Biological role and natural dietary sources of linoleic acid alongside its physicochemical characteristics
Mateusz Pawlak
2026-03-21
3 min. read
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The assemblage of lipids present in the human diet is marked by extraordinary richness in form and structural diversity. Their behavior under physical and chemical conditions, as well as their impact on bodily functions, is predominantly governed by the composition of individual fatty acids. Critical parameters—including carbon chain length, the degree of unsaturation derived from the number of double bonds, and their positional arrangement within the molecule—dictate the ultimate properties of fats composed of these compounds. Attributes such as malleability, melting point, and thermal decomposition temperature play a pivotal role in both culinary arts and nutritional planning. Moreover, these very characteristics serve as the foundation for developing systematic nomenclature and classification of edible fats. Among them, linoleic acid stands out as an unsaturated fatty acid of invaluable significance to human health.
Linoic acid
Linoleic acid belongs to the long-chain acids It contains 18 carbon atoms in the chain. It is also a polyunsaturated acid because it contains two double bonds The first of these is at position n-6, i.e. at 6 carbon, which means that it is an omega-6 acid. In practice, this means that linoleic acid promotes the formation of a liquid fat consistency that is sensitive to high temperature and oxygen, and therefore to a loss of nutritional and culinary value.
Linoleic acid is active
Linoic acid (LA) is a representative of a family of polyunsaturated acids important to humans and, more specifically, omega-6s. The group of these acids belongs to the NNKT family, i.e. the essential unsaturated fatty acids that must be supplied to the body with food because they are not synthesized by humans.
Linoic acid occurrence
However, it is estimated that in the Polish population the consumption of linoleic acid should cover about 4% of the total energy consumption of grape seed, raisins, saffron and soybean oil and sunflower oil. Certain amounts are also found in rapeseed oil and even in starch in the case of animal sources the content depends on the diet of the animals concerned. However, in Poland, the population's consumption of Linoleic acid must cover approximately 4% of its total energy demand Therefore, for a person with a dietary acid that covers the demand of about 2000 calories of fat or fat from a group of LA fatty acids, it should be about 9 grams of fat.