Kare Dalga Adsorptif Sıyırma Voltametrisi Tekniği Kullanılarak Grafen/Katran/Kalem Grafit Sensör Elektrot ile Serotonin’in Tayini ve Elektrokimyasal Özellikleri

Abstract

Bu çalışmada Serotonin’in (5-HT) elektrokimyasal ve spektroelektrokimyasal davranışları dönüşümlü voltametri (CV) ve elektrokimyasal impedans spektroskopisi (EIS) teknikleriyle incelenmiştir. Grafen/katran/kalem grafit elektrot (GR/CTP/PGE) üzerinde 5-HT’nin CV deneyleri, 0,0 V ile 1,8 V potansiyel aralığında sulu olmayan ortamda Ag/Ag+/(10 mM AgNO3) referans elektrotu kullanılarak 20 döngü ile 100 mV s-1 tarama hızında gerçekleştirildi. Yüzey karakterizasyonları CV, EIS ve taramalı elektron mikroskobu (SEM) kullanılarak yapıldı. 5-HT’nin tayininde farklı pH değerlerinin etkisi kare dalga voltametri (SWV) tekniği ile araştırıldı. Biriktirme süresinin optimizasyonu, -0,2 ile +0,6 V potansiyel aralığında kare dalga adsorptif sıyırma voltametrisi (SWAdSV) kullanılarak belirlendi. 75 µM’den 1,0 µM’ye kadar değişen 5-HT standart çözeltileri hazırlandı ve karşılık gelen pik akımları ölçüldü. Elde edilen verilerden kalibrasyon denklemi Ip = 0,0329C5-HT + 0,1511 ve korelasyon katsayısı (R2) 0,9958 olarak hesaplandı. LOD 3,51x10-7 M ve LOQ 1,05x10-6 M olarak belirlendi.

Keywords

• Serotonin
• Dönüşümlü Voltametri
• Sensör Elektrot
• Kare Dalga Adsorptif Sıyırma Voltametrisi

Electrochemical Properties and Determination of Serotonin with Graphene/Coal Tar Pitch/Pencil Graphite Sensor Electrode using Square Wave Adsorptive Stripping Voltammetry Technique

Abstract

In the present work, electrochemical and spectroelectrochemical behaviors of Serotonin (5-HT) were studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) techniques. Cyclic voltammetric experiments of 5-HT on graphene/coal tar pitch/pencil graphite electrode (GR/CTP/PGE) were carried out between 0.0 V and 1.8 V potential range at a scan rate of 100 mV s-1 with 20 cycles in non-aqueous media. Surface characterizations were performed using CV, EIS and scanning electron microscope (SEM). Effect of different pH values was investigated by square wave voltammetry (SWV) for determination of 5-HT. Optimization of accumulation time was determined using square wave adsorptive stripping voltammetry (SWAdSV) within potential range of -0.2 to +0.6 V. 5-HT standard solutions changing from 75 µM to 1.0 µM were prepared and the corresponding peak currents were measured. From the obtained data calibration equation was derived Ip = 0.0329C5-HT + 0.1511 with correlation coefficient (R2) 0.9958. LOD was 3.51x10-7 M and LOQ was 1.05x10-6 M.

Keywords

• Serotonin
• Cyclic Voltammetry
• Sensor Electrode
• Square Wave Adsorptive Stripping Voltammetry

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