Method for drying a protein composition, a dried protein composition and a pharmaceutical composition comprising the dried protein
The present invention relates to a method for spray-drying of protein solutions and the spray-dried protein product. The invention also relates to pharmaceutical compositions containing such spray-dried protein, to methods of treating diabetes and hyperglycaemia using the spray-dried protein of the invention and to the use of such spray-dried protein in the treatment of diabetes and hyperglycaemia.
1. A process for drying a protein solution to obtain a dried protein with a specified pH, the process comprising:
a) selecting a target pH for the dried protein, wherein the target pH for the dried protein is between 6.0 and 8.5,
b) selecting a target pH for the protein solution wherein the target pH for the protein solution is at least about 0.5 pH units above the target pH for the dried protein selected in step (a), and wherein the target pH for the protein solution is between 7.4 and 11.0,
c) obtaining the protein solution at a temperature below 8° C. by steps (i)-(v), wherein the steps (ii)-(v) can be carried out in any order while stirring continuously,
i. providing an aqueous phase,
ii. adding a protein,
iii. optionally adding excipients,
iv. adjusting the pH with a non-volatile base and optionally a non-volatile acid to the target pH for the dried protein selected in step (a),
v. adjusting the pH with a volatile base to the target pH for the protein solution selected in step (b), and
d) drying the protein solution resulting from step (c) to obtain a dried protein with a pH selected in step (a),
and wherein the protein is selected from the group consisting of insulin, insulin analogues, insulin derivatives, GLP-1, GLP-1 analogues, GLP-1 derivatives, glucagon and/or any combination thereof.
2. The process according to claim 1 , wherein step (v) comprises adjusting the pH of the protein solution by at least 0.5 pH unit with the volatile base.
3. The process according to claim 1 , comprising in step (iii) adding an excipient selected from a buffer, a detergent, a stabilizer, a protease inhibitor, a flavour, a carrier, an absorption protracting agent, a bulking agent, an agent improving the flowing properties, a penetration enhancer, or a combination hereof.
4. The process according to claim 1 , comprising in step (iii) adding glycylglycine and/or phenol.
5. The process according to claim 4 , comprising in step (iii) adding about 4 moles of phenol per mole of protein.
6. The process according to claim 1 , wherein the drying method is selected from the group consisting of spray drying, spray freeze drying, fluid bed drying, freeze drying and vacuum drying.
7. The process according to claim 1 , wherein the target pH of the protein solution in step (b) is at least about 0.7 pH units above the target pH of the dried protein.
8. The process according to claim 7 , wherein the target pH of the protein solution in step (b) is at least about 0.9 pH units above the target pH of the dried protein.