Method for the preparation of lecithin
This technology relates to a method of producing light color lecithin from a lecithin-containing oil, such as crude vegetable oil. The method comprises heating the oil to a suitable temperature, contacting the oil with a peroxide solution, separating the lecithin precipitate from the oil and drying the lecithin. In a specific embodiment, the lecithin produced by the process is corn lecithin.
1. A method of extracting lecithin from a lecithin-containing oil comprising:
(a) heating the oil to a temperature of less than about 80° C.;
(b) contacting the oil with a peroxide solution, wherein the lecithin precipitates from the oil;
(c) separating the lecithin precipitate from the oil, and;
(d) drying the lecithin at a material temperature of less than about 80° C.
2. The method of claim 1 , wherein the peroxide solution is contacted with the oil such that the final concentration of peroxide in oil is about 0.01% to about 5% by weight of oil.
3. The method of claim 1 , wherein the peroxide solution is contacted with the oil such that the final concentration of peroxide in oil is about 0.01% to about 3% by weight of oil.
4. The method of claim 1 , wherein the oil is heated to a temperature from about 30° C. to about 80° C.
5. The method of claim 1 , wherein the oil is heated to a temperature no more than about 80° C.
6. The method of claim 1 , wherein the oil is corn oil.
7. The method of claim 1 , wherein the oil is selected from the group consisting of: rapeseed oil, rice bran oil, rice bran oil, corn fiber oil, corn oil, olive oil, barley oil, soybean oils, oat bran oil, cottonseed oil, canola oil, sunflower seed oil, palm oil, peanut oil, safflower oil, cashew nut oil, kapok seed oil and dill oil.
8. The method of claim 1 , further comprising the step of separating the lecithin precipitate from the oil.
9. The method of claim 8 , wherein the separating is by centrifugation or decantation.
10. The method of claim 8 , wherein the lecithin is dried at a material temperature from about 40° C. to about 80° C.
11. The method of claim 8 , wherein the lecithin is dried at a material temperature from about 55° C. to about 65° C.
12. The method of claim 8 , wherein the lecithin is dried at a pressure from about 2 to about 250 mm Hg absolute.
13. The method of claim 1 , wherein the lecithin is produced in the absence of acid.
14. The method of claim 1 , wherein the lecithin has greater than about 30% acetone insoluble (A.I.) matter.
15. The method of claim 14 , wherein the lecithin has greater than about 99% acetone insoluble (A.I.) matter.
16. The method of claim 1 , wherein the lecithin has an acid value of less than about 45 mg KOH/gram.
17. The method of claim 1 , wherein the lecithin has a moisture content from about 0% to about 6%.
18. The method of claim 1 , wherein the lecithin has a Gardner color scale of about 18 or lower on an undiluted basis.
19. The method of claim 18 , wherein the lecithin has a Gardner color scale of about 11 or lower on an undiluted basis.