In order to fully realise the benefits of microscale mammalian cell culture and microbial fermentation systems, a device capable of online sample preparation to enable further investigation of product quality is a key requirement. The aim of this work is to move toward such a device by designing and characterising a microfluidic lysis device and microaffinity chromatography device that are compatible with each other. The resulting microfluidic lysis device is useful for preparatory lysis of microbial cells. It works by mixing a lysis reagent (BugBuster MastermixTM), with microbial culture, using a T-Piece connection. Lysis takes place in a 700µm internal diameter fused silica capillary. The device was able to successfully lyse microbial cells with similar active Glutathione S Transferase release to sonication. The operating flowrate range of the device was 3.207µL min-1 to 6.414 µL min-1 and the device volume was 30µL - 60µL. The microaffinity chromatography column performed well in studies with pure Glutathione S Transferase. It showed good loading and elution behaviour. The breakthrough and elution curves, and quantity of protein eluted per unit bed volume, were similar to lab scale. The difference being as a result of experimental error. The column also performed well with a 100% clarified Escherichia coli lysate containing recombinant Glutathione S Transferase from Schistosoma japonicum. The eluate had a purity of 55% and concentration of 2.24 mg/ml. The column was fabricated from inexpensive fused silica capillary. It had an internal diameter of 700µm, a length of 5cm (the same length as a typical lab scale Glutathione Affinity column), and a bed volume of approximately 19µL. The operating flowrate range for the column was the same as the microlysis device.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:626328 |
| Date | January 2013 |
| Creators | El-Sabbahy, H. |
| Publisher | University College London (University of London) |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://discovery.ucl.ac.uk/1419100/ |
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