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

Los materiales orgánicos, abarcando una mezcla por lo menos de dos productos (i) y (ii), ambos isómeros que contienen de los moieties polyunsaturated con cadena larga conjugados L.sub.1 del ácido graso y L.sub.2 se pueden obtener sujetando un material orgánico, seleccionar de los ácidos grasos libres, mono -, di- o los tri-glycerides, los phospholipids, los ésteres alkyl o los encerar-e'steres conteniendo por lo menos 5 pesos % de estos ácidos grasos polyunsaturated conjugados, a una conversión enzimática usando una enzima que pueda discriminar entre L.sub.1 y L.sub.2, para aumentar el cociente original del peso de L.sub.1 /L.sub.2 = X.sub.A en el material que comienza a X.sub.B en donde X.sub.B.gtoreq.than 1.1 X.sub.A.

 
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