title: A new dual-signalling electrochemical sensing strategy based on competitive host-guest interaction of a β-cyclodextrin/poly(N-acetylaniline)/graphene-modified electrode: sensitive electrochemical determination of organic pollutants.
abstract: Based on the competitive host-guest interaction between a β-cyclodextrin/poly(N-acetylaniline)/electrogenerated-graphene (β-CD/PNAANI/EG) film and probe or target molecules, a new dual-signalling electrochemical sensing method has been developed for the sensitive and selective determination of organic pollutants. As a model system, rhodamine B (RhB) and 1-aminopyrene (1-AP) were adopted as the probe and target molecules, respectively. Due to the host-guest interaction, RhB molecules can enter into the hydrophobic inner cavity of β-CD, and the β-CD/PNAANI/EG-modified glassy carbon electrode displays a remarkable oxidation peak due to RhB. In the presence of 1-AP, competitive association to β-CD occurs and the RhB molecules are displaced by 1-AP. This results in a decreased oxidation peak current of RhB and the appearance of an oxidation peak current for 1-AP, and the changes of these signals correlate linearly with the concentration of 1-AP. When the value ΔI(1-AP)+∣ΔI(RhB)∣ (ΔI(1-AP) and ΔI(RhB) are the change values of the oxidation peak currents of 1-AP and RhB, respectively) is used as the response signal to quantitatively determine the concentration of 1-AP, the detection limit is much lower than that given by using ΔI(1-AP) or ΔI(RhB) as the response signal. This dual-signalling sensor can provide more sensitive target recognition and will have important applications in the sensitive and selective electrochemical determination of electroactive organic pollutants.
authors.affiliation: State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, PR China.
authors.forename: Gangbing
authors.initials: G
authors.lastname: Zhu
authors.forename: Liang
authors.initials: L
authors.lastname: Wu
authors.forename: Xia
authors.initials: X
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Zhang
authors.forename: Jinhua
authors.initials: J
authors.lastname: Chen
mesh_terms: D000083:Acetanilides / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D004785:Environmental Pollutants / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D006841:Hydrocarbons, Aromatic / Q000032:analysis*; D008956:Models, Chemical; D011108:Polymers / Q000737:chemistry*; D011721:Pyrenes / Q000032:analysis* / Q000737:chemistry; D012235:Rhodamines / Q000032:analysis* / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D000083:Acetanilides; D004785:Environmental Pollutants; D006841:Hydrocarbons, Aromatic; D011108:Polymers; D011721:Pyrenes; D012235:Rhodamines; D047392:beta-Cyclodextrins; D002244:Carbon; D006108:Graphite; C029773:rhodamine B; C004482:1-aminopyrene