Crystalline form of estradiol and pharmaceutical formulations comprising same
First Claim
Patent Images
1. A method for preparing a crystalline form of estradiol characterized by possessing at least one diffraction peak having a 2θ
- angle of 11.2°
±
0.2°
, 12.7°
±
0.2°
, 17.4°
±
0.2°
or 19.6°
±
0.2°
, said method comprising the steps of;
a) preparing a supersaturated suspension of estradiol hemihydrate crystals in an adhesive and solvent;
b) removing the solvent;
c) heating the suspension to a temperature sufficient to dissolve the estradiol hemihydrate crystals in the adhesive; and
d) transferring the suspension to conditions wherein the supersaturation ratio is greater than or equal to about 12.
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Abstract
The present invention is directed to a stable crystalline form of estradiol suitable for incorporation into pharmaceutical formulations. The invention further provides methods of preparing said crystalline form of estradiol. The invention further provides pharmaceutical formulations comprising said crystalline form of estradiol. The invention further provides a method of treatment of an individual in need of such administration by the transdermal administration of estradiol from a polymeric matrix comprising the crystal structure of estradiol of the present invention.
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Citations
18 Claims
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1. A method for preparing a crystalline form of estradiol characterized by possessing at least one diffraction peak having a 2θ
- angle of 11.2°
±
0.2°
, 12.7°
±
0.2°
, 17.4°
±
0.2°
or 19.6°
±
0.2°
, said method comprising the steps of;a) preparing a supersaturated suspension of estradiol hemihydrate crystals in an adhesive and solvent; b) removing the solvent; c) heating the suspension to a temperature sufficient to dissolve the estradiol hemihydrate crystals in the adhesive; and d) transferring the suspension to conditions wherein the supersaturation ratio is greater than or equal to about 12. - View Dependent Claims (4, 5, 6, 7, 8)
- angle of 11.2°
-
2. A method for preparing a crystalline form of of estradiol characterized by possessing at least one diffraction peak having a 2θ
- angle of 11.2°
±
0.2°
, 12.7°
±
0.2°
, 17.4°
±
0.2°
or 19.6°
±
0.2°
, said method comprising the steps of;a) preparing a supersaturated suspension of estradiol hemihydrate crystals in an adhesive and solvent; b) removing the solvent; c) heating the suspension of to a temperature sufficient to dissolve the estradiol hemihydrate crystals in the adhesive; and d) transferring the suspension to conditions of approximately 32°
C. and 80% relative humidity. - View Dependent Claims (9, 10, 11, 12, 13)
- angle of 11.2°
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3. A method for preparing a crystalline form of of estradiol characterized by possessing at least one diffraction peak having a 2θ
- angle of 11.2°
±
0.2°
, 12.7°
±
0.2°
, 17.4°
±
0.2°
or 19.6°
±
0.2°
from micronized estradiol hemihydrate (E2-HH) crystals said method comprising the steps of;a.) preparing a sample of pure micronized E2-HH in an sealed container in the absence of extraneous water; b.) heating the sample to the melting temperature of the micronized E2-HH and c.) cooling the sample at a controlled rate so as to form Crystal X. - View Dependent Claims (14, 15, 16, 17, 18)
- angle of 11.2°
Specification