Page 200 - Illustrated Pocket Dictionary of Chromatography

TWO-DIMENSIONAL THIN-LAYER CHROMATOGRAPHY, 2D-TLC 203

The is a cutter used for HPLC 1/16≤ tubing. A similar but larger model is used for
GC tubing (1/8≤ and 1/4≤). The tubing is pressed between a flat plate and a cutting
wheel and rotated. The top knob is used to increase pressure at the cutting wheel
works into the tube. The implement to the right is used for opening the tube after
cutting...it has a sharp tip which remove stainless steel burrs.

This model is used for plastic tubing. The tubing is slipped through a hole under
the blade. This hole is the same diameter as the tube so that a square cut results.
The blade is then pushed down through the tube to generate the cut.

turbulent flow A condition in which a fluid flowing in a confined
space generates a flow profile that is random and fluctuating. In chro-
matography this leads to unwanted peak broadening. See laminar flow.

Two-dimensional thin-layer chromatography, 2D-TLC In
2D-TLC the plate is developed in two directions that are 90° from one
another with two different solvents.