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  Campus Chemical Instrument Center

 

Sample Preparation
1. Use clean, dry sample tubes of high quality.
2. Filter the solution. The sample must be free of insoluble particles to get the best resolution possible.
3. Try to always use the same sample volume or solution height for ease of shimming. Ideally use about 0.6 ml or 4 cm of solvent for a 5 mm tube. The minimum solution volume is 0.5 ml or about 3.5 cm. Using more than 1 ml is both wasteful and can introduce temperature instablities. For smaller volumes (0.2 ml) use a Shigemi tube or susceptibility plugs matched for the solvent. Note that you should get Bruker style Shigemi tubes which have an 8 mm base.
4. If the sample is to be run in the 2.5 mm microprobe(1H, 13C), use no more solution than what fills the capillary tube. The minimum volume is about 90 ul. These microtubes are made by Wilmad.

 

If you have any questions regarding sample preparation, do not hesitate to give us a call for help.  The better your sample prep is, the better the results will be.