Modular and conservative procedure for the quantification of amino functionalities bonded to solid porous matrices.

In this study an original and operationally simple procedure designed to quantify the density of basic groups (typically amino groups) chemically bonded to the surface of porous solids, which also allows a full recovery of the analysed material, is presented. The method is based on the preventive acid-base reaction of the basic groups linked to the solid by 3,5-dinitrobenzoic acid (DNBA). The quantification of the basic functionalities is then performed by an UV-spectrophotometric retro-titration of the thus salified solid matrix (or, alternatively, by HPLC approach), resorting to a preventive either acid or basic displacement of DNBA from the matrix. The uncertainty of the density measurements is assessed by 13%.
PMID: 31072473 [PubMed]

Source: Analytica Chimica Acta - May 11, 2019 Category: Chemistry Authors: Manzi G, Buonsenso F, Ismail OH, Ciogli A, Siani G, Pierini M Tags: Anal Chim Acta Source Type: research