The amount of frictional heating in UHPLC was empirically estimated. Frictional heating was measured for 1.0 and 2.1 mm I.D.
UHPLC columns. The heating was equal to +4 degrees C, +8 degrees C and +16 degrees C at 300, 600 and 1000 bar, respectively.
The frictional heating effect is still important with 1.0 mm I.D. columns. The best solution to compensate frictional heating is to decrease temperature in UHPLC.