Thin-layer chromatography of chlorophylls and their derivatives on cellulose layers.

A method for the separation and identification of chlorophyll a and b, pheophytin a and b, pheophorbide a and b, chlorin e6, rhodin g7, and the corresponding chlorophyll a' and b' derivatives, as well as the saponification products of pheophorbide a and b, by thin-layer chromatography on commercial cellulose layers on the micro-scale has been developed. Two solvent systems were used: light petroleum (b.p.60-80 degrees)-pyridine (9:1, v/v) and n-heptane-pyridine (7:3, v/v). The former was suitable for chlorophylls, pheophytins and pheophorbides, and the latter for pheophorbides, chlorin, rhodin and their esters. The separation of the derivatives was good and no chemical alteration of the derivatives could be observed. The method is rapid and easy to use and is therefore suitable for checking the purity of derivatives during the preparation of chlorophylls and their derivatives.