Process for producing unsaturated fatty acid-containing oils
An edible oil obtained by culturing a microorganism belong to the genus Mortierella subgenus Mortierella in a medium containing a nitrogen source derived from soybean is discussed. The oils obtained have a low 24,25-methylenecholest-5-en-3β-ol content.
1. An edible-oil composition produced by culturing a producer microorganism belonging to the genus Mortierella in a fermentor with aeration in the presence of a nitrogen source, comprising 24,25-methylenecholest-5-en-3β-ol and desmosterol, wherein the edible-oil composition has
a 24,25-methylenecholest-5-en-3β-ol compositional ratio of 35% or lower,
a 24,25-methylenecholest-5-en-3β-ol compositional ratio in a proportion of 1.2 or less with respect to the desmosterol compositional ratio,
an arachidonic acid content of 30 to 50%,
a triglyceride content of 90% or greater, and
a total sterol content of 0.9% or more.
2. The edible-oil composition of claim 1 , wherein the producer microorganism belongs to the genus Mortierella subgenus Mortierella.
3. The edible-oil composition of claim 1 , wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio is in a proportion of 0.9 or less with respect to the desmosterol compositional ratio.
4. The edible-oil composition of claim 3 , wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio is 33% or lower.
5. The edible-oil composition of claim 4 , wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio is 30% or lower.
6. The edible-oil composition of claim 1 , wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio in is a proportion of 0.6 or less with respect to the desmosterol compositional ratio.
7. The edible-oil composition of claim 6 , wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio of 33% or lower.
8. The edible-oil composition of claim 6 , wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio is 30% or lower.
9. The edible-oil composition of claim 1 , wherein the edible-oil composition has a total sterol content of 0.9% to 1.2%.
10. The edible-oil composition of claim 1 , wherein the producer microorganism belongs to the genus Mortierella subgenus Mortierella , wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio is 30% or lower, and wherein the 24,25-methylenecholest-5-en-3β-ol compositional ratio in is a proportion of 0.6 or less with respect to the desmosterol compositional ratio.
11. An immature infant formula, infant formula, baby food or pregnancy food product comprising the edible-oil composition of claim 1 .
12. A nutritive dietary supplement comprising the edible-oil composition of claim 1 .
13. An animal food comprising the edible-oil composition of claim 1 .