Fujian Research Institute of Metric Science

Fuzhou, China

Fujian Research Institute of Metric Science

Fuzhou, China
SEARCH FILTERS
Time filter
Source Type

Lin L.,Xiamen University | Rong M.,Xiamen University | Luo F.,Fujian Research Institute of Metric Science | Chen D.,Fujian Research Institute of Metric Science | And 2 more authors.
TrAC - Trends in Analytical Chemistry | Year: 2014

Luminescent graphene quantum dots (GQDs) have attracted tremendous attention from the scientists in chemistry, materials science, physics and biology, because of their superiority of good stability, excellent optical and electrochemical properties, resistance to photobleaching and low cytotoxicity. We summarize the recent advances in the preparation and the properties of GQDs and their applications in environmental and biological areas. In addition, we discuss the future development of GQDs. © 2013 Elsevier Ltd.


Liu C.,Fuzhou University | Luo F.,Fujian Research Institute of Metric Science | Chen D.,Fujian Research Institute of Metric Science | Qiu B.,Fuzhou University | And 3 more authors.
Talanta | Year: 2014

A simple and rapid fluorescence method has been developed for the determination of acrylamide in heat-processed food samples. In the determination, acrylamide is degraded through Hofmann reaction to generate vinyl amine, and pyrrolinone is produced when the vinyl amine reacts with fluorescamine, resulting in a strong fluorescence emission at 480 nm. Hofmann reaction is a key step for the fluorescence determination of acrylaminde, and the reaction conditions are investigated and optimized. Under the optimal conditions, the fluorescence intensity increases with the increase of acrylamide concentrations. The linear range between the fluorescence intensity and the square-root of acrylamide concentrations is from 0.05 μg mL-1 to 20 μg mL-1 with the correlation coefficient R2=0.9935. The detection limit is 0.015 μg mL-1 and the recovery for food samples is from 66.0% to 110.6%. In comparison with Specification of Entry&Exit Inspection and Quarantine Bureau of The Peoples Republic of China (SN/T 2281-2009), the method showed comparable results and demonstrated the accuracy of the method. © 2014 Elsevier B.V. All rights reserved.


Lin C.,Xiamen University | Wu Y.,Xiamen University | Luo F.,Fujian Research Institute of Metric Science | Chen D.,Fujian Research Institute of Metric Science | Chen X.,Xiamen University
Biosensors and Bioelectronics | Year: 2014

In this work, using methylene blue (MB) as a redox marker and exonuclease III (Exo III) as an amplificatory enzyme, we developed a facile and a label-free electrochemical method for sensitive DNA detection. A double-stranded DNA (dsDNA) probe was prepared by hybridizing two single-stranded DNA (ssDNA) probes. In the ssDNA probes, one ssDNA was guanine bases free and the other one consisted of many unbound guanine bases. MB could be absorbed on the unbound guanine bases owing to the specific interaction between MB and the guanine bases. When the dsDNA probe was challenged with target DNA, it induced a simple Exo III assisted cleavage process, accompanied by the release of the unbound guanine bases. Thus, the amount of MB absorbed on the electrode was much less compared to the initial signal. The detection limit for DNA was found to be as low as 20. fM. Moreover, it could discriminate mismatched DNA from perfectly matched target DNA. This detection method is simple in design, fast in operation and can be applied to detect different DNA sequences. © 2014 Elsevier B.V.


Zhou T.,Xiamen University | Huang Y.,Xiamen University | Li W.,Xiamen University | Cai Z.,Xiamen University | And 3 more authors.
Nanoscale | Year: 2012

A facile approach was developed to prepare positively charged and red-emitting lysozyme-stabilized Ag nanoclusters (Lys-AgNCs) using NaBH 4 as a reducing agent at room temperature. The Lys-AgNCs can be applied in the highly selective detection of Hg 2+. This journal is © 2012 The Royal Society of Chemistry.


Ma C.,Wuyi University | Ji J.,Xiamen University | Tan C.,Xiamen University | Chen D.,Fujian Research Institute of Metric Science | And 3 more authors.
Talanta | Year: 2014

Oxidation has important effects on the quality of edible oils. In particular, the generation of aldehydes produced by the oxidation of oils is one of the deteriorative factors to their quality. The aim of this study was to develop a method to determine the aldehydes as lipid oxidation markers in edible oils. Seven aldehydes generated from lipid oxidation were studied using headspace solid-phase microextraction coupled to gas chromatography with a flame ionization detector. The extraction efficiency of five commercial fibers was investigated and the influence of extraction temperature, extraction time, desorption temperature, and desorption time were optimized. The best result was obtained with 85 μm carboxen/polydimethylsiloxane, extraction at 50 C for 15 min and desorption in the gas chromatography injector at 250 C for 2 min. Under the optimized conditions, the content of hexanal was the highest of the seven aldehydes in all edible oils. The limits of detection for hexanal in the three oils were found to range from 4.6 to 10.2 ng L-1. The reproducibility of the method was evaluated and the relative standard deviations were less than 8.9%. This developed approach was successfully applied to analyze hexanal in peanut oil, soy oil, and olive oil samples, and these results were compared with those obtained using the thiobarbituric acid-reactive substances (TBARs) method. © 2013 Elsevier B.V.


