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The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 25
(2020) pp 42-44
Electrochemically Lignin Modified Electrode to Detect Ascorbic acid, Paracetamol, and Caffeine Simultaneously by Differential Pulse-Anodic Stripping Voltammetry (DP-ASV)
Kai Murana, Marlee Richardson and Suzanne Lunsford*
Wright State University, Department of Chemistry, 3640 Colonel Glenn Highway, Ohio 45435, suzanne.lunsford@wright.edu
Received October 29, 2019. Accepted February 19, 2020.
Published: 3 March 2020
Abstract. The
following article describes an inquiry-based learning experience for our
chemical education majors which stimulated interest in electrochemistry
development by creating a sensor to detect pharmaceuticals (paracetamol),
Vitamin C (ascorbic acid) and common drug caffeine. An electrochemically
modified bare carbon electrodes with lignin without the need of prior
separation for a mixture of paracetamol, ascorbic acid and caffeine were
analyzed by electrochemical techniques. Differential pulse voltammetry (DPV)
and differential pulse anodic stripping voltammetry (DP-ASV) was utilized to
study the electrochemical affinity of bare electrodes (carbon, gold and
platinum) versus modified lignin electrodes towards ascorbic acid, paracetamol
and caffeine. The simultaneous detection of ascorbic acid, paracetamol and
caffeine without the need of prior separation utilizing the lignin modified
electrode by means of DP-ASV method was successful without common interference
issues.
Key Words: Laboratories and Demonstrations; analytical chemistry; differential pulse voltammetry (DPV); differential pulse anodic stripping Voltammetry (DP-ASV); modified lignin electrode; paracetamol; ascorbic acid; and caffeine
(*) Corresponding author. (E-mail: suzanne.lunsford@wright.edu)
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