Polymorphs of sodium 4-[(4-chloro-2-hydroxybenzoyl) amino] butanoate

1. A crystalline polymorph of anhydrous sodium 4-[(4-chloro-2-hydroxybenzoyl)amino]butanoate exhibiting an X-ray powder diffraction pattern substantially as shown in FIG. 1 .

2. A crystalline polymorph of anhydrous sodium 4-[(4-chloro-2-hydroxybenzoyl)amino]butanoate exhibiting an X-ray powder diffraction pattern having peaks in degrees 2Θ±0.2° 2Θ at 5.2, 11.2, 15.7, 18.5, 20.1, 21.8, 23.4, 23.8, 26.9, and 29.8.

3. The crystalline polymorph of claim 2 , wherein the crystalline polymorph has a melting point onset as determined by differential scanning calorimetry at about 215.07° C.

4. A composition comprising

(a) a crystalline polymorph of any one of claims 1 – 3 ; and

(b) a biologically active agent.

5. The composition of claim 4 , wherein the biologically active agent comprises at least one protein, polypeptide, peptide, hormone, polysaccharide, mucopolysaccharide, small polar organic molecules, carbohydrate, or lipid.

6. The composition of claim 4 , wherein the biologically active agent is selected from the group consisting of growth hormones, human growth hormones (hGH), recombinant human growth hormones (rhGH), bovine growth hormones, porcine growth hormones, growth hormone-releasing hormones, interferons, α-interferon, β-interferon, γ-interferon, interleukin-1, interleukin-2, insulin, porcine insulin, bovine insulin, human insulin, human recombinant insulin, insulin-like growth factor(IGF), IGF-1, heparin, unfractionated heparin, heparinoids, dermatans, chondroitins, low molecular weight heparin, very low molecular weight heparin, ultra low molecular weight heparin, calcitonin, salmon calcitonin, eel calcitonin, human calcitonin, erythropoietin (EPO), atrial naturetic factor, antigens, monoclonal antibodies, somatostatin, protease inhibitors, adrenocorticotropin, gonadotropin releasing hormone, oxytocin, leutinizing-hormone-releasing-hormone, follicle stimulating hormone, glucocerebrosidase, thrombopoietin, filgrastim, prostaglandins, cyclosporin, vasopressin, cromolyn sodium, sodium chromoglycate, disodium chromoglycate, vancomycin, desferrioxamine, bisphosphonates, alendronate, tiludronate, etidronate, clodronate, pamidronate, olpadronate, incadronate, BIBN-4096BS, parathyroid hormone, fragments of parathyroid hormone, antimicrobials, daptomycin, anti-fungal agents, vitamins, analogs, fragments, mimetics and polyethylene glycol-modified derivatives of these compounds, and any combination thereof.

7. The composition of claim 6 , wherein the biologically active agent is insulin.

8. A dosage unit form comprising:

(A) the composition of claim 4 ; and

(B) (a) an excipient

(b) a diluent,

(c) a disintegrant,

(d) a lubricant,

(e) a plasticizer,

(f) a colorant,

(g) a dosing vehicle, or

(h) any combination thereof.

9. A dosage unit form comprising:

(A) the composition of claim 8 ; and

(B) (a) an excipient

(b) a diluent,

(c) a disintegrant,

(d) a lubricant,

(e) a plasticizer,

(f) a colorant,

(g) a dosing vehicle, or

(h) any combination thereof.

10. A method of administering an active agent to an animal in need thereof, the method comprising the step of administering the composition of claim 4 to the animal.

11. A method of treating diabetes in an animal in need thereof, comprising the step of administering a composition of claim 7 to the animal.

12. A method of treating diabetes in a human in need thereof, comprising the step of administering a composition of claim 7 to the human.

13. A method of preparing Form I of sodium 4-[(4-chloro-2-hydroxybenzoyl)amino]butanoate comprising the steps of:

(a) dissolving 4-[(4-chloro-2-hydroxybenzoyl)-amino]butanoic acid in an organic solvent to form a solution;

(b) adding a sodium source to the solution;

(c) heating the solution to reflux; and

(d) cooling the solution to yield Form I of sodium 4-[(4-chloro-2-hydroxybenzoyl)amino]butanoate.

14. A method of preparing Form I of sodium 4-[(4-chloro-2-hydroxybenzoyl)amino]butanoate comprising the step of heating Form II of sodium 4-[(4-chloro-2-hydroxybenzoyl)amino]butanoate, Form IV of sodium 4-[(4-chloro-2-hydroxybenzoyl)amino]butanoate, or a mixture thereof to above its solid state transition temperature.