Superba krill oil doesn't work.
I think I found out why the superba krill oil didn't work but Neptune did.
With great difficulty (probably due to my concentration problems) I studied the krill oil extraction patents:
Superba krill oil:
Neptune krill oil:
Superba krill oil is actually heated in order to extract the lipids and neutralize enzymes:
In some preferred embodiments, freshly caught krill is first subjected to a protein denaturation step. The present invention is not limited to any particular method of protein denaturation. In some embodiments, the denaturation is accomplished by application of chemicals, heat, or combinations thereof. In some embodiments, freshly caught krill is wet pressed to obtain oil and meal. In some embodiments, the meal is then heated to a temperature of about 50° C. to about 100° C. for about 20 minutes to about an hour, preferably about 40 minutes to denature the proteins.
But neptune krill oil isn't heated, it's washed with pure acetone or something:
After separation by filtration on an organic solvent resistant filter (metal, glass or paper) the residue is optionally washed with pure acetone, preferably two volumes (original volume of material) to recover yet more lipids. The combined filtrates are evaporated under reduced pressure. Optionally, flash evaporation or spray drying may be used. The water residue obtained after evaporation is allowed to separate from the oil phase (fraction I) at low temperature.
Very interesting is this:
U.S. Pat. No. 4,331,695 ([u]not neptune, but a traditional extraction method[/u]) describes a method using pressurized solvents which are gaseous
at room temperature, such as propane, butane or hexane. The extraction is performed at
preferred temperatures of 15 to 80.degree. C. on shredded vegetable or finely divided
animal products. The extracted oils are then made to precipitate under high pressure and
elevated temperatures of 50 to 200.degree. C. However, hexane is a poor extraction
solvent for marine animals such as krill. [b]Furthermore, the high temperatures used in the
precipitation step negatively alters the lipids.[/b]
So high temperatures should not be used when extracting krill oil. This explains why superba wasn't effective as the high temperatures may have destroyed the PC-DHA.
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