Granted Patent
B2
US 12,371,721 · App. 18/220,975 · Granted Jul 29, 2025
Methods of recovering oil from microorganisms
Assignee:
MARA Renewables Corporation
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Abstract
Provided herein are methods of recovering oil from microorganisms. The methods are useful, for example, in obtaining nutritional oils and/or lipid biofuels. The methods of recovering oil described herein include contacting a population of microorganisms with one or more enzymes under conditions that cause disruption of the microorganisms, concentrating the disrupted microorganisms, and extracting lipids from the disrupted microorganisms at high temperature in the presence of a salt and in the absence of solvent.
Claims (30)
1. A method of recovering oil from oil-producing microorganisms comprising
(a) culturing the microorganisms in an aqueous fermentation medium comprising aqueous components;
(b) contacting the microorganisms in the aqueous fermentation medium with an enzyme under conditions that causes enzymatic hydrolysis of the microorganisms, wherein the hydrolyzed microorganisms comprise the oil;
(c) separating the hydrolyzed microorganisms comprising the oil from the aqueous fermentation medium;
(d) extracting the oil from the separated hydrolyzed microorganisms of step (c) in the absence of an organic solvent, wherein extraction separates the oil from the hydrolyzed microorganisms; and
(e) recovering the oil of step (d).
2. The method of claim 1 , wherein the fermentation medium has a salt concentration of from about 5 g/L to about 20 g/L.
3. The method of claim 2 , wherein the salt comprises sodium chloride.
4. The method of claim 1 , wherein the contacting step is performed in the presence of 0.05% to 1% enzyme.
5. The method of claim 1 , wherein the contacting step is performed in the presence of 0.001% to 0.4% enzyme.
6. The method of claim 1 , wherein the contacting step is performed at a pH of from 5 to 8.5.
7. The method of claim 1 , wherein the contacting step is performed at a temperature of from about 50° C. to about 70° C.
8. The method of claim 1 , wherein the enzyme is a protease.
9. The method of claim 1 , wherein a concentration of salt from 1% to 5% (w/v) is added during the extraction step.
10. The method of claim 9 , wherein the concentration of salt added during the extraction step is from 4% to 5% (w/v).
11. The method of claim 9 , wherein the salt comprises sodium sulfate.
12. The method of claim 1 , wherein the oil-producing microorganisms are selected from the group consisting of algae, fungi, bacteria and protists.
13. The method of claim 1 , wherein the oil-producing microorganisms are selected from the genus Thraustochytrium, Schizochytrium and mixtures thereof.
14. The method of claim 1 , wherein the oil comprises docosahexaenoic acid.
15. The method of claim 1 , wherein 80-90% of the aqueous components are separated from the hydrolyzed microorganisms comprising the oil.
16. The method of claim 1 , wherein the contacting step is performed at pH 8.0.
17. The method of claim 1 , wherein the extraction step is performed at a temperature of 85° C.
18. The method of claim 1 , wherein the separating step comprises centrifugation.
19. The method of claim 1 , wherein at least 80% of the oil is recovered.
20. The method of claim 1 , wherein at least 90% of the oil is recovered.
21. The method of claim 1 , wherein the contacting step is performed at a pH of 7.4.
22. The method of claim 1 , wherein the contacting step is performed at a pH of 7.6.
23. The method of claim 1 , wherein the oil comprises eicosapentaenoic acid.
24. The method of claim 1 , wherein the oil-producing microorganisms are from the order Thraustochytriales.
25. The method of claim 1 , wherein 70-90% of the oil is recovered.
Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST
Recorded Jul 12, 2023
From: DENNIS, DOROTHY A.; ARMENTA, ROBERTO E.
To: MARA RENEWABLES CORPORATION
Reel/Frame 064224/0245 →
Continuity (6)
Provisional Application
61918886
· Dec 20, 2013
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