A chromatographic method for determining the carboxyl groups in filter paper was developed. Experiments were carried out with several kinds of metal ions, making use of the strong bond of different metal ions to the carboxyl groups of the paper. Lead(II) ions gave the most satisfactory results. The influence of ester and lactone groups on the carboxyl group determinations was studied. The method is rapid and reliable.
It is very useful to employ ion‐exchanging chromatography papers for a rapid separation of a mixture of amino acids. Various separations are described, in some cases taking only one hour. Special papers were developed for this purpose based on chemical modification of cellulose and containing basic or acid groups. The possibilities for using these papers in a quantitative determination are discussed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.