Avocado Oil: Composition, Applications and Analytical Control

Avocados are widely recognized for their high nutritional value. They are rich in antioxidants, omega-3 fatty acids, magnesium, potassium, fiber, and vitamins A, B, C, D, E and K. Beyond fresh consumption, avocado oil represents one of the most valuable derivatives of this fruit. [3]

Unlike most edible oils, which are extracted from seeds, avocado oil is obtained from the fruit pulp surrounding the pit. Its lipid profile is characterized predominantly by monounsaturated fatty acids, particularly oleic acid, which can reach up to 66 percent, and palmitic acid, typically ranging from 12 to 24 percent. In the Hass variety, oils produced from crops grown in Mexico, Australia, the United States and New Zealand have shown a lipid content of approximately 62 percent. Within this fraction, oleic acid represents about 42 to 51 percent, while palmitic acid ranges between 20 and 25 percent. This composition contributes to the oil’s stability and functional properties.  [3][4]

Avocado oil contains significant amounts of phytosterols, compounds that exhibit skin penetration properties comparable to lanolin. This characteristic makes the oil particularly valuable in cosmetic formulations. [1]

Another important component is lutein, a carotenoid naturally present in high concentrations. Lutein is associated with protective effects against oxidative stress and is widely studied for its role in eye health and macular protection. Avocado oil is appreciated for its: antibacterial activity, emollient properties, moisturizing capacity, skin penetration efficiency, oxidative stability. [3]

Its high penetration ability allows it to act as an effective carrier for other active ingredients that would otherwise have limited permeability through the skin barrier. The presence of lecithin and phytosterols enhances spreadability, while its relatively low surface tension facilitates emulsification, enabling the production of smooth creams and soaps. For these reasons, avocado oil is widely used in: face and body moisturizers, replenishing facial creams, skin repair formulations, hair conditioners and masks. Its antioxidant and moisturizing properties make it particularly suitable for dry skin and hair applications. [2]

Although no specific international regulation is exclusively dedicated to avocado oil, quality assessment is commonly aligned with the criteria established for olive oil by the Codex Alimentarius and the International Olive Oil Council.

In the case of Acid Value determination is commonly performed according to AOCS Official Method Cd 3d-63, based on an acid base titration principle. The method quantifies free fatty acids through neutralization with standardized potassium hydroxide and expresses results as mg KOH per gram of oil. The analysis requires dissolution of the sample in a neutralized alcoholic medium, typically ethanol or an ethanol ether mixture, with solvent volumes generally ranging from 50 to 100 mL to ensure complete solubilization. Phenolphthalein is used as the visual indicator for endpoint detection. From an operational standpoint, the method involves handling flammable solvents and caustic potassium hydroxide solutions. Phenolphthalein, although widely used, is classified as a suspected carcinogen under certain regulatory frameworks, which requires appropriate laboratory safety measures and controlled waste disposal.

In the quantification of Peroxide Value, it is used AOCS Official Method Cd 8b-90, based on iodometric titration. It measures hydroperoxides formed during the early stages of lipid oxidation. Results are expressed as milliequivalents of active oxygen per kilogram of oil. The method requires dissolution of the oil in an acetic acid isooctane mixture, typically in a 3:2 volume ratio, with total solvent volumes also in the range of 50 to 100 mL. Hydroperoxides oxidize iodide ions to iodine, which is subsequently titrated with standardized sodium thiosulfate solution, using starch as an endpoint indicator. This procedure involves corrosive acetic acid, flammable isooctane, and reactive iodide solutions. The method is sensitive to reagent quality, blank corrections, and operator technique. At elevated oxidation levels, particularly above 70 meq per kilogram, result variability may increase due to the empirical nature of the titration.

Traditional AOCS methods are laboratory based and require:

• Significant volumes of solvents
• Extensive glassware
• Fume hood operation
• Skilled laboratory personnel
• Careful reagent preparation and standardization

These procedures are time consuming, require strict safety precautions, and are not suitable for on line or at site quality control during production or processing. Titration techniques demand technical expertise and are not easily integrated into routine industrial workflows.

As a result, real time monitoring of parameters such as Free Fatty Acids and Peroxide Value during production remains challenging when relying exclusively on conventional methods.

To overcome these limitations, rapid analytical systems have been developed for direct application in production environments.

CDR FoodLab^® Analysis System is used worldwide for the determination of key quality parameters in fats and oils. The instrument is based on LED photometric technology and includes thermostated reading and incubation cells maintained at 37 °C. The system allows rapid determination of both Free Fatty Acids and Peroxide Value using pre-calibrated, ready to use reagents. The optimized analytical workflow avoids the use of glassware and requires minimal sample volumes. Results for both parameters can be obtained in approximately five minutes. 

The CDR FoodLab^® methods provide results that correlate with those obtained using the reference methods previously described in this article. In particular, the Peroxide Value method correlates with AOCS Cd 8b-90, while the Free Fatty Acids method correlates with AOCS Cd 3d-63. This correlation supports the use of the system for routine quality control while maintaining consistency with established analytical procedures.

The analyzer is supplied pre-calibrated, eliminating the need for additional calibration procedures. It can be connected to a PC or equipped with a printer to support data traceability to support data traceability. 

This approach enables faster decision-making with reduced solvent handling and improved operator safety. This simplified workflow allows any kind of operator working on site to perform a simple test and improve the internal quality control protocol. The versatility of the system makes it possible to add further parameters including also the p-Anisidine Value measurement to complete the whole panel of oils and fats characterization. 

Comparison between AOCS methods and CDR FoodLab^® analysis for PV and FFA determination

Avocado oil represents a high value product both in the food and cosmetic sectors due to its distinctive fatty acid profile and functional properties. However, maintaining its quality requires reliable monitoring of parameters such as Free Fatty Acids Value and Peroxide Value.

While traditional titration methods remain reference techniques, their complexity limits their suitability for real time industrial control. Rapid photometric systems such as CDR FoodLab^® provide an effective alternative, enabling simplified, safe and efficient quality monitoring directly within production environments.

[1] Flores, M., Saravia, C., Vergara, C. E., Avila, F., Valdés, H., & Ortiz-Viedma, J. (2019). Avocado oil: Characteristics, properties, and applications. Molecules, 24(11), 2172. https://doi.org/10.3390/molecules24112172

[2] L’Oréal. (n.d.). Avocado oil. Inside Our Products. Retrieved from https://inside-our-products.loreal.com/ingredients/avocado-oil

[3] Performance Kitchen. (n.d.). 6 reasons why we’re using avocado oil. Retrieved from https://performancekitchen.com/blogs/blog-articles/6-reasons-why-we-re-using-avocado-oil

[4] Stolp, L. J., & Kodali, D. R. (2022). Naturally occurring high-oleic oils: Avocado, macadamia, and olive oils. In F. J. Flider (Ed.), High Oleic Oils (pp. 7–52). AOCS Press. https://doi.org/10.1016/B978-0-12-822912-5.00003-4