Use of Furan Derivatives in Paper Chromatography

THE separation of mixtures of amino-acids into discrete spots on paper chromatograms has hitherto almost invariably been carried out using solvents only partially miscible with water. However, in work concerned with the separation of certain peptides we found that the usual solvents (namely, butanol, benzyl alcohol, phenol, collidine) were inadequate, and in consequence sought alternative solvents.