Facile Synthesis of Mn₂O₃ for Highly Active Catalytic Oxidation and Reduction of Organic Substances and Electrochemical Determination of L-Methionine

摘要

This paper reports the electrochemical determination of L-Methionine (L-Met) in phosphate buffersolution (pH = 7.0) utilizing the Mn2O3 on screen-printed carbon electrode (Mn2O3/SPCE) and Mn2O3catalyst display excellent activity for catalytic reduction of p-Nitrophenol. Initially, as-prepared Mn2O3were characterized by various analytical methods. From the electrochemical studies bare SPCEshowed an ill-defined oxidation peak around 1.214 (?0.02) V for L-Met whereas Mn2O3/SPCE showeda well-defined oxidation peak at 1.173 (?0.02) V. Under optimum conditions, the Mn2O3/SPCEshowed a linear range of L-Met concentrations of 1.0 x 10-6 to 6.1 x 10-4 M. The limit of detection isabout 1.0 x 10-9 M (S/N = 3). The presently modified working electrode has also been effectivelyapplied for the determination of L-Met in real sea food samples. The Mn2O3 signifies user-friendly,strong and high sensitive with real applications for electrochemical determination of amino acids aswell as catalytic reduction of p-Nitrophenol.