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    • Graduate School - MU Theses and Dissertations (MU)
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    • 2009 Dissertations (MU)
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    Core-based hyperbranched polyethyleneimine coating in capillary electrophoresis

    Boonyakong, Cheerapa, 1972-
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    Date
    2009
    Format
    Thesis
    Metadata
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    Abstract
    In capillary electrophoresis (CE), chemical and dynamic modification of a fused silica surface can be used to control the electroosmotic flow (EOF), to minimize the interaction of analytes with the capillary surface and to modify the selectivity. , core-based hyperbranched polyethyleneimine (CHPEI) polymer utilized as either a static or dynamic coating in this study. A CHPEI-coated capillary was simply constructed in a rinsing fashion or by adding a small amount of CHPEI in a running buffer. In CHPEI-coated capillaries, several parameters were studied as follows: (1) EOF as a function of buffer pH; (2) effect of coating media (NaCl solution) concentration; (3) effect of buffer concentration; and (4) stability and reproducibility of the coating. Since CHPEI25-coated capillary provides greater EOF stability, CHPEI25 was chosen for further studies. The performance of CHPEI25 dynamic-, static-, and hybrid-coated capillaries was investigated in the separations of phenols, basic amino acids, B vitamins, aniline and its derivatives. The separation performance of CHPEI25 dynamic-coated capillaries were also compared to that of commercial eCAPTM capillary from Beckman Coulter. It is evident that CHPEI25 dynamic-coated capillary provides significantly improved peak resolution under identical separation conditions compared to that in eCAPTM.
    URI
    https://hdl.handle.net/10355/6145
    https://doi.org/10.32469/10355/6145
    Degree
    Ph. D.
    Thesis Department
    Chemistry (MU)
    Rights
    OpenAccess.
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
    Collections
    • Chemistry electronic theses and dissertations (MU)
    • 2009 MU dissertations - Freely available online

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