A novel capacitive sensor for pazufloxacin mesilate (pazufloxacin) determination was developed by electropolymerizing p-aminobenzene sulfonic (p-ABSA) and molecularly imprinted polymers (MIPs), which was synthesized through thermal radical copolymerization of metharylic acid (MAA) and ethylene glycol dimethacrylate (EGDMA) in the presence of pazufloxacin template molecules, on the gold electrode surface. Furthermore, 1-dedecanethiol was used to insulate the modified electrode. Alternating current (ac) impedance experiments were carried out with a Model IM6e to obtain the capacitance responses. Under the optimum conditions, the sensor showed linear capacitance response to pazufloxacin in the range of 5 ng·mL −1 to 5 μg·mL −1 with a relative standard deviation (RSD) 5.3% (n=7) and a detection limit of 1.8 ng·mL −1 . The recoveries for different concentration levels of pazufloxacin samples varied from 94.0% to 102.0%. Electrochemical experiments indicated the capacitive sensor exhibited good sensitivity and selectivity and showed excellent parameters of regeneration and stability.capacitive sensor, molecularly imprinted polymers, p-aminobenzene sulfonic acid, pazufloxacin mesilate Pazufloxacin mesilate (pazufloxacin)[(-)-(S)-10-(1-aminocyclopropyl)-9-fluoro-3-Methyl-7-oxo-2,3-dihydro-7H-pyrid[1,2,3-de][1,4]benzoxazine-6-carboxylic acid monomethanesulfonate] was a novel fourth generation quinolone antimicrobial agent [1] . It was reported firstly in 2002 in Japan and its antimicrobial activity results from a selective antagonism between host DNA and bacterial DNA without interfering with eukaryotic topoisomerases, which have the similar effect mechanism with ofloxacin and ciprofloxacin. This compound is currently widely used for the treatment of infections, such as respiratory organs infection, genitourinary organ infection, skin and parenchyma infection, and surgical infection, which is caused by Gram-negative and positive bacteria [2] . The chemical structure of pazufloxacin is shown in Figure 1.Chemiluminescence and chromatography methods were employed for the determination of pazufloxacin [3][4][5] . Figure 1 The structure of pazuflouxacin mesilate.However, these methods have suffered several disadvantages, such as low sensitivity and long detection pe-
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