Stopped-flow NMR at capillary scale has many advantages over traditional methods of introducing the sample into the probe, particularly when large numbers of samples must be examined. This work describes application of a simple method for direct visualization of a sample inside the flow cell of flow NMR systems to capillary scale analysis. We describe the details of the method and show how it can be used to measure the optimum flow rate for a capillary NMR system and how to determine the optimum sampling efficiency for small samples.
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