Analysis of Three Reactive Dyes and Their Six Derivatives by Capillary Electrophoresis

Abstract

Reactive dyes with different reactive groups exhibit different hydrolysis and dyeing behaviors. This is particularly evident in the combination dyeing process, where the competion between hydrolysis and dyeing reactions increases the complexity. Therefore, developing an effective method to monitor the changes in reactive dyes during the dyeing process is important. This study aims to develop a capillary electrophoresis(CE) technique combined with an ultraviolet(UV) detector(CE-UV) for detecting three reactive dyes and their six derivatives(a total of nine analytes). The optimized CE conditions are 20.0 mmol/L sodium tetraborate(Na_2B_4O₇·10H_2O), acetonitrile(ACN) with a volume fraction of 15.0%, 20.0 mmol/L α-cyclodextrin(α-CD), and at a pH value of 9.0(adjusted with 0.5 mol/L H_3BO₃). The limit of detection(LOD)(a signal-to-noise ratio of 3) for the nine analytes ranges from 1.38 to 5.06 mg/L. The relative standard deviations(RSDs) for peak areas and migration time are 2.19%-4.96% and 0.29%-2.75%, respectively. The method is capable of accurately identifying three reactive dyes and their six derivatives and monitoring alterations in composition and dyeing behavior during single and combination dyeing processes.

Keywords

reactive dye / capillary electrophoresis(CE) / hydrolyzed product / combination dyeing

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Funding

Research Foundation from National Innovation Center of Advanced Dyeing & Finishing Technology, China(2022GCJJ15)