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- W3033799150 abstract "Spatial multi-dimensional liquid chromatography can provide unprecedent resolving power by utilizing subsequent orthogonal separation mechanisms, while the analysis time is minimized thanks to parallel development of the analyzed fractions in each dimension. In this study, different engineering solutions have been realized aiming at achieving flow confinement and control during subsequent 1D and 2D chromatographic developments in a microfluidic device for spatial two-dimensional separations. First, the flow distributor design was optimized and physical barriers, i.e., reducing the cross section of microchannels as well as locally integrated monolithic substrates in chip segments, were assessed as a means of flow confinement. Furthermore, an on-chip active-valving, high-pressure approach was successfully developed. The flow in first-dimension separation is confined within a channel situated in a rotating axis containing through-holes. These are either closed during the 1st development or opened when aligned with the 2D flow distributor and the 2D channels after rotation of the axis by 90°, allowing for sample transfer and executing the subsequent 2D analysis. The on-chip active-valving concept has been successfully demonstrated in combination with stationary-phase analyte focusing prior to the 2D development using a microfluidic spatial 2D-LC device containing polymer monolithic stationary phases locally synthesized in the parallel 2D separation channels. Finally, this workflow was successfully employed to separate a mixture of dyes applying gradient RPLC during the 2D development." @default.
- W3033799150 created "2020-06-12" @default.
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- W3033799150 date "2020-10-01" @default.
- W3033799150 modified "2023-10-01" @default.
- W3033799150 title "Engineering solutions for flow control in microfluidic devices for spatial multi-dimensional liquid chromatography" @default.
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- W3033799150 doi "https://doi.org/10.1016/j.snb.2020.128388" @default.
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