Ultra-pure agonists of guanylate cyclase c, method of making and using same

Abstract

The invention provides processes of purifying a peptide including a GCC agonist sequence selected from the group consisting of SEQ ID NOs: 1-251 described herein. The processes include a solvent exchange step before a freeze-drying (lyophilization) step.

1 - 28 . (canceled) 
     
     
         29 . An oral formulation comprising:
 a purified peptide comprising the Guanylate Cyclase-C(GCC) agonist of amino acid sequence of SEQ ID NO: 1,   wherein the formulation comprises less than 2% by weight of iso-Asp2-plecanatide relative to the weight of the purified peptide.   
     
     
         30 . The oral formulation of  claim 29 , comprising less than 0.5% by weight of iso-Asp2-plecanatide relative to the weight of the purified peptide. 
     
     
         31 . The oral formulation of  claim 29 , wherein the formulation further comprises at least one pharmaceutically acceptable excipient, wherein the at least one pharmaceutically acceptable excipient comprises microcrystalline cellulose. 
     
     
         32 . The oral formulation of  claim 29 , comprising 0.01 mg to 10 mg of the purified peptide. 
     
     
         33 . The oral formulation of  claim 32 , comprising 0.1 mg to 5 mg of the purified peptide. 
     
     
         34 . The oral formulation of  claim 33 , comprising 3 mg of the purified peptide. 
     
     
         35 . The oral formulation of  claim 29 , wherein the formulation further comprises at least one pharmaceutically acceptable excipient, wherein the at least one pharmaceutically acceptable excipient comprises magnesium stearate.