the entire coenzymes Q$_{10 }$when measured under the condi› tion that the reduced coenzyme Q$_{10 }$ is protected from an oxidation reaction. 

13. The process according to claim 1, wherein step (a) or step (b) is conducted under an inert gas atmosphere. 

14. The process according to claim 13, wherein the inert gas atmosphere comprises nitrogen gas. 

15. The process according to claim 1, wherein the cul› turing is carried out with at least 750 L of culture medium. 

16. The process according to claim 1, further comprising 10 the step of disrupting the microbial cells. 

17. The process according to claim 1, wherein the cul› turing is conducted in a culture medium containing a carbon source, a nitrogen source, a phosphorus source and a micro- nutrient. 

* * * * * 

