Low Cost, Sensitive and Selective Chronoamperometric Determination of Vanillin at a Disposable Poly(Eriochrome Black T)/Pencil Graphite Electrode

Yıl 2020, Cilt: 18 Sayı: 1, 1 - 11, 30.04.2020

Serkan Karakaya

https://doi.org/10.24323/akademik-gida.729976

Cited By: 3

Öz

In this study, low cost, sensitive and selective chronoamperometric determination of vanillin (VNL) is firstly achieved by using a disposable poly(Eriochrome Black T) modified pencil graphite electrode (poly(EBT)/PGE). Electro-oxidation behavior of 1.0 mM VNL was investigated at both poly(EBT)/PGE and PGE by the cyclic voltammetry (CV) method. CV measurements showed that oxidation current of VNL at poly (EBT)/PGE was much higher than the bare one. Furthermore, the pH effect on electro-oxidation current of VNL was tested at different pH values (2.0-8.0) of Britton Robinson Buffer solution (BRBS) for poly(EBT)/PGE and the highest current was obtained at pH 7.0 BRBS. Significant analytical parameters such as linear response range (LRR), limit of detection (LOD), and sensitivity were found as 0.050-10.0 µM, 0.013 µM and 5355 µA mM-1 cm-2, respectively. The fabricated sensor was tested on a VNL-containing sample (VNL content: 3.0%) and the result (3.04% ±0.01) obtained from the applicability study showed that the proposed sensor enables the determination of VNL with high accuracy and precision.

Anahtar Kelimeler

Vanillin, Pencil graphite electrode, Chronoamperometry, Cyclic voltammetry, Electrochemical sensor

Tek Kullanımlık Poli(Eriokrom Siyahı T) Modifiye Kalem Grafit Elektrotta Vanilinin Düşük Maliyetli, Seçici ve Duyarlı Kronoamperometrik Tayini

Öz

Bu çalışmada, vanilinin (VNL) düşük maliyetli, duyarlı ve seçici kronoamperometrik tayini tek kullanımlık bir poli(Eriokrom Siyahı T) modifiye kalem grafit elektrodun (poly(EBT)/PGE) kullanılması ile ilk defa gerçekleştirilmiştir. 1.0 mM VNL’nin elektro-yükseltgenme davranışı, hem PGE’de hem de poly(EBT)/PGE’de döngüsel voltammetri (CV) metodu ile incelenmiştir. CV ölçümleri poly(EBT)/PGE’deki yükseltgenme akımının yalın elektroda göre daha yüksek olduğunu göstermiştir. Ayrıca, poly(EBT)/PGE’de VNL’nin yükseltgenme akımına pH’nın etkisi, farklı pH değerlerindeki (2.0-8.0) Britton Robinson tampon çözeltilerinde (BRBS) test edilmiş ve en yüksek akımın pH 7.0 BRBS’de alındığı gözlenmiştir. Doğrusal yanıt aralığı (LRR), belirtme alt sınırı (LOD) ve duyarlılık gibi önemli analitiksel parametreler sırasıyla 0.050-10.0 µM, 0.013 µM ve 5355 µA mM-1 cm-2 olarak bulunmuştur. Tasarlanan sensör, VNL içeren bir örnekte (VNL içeriği %3.0) başarıyla test edilmiş ve uygulanabilirlik çalışmasından elde edilen sonuç (%3.04 ±0.01), önerilen sensörün, VNL’nin yüksek doğrulukta ve kesinlikte tayinine imkân sağladığını göstermiştir.

Anahtar Kelimeler

Vanilin, Kalem grafit elektrot, Kronoamperometri, Döngüsel voltammetri, Elektrokimyasal sensör

Kaynakça

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