Abstract
The potential of biased cyclical electrical field-flow fractionation (BCyElFFF), which applies the positive cycle voltage longer than the negative cycle voltage, for characterization of submicron particles, was investigated. Parameters affecting separation and retention such as voltage, frequency, and duty cycle were examined. The results suggest that the separation mechanism in BCyElFFF in many cases is more related to the size of particles, as is the case with normal ElFFF, in the studied conditions, than the electrophoretic mobility, which is what the theory predicts for CyElFFF. However, better resolution was obtained when separating using BCyElFFF mode than when using normal CyElFFF. BCyElFFF was able to demonstrate simultaneous baseline separations of a mixture of 0.04-, 0.1-, and 0.2-μm particles and near separation of 0.5-μm particles. This study has shown the applicability of BCyElFFF for separation and characterization of submicron particles greater than 0.1-μm in size, which had not been demonstrated previously. The separation and retention results suggest that for particles of this size, retention is based more on particle size than on electrophoretic mobility, which is contrary to existing theory for CyElFFF.
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We gratefully acknowledge research grants from the Thailand Research Fund (TRF) and Center for Innovation in Chemistry: Postgraduate Education and Research Program in Chemistry (PERCH-CIC), Commission on Higher Education, Ministry of Education, Thailand, and the Office of the Higher Education Commission and Mahidol University under the National Research Universities Initiative. Financial support was from the Huachiew Chalermprakiet University and Thailand Research Fund through the Royal Golden Jubilee Ph.D. Program (Grant No. PHD/0035/2554) to M.O. Support for B.K.G was provided in part by the National Institutes of Health under grant 1R21GM107894
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Ornthai, M., Siripinyanond, A. & Gale, B.K. Biased cyclical electrical field-flow fractionation for separation of submicron particles. Anal Bioanal Chem 408, 855–863 (2016). https://doi.org/10.1007/s00216-015-9173-5
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DOI: https://doi.org/10.1007/s00216-015-9173-5