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We report on the design and performance of in-house built column cartridges that can be directly screwed into the ports of a commercial rotor-stator valve to minimize extra-column band broadening and pressure-drop losses when pursuing ultra-fast separations such as those needed in 2D and 3D-LC separations. Two basic designs were evaluated and were compared with the results obtained with a commercial screw-in column cartridge. The system produces an extra-column band broadening as low as 0.05 to 0.1 μL2 for the employed UV-detector set-up. Despite these very
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