Session

Pharmaceutical and Natural Sciences

Description

In this work, the influence of graphene nanoribbons (GNs), graphene nanoplatelets (GNPls), multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO) as a modifier on the properties of screen-printed carbon electrodes towards electrochemical determination of riboflavin (VB2) is investigated. Additionally, ionic liquid (IL, 1-Butyl-2,3-dimethylimidazolium tetra fluoroborate), iron(II) phthalocyanine (FePc) and Nafion were added into the modifier suspensions and further tested for their electro-catalytic effect. Their performance as modifier is compared to unmodified screen-printed carbon electrodes (SPCE). Unmodified screen-printed electrodes are printed in laboratory onto the ceramic substrate using carbon ink. Modified electrodes are prepared by drop-casting modifier suspension onto the active surface area of SPCE. The three-electrode system is used, consisted of a glass vessel equipped with the screen-printed carbon electrode as a working electrode (unmodified or modified), the reference electrode an Ag/AgCl electrode (3M KCl) and the auxiliary electrode a platinum wire. The studies are done using cyclic voltammetry (CV) in Britton-Robinson buffer solution (BRBS, pH 2.0) as a supporting electrolyte at scan rate of 50 mV/s. The preliminary results show that in comparison to modified screen-printed carbon electrodes, unmodified electrodes give increased current signals where the redox reaction of riboflavin occurs. Unmodified screen-printed electrodes usually give high responses due to the more hydrophilic surface and are very easy to handle, with excellent sensitivity and as low cost electro-analytical tools. Nevertheless, the results seem promising that the the modifier free sensor can be applied for the quick quantification of riboflavin.

Keywords:

Riboflavin, Cyclic Voltammetry, Electrochemical Sensor, Screen-printed carbon electrode.

Session Chair

Valon Ejupi

Session Co-Chair

Dafina Krasniqi

Proceedings Editor

Edmond Hajrizi

ISBN

978-9951-550-19-2

First Page

43

Last Page

49

Location

Pristina, Kosovo

Start Date

26-10-2019 11:30 AM

End Date

26-10-2019 1:00 PM

DOI

10.33107/ubt-ic.2019.28

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Oct 26th, 11:30 AM Oct 26th, 1:00 PM

Comparative electrochemical study on the effects of heterogeneous carbon nanostructured-materials on the properties of screen-printed carbon electrodes towards Riboflavin determination

Pristina, Kosovo

In this work, the influence of graphene nanoribbons (GNs), graphene nanoplatelets (GNPls), multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO) as a modifier on the properties of screen-printed carbon electrodes towards electrochemical determination of riboflavin (VB2) is investigated. Additionally, ionic liquid (IL, 1-Butyl-2,3-dimethylimidazolium tetra fluoroborate), iron(II) phthalocyanine (FePc) and Nafion were added into the modifier suspensions and further tested for their electro-catalytic effect. Their performance as modifier is compared to unmodified screen-printed carbon electrodes (SPCE). Unmodified screen-printed electrodes are printed in laboratory onto the ceramic substrate using carbon ink. Modified electrodes are prepared by drop-casting modifier suspension onto the active surface area of SPCE. The three-electrode system is used, consisted of a glass vessel equipped with the screen-printed carbon electrode as a working electrode (unmodified or modified), the reference electrode an Ag/AgCl electrode (3M KCl) and the auxiliary electrode a platinum wire. The studies are done using cyclic voltammetry (CV) in Britton-Robinson buffer solution (BRBS, pH 2.0) as a supporting electrolyte at scan rate of 50 mV/s. The preliminary results show that in comparison to modified screen-printed carbon electrodes, unmodified electrodes give increased current signals where the redox reaction of riboflavin occurs. Unmodified screen-printed electrodes usually give high responses due to the more hydrophilic surface and are very easy to handle, with excellent sensitivity and as low cost electro-analytical tools. Nevertheless, the results seem promising that the the modifier free sensor can be applied for the quick quantification of riboflavin.