Figure 4a: 500 MHz 13C NMR part spectra representing different chemical shift regions of algal oils of biomasses of Tetraselmis aff chuii (TSG4F2SPSE), Chlorella vulgaris (CHLWCSPSE) and Spirulina platensis (SPRM6E). Regions: 126-133 ppm = unsaturated regions (CH=CH), 14-14.35 ppm = terminal methyls of n-3, n-6 and n-9 fatty esters, 60-72 ppm = ester groups (OCH sn2; OCH2 sn1, sn3). Signals marked 1, 1 = C22:6; 2, 2 = C18:3; 3,4 = C20:5; 5, 6 = C18:2.