The present invention relates to a concentration- and purification method for compositions containing phytanic acid and/or derivatives thereof besides other fatty acids and/or their derivatives, preferably besides polyunsaturated fatty acids and/or their derivatives, such as esters or salts. With the fractionation process the phytanic acid (derivative) can become concentrated and the fatty acid mixture, preferably PUFA-mixture, can be purified from this particular component.
