Selective flocculation of nucleic acids, lipids, and colloidal particles from a yeast cell homogenate by polyethyleneimine, and its scale-up. |
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Authors: | P Milburn J Bonnerjea M Hoare P Dunnill |
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Institution: | Department of Chemical and Biochemical Engineering, University College London, UK. |
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Abstract: | Nucleic acids, lipid, and colloidal particulate material can be selectively flocculated from a yeast cell homogenate by the cationic polymer polyethyleneimine (PEI). Flocculation can occur from a crude homogenate, a homogenate clarified centrifugally, or by the prior use of sodium tetraborate (borax). Flocculation from a homogenate previously clarified by the use of borax is best suited for large-scale operation. The supernatant obtained following centrifugation is effectively free of nucleic acid, lipid, and particulate material with essentially 100% soluble enzyme recovery. Enzyme specific activity increases by approximately 45% compared to a zero PEI control. |
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