Résumé : The direct coupling of high-speed counter-current chromatography to thin-layer chromatography is proposed as an efficient method for the on-line monitoring of the column effluent. It requires a simple adaptation of the fittings of a Linomat C device without modification of the software. An application to the separation of asiaticoside aned madecassoside from a crude extract of Centella asiatica is presented.