Manufacture of amides
View Patent ↗A method of producing an amide from the corresponding nitrile comprising the following steps, i) providing a microorganism capable of producing a nitrile hydratase biocatalyst, ii) culturing the microorganism in a growth medium, iii) storing the microorganism, iv) contacting the nitrile by the microorganism in an aqueous medium and thereby converting the nitrile to the amide, wherein the microorganism is stored as none actively growing free cells in a storage medium that comprises water. The stored microorganism may be as whole microbial cells, this may be in the form of a cell paste recovered from a fermentation medium; an aqueous suspension of the microbial cells, prepared using a suitable suspending medium such as water, physiological saline solution, or a suitable buffer solution, such as phosphate or comprises the fermentation broth that contains components of the fermentation culture medium and products of microbial culture. The microorganism exhibits no significant loss of activity, for example if stored even for at least 2 days, especially 3 to 28 days.
1. A method of producing an amide from the corresponding nitrile comprising the following steps,
i) providing a microorganism capable of producing a nitrile hydratase biocatalyst,
ii) culturing the microorganism in a growth medium ,
iii) storing the microorganism in a storage medium that comprises water and the growth medium in step ii),
iv) contacting the nitrile with the microorganism in the storage medium of step iii) without recovery of the microorganism using centrifugation or filtration and thereby converting the nitrile to the amide,
wherein the microorganism is stored in step iii) as a non-actively growing culture in the storage medium and the term non-actively growing culture means that the metabolism in the microorganism cells is substantially zero and the microorganism is Rhodococcus rhodochrous NCIMB 41164.
2. A method according to claim 1 in which the amide is an ethylenically unsaturated amide.
3. A method according to claim 1 in which the growth medium comprised in the storage medium of step iii) comprises urea or a urea derivative.
4. A method according to claim 1 in which the microorganism is stored at a temperature above the freezing point of the storage medium.
5. A method according to claim 1 in which the microorganism is stored for a period of at least 2 days.