Photo: Kemin
Photo: Kemin

Oxidative quality of lipids: Field survey insights

Kemin
Kemin Partner Profile
07-12-2018 | |
Photo: Kemin
Photo: Kemin

It is well known that lipid oxidation compromises the nutritional quality of animal feeds. In addition, it reduces the palatability and increases presence of toxic compounds such as free radicals and aldehydes. Probably the most important aspect of oxidation is the reduction in energy.

Oxidation can be influenced by different feed production parameters, such as heat and/or high-pressure treatment and the use of pro-oxidant raw materials. In addition, oxidation is a progressive process which cannot be reverted, moreover an oxidized oil can work as a pro-oxidant for other fats or other components in the diet. This indicates the complexity of factors that need to be taken into consideration for good oxidation control management.

Today’s market shows a large variation with respect to different lipid sources applied in feed. A trend is observed for high quality diets with formulations including polyunsaturated fatty acids (PUFAs)-rich ingredients. At the same time, as fat is one of the most expensive dietary components, the selection and application of fats and oils is also price driven. These trends result in a continuous variation in the lipid market in terms of supplier and lipid source. By consequence, nutritionists are often unexpectedly faced with an increased variation in lipid quality. Therefore, in the context of a good quality management program, a full evaluation in terms of oxidation and nutritional quality of fats and oils is essential.

Kemin’s Lipid Evaluation Test

In 2014, Kemin developed and implemented a VIV award winning customer laboratory service called the Lipid Evaluation Test (LET). This innovative service tool is designed to diagnose the quality of an oil or fat in terms of oxidation and nutrition.

In brief, LET determines the correct nutritional value of a lipid, depending on its use (diets for young or adult poultry or pigs) and assesses its oxidative status and stability.

Market insight based on a field survey

Since its launch, more than 700 unique fat and oils samples have been analysed by the lipid evaluation test. Lipids have been collected over the entire EMENA region. The majority of the samples analysed by LET can be represented in five groups: soybean oil, animal fat, acid oils, sunflower oil and poultry oil. LET’s exclusive dataset reveals a large variability in nutritional values, even between identical fat sources. Furthermore, in two out of three cases of the samples analysed in LET show signs of oxidation.

Determination of the level of oxidation was based on measurements of primary and secondary oxidation products. Majority of samples for all lipids sources showed mainly oxidation in its initial phase, with the sole exception of sunflower oil where more evolved oxidation was registered. Only in a few cases, the samples were completely oxidised. Yet, the majority of samples showed first signs of oxidation, see Figure 1.

Figure 1 – Variation in the average oxidation status of acid oils, animal fats, poultry oils, soybean oil and sunflower oil tested in Kemin’s Lipid Evaluation Test since 2014.

Oxidative quality of lipids: Field survey insights


The analysed samples show mainly primary oxidation issues, as determined by peroxide values (PV). On the other hand, still 23% of the samples analysed, show signs of secondary oxidation, as measured by thiobarbituric acid (TBA). This spread in primary and secondary oxidation is visualised in Figure 2.

Figure 2 – Oxidative status measured by peroxide (PV) and thiobarbituric acid (TBA) values of acid oils, animal fats, poultry oils, soybean oil and sunflower oil tested in Kemin’s Lipid Evaluation Test. In two out of three samples analysed, oxidation was observed (red area).

Oxidative quality of lipids: Field survey insights


Solutions provided by Kemin

Supplementation of antioxidants is crucial to prevent lipid oxidation and oxidative rancidity during production, processing and storage of fats and feeds. Antioxidants are known to help preserve the sensorial quality and avoid the destruction of critical and expensive nutrients like polyunsaturated fatty acids, pigments and vitamins.

Kemin’s antioxidant portfolio offers formulas based on synthetic antioxidants with BHT (Paradigmox) and/or BHA (Termox) or formulations with pure natural antioxidants (Naturox) including a certified formula that is approved for usage in organic feedstuff.

Kemin
Kemin Partner Profile

Kemin provides “inspired molecular solutions” specifically developed to provide nutrition and health benefits for humans and animals. Committed to feed and food safety, Kemin maintains top-of-the-line manufacturing facilities where approximately 500 specialty ingredients are made for the global feed and food industries as well as the health, nutrition and beauty markets. A privately held, family-owned and operated company, Kemin has nearly 2,000 employees and operates in more than 90 countries with manufacturing facilities in Belgium, Brazil, China, India, Italy, Singapore, South Africa and the United States. Visit Kemin.com  

Kemin
Kemin Partner Profile

Kemin provides “inspired molecular solutions” specifically developed to provide nutrition and health benefits for humans and animals. Committed to feed and food safety, Kemin maintains top-of-the-line manufacturing facilities where approximately 500 specialty ingredients are made for the global feed and food industries as well as the health, nutrition and beauty markets. A privately held, family-owned and operated company, Kemin has nearly 2,000 employees and operates in more than 90 countries with manufacturing facilities in Belgium, Brazil, China, India, Italy, Singapore, South Africa and the United States. Visit Kemin.com  

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