title: "Sign-on/off" sensing interface design and fabrication for propyl gallate recognition and sensitive detection.
abstract: A new strategy based on sign-on and sign-off was proposed for propyl gallate (PG) determination by an electrochemical sensor. The successively modified poly(thionine) (PTH) and molecular imprinted polymer (MIP) showed an obvious electrocatalysis and a good recognition toward PG, respectively. Furthermore, the rebound PG molecules in imprinted cavities not only were oxidized but also blocked the electron transmission channels for PTH redox. Thus, a sign-on from PG current and a sign-off from PTH current were combined as a dual-sign for PG detection. Meanwhile, the modified MIP endowed the sensor with recognition capacity. The electrochemical experimental results demonstrated that the prepared sensor possessed good selectivity and high sensitivity. A linear ranging from 5.0×10(-8) to 1.0×10(-4)mol/L for PG detection was obtained with a limit of detection of 2.4×10(-8)mol/L. And the sensor has been applied to analyze PG in real samples with satisfactory results. The simple, low cost, and effective strategy reported here can be further used to prepare electrochemical sensors for other compounds selective recognition and sensitive detection.
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000 PR China; The Key Laboratory of Functional Molecular Solids, Ministry of Education, PR China; Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Chemo-Biosensing, PR China.
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Dai
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000 PR China; The Key Laboratory of Functional Molecular Solids, Ministry of Education, PR China; Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Chemo-Biosensing, PR China.
authors.forename: Xueyan
authors.initials: X
authors.lastname: Li
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000 PR China; The Key Laboratory of Functional Molecular Solids, Ministry of Education, PR China; Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Chemo-Biosensing, PR China.
authors.forename: Limei
authors.initials: L
authors.lastname: Fan
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000 PR China; The Key Laboratory of Functional Molecular Solids, Ministry of Education, PR China; Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Chemo-Biosensing, PR China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Lu
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000 PR China; The Key Laboratory of Functional Molecular Solids, Ministry of Education, PR China; Anhui Laboratory of Molecule-Based Materials, Anhui Key Laboratory of Chemo-Biosensing, PR China. Electronic address: kanxw@mail.ahnu.edu.cn.
authors.forename: Xianwen
authors.initials: X
authors.lastname: Kan
mesh_terms: D003217:Conductometry / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005503:Food Additives / Q000032:analysis; D005504:Food Analysis / Q000295:instrumentation; D054802:Molecular Imprinting / Q000379:methods*; D011108:Polymers / Q000737:chemistry*; D011435:Propyl Gallate / Q000032:analysis* / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013876:Thiophenes / Q000737:chemistry*
chemical_list: D005503:Food Additives; D011108:Polymers; D013876:Thiophenes; C066730:polythiophene; D011435:Propyl Gallate
keywords: Dual-sign; Electrochemical sensor; Molecular imprinted polymer; Poly(thionine); Propyl gallate