• Easier to use than glass alternative
• Can be used with a wider range of solvents
• Use them with existing tubes
• Lower in cost than glass
• Less fragile than susceptibility-altered glass microtubes
Traditionally, sample sizes were 3-5 times the height of the probe Rƒ coil. All magnetic field distorsions caused by magnetic susceptibility discontinuities at the upper air-sample and lower glass-sample interfaces were far from the sensitive probe Rƒ coil region.
Small samples diluted to larger traditional volumes (1 ml) yield poor NMR spectra in high field spectrometers.
Through magnetic susceptibility matching of the sample solvent, Doty Susceptibility Plugs allow the sample to be substantially concentrated by extending out the air-sample/glass sample interfaces far enough away from the Rƒ coil region to remove the magnetic field distorsions.
Doty Susceptibility Plugs are provided as sets ot two. Positioning rod and collar are provided as a set and ordered separately from the plug set. The upper face of both plugs has a thread that lets you firmly attach a positioning rod. The upper plug is held in the tube by the positioning rod. The rod, in turn, is held by a collar that rests on top of the tube. A special sealing collar (equipped with two o-rings) can be ordered separately for long term storage of samples where solvent evaporation can alter results. The sealing collar is used to replace the standard positioning collar on the rod.