Dihidroksibenzen Türevlerinin MWCNT Bağlanması ve Elektrokimyasal NADH Oksidasyonu

3,4 ve 2,5-dihidroksibenzen bileşikleri, Boc (tert-bütiloksikarbonil) koruyucu grubunu taşıyan benzilaminin diazonyum bileşiğinin elektrokimyasal indirgenmesi yoluyla camsı karbon elektrotun (GC) yüzeyinde biriktirilen çok duvarlı karbon nanotüpe (MWCNT) ayrı ayrı ve kovalent olarak bağlanmıştır. Boc grubunun çıkarılmasının ardından, amin uçlu yüzey ile dihidroksibenzen türevlerinin açil grubu arasında bir amit bağı oluşturulmuştur. Dihidroksibenzen ile modifiye edilmiş MWCNT'nin elektrokimyasal özellikleri ve tarama hızının voltamogram üzerindeki etkisi dönüşümlü voltametri (CV) ile aydınlatılmıştır. Dihidroksibenzen türevleri tarafından modifiye edilmiş MWCNT'nin elektron transfer kinetiği de Laviron teorisi kullanılarak incelenmiştir. Modifiye edilmemiş MWCNT ile karşılaştırıldığında anodik pik akımındaki artış ve NADH oksidasyonunun aşırı-potansiyelindeki negatif kayma ile kanıtlandığı gibi, 3,4 ve 2,5-dihidroksibenzen ile modifiye edilmiş MWCNT elektrotlarının NADH oksidasyonuna karşı katalitik aktiviteye sahip olduğu gösterilmiştir.

Anahtar Kelimeler:

MWCNT, NADH, Sensör, Elektrot Modifikasyonu

The Coupling of Dihydroxybenzene Derivatives to MWCNT and Electrochemical NADH Oxidation

3,4 and 2,5- dihydroxybenzene compounds were separately and covalently coupled to the multiwalled carbon nanotube (MWCNT) deposited on the surface of glassy carbon electrode through electrochemical reduction of diazonium compound of benzylamine bearing Boc protecting group (tert-butyloxycarbonyl). Following the removal of the Boc group, an amide bond was formed between the amine-terminated surface and the acyl group of the dihydroxybenzene derivatives. The electrochemical properties of dihydroxybenzene-modified MWCNT and the influence of the sweep rate on the voltammogram were elucidated by cyclic voltammetry (CV). Electron transfer kinetics of modified MWCNT by dihydroxybenzene derivatives was also studied using Laviron’s theory. As evidenced by an improvement in the anodic peak current and a negative shift in the overpotential of NADH oxidation when compared to the bare MWCNT, 3,4 and 2,5- dihydroxybenzene modified MWCNT electrodes were shown to possess catalytic activity toward NADH oxidation.

Keywords:

MWCNT, NADH, Sensor, Electrode Modification,

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