Rétention d'Acides Amines sur Silice Chargée en Cuivre

Abstract

The functionalization of silica with «bis(dithiocarbamate)-tentacles» and the retention of transition metal ions on this chelating surface were studied. The chemically modified silica in a copper(II)-loaded state has been used as an analogue for formulating a hypothesis concerning retention mechanisms for amino acids in heterogeneous aqueous media. It is proposed that a chelate complex causes the observed strong binding of amino acids to the silica surface. This behaviour enables the surface to be employed for enrichment of such compounds from environmental samples. In addition, the modified silica was found suitable for the enrichment of Lewis bases and on-line coupling to a chromatographic column.