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- W2059029651 abstract "This feasibility study deals with the separations of proteins by an on-line combination of zone electrophoresis (ZE) with isotachophoresis (ITP) on a poly(methylmethacrylate) column-coupling (CC) chip with integrated conductivity detection. ITP and ZE provided specific analytical functions while performing the cationic mode of the separation. ITP served, mainly, for concentrations of proteins and its concentrating power was beneficial in reaching a low dispersion transfer (injection) of the proteinous constituents, loaded on the CC chip in a 960 nL volume, into the ZE separation stage. This was complemented by an electrophoretically driven removal of the sample constituents migrating in front of the focused proteins from the separation system before the ZE separation. On the other hand, ZE served as a final separation (destacking) method and it was used under the separating conditions providing the resolutions and sensitive conductivity detections of the test proteins. In this way, ITP and ZE cooperatively contributed to low- or sub-microg/mL concentration detectabilities of proteins and their quantitations at 1-5 microg/mL concentrations. However, a full benefit in concentration detectabilities of proteins, expected from the use of the ITP-ZE combination, was not reached in this work. Small adsorption losses of proteins and detection disturbances in the ZE stage of separation, very likely due to trace constituents concentrated by ITP, appear to set limits in the detection of proteins in our experiments. The ITP-ZE separations were carried out in a hydrodynamically closed separation compartment of the chip with suppressed hydrodynamic and electroosmotic flows of the electrolyte solutions. Such transport conditions, minimizing fluctuations of the migration velocities of the separated constituents, undoubtedly contributed to highly reproducible migrations of the separated proteins (fluctuations of the migration time of a particular protein were typically 0.5% RSD in repeated ITP-ZE runs)." @default.
- W2059029651 created "2016-06-24" @default.
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- W2059029651 date "2004-11-01" @default.
- W2059029651 modified "2023-10-16" @default.
- W2059029651 title "Separation of proteins by zone electrophoresis on-line coupled with isotachophoresis on a column-coupling chip with conductivity detection" @default.
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- W2059029651 doi "https://doi.org/10.1002/elps.200406080" @default.
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