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- W2619139048 abstract "In conventional microfluidic bioassays, short optical path length and extremely small quantities of analytes sometimes can significantly reduce detectability. Various sample preconcentration techniques have been reported for improving the detectability of bioassays. In the present study, we developed a novel preconcentration technique, “double sweeping”, utilizing cationic and anionic micelles simultaneously. Microscopic observations demonstrated that double sweeping enabled a sample solution, which initially filled a capillary, to be focused into an extremely narrow band. Initially, the sample molecules are swept from cathode to anode, or anode to cathode, based on conventional sweeping with an anionic or cationic micellar solution, respectively. Then, the fronts of the swept bands collide with each other in the capillary and halt at the interface between the bands. The sample molecules in the micellar solutions continue to move toward the interface because of the electrophoretic migration of the micelles, which results in further focusing and suppression of the band broadening due to molecular diffusion. We demonstrated that higher preconcentration efficiency was achieved using double sweeping than using conventional sweeping. In addition, double sweeping was successfully incorporated into a multiple enzyme activity assay using an arrayed reagent-release capillary, resulting in simple, rapid, simultaneous, and highly sensitive assays of caspase-3, alkaline phosphatase, and trypsin." @default.
- W2619139048 created "2017-06-05" @default.
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- W2619139048 date "2017-06-08" @default.
- W2619139048 modified "2023-09-26" @default.
- W2619139048 title "Double Sweeping: Highly Effective Sample Preconcentration Using Cationic and Anionic Micelles and Its Application to a Multiple Enzyme Activity Assay" @default.
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- W2619139048 doi "https://doi.org/10.1021/acs.analchem.7b00586" @default.
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