CapPack™ devices are capillary-tube assemblies that are employed to test the performance of NMR hardware and to optimize pulse sequences, as well as to calibrate the chemical shift and intensity axes of NMR spectra. CapPacks consist of one or more capillary tubes (O.D.: 100-350 μm; I.D.: 25-250 μm; length: 1-25 cm) contained in a standard NMR tube (e.g., 5 mm) that subdivide the NMR sample volume (~750 µL) into smaller volumes (25-125 µL) that are isolated from each other. Depending on the proposed application, the individually glass-sealed capillaries may contain the same or different NMR-sensitive solutions. They come arranged in different geometries such as clustered or side-by-side. Here, we report on the first use of a CapPack device that consists of capillary tubes positioned on the <i>outside</i> of a standard 4-mm NMR tube and describe the advantages and several practical applications.

External CapPack™ devices

2019 Spring National Meeting

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