News and Events
Fall 2010 Seminars
The Design of Advanced Functional Membranes for Bioseparations
Chemical and Biomolecular Engineering
Thursday, September 23, 2010
10:00 a.m. – 11:00 a.m.
102 Chemistry Building
Market demand is increasing rapidly for biotherapeutics such as recombinant proteins, monoclonal antibodies, viral vaccines and plasmid DNA. With the advent of molecular biotechnology and engineered cell lines, upstream production processes have made unprecedented progress in the last decade, shifting the production burden to the downstream processing. To improve process economics and meet market demand, manufacturers will require higher productivity and higher resolution separation techniques - membrane chromatography fulfills these requirements.
In this talk, I will describe our efforts to develop adsorptive membranes for use as chromatography media. I will describe the design and performance characterization of these materials and dispel two common misperceptions by showing that
- membrane chromatography can be a higher capacity process than resin chromatography in the purification of biologics, and
- membrane chromatography can be a higher resolution process than resin chromatography.
Our design approach is to graft polyelectrolyte nanolayers from the pore surfaces of macroporous membranes using a controlled polymerization method. I will show that our strategy enables independent control over degree of polymerization and areal density of polymer chains grafted from the membrane surfaces. In this way, we are able to study the role of nanolayer architecture on membrane performance.
Using a number of examples, I will demonstrate that the dynamic binding capacities of proteins and DNA can be dramatically higher for well-designed macroporous membrane adsorbers than for existing commercial membrane adsorbers and resin columns. Using controlled polymerization and high polymer chain density produces adsorptive membranes with high binding capacities that are independent of flow rate, enabling high-throughput operation.