Liquid-phase binding assay of α-fetoprotein using DNA-coupled antibody and capillary chip electrophoresis

被引：41

作者：

Kawabata, T ^{[1
]}

Watanabe, M ^{[1
]}

Nakamura, K ^{[1
]}

Satomura, S ^{[1
]}

机构：

[1] Wako Pure Chem Ind Ltd, New Diagnost Business & Technol Dev Dept, Osaka, Japan

来源：

ANALYTICAL CHEMISTRY | 2005年 / 77卷 / 17期

关键词：

D O I：

10.1021/ac050458p

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

An immunoassay using DNA-coupled antibody for bound/free separation in a liquid-phase binding assay format is described. Anti-alpha-fetoprotein monoclonal antibody was conjugated with DNA, mixed with alpha-fetoprotein (AFP), and incubated, and then 1 mu L of the mixture was applied to capillary electrophoresis on a microchip. The DNA molecule of the antibody-DNA conjugate and the DNA-conjugated immune complex peak were detectable fluorophotometrically using intercalator dye within 90 s, whereas the Alexa-labeled antibody was detected as a broad and slower migrating peak. The electrophoretic mobility of the immune complex could be optimized for resolution and sharpness by changing the length of the DNA coupled to the antibody. The detection limit of AFP was similar to 300 pM in a sample. This immunoassay method utilizing a liquid-phase binding assay format is simple and convenient for antigen measurements on microchips.

引用

页码：5579 / 5582

页数：4

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