Intracapillary temperature

Another important application of hyphenated NMR methods is to provide insights into processes that affect the separation. Eor example, online NMR detection of the water chemical shift was used to noninvasively probe intracapillary temperatures in CE separations with subsecond temporal resolution and spatial resolution on the order of 1 mm [111]. Lacey et al. [112] followed up this report with a second NMR study using a novel 2-turn vertical solenoidal coil to measure temperature increases of more than 50 C in a chromatographic frit of the type used in CEC. Insights into the mechanisms underlying cITP have also been investigated utilizing online NMR... 

Fig. 2. (left) Graph of electrical current vs. time during a CE-NMR thermometry experiment, (right) Corresponding plot of intracapillary temperature vs. time. The peak in the temperature corresponds to the passage of the lower conductivity NaCl solution through the NMR coil. (Reprinted with permission from ref. 24, Copyright 2000 American Chemical Society.)... 

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