Chaozhou Quality and Measurement Supervision and Inspection Institute

Chaozhou, China

Chaozhou Quality and Measurement Supervision and Inspection Institute

Chaozhou, China
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Song X.,Hubei University | Shi Z.,Hubei University | Tan X.,Hubei University | Zhang S.,Hubei University | And 3 more authors.
Sensors and Actuators, B: Chemical | Year: 2014

Exfoliated graphite was facilely prepared through one-step liquid exfoliation of graphite powder in N-methyl-2-pyrrolidone. The resulting exfoliated graphite was redispersed into N,N-dimethylformamide, and then used to modify the surface of glassy carbon electrode (GCE) via solvent evaporation. The electrochemical behaviors of tartrazine were studied, and a sensitive oxidation peak was observed. Interestingly, the oxidation peak current of tartrazine was greatly improved on the surface of exfoliated graphite-modified GCE. The considerable peak current enlargement indicates that the exfoliated graphite exhibits remarkable signal enhancement effects toward tartrazine oxidation. The influences of pH value, amount of exfoliated graphite, accumulation potential and time were examined on the oxidation signal of tartrazine. As a result, a sensitive and rapid electrochemical method was developed for the detection of tartrazine. The linear range was from 5 μg/L to 0.2 mg L-1, and the detection limit was 1.5 μg/L (2.8 nM). This new sensor was used in soft drink samples, and the detected results consisted with the values that obtained by high-performance liquid chromatography. © 2014 Elsevier B.V.


Wu C.,Huazhong University of Science and Technology | Cheng Q.,Huazhong University of Science and Technology | Li L.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Chen J.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Wu K.,Huazhong University of Science and Technology
Electrochimica Acta | Year: 2014

Graphene nanosheets (GS) were easily prepared via one-step liquid exfoliation of graphite powder in N-methyl-2-pyrrolidone, and then hybridized with porous Fe2O3 microspheres, as confirmed by the measurements of transmission electron microscopy and X-ray diffraction. Scanning electron microscopy tests indicated that the surface roughness of GS-Fe 2O3 hybrid was larger, and three-dimensional structure was more abundant. Compared with GS and Fe2O3 microspheres, the resulting GS-Fe2O3 hybrid remarkably increased the oxidation signals of bisphenol A (BPA). Moreover, the oxidation signals of BPA on GS-Fe2O3 hybrid surface was further enhanced greatly after addition of hexadecyltrimethylammonium bromide (CTAB). Based on the synergetic signal amplification of GS-Fe2O3 hybrid and CTAB, a novel electroanalytical method with high sensitivity was developed for BPA, and the limit of detection was as low as 2.5 nM. © 2013 Elsevier Ltd. All rights reserved.


Song X.,Hubei University for Nationalities | Wang B.,South-Central University for Nationalities | Huang Y.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Li L.,Chaozhou Quality and Measurement Supervision and Inspection Institute | And 4 more authors.
Talanta | Year: 2014

A polymeric film modified glassy carbon electrode was electrochemically fabricated with potential step technique using 1-butyl-3-[3-(N-pyrrole)propyl] imidazolium tetrafluoroborate ionic liquid as a monomer. Followed by being treated with sodium dodecyl sulfonate solution, a hydrophobic film bearing poly{1-butyl-3-[3-(N-pyrrolyl)propyl]imidazolium dodecyl sulfonate} moiety was modified onto electrode surface. The substitution was confirmed by X-ray photoelectron spectroscopy. The morphology of the polymeric film electrode surface was characterized with scanning electron microscopy. Electrochemical behaviors of magnolol at the hydrophobic polymeric film electrode were systematically investigated with voltammetry. Compared with the unmodified glassy carbon electrode, the oxidation peak shift slightly towards positive potential and the oxidation peak current significantly increased. Under optimal conditions, the oxidation peak current was linearly related to the magnolol concentration in the range of 1.0×10-8 to 1.0×10 -6 mol L-1 and 1.0×10-6 to 5.0×10-5 mol L-1. The detection limit was estimated to be 4.55×10-9 mol L-1 (S/N=3). The polymerized ionic liquid film electrode was successfully used to analysis magnolol in M. officinalis. The result was consistent with that obtained by high performance liquid chromatography. © 2013 Elsevier B.V.


