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Algae are a significant part of biodiversity and studies on their bioactive   compounds are numerous. The aim of this work was to study the fatty acid   profile of Cystoseira sauvageauana and Laurencia pinnatifida collected from   the Algerian coast. Different conventional and alternative methods were used   for lipids extraction and GCMS analysis for fatty acids methyl esters   identification. The lipids content was low (&lt;1%) for the two species while   the highest yield was obtained by Folch method assisted with a pulsed   electric field. The identified fatty acids in both species ranged from C14   to C20 carbon atoms, of which palmitic acid was the major compound.   Regarding polyunsaturated fatty acids, in C. sauvageauana arachidonic acid   (C20:4) was the major constituent in extraction methods using the   chloroform: methanol mixture as solvent, while in the method using hexane,   linoleic acid (C18:2) was found as the main constituent. In L. pinnatifida,   eicosapentaenoic acid (C20:5) was the major fatty acid followed by   arachidonic acid. In comparison between the two species the best   polyunsaturated fatty acids/saturated fatty acids ratio was found in   ultrasound assisted methods in C. sauvageauana. The omega-6/omega-3 ratio   was considered satisfactory for both species; however, it was better in L.   pinnatifida. The obtained results showed the influence of the solvent and   the extraction method on the total lipid yield and the fatty acids   composition in algal extracts. In addition, these two species could find an   application in the field of food and pharmaceuticals.

Fatty acids composition of Cystoseira sauvageauana and Laurencia pinnatifida collected from the Algerian coast