Propagating an organism and related methods and compositions
First Claim
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1. A method of propagating an organism that can convert one or more monosaccharides into a biochemical, the method comprising:
- providing a first cell mass of the organism;
providing a carbon source that can support growth of the first cell mass of the organism, wherein the carbon source comprises xylose;
providing a nutrient source that can support growth of the first cell mass of the organism, wherein the nutrient source comprises a stillage component and, wherein the stillage component comprises thin stillage that is a by-product of fermenting a grain material;
combining at least the carbon source and the nutrient source to form a medium for propagating the organism, wherein the weight ratio of xylose to solids of thin stillage is in the range of from 0.5 to 2.5; and
combining the first cell mass of the organism with the carbon source and the nutrient source to propagate the first cell mass of the organism for a time period to form a second cell mass of the organism.
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Abstract
The present invention is related to methods of propagating one or more organisms by using a carbon source that includes xylose (e.g., xylose syrup from pretreating lignocellulosic feedstock) and/or a nutrient source that includes a stillage component (e.g., thin stillage derived from a corn-to-ethanol process) in the propagation medium. The organisms include those that can convert one or more monosaccharides into an alcohol via fermentation, such as yeast. The present invention is also directed to related compositions.
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Citations
18 Claims
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1. A method of propagating an organism that can convert one or more monosaccharides into a biochemical, the method comprising:
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providing a first cell mass of the organism; providing a carbon source that can support growth of the first cell mass of the organism, wherein the carbon source comprises xylose; providing a nutrient source that can support growth of the first cell mass of the organism, wherein the nutrient source comprises a stillage component and, wherein the stillage component comprises thin stillage that is a by-product of fermenting a grain material; combining at least the carbon source and the nutrient source to form a medium for propagating the organism, wherein the weight ratio of xylose to solids of thin stillage is in the range of from 0.5 to 2.5; and combining the first cell mass of the organism with the carbon source and the nutrient source to propagate the first cell mass of the organism for a time period to form a second cell mass of the organism. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of propagating an organism that can convert one or more monosaccharides into a biochemical, the method comprising:
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providing a first cell mass of the organism; providing a carbon source that can support growth of the first cell mass of the organism, wherein the carbon source comprises xylose; providing a nutrient source that can support growth of the first cell mass of the organism, wherein the nutrient source comprises a stillage component and, wherein the stillage component comprises thin stillage that is a by-product of fermenting a grain material; combining at least the carbon source and the nutrient source to form a medium for propagating the organism, wherein the first cell mass is present in an amount less than 1.0 gram of organisms per liter of medium and wherein the weight ratio of xylose to solids of thin stillage is in the range of from 0.5 to 2.5; and combining the first cell mass of the organism with the carbon source and the nutrient source to propagate the first cell mass of the organism for a time period to form a second cell mass of the organism. - View Dependent Claims (17)
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18. A system of propagating an organism that can convert one or more monosaccharides into a biochemical, the system comprising:
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a propagation vessel, comprising a composition comprising; a carbon source that can support growth of the first cell mass of the organism, wherein the carbon source comprises xylose; a nutrient source that can support growth of the first cell mass of the organism, wherein the nutrient source comprises a stillage component and, wherein the stillage component comprises thin stillage that is a by-product of fermenting a grain material; wherein the stillage component comprises thin stillage and the weight ratio of xylose to solids of thin stillage is in the range of from 0.5 to 2.5; and a first cell mass of the organism, wherein the first cell mass of the organism can use the xylose and thin stillage to propagate the first cell mass of the organism for a time period to form a second cell mass of the organism; and
an aerator coupled to the propagation vessel to aerate the composition.
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Specification