Abstract
Free-flow electrophoresis techniques have been applied for separations in various areas of chemistry and biochemistry. Here we focus on the generation of a free-flow electrophoresis chip and direct monitoring of the separation of different molecules in the separation bed of the miniaturized chip. We demonstrate a fast and efficient way to generate a low-cost micro-free-flow electrophoresis (μFFE) chip with a filling capacity of 9.5 μL based on a multi-lamination technique. Separating webs realized by two transfer-adhesive tapes avoid the problem of gas bubbles entering the separation area. The chip is characterized by isoelectric focusing markers (IEF markers). The functionality of the chip is demonstrated by free-flow isoelectric focusing (FFIEF) of the proteins BSA (bovine serum albumin) and avidin and a single-stranded DNA (ssDNA) fragment in the pH range 3 to 10. The separation voltage ranges between 167 V cm−1 and 422 V cm−1, depending on the application.
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Acknowledgements
Funding for this research was provided by the German Federal Ministry of Education and Research (grant no. 01RI0643A). We thank Dr Joachim Bertram from IBA Biologics GmbH and all our partners in this joint project for advice and support while performing this study.
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This work is dedicated to the memory of Dr. Volker Beushausen who passed away in the course of the project.
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Walowski, B., Hüttner, W. & Wackerbarth, H. Generation of a miniaturized free-flow electrophoresis chip based on a multi-lamination technique—isoelectric focusing of proteins and a single-stranded DNA fragment. Anal Bioanal Chem 401, 2465–2471 (2011). https://doi.org/10.1007/s00216-011-5353-0
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DOI: https://doi.org/10.1007/s00216-011-5353-0