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Inoue Y, Kim Y, Hasegawa H, Yoshida Y, Sakakibara K, Tsujii Y. A novel electrochemical biosensing method with double-layered polymer brush modified electrode. Colloids Surf B Biointerfaces 2023; 222:113105. [PMID: 36566689 DOI: 10.1016/j.colsurfb.2022.113105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 12/02/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022]
Abstract
We developed a novel electrochemical biosensor electrode that has a potential to reduce background noise for which we constructed an original conductive substrate modified with a double-layered polymer brush structure that is water impermeable and can control biomolecules adsorption/desorption. In this study, a hydrophobic poly(tert-butyl methacrylate) brush layer was prepared on a gold electrode, and then, the tert-butyl group near the outermost surface was dissociated by the acid treatment to obtain a hydrophilic carboxy group, thereby fabricating a conductive substrate with the double-layered polymer brush structure. Formation of the double-layered polymer brush structure was indicated by surface wettability and optical analyses. The potential difference and hydrogen ion concentration, which is a typical parameter of the surrounding environment, were linearly correlated with the gold electrode having a double-layered polymer brush structure with carboxyl groups. However, there was no correlation on gold electrodes with self-assembled monolayers presenting carboxy groups. It is considered that the pH responsiveness of the carboxy groups on the outermost surface could be exhibited remarkably because the charge state in the vicinity of the surface became constant due to the hydrophobic polymer brush layer having a certain thickness. The target DNA could be captured more efficiently at the probe DNA-immobilized electrode with the double-layered polymer brush structure than when using COOH-SAM. This is the first report of the application of the double-layered polymer brush structure for the electrochemical biosensing, and it will be an excellent surface modification method to reduce background noise.
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Affiliation(s)
- Yuuki Inoue
- LG Japan Lab Inc., LG Yokohama Innovation Center 7F, 1-2-13, Takashima, Nishi-ku, Yokohama-shi, Kanagawa 220-0011, Japan.
| | - Yeji Kim
- LG Japan Lab Inc., LG Yokohama Innovation Center 7F, 1-2-13, Takashima, Nishi-ku, Yokohama-shi, Kanagawa 220-0011, Japan
| | - Hijiri Hasegawa
- LG Japan Lab Inc., LG Yokohama Innovation Center 7F, 1-2-13, Takashima, Nishi-ku, Yokohama-shi, Kanagawa 220-0011, Japan
| | - Yasukazu Yoshida
- LG Japan Lab Inc., LG Yokohama Innovation Center 7F, 1-2-13, Takashima, Nishi-ku, Yokohama-shi, Kanagawa 220-0011, Japan
| | - Keita Sakakibara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Yoshinobu Tsujii
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.
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Hasegawa T, Shioya N. MAIRS: Innovation of Molecular Orientation Analysis in a Thin Film. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200139] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takeshi Hasegawa
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Nobutaka Shioya
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Nagao Y. Progress on highly proton-conductive polymer thin films with organized structure and molecularly oriented structure. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2020; 21:79-91. [PMID: 32158509 PMCID: PMC7033726 DOI: 10.1080/14686996.2020.1722740] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 01/23/2020] [Accepted: 01/24/2020] [Indexed: 05/08/2023]
Abstract
Several current topics are introduced in this review, with particular attention to highly proton-conductive polymer thin films with organized structure and molecularly oriented structure. Organized structure and molecularly oriented structure are anticipated as more promising approaches than conventional less-molecular-ordered structure to elucidate mechanisms of high proton conduction and control proton conduction. This review introduces related polymer materials and molecular design using lyotropic liquid crystals and hydrogen bond networks for high proton conduction. It also outlines the use of substrate surfaces and external fields, such as pressure and centrifugal force, for organizing structures and molecularly oriented structures.
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Affiliation(s)
- Yuki Nagao
- School of Materials Science, Japan Advanced Institute of Science and Technology, Nomi, Japan
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