

5. Delta K | A small number, but part of the official analysis

Delta K is a calculated parameter from UV spectrophotometric testing.

It helps in classifying anomalies in the absorption spectrum of the olive oil tested.

For extra virgin olive oil:

Delta K ≤ 0.01.

For consumers, Delta K is harder to understand intuitively than, for example, acidity.

Nevertheless, the value is part of the analytical characterization.

However, a particularly low Delta K value does not automatically mean that the olive oil is sensorially better than another oil.

6. Fatty Acid Ethyl Esters | An often overlooked quality parameter

On more detailed analysis reports, the abbreviation FAEE or the entry "fatty acid ethyl esters" may appear.

According to current EU regulations, for extra virgin olive oil:

Fatty acid ethyl esters ≤ 35 mg/kg.

This parameter is also one of the quality markers considered during legal classification.

For consumers, one realization is particularly important:

The legal category of extra virgin olive oil depends on several analytical and sensory requirements simultaneously.

7. Sensory | Why the laboratory does not fully replace the human

This point is particularly important.

In the EU, extra virgin olive oil is not classified solely based on chemical laboratory values.

Organoleptic or sensory features are also part of the legal assessment.

For extra virgin olive oil:

• Median of defects Md = 0.0
• Median of fruitiness Mf > 0.0

The required sensory testing is carried out according to a standardized procedure by a properly trained tasting panel.

This must not be confused with a private tasting by a retailer or consumer.

A personal tasting answers a different question:

How do I perceive this olive oil, and do I like its style?

Conversely, the official sensory test answers, among other things, the question of whether the mandatory organoleptic requirements for the quality class are met.

Bitterness and Pungency | Are they quality defects?

No.

Bitterness and pungency are defined as positive sensory attributes of extra virgin olive oils.

Therefore, a bitter or peppery olive oil is not automatically defective.

At the same time, the opposite statement would be too simple:

The more bitter and pungent, the better.

The intensity depends on factors such as olive variety, ripeness, phenolic composition, processing, and product style.

Personal taste also plays a role in enjoyment.

A harmonious olive oil can be just as high-quality as a very intense one.

8. Polyphenols | Why high numbers must be interpreted correctly

Polyphenols are among the most interesting natural compounds found in extra virgin olive oil.

They can influence bitterness and pungency and also play a role in oxidative stability.

However:

Total polyphenols are not among the fundamental limits used to classify an olive oil as extra virgin olive oil.

An olive oil does not become extra virgin just because it has, for example, 500, 1,000, or 2,000 mg/kg of total polyphenols.

Conversely, an oil with a lower polyphenol value is not inferior for that reason alone.

Why 500 mg/kg are not automatically comparable to 1,000 mg/kg

A specific problem often arises with polyphenols.

There are different analytical procedures and different ways of expressing results.

These include, for example:

• Folin-Ciocalteu method
• HPLC-based methods
• LC-MS-based analyses
• qNMR or NMR-based determinations of specific phenolic compounds

In addition, depending on the method, the following differ:

• Detected compounds
• Calibration standards
• Sample preparation
• Calculation
• Units or reference values

A scientific comparative study by Olmo-García and colleagues showed that different global and specific methods do not automatically lead to identical absolute concentrations.

Therefore:

Polyphenol values should only be compared directly with one another if it is clear what was measured and how it was measured.

Green Agora explains the methods in more detail here:

Measuring Polyphenol Content in Olive Oil | HPLC, qNMR, and Laboratory Analyses

Total Polyphenols and EU Health Claim | Not the same

This distinction is especially important when making health claims.

The claim authorized in the European Union is:

"Olive oil polyphenols contribute to the protection of blood lipids from oxidative stress."

This claim may only be used for olive oil that contains at least:

5 mg of hydroxytyrosol and its derivatives, such as oleuropein complex and tyrosol, per 20 g of olive oil.

Additionally, consumers must be informed that the beneficial effect is obtained with a daily intake of 20 g of olive oil.

This means:

An arbitrary total polyphenol value in mg/kg is not automatically proof that the conditions of this authorized claim are met.

The decisive factor is which relevant compounds were determined and whether the specific analysis is technically and legally suitable for this assessment.

Green Agora explains the legal and analytical classification here:

EU Health Claim for Olive Oil | Hydroxytyrosol and Laboratory Analyses

Analysis values need context | Harvest, batch, method, and date

An analysis value is not a timeless property of a brand.