Liu G.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Chen J.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Hou X.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Huang W.,Hubei University
Analytical Methods | Year: 2014

It is quite important to develop sensitive and simple analytical methods for the detection of toxic heavy metal ions, such as Cd2+ and Pb 2+. Herein, liquid phase-exfoliated graphene nanosheets were easily prepared through a one-step exfoliation of graphite powder in N-methyl-2-pyrrolidone. The obtained graphene suspension was directly used to modify the surface of a glassy carbon electrode (GCE), constructing a novel and highly-sensitive electrochemical sensor for Cd2+ and Pb2+. Compared with an unmodified GCE, and a reduced graphene oxide-modified GCE, the resulting liquid phase-exfoliated graphene-modified GCE significantly increased the response signals towards Cd2+ and Pb2+, showing remarkable signal amplification effects. The use of this defect-abundant, few-layered graphene sample, with small lateral flake sizes, has led to the beneficial responses observed. The influences of the supporting electrolyte, volume of the graphene suspension, deposition potential and accumulation time were examined. As a result, a sensitive, rapid and convenient electrochemical method was developed for the simultaneous detection of Cd2+ and Pb2+. The detection limits were estimated to be 1.08 μg L -1 and 1.82 μg L-1 for Cd2+ and Pb 2+. This new sensor was used in water sample analysis, and the results were consistent with the values obtained by inductively coupled plasma-atomic emission spectroscopy. © 2014 The Royal Society of Chemistry.


Xie X.,Wenzhou University | Sun D.,Wenzhou University | Liu G.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Zeng Q.,Chaozhou Quality and Measurement Supervision and Inspection Institute
Analytical Methods | Year: 2014

A kind of mesoporous silica, SBA-15, was prepared using tetraethoxysilane as the silicon source and pluronic P123 as the template. The resulting SAB-15 was then used to modify the surface of a carbon paste electrode (CPE). The electrochemical behavior of diethylstilbestrol was studied, and a sensitive oxidation peak was observed at 0.39 V in pH 4 acetate buffer. Compared with the unmodified CPE, the SBA-15 modified CPE greatly increased the oxidation peak current of diethylstilbestrol, showing strong signal enhancement effects. The influences of pH value, amount of SBA-15, accumulation potential and accumulation time were examined. As a result, a novel electrochemical method was developed for the detection of diethylstilbestrol. The linear range was from 7.5 to 300 nM, and the detection limit was 2.5 nM after 2 min accumulation. The new method was successfully used to detect diethylstilbestrol in water samples, and recovery was from 94.7% to 102.8%. © The Royal Society of Chemistry 2014.


Qu Y.,South-Central University for Nationalities | Liao N.,South-Central University for Nationalities | Chen J.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Liu G.,Chaozhou Quality and Measurement Supervision and Inspection Institute | And 2 more authors.
Nanoscience and Nanotechnology Letters | Year: 2014

Graphene-poly-L-lysine nanosheets (Gr-PLL) were synthesized and fully characterized. Tyrosinase was immobilized on the Gr-PLL nanosheets modified glassy carbon electrode which was employed as an amperometric biosensor for bisphenol A. The obtained biosensor was characterized with scanning electron microscopy and electrochemical impedance spectroscopy. Experimental conditions on the sensing performance of the as-prepared biosensor were investigated. The biosensor displayed a linear response to bisphenol A over a concentration range which spanned from 0.02 μM to 8.0 μM with a detection limit of 0.01 μM (S/N = 3). The biosensor was successfully applied to determine trace amounts of bisphenol A leaching from plastic drinking bottles. Copyright © 2014 American Scientific Publishers. All rights reserved.


Deng Y.,Hubei University of Education | Luo K.,South-Central University for Nationalities | Liu G.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Hou X.,Chaozhou Quality and Measurement Supervision and Inspection Institute | And 2 more authors.
International Journal of Electrochemical Science | Year: 2016

Polymerization of L-cysteine was performed on a glassy carbon electrode surface using cyclic voltammetric scanning from -0.2 V to 2.0 V. After being immersed in a gold nanorods solution over one night, a gold nanorod modified poly-L-cysteine film electrode (GNRs/poly-L-cysteine/GCE) was successfully fabricated. The assembling of gold nanorods onto the poly-L-cysteine film electrode was confirmed with scanning electron microscope and electrochemical impedance spectroscopy, respectively. Voltammetric behaviors of butyl hydroxy anisd (BHA) at the GNRs/poly-L-cysteine/GCE were investigated. Compared to the bare GCE, the GNRs/poly-L-cysteine/GCE exhibited significantly enhanced effects on the oxidation peak current of BHA. Square wave voltammetric responses were used for the BHA determination. Under optimized conditions, it was found that the oxidation peak current is linearly related to the BHA concentration in the range of 5.0 × 10-8 ~ 7.0 × 10-6 mol L-1. The detection limit was calculated to be 8.5 × 10-9 mol L-1 (S/N=3). The practical application of the GNRs/poly-L-cysteine/GCE was demonstrated by determining BHA in oil samples.


