ESTUDIO COMPARATIVO DE LOS MÉTODOS ESPECTROFOTÓMETRICO Y POTENCIOMÉTRICO PARA LA DETERMINACIÓN CUANTITATIVA DE FENOLES TOTALES EN PLANTAS MEDICINALES ECUATORIANAS

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Anyi Jaramillo Jiménez
Carmita Jaramillo Jaramillo
Luisa Rojas de Astudillo
https://orcid.org/0000-0001-6667-1673

Resumen

En este estudio, fueron comparados los valores de las concentraciones de fenoles totales en extractos acuosos de plantas medicinales ecuatorianas que fueron obtenidos usando el método espectrofotométrico desarrollado por Folinn y Ciocalteau y por titulación potenciométrica. Por el método potenciométrico se cuantificaron los fenoles totales presentes en cuatro plantas medicinales (Ageratum conyzoides, Cnidoscolus chayamansa, Cynara scolymus y Taraxacum officinale), las cuales fueron seleccionadas por ser representativas de los contenidos alto, medio, intermedio y bajo de fenoles totales de las doce plantas previamente analizadas espectrofotométricamente. Los resultados de la cuantificación de fenoles totales por titulación potenciométrica tuvieron una alta correlación (R2=0,987) con los valores obtenidos por el método espectrofotométrico, a las concentraciones de 0,70 a 24,0 mg/g. El uso de la potenciometría para cuantificar fenoles totales resultó amigable con el ambiente al utilizar concentraciones muy diluidas de reactivos y reemplazar las substancias tóxicas empleadas habitualmente en los métodos espectrofotométricos.

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