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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received March 1, 2019
Accepted April 27, 2019
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Screening of the antioxidant properties of olive (Olea europaea) leaf extract by titanium based reduced graphene oxide electrode

Engineering Faculty, Department of Chemistry, Istanbul University-Cerrahpasa, 34320 Avcilar, Istanbul, Turkey 1Engineering Faculty, Department of Chemical Engineering, Istanbul University-Cerrahpasa, 34320 Avcilar, Istanbul, Turkey
selins@istanbul.edu.tr
Korean Journal of Chemical Engineering, July 2019, 36(7), 1184-1192(9), 10.1007/s11814-019-0288-9
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Abstract

Olive leaves were extracted with homogenizer-assisted extraction (HAE). Box-Behnken (BBN) design was employed through response surface approach (RSA) to achieve the optimum conditions. Bioactivity of the extract was assessed by its oleuropein, total biophenol (TBC) and total flavonoid (TFC) content along with its antioxidant activity determined by DPPH and CUPRAC assays. A new nanocomposite was developed using reduced graphene oxide (rGO) modified with TiOx (Ti-rGO) for trace amount determination of oleuropein in olive leaf extract. Structural characterization of the electrode was clarified using atomic force microscopy (AFM) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) techniques. Cyclic voltammetry (CV) and square wave voltammetry (SWV) techniques were performed to investigate electrochemical behavior of oleuropein using three electrode configurations. Results of CV and SWV showed that quasi-reversible reaction occurred on electrode/electrolyte interface and a linear concentration range of 5-30 nM was obtained with a detection limit of 0.57 nM for oleuropein.

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