Original scientific paper
https://doi.org/10.5599/jese.2262
Comparative voltammetric determination of ascorbic acid at three different carbon electrodes: application of carbon screen-printed electrode for citrus fruits analysis
Talytha Rodrigues Gaspari Paina
; Grupo de Eletroquímica, Eletroanalítica e Química Forense (GEEQFor), Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Brazil
Izabel Cristina Eleotério
; Grupo de Eletroquímica, Eletroanalítica e Química Forense (GEEQFor), Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Brazil
Nelson Ramos Stradiotto
; Instituto de Química, Universidade Estadual Paulista (IQ-UNESP). Av. Prof. Francisco Degni, 55 - Jardim Quitandinha, Araraquara, SP, CEP 14800-900, Brazil
Marcelo Firmino de Oliveira
; Grupo de Eletroquímica, Eletroanalítica e Química Forense (GEEQFor), Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Brazil
Abstract
Determining the vitamin C (ascorbic acid) content in citrus fruits is crucial for dietary and nutritional considerations. Traditional analytical methods for ascorbic acid analysis often involve expensive and less portable electrodes, limiting their practicality in food analysis. This study focuses on the quantification of ascorbic acid in citrus fruits using a cost-effective and portable carbon screen-printed electrode. The efficiency of these electrodes was assessed using cyclic voltammetry and linear sweep voltammetry due to the irreversible oxidation behavior of ascorbic acid. A comparative analysis was performed with glassy carbon, carbon paste, and commercial carbon screen-printed electrodes, focusing on sensi¬tivity variations based on analyte concentration and scanning rate. The carbon screen-printed electrode demonstrated superior sensitivity to the other electrodes tested, establishing it as a practical alternative for ascorbic acid analysis in citrus fruits. This study employed the standard addition method in conjunction with linear sweep voltam¬metry to accurately determine ascorbic acid concentrations in pear-orange, Tahiti lemon, and Ponkan tangerine samples. The obtained values were cross-referenced with existing literature data, enhancing our understanding of vitamin C content in these citrus fruits. Overall, this research highlights the potential of the carbon screen-printed electrode as a valuable tool for vitamin C analysis, offering new insights into food science and nutrition.
Keywords
Vitamin C; carbon electrodes; voltammetry techniques; standard addition method; juice samples
Hrčak ID:
328939
URI
Publication date:
3.3.2025.
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