title: Molecularly imprinted electrochemical sensor for propyl gallate based on PtAu bimetallic nanoparticles modified graphene-carbon nanotube composites.
abstract: A novel molecularly imprinted electrochemical sensor for propyl gallate (PG) determination was developed via electropolymerization of an o-phenylenediamine membrane in the presence of template molecules on glassy carbon electrode surface modified by PtAu bimetallic nanoparticles-capped graphene-carbon nanotubes composites (PtAu-GrCNTs). The modified electrodes were characterized by cyclic voltammetry, scanning electron microscope, x-ray diffraction and chronoamperometry. Moreover, experimental parameters such as scan cycles, incubation time, molar ratios of template molecules to functional monomers and extraction time were optimized. It was found that the PtAu-GrCNTs composite could effectively enhance the electron transfer efficiency and remarkably improve the sensitivity of the sensor. The results revealed the sensor displayed superb resistance to no-specific binding, very attractive detection limit as low as 2.51×10(-8) mol/L, and a wide linear range from 7×10(-8) mol/L to 1×10(-5) mol/L towards PG. Furthermore, the MIPs sensor was also successfully used for the detection of PG in food samples. Therefore, the MIPs-based electrochemical sensing strategy might provide a sensitive, rapid, and cost-effective method for PG determination and related food safety analysis.
authors: College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, PR China.
authors: Min
authors: M
authors: Cui
authors: School of Biological Science and Technology, University of Jinan, Jinan 250022, PR China.
authors: Jiadong
authors: J
authors: Huang
authors: School of Biological Science and Technology, University of Jinan, Jinan 250022, PR China.
authors: Yu
authors: Y
authors: Wang
authors: College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, PR China. Electronic address: wuyumin005@163.com.
authors: Yumin
authors: Y
authors: Wu
authors: Key Laboratory of Sensor Analysis of Tumor Marker, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, PR China. Electronic address: xiliangluo@hotmail.com.
authors: Xiliang
authors: X
authors: Luo
mesh_terms: D015374:Biosensing Techniques; D055664:Electrochemical Techniques; D006046:Gold / Q000737:chemistry; D006108:Graphite / Q000737:chemistry; D057230:Limit of Detection; D054802:Molecular Imprinting; D037742:Nanotubes, Carbon / Q000737:chemistry; D010984:Platinum / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011435:Propyl Gallate / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D037742:Nanotubes, Carbon; D011108:Polymers; D010984:Platinum; D006046:Gold; D006108:Graphite; D011435:Propyl Gallate
keywords: Electrochemical sensor; Graphene–carbon nanotubes composites; Molecularly imprinted polymers; Propyl gallate; PtAu bimetallic nanoparticles