PREPARATION OF POLY(PYROMELLITIC DIANHYDRIDE-CO-THIONIN) MODIFIED VOLTAMMETRIC SENSOR FOR THE DETERMINATION OF EPICATECHIN

Yıl 2018, Cilt: 5 Sayı: 3, 1021 - 1028, 01.09.2018

Serap Titretir Duran

https://doi.org/10.18596/jotcsa.446953

Cited By: 9

Öz

In this study, the electrochemical oxidation of epicatechin
and its voltammetric sensing is shown at a sensitive platinum electrode
modified with poly(pyromellitic dianhydride-co-thionin). The electrochemical
response of the sensor was improved in the presence of both electro-inactive
(sucrose, fructose, lactose) and electroactive (gallic acid, cafeic acid,
ascorbic acid) interferants and displayed an excellent analytical performance
for the determination of epicatechin. A linear response was obtained over a
range of epicatechin concentrations from 0.05 mM to 0.30 mM and was shown to be
useful for quantifying low levels of epicatechin in phosphate buffer solution,
PBS, pH 7.00. Regression coefficient (R2) was found to be to be 0.9969. Limit
of detection (LOD) was calculated as 1.8 × 10-5 M by using 3s/m. Where m is the
slope of the calibration curve and s is the standard deviation of the
calibration graph calculated using the Excel Steyx function.

Anahtar Kelimeler

Modified electrode, Polyimide, Sensors, Epicatechin, Voltammetry

Kaynakça

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