Chlorite formulations and methods of preparation and use thereof
Described herein are chlorite formulations having a pH between about 7 and about 8.5, wherein the chlorite formulations are substantially free of deleterious non-chlorite components. Described herein are chlorite formulations, including pharmaceutical formulations, which are formulated for systemic, parenteral, or intravenous administration. Described herein are methods of preparing and methods of using the chlorite formulations described herein.
1. A method of preparing pharmaceutically acceptable sodium chlorite comprising:
(i) concentrating a sodium chlorite solution to precipitate impurities and form a concentrated sodium chlorite solution and precipitated impurities;
(ii) removing said precipitated impurities from said concentrated sodium chlorite solution;
(iii) cooling said concentrated sodium chlorite solution to induce crystals to separate from said concentrated sodium chlorite solution; and
(iv) harvesting said crystals to yield pharmaceutically acceptable sodium chlorite;
wherein said pharmaceutically acceptable sodium chlorite contains an amount of chlorate ion, wherein said amount of chlorate ion is less than about 1.5% by weight, or
wherein said pharmaceutically acceptable sodium chlorite contains an amount of sulfate ion, wherein said amount of sulfate ion is less than about 0.7% by weight, or
wherein said pharmaceutically acceptable sodium chlorite contains an amount of chloride ion, wherein said amount of chloride ion is less than about 1.9% by weight.
2. The method of claim 1 , wherein step (i) is performed at a temperature between about 60° C. to about 100° C.
3. The method of claim 1 , wherein step (ii) is performed by filtration.
4. The method of claim 1 , wherein step (iii) is performed at a temperature below about 10° C.
5. The method of claim 1 , wherein step (iv) is performed by filtration.
6. The method of claim 1 , wherein said pharmaceutically acceptable sodium chlorite contains an amount of chlorate ion, wherein said amount of chlorate ion is less than about 1.5% by weight.
7. The method of claim 1 , wherein said pharmaceutically acceptable sodium chlorite contains an amount of sulfate ion, wherein said amount of sulfate ion is less than about 0.7% by weight.
8. The method of claim 1 , wherein said pharmaceutically acceptable sodium chlorite contains an amount of chloride ion, wherein said amount of chloride ion is less than about 1.9% by weight.
9. A method of preparing a pharmaceutical formulation of sodium chlorite comprising dissolving pharmaceutically acceptable sodium chlorite prepared according to claim 1 in an aqueous solvent suitable for intravenous administration.
10. The method of claim 9 , further comprising a pH-lowering step wherein said pH-lowering step comprises adding a pH adjusting agent.
11. The method of claim 10 , wherein said pH-lowering step is performed without lowering pH below 7.
12. The method of claim 10 , wherein said pH-lowering step is performed without exposing said pharmaceutically acceptable sodium chlorite to local acidity below 7.
13. The method of claim 10 , wherein said pharmaceutical formulation of sodium chlorite has a pH between 7 and 11.5.
14. The method of claim 10 , wherein said pharmaceutical formulation of sodium chlorite has a pH between 7 and 9.
15. The method of claim 10 , wherein said pH adjusting agent is a phosphate buffer.
16. The method of claim 9 , wherein said aqueous solvent is saline.
17. The method of claim 9 , wherein said pharmaceutical formulation of sodium chlorite is a sterile intravenous formulation.
18. The method of claim 17 , wherein said sterile intravenous formulation is for treatment of a neurodegenerative disorder.
19. The method of claim 18 , wherein said neurodegenerative disorder is amyotrophic lateral sclerosis (ALS).