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Updated: Jul 18, 2026
Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer (SALB) Method
Published on: December 1, 2015
Poly-(3-hexylthiophene) self-assembled monolayer based cholesterol biosensor using surface plasmon resonance
Sunil K Arya1, Pratima R Solanki, S P Singh
1Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi, India.
Abstract:
Cholesterol oxidase (ChOx) has been covalently immobilized onto 1-fluoro-2-nitro-4-azidobenzene (FNAB) modified poly-(3-hexylthiophene) (P3HT) self-assembled monolayer (SAM) onto gold coated glass plates. These ChOx/FNAB/P3HT/Au bio-electrodes have been characterized using contact angle (CA) measurements, UV-vis spectroscopy, electrochemical impedance technique, cyclic voltammetric technique and atomic force microscopic (AFM) technique, respectively. The ChOx/FNAB/P3HT/Au bio-electrodes were utilized for the estimation of cholesterol concentration in standard solutions using surface plasmon resonance (SPR) technique. It is shown that this SPR biosensor has linearity from 50 to 500 mg/dl of cholesterol in solution with detection limit of 50 mg/dl, sensitivity of 1.0 4 m degrees /(mg dl), reusability of around 15 times and a shelf-life of about 10 weeks when stored at 4 degrees C.
