Platinum- polydopamine @SiO2 nanocomposite modified electrode for the electrochemical determination of quercetin

• Published in: Electrochimica acta 2015-06, Vol.168, p.16-24
• Main Authors: Manokaran, Janakiraman, Muruganantham, Rethinasabapathy, Muthukrishnaraj, Appusamy, Balasubramanian, Natesan
• Format: Article
• Language: English
• Subjects: Electrochemical determination; Platinum nanoparticles; Polydopamine; Quercetin; Silica particles
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2015.04.016

Quercetin (QR) was electrochemically determined using a platinum-polydopamine coated silica particles modified glassy carbon electrode (Pt-PDA@SiO2/GCE). Pt-PDA@SiO2 was prepared by polymerization of dopamine on SiO2 particles followed by loading of Pt nanoparticle via sodium borohydride (NaBH4) reduction method. The surface morphology of the Pt-PDA@SiO2 nanoparticles, functional groups of PDA@SiO2 and crystalline nature of the nanoparticles were characterized by FE-SEM, FTIR and XRD, respectively, The Pt-PDA@SiO2/GCE modified electrode electro active surface area and conductivity of the modified electrodes were calculated using as Fe3+/Fe2+ probe. Quercetin was quantified by Pt-PDA@SiO2/GCE modified electrode square wave voltammetry (SWV). The Pt-PDA@SiO2/GCE exhibited good electrocatalytic activity towards the electrochemical oxidation of QR with excellent reproducibility and stability. The modified electrode shows an excellent detection limit and sensitivity of 16nM (S/N=3) and 6.47μA/μM, respectively. The analytical utility of the Pt-PDA@SiO2/GCE was checked by determining the QR in various real samples such as tea, onion extract, apple juice, human urine and blood plasma.