Figure 43 : One of the most useless concepts is to describe the separation power in PLC by theoretical plate numbers or plate height values. The only real measure of the separation efficiency is the TRENNZAHL, a number - see above. The best possible Trennzahl we could get by focussed circular chromatography reached 50. That means: 50 peaks, bows, circles could be baseline separated on one plate. This is comparable to what a good HPLC column of 100 mm length can reach under optimized conditions.