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A Comparative Study of Diamine-Modified and Amine-Modified Silica Nanoparticles as Pseudo-Stationary Phases for CE Separation

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Abstract

The use of silica nanoparticles with surface modification in different applications is a topic of growing interest. This article provides a systematic comparison of diamine-modified and amine-modified silica nanoparticles as pseudo-stationary phases (PSPs) in capillary electrophoresis. The different electrophoretic behavior of these PSPs was evaluated by analysis of four auxins, indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), 2,4-dichlorophenoxyacetic acid (dCPAA), and 2-(1-naphthyl)acetic acid (NAA). As expected, fast separation of the auxins was achieved, because they migrate in the same direction as the electro-osmotic flow under the optimum experimental conditions. However, the two nanoparticles had different selectivity and efficiency in the separation of the auxins, which could be related to the primary and secondary amines in their structures. The results indicated that even slight structural changes of the functional groups of the nanoparticles have pronounced effect on the interactions between the pseudo-stationary phase and the analytes.

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Acknowledgments

This work is supported by the Key Laboratory Project of Department of Education of Liaoning Province (no. 2009s004).

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Authors and Affiliations

  1. College of Biotech and Food Science, Bohai University, Jinzhou, 121013, China

    Li-Juan Hui & Yong Ma

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  1. Li-Juan Hui
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  2. Yong Ma
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Correspondence to Yong Ma.

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Hui, LJ., Ma, Y. A Comparative Study of Diamine-Modified and Amine-Modified Silica Nanoparticles as Pseudo-Stationary Phases for CE Separation. Chromatographia 73, 507–515 (2011). https://doi.org/10.1007/s10337-010-1904-3

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  • DOI: https://doi.org/10.1007/s10337-010-1904-3

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