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Simple and Rapid Immobilization of Coating Polymers on Poly(dimethyl siloxane)-glass Hybrid Microchips by a Vacuum-drying Method

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Abstract

A simple and rapid vacuum-drying modification method was applied to several neutral and charged polymers to obtain coating layers for controlling electroosmotic flow (EOF) and suppressing sample adsorption on poly(dimethyl siloxane) (PDMS)-glass hybrid microchips. In the vacuum-dried poly(vinylpyrrolidone) coating, the electroosmotic mobility (μeo) was suppressed from +2.1 to +0.88 × 10−4 cm2/V•s, and the relative standard deviation (RSD) of μeo was improved from 10.2 to 2.5% relative to the bare microchannel. Among several neutral polymers, poly(vinylalcohol) (PVA) and poly(dimethylacrylamide) coatings gave more suppressed and repeatable EOF with RSDs of less than 2.3%. The vacuum-drying method was also applicable to polyanions and polycations to provide accelerated and inversed EOF, respectively, with acceptable RSDs of less than 4.9%. In the microchip electrophoresis (MCE) analysis of bovine serum albumin (BSA) in the vacuum-dried and thermally-treated PVA coating channel, an almost symmetric peak of BSA was obtained, while in the native microchannel a significantly skewed peak was observed. The results demonstrated that the vacuum-dried polymer coatings were effective to control the EOF, and reduced the surface adsorption of proteins in MCE.

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Authors and Affiliations

  1. Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, 036-8561, Hirosaki, Aomori, Japan

    Fumihiko Kitagawa, Syo Nakagawara & Isoshi Nukatsuka

  2. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, 615-8510, Katsura, Nishikyo, Kyoto, Japan

    Yusuke Hori & Koji Otsuka

  3. Department of Applied Chemistry, Osaka Prefecture University Graduate School of Engineering, 1-1 Gakuen-cho, 599-8531, Naka, Sakai, Japan

    Kenji Sueyoshi

Authors
  1. Fumihiko Kitagawa
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  2. Syo Nakagawara
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  3. Isoshi Nukatsuka
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  4. Yusuke Hori
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  5. Kenji Sueyoshi
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  6. Koji Otsuka
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Correspondence to Fumihiko Kitagawa.

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Kitagawa, F., Nakagawara, S., Nukatsuka, I. et al. Simple and Rapid Immobilization of Coating Polymers on Poly(dimethyl siloxane)-glass Hybrid Microchips by a Vacuum-drying Method. ANAL. SCI. 31, 1171–1175 (2015). https://doi.org/10.2116/analsci.31.1171

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  • DOI: https://doi.org/10.2116/analsci.31.1171

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