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Protein functionalised self assembled monolayer based biosensor for colon cancer detection.
Narayan, Tarun; Kumar, Saurabh; Kumar, Suveen; Augustine, Shine; Yadav, B K; Malhotra, Bansi D.
Afiliação
  • Narayan T; Nanobioelectronics Laboratory, Department of Biotechnology, Delhi Technological University, Delhi, 110042, India.
  • Kumar S; Nanobioelectronics Laboratory, Department of Biotechnology, Delhi Technological University, Delhi, 110042, India; Centre for Nano Science and Engineering (CeNSE), Indian Institute of Science, Bengaluru, 560012, India.
  • Kumar S; Nanobioelectronics Laboratory, Department of Biotechnology, Delhi Technological University, Delhi, 110042, India; Department of Chemistry, University of Delhi, Delhi, 110007, India.
  • Augustine S; Nanobioelectronics Laboratory, Department of Biotechnology, Delhi Technological University, Delhi, 110042, India.
  • Yadav BK; Rajiv Gandhi Cancer Institute and Research Centre, Delhi, 110085, India; National Liver Disease Biobank, Institute of Liver and Biliary Sciences, Delhi, 110070 India.
  • Malhotra BD; Nanobioelectronics Laboratory, Department of Biotechnology, Delhi Technological University, Delhi, 110042, India. Electronic address: bansi.malhotra@gmail.com.
Talanta ; 201: 465-473, 2019 Aug 15.
Article em En | MEDLINE | ID: mdl-31122452
We report results of the studies relating to the fabrication of a surface plasmon resonance (SPR) based label-free immunosensor for real-time monitoring of endothelin-1 (ET-1), a colon cancer biomarker. A gold disk modified with a self-assembled monolayer (SAM) of 11-mercaptoundecanoic acid (11-MUA) was functionalised via covalent immobilization of monoclonal anti-ET-1 antibodies using EDC-NHS (1-(3-(dimethylamine)-propyl)-3-ethylcarbodiimide hydrochloride, N-hydroxy succinimide) chemistry. This immunosensing platform (ethanolamine/anti-ET-1/11-MUA/Au) was characterized via atomic force microscopy (AFM), contact angle (CA) and Fourier transform infrared (FT-IR) spectroscopic techniques. The fabricated SPR electrode was further used to detect ET-1 in the broad concentration range 2-100 pg mL-1, with a detection limit of 0.30 pg mL-1 and remarkable sensitivity of 2.18 mo pg-1mL. The adsorption mechanism was studied using monophasic model and the values of association (ka) and dissociation (kd) constants for anti-ET-1 and ET-1 binding were calculated to be 4.4 ±â€¯0.4 × 105 M-1 s-1 and 2.04 ±â€¯0.0003 × 10-3 s-1, respectively. The results obtained via analysis of serum samples of colorectal cancer patients were found to be in good agreement with those obtained from enzyme-linked immunosorbent assay (ELISA) technique. Further, electrochemical studies were performed to prove the efficacy of the fabricated platform as a point of care device for the detection of ET-1.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Técnicas Biossensoriais / Neoplasias do Colo / Endotelina-1 / Ressonância de Plasmônio de Superfície / Técnicas Eletroquímicas Idioma: En Ano de publicação: 2019 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Técnicas Biossensoriais / Neoplasias do Colo / Endotelina-1 / Ressonância de Plasmônio de Superfície / Técnicas Eletroquímicas Idioma: En Ano de publicação: 2019 Tipo de documento: Article