Electrochemical Quantification of Erythrosine Using Poly-L-Glutamic Acid Decorated Pencil Graphite Electrode

The widespread utilization of food colorants, coupled with their potential toxicity, has increased substantial health concerns in the contemporary world. In response to this issue, we have developed an effective and easy method for quantifying erythrosine by utilizing voltammetric analysis and modifying the surface of the pencil graphite electrode (PGE) with a biopolymer of L-glutamic acid (GA). This sensor is a selective and sensitive analysis of the food additive, erythrosine, by employing an inexpensive electroanalytical technique. We successfully developed a PGE modified with L-GA as the sensing material for the determination of erythrosine by utilizing the differential pulse voltammetric method. The simplicity of the electrode with a high sensitivity of 12.36 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>A/<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>M/cm2 and a linear range of 0.5–6 and 10–60 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>M for erythrosine detection results in a lower detection value of 0.003 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>M and limit of quantification value as 0.01 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu $ </tex-math></inline-formula>M.