Reduction of sterols and other compounds from oils
Disclosed are methods of removing and/or reducing compounds from oils (e.g., marine oils) and oils prepared by the disclosed methods. Methods of bleaching oils are also disclosed.
1. A method for preparing a composition, comprising:
a. contacting an oil with an adsorbent comprising clay to provide a mixture, wherein the clay is present in an amount of from about 5 to about 7 wt. %, based on the weight of the oil;
b. heating the mixture to from about 150° C. to about 200° C.; and
c. removing the adsorbent from the mixture, to provide the composition.
2. The method of claim 1 , wherein heating is performed for at least 1 minute.
3. The method of claim 1 , wherein heating is performed for at least 20 minutes.
4. The method of claim 1 , wherein the mixture is heated to from about 150 to about 170° C.
5. The method of claim 1 , wherein the oil is heated prior to contacting with the adsorbent.
6. The method of claim 1 , wherein the heating step is performed at less than or equal to about 1 Torr.
7. The method of claim 1 , wherein the heating step is performed at less than or equal to about 0.01 Torr.
8. The method of claim 1 , wherein the mixture is mixed before, during, or after the heating step.
9. The method of claim 1 , wherein the adsorbent further comprises silica.
10. The method of claim 1 , wherein the adsorbent comprises silica and clay in a weight ratio of about 1:1.
11. The method of claim 1 , wherein the oil comprises a marine oil.
12. The method of claim 1 , wherein the oil comprises a fish oil.
13. The method of claim 1 , wherein the oil comprises an Atlantic fish oil, Pacific fish oil, Mediterranean fish oil, light pressed fish oil, alkaline treated fish oil, heat treated fish oil, light and heavy brown fish oil, tuna oil, bonito oil, sea bass oil, halibut oil, spearfish oil, barracuda oil, cod oil, menhaden oil, sardine oil, pilchard oil, anchovy oil, capelin oil, Atlantic cod oil, Atlantic herring oil, Atlantic mackerel oil, Atlantic menhaden oil, salmonids oil, or combination thereof.
14. The method of claim 1 , wherein the oil comprises a plant oil, animal oil, microbe oil, or edible oil.
15. The method of claim 1 , wherein the oil comprises a crude oil, a semi-refined oil, a refined oil, or a re-esterified oil.
16. The method of claim 1 , wherein the oil comprises a fish oil comprising an EPA to DHA wt. % ratio of about 18:12.