Hydroxypropyl beta-cyclodextrin compositions and methods
This disclosure provides mixtures of beta-cyclodextrin molecules substituted at one or more hydroxyl positions by hydroxypropyl groups, the mixture optionally including unsubstituted beta-cyclodextrin molecules, for use as a pharmaceutically active ingredient; methods of making such mixtures; methods of qualifying such mixtures for use in a pharmaceutical composition suitable for intrathecal or intracerebroventricular administration; pharmaceutical compositions suitable for intrathecal or intracerebroventricular administration comprising such mixtures; and methods of using the pharmaceutical compositions for treatment of Niemann-Pick disease Type C.
1. A composition comprising mixture of beta-cyclodextrin molecules substituted at one or more hydroxyl positions by hydroxypropyl groups, wherein: the mixture comprises less than 0.3% unsubstituted beta-cyclodextrin (“DS-0”) or less than 1% beta-cyclodextrin substituted with one hydroxypropyl group (“DS-1”), wherein the composition is suitable for intrathecal, intravenous, or intracerebroventricular administration to a patient in need thereof, wherein the composition comprises no more than 0.01% propylene glycol.
2. The composition of claim 1 , wherein the mixture comprises less than 0.1% DS-0 and less than 0.1% DS-1.
3. The composition of claim 1 , wherein the mixture comprises less than 0.05% DS-0 and less than 0.05% DS-1.
4. The composition of claim 1 , wherein the mixture comprises less than 0.03% DS-0 and less than 0.03% DS-1.
5. The composition of claim 1 , wherein the mixture comprises less than 0.01% DS-0 and less than 0.03% DS-1.
6. The composition of claim 1 , wherein the amount of DS-0 or DS-1 is determined by peak height of an electrospray MS spectrum.
7. The composition of claim 1 , wherein the mixture has an average molar substitution (“MS”) in the range of 0.40-0.80.
8. The composition of claim 1 , wherein the mixture has an average degree of substitution (“DS a ”) of about 3 to about 7.
9. The composition of claim 1 , wherein the mixture has an average degree of substitution (“DS a ”) of about 6 to about 7.
10. The composition of claim 1 , wherein the composition purified by absorption chromatography, alumina, solvent precipitation, or a combination thereof.
11. The composition of claim 1 , wherein the composition comprises no more than 1 ppm propylene oxide.
12. The composition of claim 1 , wherein the total amount of other unspecified impurities is less than or equal to 0.05%.
13. The composition of claim 1 , wherein the composition has a concentration of about 10 mg/mL to about 200 mg/mL.
14. The composition of claim 1 , wherein the wherein the composition is suitable for administration to a pediatric patient.
15. The composition of claim 1 , wherein the wherein the composition is suitable for administration to an adult patient.
16. The composition of claim 1 , further comprising a pharmaceutically acceptable diluent.
17. The composition of claim 1 , wherein a 20% (w/v) solution of the composition in 1 mL of distilled water is capable of solubilizing 2 mg unesterified cholesterol at room temperature when measured by UV spectrometry after 24 hours.