Journal
IONICS
Volume 26, Issue 5, Pages 2633-2641Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-019-03377-8
Keywords
Molecular imprinted sensor; N-MWCNT; GONRs; Estriol; Pyrrole; Electropolymerization
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A highly sensitive and selective electrochemical sensor based on a new molecularly imprinted polymer was proposed for the detection of estriol. Nitrogen-doped multi-walled carbon nanotube/graphene oxide nanoribbons (N-MWCNT/GONRs) were synthesized by the facile partially unzipping of N-MWCNTs with the help of microwave irradiation. The molecularly imprinted electrochemical sensor was fabricated by electrochemically polymerization of pyrrole onto N-MWCNT/GONR-modified Au electrode. Under the optimum condition, the sensor showed good response in the range of low concentrations from 0.1 mu g center dot mL(-1) to 20 mu g center dot mL(-1) with the detection limit (3 sigma, RSD <= 5%) of 2 ng center dot mL(-1). Estradiol, diethylstilbestrol, oestrone bisphenol A, and ethinyloestradiol had negligible interference in the determination of estriol even when the concentration molar ratio reaches 50:1. The developed sensor had been applied to the reliable analysis of estriol in clinic samples and in real water samples with satisfactory results.
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