Isolation of a thermophilic alkaline phosphatase by either hydrophobic or procion red sepharose chromatography

Application of perfluorocarbons in novel continuous counter-current protein chromatography

In this work the development of a process capable of extracting proteins from particulate-containing solutions (such as fermentation broths) on a continuous basis, and in which absorbent and process streams are contacted counter-currently is described. The process consists of four stages, required for the loading, washing, elution and regeneration of the adsorbent. Because of its counter-current nature, it has improved performance over existing (though not yet commercialized) continuous processes, which have been based on CSTR-type contractors (e.g. PERCAS (McCreath et al., 1993). The improved efficiency has been shown by carrying out extraction of lysozyme from a single component feed stream. The adsorbent used in this work is a Procion Red HE-7B-derivatized perfluorocarbon support, which has shown particular suitability for continuous processes due to its inherently high mechanical strength and high density. Results illustrating yields obtained using this equipment are presented and discussed.

Hydrophobic interaction chromatography

Hydrophobic interaction chromatography (HIC) is emerging as a useful technique for the separation of biological compounds. Advances in the past two years in HIC applications, stationary phases, eluents, and theory are reviewed. Recent applications of HIC processes include analytical and semi-preparative separations of a variety of proteins, such as isolectins, hemoglobins, calmodulin, and cardiotoxins. Additionally, HIC is being employed as a tool to investigate protein properties and mechanisms. Advances in HIC stationary phases include development of non-porous, microparticulate supports as well as supports with pore sizes up to 1000 Angstroms. Studies of HIC eluents have further shown the effects of mobile phase pH, water-structuring characterization, and surface tension increments on retention. Various retention mechanisms which have been presented are reviewed; and a correlation relating resolution to column and solute parameters is presented. Protein conformational effects at specific sites have been shown to have a significant impact on retention and specific examples illustrating such effects are discussed.