Organic materials, comprising a mixture of at least two products (I) and (II), both containing isomers of conjugated long chain polyunsaturated fatty acids moieties (L.sub.1) and (L.sub.2) can be obtained by subjecting an organic material, selected from free fatty acids, mono-, di- or triglycerides, phospholipids, alkylesters or wax-esters, containing at least 5 wt. % of these conjugated polyunsaturated fatty acids, to an enzymic conversion (acidolysis, alcoholysis, esterification, hydrolysis) using an enzyme that can be discriminated between (L.sub.1) and (L.sub.2), so that original ratio L.sub.1 /L.sub.2 =X.sub.A in starting material is increased to X.sub.B, wherein X.sub.B.gtoreq.1.1 X.sub.A.

Органические материалы, состоя из смеси по крайней мере 2 продуктов (I) и (ii), обоих содержа изомеров проспряганных long chain polyunsaturated moieties наварных кислот (L.sub.1) и (L.sub.2) могут быть получены путем подвергать органический материал, выбраны от свободно наварных кислот, mono -, дву- или триглицеридов, фосфолипидов, alkylesters или вощи-3sterov, содержа по крайней мере 5 wt % этих проспряганных polyunsaturated наварных кислот, к enzymic преобразованию (ацидолизу, алкоголизу, эстерификации, гидролизу) используя энзим который можно различить (L.sub.1) и (L.sub.2), так, что первоначально коэффициент L.sub.1 /L.sub.2 = X.sub.A в первоначальном материале будет увеличен к X.sub.B, при котором X.sub.B.gtoreq.1.1 X.sub.A.

 
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