Construction of amperometric biosensor modified with conducting polymer/carbon dots for the analysis of catechol

Yasa M., Deniz A., Forough M., YILDIRIM E., PERSİL ÇETİNKOL Ö., UDUM Y., ...More

JOURNAL OF POLYMER SCIENCE, vol.58, no.23, pp.3336-3348, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 58 Issue: 23
  • Publication Date: 2020
  • Doi Number: 10.1002/pol.20200647
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3336-3348
  • Keywords: carbon dots, catechol, conjugated polymer, enzyme-based biosensor, phenolic compounds, CARBON NANOTUBES, GRAPHENE OXIDE, POLYMERS, DENSITY, COMPOSITE, LACCASE, DESIGN
  • Gazi University Affiliated: Yes


Phenolic compounds used in food industries and pesticide industry, are environmentally toxic and pollute the rivers and ground water. For that reason, detection of phenolic compounds such as catechol by using simple, efficient and cost-effective devices have been becoming increasingly popular. In this study, a suitable and a novel matrix was composed using a novel conjugated polymer, namely poly[1-(5-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophen-2-yl)furan-2-yl)-5-(2-ethylhexyl)-3-(furan-2-yl)-4H thieno[3,4-c]pyrrole-4,6(5H)-dione] (PFTBDT) and carbon dots (CDs) to detect catechol. PFTBDT and CDs were synthesized and the optoelectronic properties of PFTBDT were investigated via electrochemical and spectroelectrochemical studies. Laccase enzyme was immobilized onto the constructed film matrix on the graphite electrode. The proposed biosensor was found to have a low detection limit (1.23 mu M) and a high sensitivity (737.44 mu A/ with a linear range of 1.25-175 mu M. Finally, the applicability of the proposed enzymatic biosensor was evaluated in a tap water sample and a satisfactory recovery (96-104%) was obtained for catechol determination.