Wang Y.,Huazhong University of Science and Technology | Wang Y.,South-Central University for Nationalities | Liu G.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Hou X.,Chaozhou Quality and Measurement Supervision and Inspection Institute | And 3 more authors.
Microchimica Acta | Year: 2016

Cysteine (Cys) was electrochemically deposited on a glassy carbon electrode (GCE) by cyclic voltammetry. The poly-Cys modified electrode was placed in a solution of gold nanorods (GNRs) to induced self-assembly of the GNRs. The GNRs/poly-Cys/GCEs were characterized by scanning electron microscopy and electrochemical impedance spectroscopy. A voltammetric study on tetrabromobisphenol A (TBBPA) with this GCE showed the current response to be enhanced by a factor of 11 compared to a non-modified GCE. Based on these findings, a square wave voltammetric assay was worked out. Under optimized conditions, a linear relationship between the oxidation peak current and TBBPA is found for the 10 nM to 10 μM concentration range. The detection limit is 3.2 nM (at an S/N ratio of 3). The electrode was successfully applied to the determination of TBBPA in spiked tap water and lake water samples. © 2015, Springer-Verlag Wien.


Zhang S.,Hubei University for Nationalities | Chen X.,Hubei University for Nationalities | Liu G.,Chaozhou Quality and Measurement Supervision and Inspection Institute | Hou X.,Chaozhou Quality and Measurement Supervision and Inspection Institute | And 4 more authors.
Electrochimica Acta | Year: 2015

A novel ionic liquid, 4-hydroxy-1-methyl-[1-(3-pyrrolyl-propyl)]-piperidinium bromide, was synthesizedand characterized. Carboxylic-functionalized graphene oxide nanosheets were modified with this ionic liquid to fabricate a nanocomposite which was denoted as GrO-COO-IL. Characterizations of FTIR, X-ray photoelectron spectroscopy, Raman spectroscopy and transmission electron microscopy confirmed the successful conjunction of these two components. GrO-COO-IL nanocomposites were homogeneously dispersed with utralpure water, and were then coated onto glassy carbon electrode surface. Followed by cyclic voltammetric scanning, a graphene oxide-polymerized ionic liquid film modified electrode (GrO-COO-Poly-IL/GCE) was prepared, and was studied with electrochemical impedance spectroscopy and scanning electron microscope. It was found that both honokiol and magnolol exhibit sensitive voltammetric response at the GrO-COO-Poly-IL/GCE. Simultaneous assay of honokiol and magnolol was realized with differential pulse voltametry. In the presence of magnolol, the oxidation peak current was linearly related to honokiol concentration in the range of 1.0 × 10-8 ∼ 1.0 × 10-5 mol L-1 with a detection limit of 1.53 × 10-9 mol L-1 (S/N = 3). Meanwhile, in the presence of honokiol, a linear relationship between the oxidation peak current and magnolol concentration was found from 7.0 × 10-8 to 1.0 × 10-5 mol L-1. The detection limit is calculated to be 8.27 × 10-9 mol L-1 (S/N = 3). In addition, GrO-COO-Poly-IL/GCE was successfully used for determination of honokiol in the traditional Chinese medicine, and was demonstrated to be an effective and sensitive method. © 2014 Elsevier Ltd. All rights reserved.


PubMed | Chaozhou Quality and Measurement Supervision and Inspection Institute, South-Central University for Nationalities and Huazhong University of Science and Technology
Type: | Journal: Biosensors & bioelectronics | Year: 2015

A molecularly imprinted polymer film was in situ polymerized on a carboxyl functionalized multi-walled carbon nanotubes modified glassy carbon electrode surface under room temperature. This technique provides a promising imprinting approach for protein in an aqueous solution using 3-(3-aminopropyl)-1-vinylimidazolium tetrafluoroborate ionic liquid as functional monomer, N, N-methylenebisacrylamide as crossing linker, ammonium persulfate and N,N,N,N-tetramethylethylenediamine as initiator, and bovine serum albumin (BSA) as template. The molecularly imprinted polymerized ionic liquid film shows enhanced accessibility, high specificity and sensitivity towards BSA. Electrochemical sensing performance of the imprinted sensor was thoroughly investigated using K3Fe[CN]6/K4Fe[CN]6 as electroactive probes. Under optimal conditions, the current difference before and after specific recognition of BSA was found linearly related to its concentration in the range from 1.5010(-9) to 1.5010(-6) mol L(-1). The detection limit was calculated to be 3.9110(-10) mol L(-1) (S/N=3). The practical application of the imprinted sensor was demonstrated by determining BSA in liquid milk samples.

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