Analysis of roller pen inks by capillary zone electrophoresis

Abstract

The analysis of roller pen inks has become more and more important in fraudulent document examination because of the extensive use of roller pens in financial documents. Capillary electrophoresis with powerful resolution was applied for the analysis of roller pen inks. The experiment focused on the optimization of the separation of the extract from commercially available roller pen entries. A better separation electropherogram was obtained when a 20 mM borate buffer at pH 8.5 and a fused silica capillary with an inner diameter of 100 µm with a total length of 47 (40 cm to the detector window) were used. Five inks from roller pens of different manufacturers and countries were analyzed, and their electropherograms showed that most patterns are distinctly different from each other. Capillary with inner diameter of 100 µm increased the intensity of determination; therefore, color dyes were identified in the visible range and were able to provide more information for comparing types of roller pen inks.