Olive oil is a natural product, and its composition can change from harvest to harvest.

When interpreting a lab report, the following information should ideally be available:

• Exact product name
• Olive variety or blend
• Harvest or harvest year
• Batch or unique sample
• Analysis date
• Laboratory
• Method used
• Compound or parameter measured
• Unit

The method used is particularly important for polyphenol values.

But for other values as well, it should be traceable which sample was actually tested.

An analysis from an earlier harvest must not simply be presented as the current product characteristic of a new harvest.

Why the same olive oil does not necessarily have the same values every year

Even if the producer and olive variety remain the same, analytical values can change between two harvests.

Influencing factors include, among others:

• Climate
• Precipitation and water supply
• Temperatures during the growing season
• Degree of ripeness
• Time of harvest
• Condition of the fruit
• Time between harvest and processing
• Extraction conditions
• Filtration
• Storage

This is why, for example, Koroneiki is not analytically identical to Koroneiki every year.

Two producers with the same olive variety can also produce very different olive oils.

Early Harvest Olive Oil | Understanding Early Harvest correctly

A laboratory analysis is a snapshot

An analysis basically describes the tested sample at the time of examination.

After that, the olive oil does not remain chemically frozen.

Various properties can change during storage.

Relevant factors include, among others:

• Light
• Oxygen
• Temperature
• Time
• Packaging
• Initial composition

This means:

A very good analysis value at the time of bottling is no guarantee that the olive oil will retain the same condition indefinitely after unfavorable storage.

Storing olive oil correctly | Light, heat, oxygen, and freshness

Can a laboratory analysis show whether I will like an olive oil?

Not completely.

An analysis can provide important objective information.

It can show how certain chemical quality parameters turn out.

It can determine individual ingredients.

It can assist in classification, quality control, and authenticity verification.

But it cannot decide which sensory profile you personally prefer.

Two analytically flawless extra virgin olive oils can have completely different effects.

An olive oil can be:

• very green and herbaceous
• clearly bitter
• intensively peppery

Another can be:

• more harmonious
• softer
• more ripe fruity
• less intensely bitter and pungent

Both can be high-quality.

Laboratory analysis and personal tasting | Two different tasks

Analytical examination and personal tasting should not be played off against each other.

They answer different questions.

The laboratory can ask, for example:

• What is the free acidity?
• What is the peroxide value?
• What are the K232 and K268 or K270 levels?
• What is the Delta K?
• Which phenolic compounds are present?

Personal tasting, on the other hand, asks:

• How do I perceive the fruitiness?
• How distinct are the bitterness and pungency?
• Which aromas can I identify?
• Does the olive oil seem harmonious or very intense?
• Does it suit my taste?
• Does it suit my intended use?

And standardized official sensory testing has a different function again than personal taste consultation.

That is precisely why chemistry, professional sensory analysis, and personal taste should be clearly distinguished from one another.

Ayhan's classification | Which number interests me first?

When I have a laboratory report in front of me, I do not automatically look for the highest polyphenol number.

I want to understand first what exactly was analyzed.

I ask:

• Which product is it?
• Which olive variety?
• Which harvest?
• Which batch?
• When was the sample tested?
• Which laboratory performed the analysis?
• What method was used?
• What do the acidity and oxidation parameters look like?
• Which polyphenols were actually determined?
• How does the olive oil taste?

Only then does the real classification begin for me.

An analysis can build trust if it is transparent and comprehensible.

However, it should not be used to turn a single number into a complete quality ranking.

The highest number does not automatically win.

I am interested in the overall picture.

Understand the olive oil. Understand the people. Bring both together.

Ayhan Çabuk from Green Agora

Reading an olive oil analysis | My practical checklist

1. Identify the product
   Does the analysis actually belong to the olive oil being offered?
2. Check harvest and batch
   Is it clear which harvest or sample was examined?
3. Check the analysis date
   An analysis is a snapshot.
4. Do not evaluate acidity in isolation
   A low value is not automatically a complete quality grade.
5. View oxidation parameters together
   Peroxide value, K232, and K268 or K270 complement each other.
6. Take Delta K and other quality features into account
   The legal classification includes more than just the three best-known numbers.
7. Do not forget sensory analysis
   Extra virgin olive oil is not just a chemical category.
8. Check the method for polyphenols
   Which compounds were determined and how was the result calculated?
9. Do not automatically equate total polyphenols with the EU Health Claim
   Specific legal conditions apply to this.
10. Compare only afterwards
    Only compare values that are truly analytically comparable.

