Low-Field, Portable, and Miniature NMR Instruments

FT-NMR instruments of 60 and 90 MHz are available from Anasazi Instruments (www.aiinmr. com) in configurations for proton, carbon, fluorine, phosphorus, and silicon studies, with common research capabilities such as 2D (COSY, HETCOR) and DEPT. The proton spectrum and peak assignments for ibuprofen and a good comparison of S/N, resolution, and second-order effects in the 60 MHz spectrum versus a 90 MHz spectrum for ibuprofen can be found in their application note at http //www.aiinmr.com/applications/60-vs-90mhz-sample-2m-ibuprofen. 

A novel miniature 45 MHz proton ET-NMR is available from picoSpin, EEC (www.picospin. com). The NMR, seen in Eigure 3.74, is based on a permanent magnet, weighs 7 lbs, and needs only 

Rgure 3.74 The miniature picoSpin-45 proton NMR. (Used with pennission of picoSpin, LLC, www.picospin.com.) 

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