Theoretical and electrochemical analysis of L-serine modified graphite paste electrode for dopamine sensing applications in real samples

Original scientific paper


  • Revanappa Santhosh Kumar Department of Chemistry, University B.D.T. College of Engineering, Visvesvaraya Technological University, Davangere - 577004, Karnataka, India
  • Gururaj Kudur Jayaprakash Laboratory of Quantum Electrochemistry, School of Advanced Chemical Sciences, Shoolini University, Bajhol, Himachal Pradesh, 173229, India and Department of Chemistry, Nitte Meenakshi Institute of Technology, Bangalore, Karnataka, 560064, India
  • Siddalinganahalli Manjappa Department of Chemistry, University B.D.T. College of Engineering, Visvesvaraya Technological University, Davangere - 577004, Karnataka, India
  • Mohan Kumar Department of Chemistry, PES Institute of Technology and Management, Sagar Road, Guddada Arakere, Kotegangoor, 577204, Shivamogga, India
  • Avvaru Praveen Kumar Department of Applied Chemistry, School of Applied Natural Science, Adama Science and Technology University, P O Box 1888, Adama, Ethiopia



Amino acid, redox reaction, quantum chemical modelling, voltammetry, sensor, dopamine


In this study, the carbon paste electrode (CPE) was modified by grinding L-serine in a pestle and mortar. L-serine (L-s) was shown to be an effective electrocatalyst at the modified CPE (MCPE) interface for detecting dopamine (DA). L-sMCPE showed excellent activity to detect DA in commercial injection samples with a recovery range of 98.9 to 100.5 %. Theoretical studies were used to understand the electrocatalysis of L-serine at the atomic level using frontier molecular orbitals (FMO) and analytical Fukui assay. According to theoretical findings, the amine group of L-serine works as an extra oxidation site (reason for enhanced reduction peak DA) and the carboxylic acid group acts as an additional reduction site (reason for enhanced oxidation peak DA) at the L-sMCPE interface.


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Electrochemical Science