Frequently asked questions about olive oil analysis

What acidity level is allowed for extra virgin olive oil?

According to current EU regulations, the acidity must not exceed 0.80 percent. However, compliance with this value alone is not sufficient for full classification as extra virgin olive oil.

Is an acidity of 0.20 percent better than 0.40 percent?

Not automatically. Both values can be well within the legal limit. For the overall assessment, other chemical and sensory characteristics must be taken into account.

Can you taste the acidity?

No. The analytically determined content of free fatty acids should not be equated with an acidic taste like lemon juice or vinegar.

What does the peroxide value mean?

The peroxide value records primary oxidation products. It is an important quality parameter but should be viewed together with other oxidation and UV parameters.

What does K232 mean?

K232 is a UV spectrophotometric parameter and is associated, among other things, with conjugated dienes and primary oxidative changes.

What does K270 mean?

K270 or K268 also comes from UV analysis and provides information from a different wavelength range, which is relevant for more advanced oxidative changes, among others.

What does Delta K mean?

Delta K is a calculated UV parameter and is part of the analytical characterization of olive oil.

What does FAEE mean in olive oil?

FAEE stands for Fatty Acid Ethyl Esters. In the EU, a maximum limit of 35 mg/kg currently applies to extra virgin olive oil.

Are polyphenols a legal criterion for extra virgin olive oil?

Total polyphenols are not among the fundamental limit values that solely determine the extra virgin olive oil grade.

Are more polyphenols automatically better?

No. Polyphenols are analytically and sensorially interesting. However, a higher total value alone does not automatically mean higher overall quality or better suitability for every person.

Can one compare polyphenol values from different laboratories?

Only with caution. Methods, calibration, captured compounds, and the way results are presented can differ.

Is total polyphenol the same as an EU Health Claim?

No. The authorized claim is subject to specific conditions regarding hydroxytyrosol and its derivatives per 20g of olive oil.

Can an analysis from the last harvest be used for the new harvest?

It can serve as historical information but should not be presented as the current analysis of a new harvest or batch without clear labeling.

Does a laboratory analysis replace tasting?

No. Laboratory analysis, standardized sensory testing, and personal taste perception answer different questions.

Premium olive oil at Green Agora | Viewing analysis and sensory quality together

At Green Agora, we do not want to reduce high-quality olive oil to a single number.

For us, classification includes:

• Olive variety
• Origin
• Producer
• Harvest
• Processing
• Current analyses, where available
• Sensory quality
• Usage
• Personal taste

Discover premium olive oils at Green Agora

Anyone who would like to compare different olive oils personally can visit our olive oil showroom in Lüdenscheid by appointment.

Olive oil tasting and showroom at Green Agora

Sources and professional basis

For the legal and scientific classification of this article, the following sources were used in particular:

1. European Commission | Delegated Regulation (EU) 2022/2104 | consolidated version | Characteristics and marketing standards for olive oil
2. European Commission | Implementing Regulation (EU) 2022/2105 | Analytical methods for determining the characteristics of olive oils
3. European Commission | Regulation (EU) No 432/2012 | authorized health claim regarding olive oil polyphenols
4. Olmo-García L. et al. | Evaluating the reliability of specific and global methods to assess the phenolic content of virgin olive oil | Journal of Chromatography A | 2019
5. Tarapoulouzi M. et al. | Recent Advances in Analytical Methods for the Detection of Olive Oil Oxidation Status during Storage along with Chemometrics, Authenticity and Fraud Studies | Biomolecules | 2022
6. Green Agora | Measuring polyphenol content in olive oil | HPLC, qNMR, and laboratory analyses
7. Green Agora | EU Health Claim for olive oil | Hydroxytyrosol and laboratory analyses
8. Green Agora | Storing olive oil correctly | Light, heat, oxygen, and freshness

Editorially reviewed | September 2026.

The cited limit values refer to the European regulations in force at the time of editorial review. For the legally binding classification of a specific sample, the current legal version, the prescribed analytical method, and the results of the specific examination are decisive.

Analysis values for olive oil can vary depending on harvest, batch, processing, storage, examination method, and time of analysis. Figures from different products or laboratories should therefore only be compared if their analytical basis is truly comparable.