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Free Fatty Acids (FFA) in Oils, Oilseeds, and Feed Materials

Oil-Quality-Testing-02

What are Free Fatty Acids (FFA)?

Free Fatty Acids (FFA) are fatty acids that have been released from triglycerides due to the breakdown of fats. This process, known as hydrolysis, occurs when oils or fat-containing materials are exposed to moisture, enzymes, or poor handling conditions.
FFA is not a direct measure of oxidation, but it is closely associated with overall oil degradation.
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Role and importance

FFA is a key indicator of hydrolytic deterioration and general fat quality.
It helps to:
‣Assess breakdown of fats due to moisture or enzymatic activity
‣Indicate poor storage or handling conditions
‣Evaluate raw material quality before use
‣Identify materials at higher risk of further oxidation
Elevated FFA levels often signal that a material has already undergone some level of degradation.

FFA in food, feed, and raw materials

FFA is widely used across different matrices, with interpretation depending on the source:
Refined food oils
‣ Typically have very low FFA due to refining processes
‣ Elevated levels indicate poor processing or degradation during storage
Oilseeds
‣ FFA can increase during storage due to enzymatic activity
‣ Mechanical damage (crushing, cracking) accelerates hydrolysis
Fishmeal
‣ FFA can rise due to residual moisture and enzymatic breakdown
‣ Often occurs alongside oxidation
Animal by-products (e.g. poultry by-product meal)
‣ Frequently show elevated FFA due to rendering conditions and storage
‣ High variability between batches is common
In feed materials, FFA is often used as a practical quality screening parameter.

Stability and
behaviour

FFA formation is driven by hydrolysis rather than oxidation.
Key characteristics:
‣ Occurs when triglycerides break down into free fatty acids and glycerol
‣ Accelerated by moisture, heat, and enzymatic activity
‣ Often precedes or accompanies oxidation
Important behaviour:
‣ High FFA increases susceptibility to oxidation
‣ FFA itself does not indicate oxidation stage, but contributes to instability
‣ Once elevated, FFA levels do not reverse
Factors influencing FFA levels:
‣ Moisture content and water activity
‣ Lipase enzyme activity (especially in oilseeds and animal tissues)
‣ Processing conditions (e.g. delayed drying, poor handling)
‣ Storage time and temperature
In practice, high FFA is often a sign of poor raw material handling or ageing.

Why analysis matters

Totox is useful for translating complex oxidation data into a single, actionable value, particularly in quality control environments.
Key reasons for analysis include:
FFA is a fundamental parameter for assessing raw material quality, particularly in feed and less refined products.
Key reasons for analysis include:
Verification
‣ Confirms whether oils and raw materials meet quality specifications
‣ Identifies degraded or poorly handled materials
Quality control
‣ Monitors consistency between batches and suppliers
‣ Detects storage or processing issues early
Formulation accuracy
‣ Helps prevent inclusion of unstable fats in finished products
‣ Supports raw material selection and acceptance decisions
Real-world impact
‣ High FFA can reduce palatability in feed
‣ Indicates increased risk of further oxidation and quality loss
‣ May affect processing behaviour and product stability
‣ In refined oils, signals loss of quality and shelf-life stability
In practice, FFA is often interpreted alongside oxidation parameters:
‣ Peroxide Value (PV) → early oxidation
‣ p-Anisidine Value (p-AV) → secondary oxidation
‣ TBA (malondialdehyde) → advanced oxidation
Together, these provide a more complete understanding of both hydrolytic and oxidative degradation
Chem Nutri Analytical is an independent, SANAS-accredited laboratory serving the food and agricultural sectors. Proudly South African, we’ve delivered reliable, science-driven testing since 2014. Bringing global benchmarking standards to local industries.
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Cedar Lake Industrial Estate
1 Harvest Place, Clayville
Olifantsfontein
Gauteng Province
1666
+27 (11) 316 8800
+27 (11) 316 8804
+27 (69) 153 7416
info@chemnutri.co.za
clientservices@chemnutri.co.za
https://chemnutri.co.za
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