Papers by Author: Qian Xiang

Abstract: An electrochemiluminescence (ECL) sensor for highly sensitive detection of diphenhydramine was developed by employing tris (2,2-bipyridyl) ruthenium (II) as the detector. The ECL sensor was fabricated by immobilizing ECL reagent Ru (bpy)₃²⁺ on the poly-(3,4-ethylene dioxythiophene) and polystyrene sulfonate composite film (PEDOT-PSS) modified indium tin oxides (ITO) electrode by electrostatic attraction strategy. The ECL sensor showed an increased ECL intensity in the presence of diphenhydramine. The increased ECL intensity was direct proportion to the concentration of diphenhydramine over a range from 5.0 ×10^-4 to 5.0 ×10^-6 mol/L. The detection limit for the detection of diphenhydramine was 1.0 ×10^-6 mol/L. Fabrication of the ECL sensor by this method is simple and easy, and hence has potential applications in the field of ECL analysis and detection.

Abstract: As anode material of battery, manganese dioxide has been widely used in zinc-manganese and lithium–manganese primary battery. To meet new electrical products’ requirements on high-performance battery, research on rechargeable lithium manganese button batteries with extensive operating temperature, superior-performance comprehensive electrochemistry and low cost has drawn attention from more and more researchers. This article has analyzed physical and chemical properties of lithium manganese composite oxides synthetic material, assembled lithium button batteries by synthetic sample and lithium aluminum alloy and discussed its electrochemistry performance, based on confirmed material proportioning, discussed the influence of roasting condition on synthetic material performance from physical & chemical properties and electrochemistry properties, and confirmed best roasting temperature and roasting time.

Abstract: Study of the electrochmeical biosensor has become a new interdisciplinary frontier between biological detection and material science due to their excellent prospects for interfacing biological recognition events with electronic signal transduction. Nanomaterials provided a significant platform for designing a new generation of bioelectronic devices exhibiting novel functions due to their high surface-to-volume ratio, good stability, small dimension effect, good compatibility and strong adsorption ability. In this paper, we review the development of electrochemical biosensors fabricated with various nanoscale materials, also highlight the analytical applications in terms of biochemistry.

Abstract: Nanomaterials include nanometal, nanooxide, carbon nanotube, carbon nanotube composite and other types of nanomaterials. They provide a significant way for the manufacture of sensors due to their small size, larger specific surface area, surface atomic slots insufficiency and more active sites. The rapid development of electrochemical sensor fabricated with nanomaterials is of significant value. In this article, we address some of the main advances in this field over the past few years, discussing the research progress of electrochemical sensor fabricated with nanomaterials and their application.

Abstract: A fast method for the separation and determination of the food additive propyl gallate has been established by using capillary electrophoresis. The effects of several factors such as the applied potential and detection running buffer were investigated in order to obtain the optimum conditions, and the assay results were satisfactory. The limit of detection for the analyte was 10-6 mol/L. This approach has remarkable advantages with respect to other methodologies involving separations and electrochemical detection including minimal sample consumption, higher analysis speed and lower cost. In order to demonstrate the capabilitiy of the method, the determination of additive in a commercial food sample is also presented.

Abstract: A sensitive determination method for pethidine based on capillary electrophoresis-electrochemiluminescence detection was described. Analysis conditions affecting separation and detection were discussed and optimized in detail. The mixture solution of 5 mmol/L Ru(bpy)3²⁺ and 50 mmol/L phosphate buffer at pH 7.46 were added to the detection reservoir. End-column detection of pethidine was performed. Sensitive electrochemiluminescence detection was obtained at applied voltage of 1.20 V. A baseline separation of pethidine was achieved using a phosphate running buffer at pH 7.46 by electrokinetic injection for 10 s at 10 kV. A detection limit of 5.0×10^-8 M (S/N=3) was achieved.

Abstract: A capillary electrophoretic assay for determining synthetic antioxidant butylated hydroxyanisole in food has been developed. The extraction with 70% (v/v) methanol quantitatively extracted synthetic antioxidant. The separation was carried out by CZE using phosphate at a separation potential of 18 kV. Amperometric detection was achieved with an applied potential of 0.60 V. A linear relationship between the peak height and the concentration of the analyte was found in the range 1.8-180 µg/mL for BHA, with correlation coefficient of 0.994. The relative standard deviations of migration time and peak height were 0.19 and 5.3 %, respectively. The method developed was successfully applied for the determination of synthetic antioxidant butylated hydroxyanisole in food. Recovery of butylated hydroxyanisole was 93%.

Abstract: We describe the use of capillary zone electrophoresis (CZE) for the determination of tertiary butylhydroquinone (TBHQ) without derivatization or purification. The influences of buffer pH and voltage on the separation of TBHQ were studied. The internal standard method was used for the quantification of TBHQ. Amperometric detection was carried out at an applied potential of 0.80 V. The detection limit of TBHQ was found to be 10^-6 M. Peak intensity varied linearly with TBHQ concentration from 10^-4 to 5×10^-6 M. The relative standard deviation (RSD) for peak intensity and migration time was in the range of 3.58–4.36% and 0.51–0.94%, respectively. The recovery of the method in food samples is 95.36% for TBHQ. The method developed is suitable for the routine analysis of synthetic phenolic antioxidant TBHQ in samples.