CO2 and fluorinated solvent-based technologies for protein microparticle precipitation from aqueous solutions

Marazban Sarkari, Inaas Darrat, Barbara L. Knutson

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Precipitation with a compressed or supercritical fluid antisolvent (PCA) has been used to produce microparticles of biologically active proteins, pharmaceuticals, and polymers. However, the application of PCA to a wider range of proteins is limited by the low mutual solubility of water (necessary to dissolve most proteins) and CO2 (traditionally used as the compressed antisolvent). This investigation extends PCA to proteins in aqueous solutions by utilizing ethanol as a cosolvent to enhance the antisolvent properties of CO2 toward aqueous systems. α-Chymotrypsin, a model protein, was precipitated from both compressed CO2 and a liquid fluorinated antisolvent, a hydrofluoroether (HFE). The equilibrium phase behavior of the antisolvent/ethanol/water systems was examined to identify a one-phase region suitable for protein precipitation. Spherical protein microparticles with a primary particle size of approximately 0.2-0.6 μm were recovered using both the compressed CO2 and fluorinated antisolvents. Although the proteins retained significant activity using both antisolvent systems, the HFE-precipitated chymotrypsin retained higher activity than the CO2-precipitated protein.

Original languageEnglish
Pages (from-to)448-454
Number of pages7
JournalBiotechnology Progress
Volume19
Issue number2
DOIs
StatePublished - Mar 2003

ASJC Scopus subject areas

  • Biotechnology

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