アラカワ　タカヒロ   荒川　貴博    所属   工学部 電気電子工学科    職種   准教授
言語種別	英語
発行・発表の年月	2022/10
形態種別	学術論文
査読	査読あり
標題	Surface plasmon-enhanced fluorescence immunosensor for monitoring cardiac troponin I
執筆形態	共著
掲載誌名	Sensors and Actuators B: Chemical
掲載区分	国外
出版社・発行元	Elsevier
巻・号・頁	132132
総ページ数	8
著者・共著者	Toma K, Oishi K, Iitani K, Arakawa T, Mitsubayashi K
概要	erioperative myocardial infarction (PMI) is a common complication of non-cardiac surgery and monitoring a PMI marker, cardiac troponin I (cTnI), is helpful for the early detection of PMI. However, there is no existing biosensor for continuous measurement of cTnI. Addressing this challenge, we developed a surface plasmon-enhanced fluorescence (SPF) immunosensor for the semi-continuous measurement of cTnI. The sensor system relied on attenuated total reflection with Kretschmann configuration at the wavelength of 633 nm. An Au substrate was modified with a robust scaffold protein fused with protein G that enabled immobilization and repeated use of a capture antibody. The cTnI was measured by a sandwich assay with a fluoresce-labeled detection antibody. We also fabricated a light pipe flow-cell to collect the fluorescence efficiently. As a result, the dynamic range of the SPF immunosensor to cTnI was 3.9–100 ng/mL, and the LOD was 0.98 ng/mL. The sensor showed output only from samples containing cTnI, indicating the high selectivity. The sensor surface was regenerated by glycine-HCl (pH 2) solution, and the high reproducibility of the output (C.V. = 1.8%) was obtained in five repeated measurements of cTnI. These results indicated the potential of the SPF immunosensor for cTnI monitoring.
DOI	https://doi.org/10.1016/j.snb.2022.132132
researchmap用URL	https://doi.org/10.1016/j.snb.2022.132132
外部リンクURL	https://doi.org/10.1016/j.snb.2022.132132