Method of purifying TFPI and TFPI analogs

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Peptide containing doai

Reexamination Certificate

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C530S350000

Reexamination Certificate

active

07851433

ABSTRACT:
Highly purified preparations of TFPI or TFPI analogs can be prepared using a method that generally involves the following steps: (1) expression of TFPI or TFPI analog inE. coli, (2) isolation of refractile bodies, (3) dissolution of the refractile bodies and refolding of the expressed TFPI or TFPI analog, (4) SP-Sepharose fast flow (FF) chromatography, (5) a first concentration and diafiltration step, (6) Q-Sepharose high (HP) performance chromatography, (7) butyl hydrophobic interaction chromatography (HIC), (8) SP-Sepharose HP chromatography, and (9) a second concentration/diafiltration step. Less than about 12% of the TFPI or TFPI analog molecules in such preparations are modified TFPI or TFPI analog species (i.e., oxidized, carbamylated, acetylated, deamidated, aggregated, or misfolded species).

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