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In situ poly(ethylene imine) coating of hollow fiber membranes used for microdialysis sampling

Publiceringsår: 2004
Språk: Engelska
Sidor: 879-888
Publikation/Tidskrift/Serie: Pure and Applied Chemistry
Volym: 76
Nummer: 4
Dokumenttyp: Artikel i tidskrift
Förlag: IUPAC


A method for the in situ modification of hollow fiber membranes used as sampling units for microdialysis probes is presented. The method consists of adsorption-coating, high-molecular-weight poly(ethylene imine), PEI, onto membranes, already fitted on microdialysis probes. Modification of membranes was designed to specifically explore the so-called Andrade effects and thus enhance the interaction of membranes with enzyme. The performances of polysulfone, polyethersulfone, and polyamide membranes modified with PEI-enzyrne complex were evaluated based on the membrane extraction fraction for maltose and maltotriose and membrane morphology as examined by scanning electron microscopy. Of the membranes tested, the PEI-enzyme complex least affected the performance of the polysulfone membranes. Conversion of maltoheptaose to maltotriose and maltose was increased reproducibly (within a 5 % relative standard deviation) by 50 % for modified membranes compared to the native hollow fiber membranes. The results demonstrate the potential to effectively modify membranes already fitted on a microdialysis probe. Such a procedure can be modified and employed to either promote or reduce membrane-protein interaction for hollow fibers used as microdialysis sampling units or other similar membrane applications.


  • Analytical Chemistry
  • Medical Engineering


  • ISSN: 0033-4545

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