Concentrated and odorless omega 3 fatty acids

A blend of triglycerides having the general formula CH2(OOC-R1)-CH(OOC-R2)-CH2(OOC-R3), wherein at least about 50% of the R1, R2 and R3 groups have a chain length of C19 or more. The blend of triglycerides has less than about 50 parts per billion (ppb) of trimethyl amine, that is, they are substantially odor free. Also provided is a process for preparing an enriched blend of triglycerides by taking an oil comprising a mixture of polyunsaturated fatty acids and reacting the oil with a lower alcohol to form a mixture of esters. The mixture of esters is then distilled to remove a portion of the esters having a chain length of about C18 and below to form an enriched stream of enriched esters having at least about 50% of the esters with chain length of about C20 or more. The enriched stream of esters is then reacted with glycerine to form a triglyceride mixture, wherein the triglyceride mixture has less than about 10%, by weight of diglycerides and less than about 5%, by weight monoglycerides. The triglyceride mixture preferably comprises less than 5% diglyceride and less than 1% monoglyceride. The triglyceride mixture most preferably comprises less than 2.5% diglyceride and less than 0.2% monoglyceride. Finally, the triglyceride mixture may optionally be treated by water washing, bleaching, evaporation, steam stripping and mixtures of these, to remove residual free fatty acids, aldehydes, color bodies, odor bodies, peroxides and esters.