title: Capture of bacterial endotoxins using a supermacroporous monolithic matrix with immobilized polyethyleneimine, lysozyme or polymyxin B.
abstract: Bacterial endotoxins (BEs) are integrated part of Escherichia coli, a microorganism widely used for the production of recombinant proteins. BEs should be eliminated in the course of down stream processing of target protein produced by these bacteria. Supermacroporous monolith (continuous bed) columns, so called cryogel columns, with immobilized polyethyleneimine (PEI), polymyxin B (PMB) and lysozyme were employed for BEs capture. Due to the large interconnected pores it was possible to use cryogel columns at flow rates as high as 10 ml/min. The columns packed with Sepharose CL-4B with immobilized PEI, PMB and lysozyme were impossible to use at these high flow rates due to the collapse of the bed. The dynamic capacities of the cryogel columns were nearly independent of the flow rate. In the presence of EDTA, BEs were quantitatively captured from mixtures with a model protein, bovine serum albumin (BSA) at pH 7.2 with practically no protein losses. At pH 3.6 BEs were captured directly from non-clarified E. coli cell lysate resulting in more than 10(4) times BEs clearance.
authors: Department of Biotechnology, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-22100 Lund, Sweden.
authors: Amro
authors: A
authors: Hanora
authors: Fatima M
authors: FM
authors: Plieva
authors: Martin
authors: M
authors: Hedström
authors: Igor Yu
authors: IY
authors: Galaev
authors: Bo
authors: B
authors: Mattiasson
mesh_terms: D002846:Chromatography, Affinity / Q000379:methods; D004731:Endotoxins / Q000737:chemistry / Q000302:isolation & purification*; D004800:Enzymes, Immobilized / Q000737:chemistry; D004926:Escherichia coli; D046911:Macromolecular Substances / Q000737:chemistry; D009113:Muramidase / Q000737:chemistry*; D011094:Polyethyleneimine / Q000737:chemistry*; D011112:Polymyxin B / Q000737:chemistry*; D016062:Porosity
chemical_list: D004731:Endotoxins; D004800:Enzymes, Immobilized; D046911:Macromolecular Substances; D011094:Polyethyleneimine; D009113:Muramidase; D011112:Polymyxin B