Silver Loaded Aluminosilicate as a Stationary Phase for the Liquid Chromatographic Separation of Unsaturated Compounds

Abstract

Microparticulate silica gel was treated with sodium aluminate to give a polyanionic surface which could readily exchange its counter ions for silver ions. The Ag-support is highly selective for unsaturated geometric isomers. The system was successfully applied to separate isomers of permethrin—a new synthetic pyrethroid pesticide, and series of isomers of C₁₈ and C₁₆ fatty acids. It gave short analysis time and good separations. Silver complexation was evident in the Ag-support in comparison with plain silica gel and sodium aluminosilicate. The new column did not suffer from Ag bleeding problems associated with some earlier works.