Qu Y.,Fuzhou University | Qu Y.,Fujian Agriculture and forestry University | Liu C.,Fuzhou University | Luo F.,Fujian Research Institute of Metric Science | And 2 more authors.
Journal of Separation Science | Year: 2013

We developed a solid-phase microextraction coupled to GC with electron-capture detection method for the detection of acrylamide in food samples. Single-walled carbon nanotubes and polypyrrole were electropolymerized onto a stainless-steel wire as a coating, which possessed a homogeneous, porous, and wrinkled surface, chemical and mechanical stability, long lifespan (over 300 extractions), and good extraction efficiency for acrylamide. The linearity range between the signal intensity and the acrylamide concentration was found to be in the range 0.001-1 μg/mL, and the coefficient of determination was 0.9985. The LOD, defined as three times the baseline noise, was 0.26 ng/mL. The reproducibility for each single fiber (n = 6) and the fiber-to-fiber (n = 5) repeatability prepared in the same batch were less than 4.1 and 11.2%, respectively. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Du Y.,Fuzhou University | Chen M.,Fuzhou University | Zhang Y.,Fuzhou University | Luo F.,Fujian Research Institute of Metric Science | And 3 more authors.
Talanta | Year: 2013

A new method for determination of iron(III) has been developed using a kind of rhodamine B derivative fluorescent probe, rhodamine amide (RHA), in acidic HAc-NaAc buffer solution. In this approach, the heavy atom effect of I 3 - was applied to quench the fluorescence of RHA. When iron(III) and KI coexisted in HAc-NaAc buffer solution, iron(III) reacted with the excess KI to produce I3 - that quenched the fluorescence of RHA through the formation of a non-fluorescence compound. The results showed that the fluorescence intensity decrease of RHA presented a good linear relationship with the iron(III) concentrations in the range from 0.5 to 5.0 μmol L-1 with the correlation coefficient of 0.9970, and the detection limit was 0.3 μmol L-1 iron(III). The approach was applied to determination of iron(III) in water samples, and the recovery was found to be from 80.7% to 100. 8%. © 2012 Elsevier B.V. All rights reserved.


Wu G.-H.,Xiamen University | Song X.-H.,Xiamen University | Wu Y.-F.,Xiamen University | Chen X.-M.,Jimei University | And 2 more authors.
Talanta | Year: 2013

A non-enzymatic electrochemical method was developed for glucose detection using a glassy carbon electrode modified with platinum nanoflowers supported on graphene oxide (PtNFs-GO). PtNFs-GO was synthesized using a nontoxic, rapid, one-pot and template-free method. Low-cost, green solvent ethanol acted as the reductant, and the advanced and effective 2D carbon material-GO nanosheet acted as the stabilizing material. Their morphologies were characterized using transmission electron microscopy. Cyclic voltammetry and amperometric methods were used to evaluate the electrocatalytic activity towards glucose in neutral media. The modified electrode exhibited strong and sensitive amperometric responses to glucose even in the presence of a high concentration of chloride ions. The response time was within 5 s. The interference effects from ascorbic acid and uric acid were comparatively small when operated at suitable potential. Under optimal detection potential (0.47 V with a saturated calomel reference electrode) the PtNFs-GO modified electrode performed a current response towards glucose at a broad concentration range from 2 μM to 20.3 mM Two linear regions could be observed at 2 μM to 10.3 mM with a sensitivity of 1.26 μA mM-1 cm-2 (correlation coefficient 0.9968), and at 10.3 mM to 20.3 mM with a sensitivity of 0.64 μA mM-1 cm -2(correlation coefficient 0.9969). The LOD of 2 μM was lower than many non-enzymatic electrochemical glucose sensors. The modified electrode was also applied to the determination of glucose in glucose injection solutions, and the satisfactory results obtained indicated that it was promising for the development of a novel non-enzymatic electrochemical glucose sensor. © 2012 Elsevier B.V. All rights reserved.


Zhang M.,Zhangzhou Normal University | Huang J.,Zhangzhou Normal University | Yu P.,Fujian Research Institute of Metric Science | Chen X.,Xiamen University
Talanta | Year: 2010

A novel protein molecularly imprinted membrane (PMIM) was synthesized on the surface of multiwalled carbon nanotubes (MWNTs) through a surface molecular imprinting technique by using bovine serum albumin (BSA) as the template molecule, acrylamide (AAm) as the functional monomer, N,N′-methylenebisacrylamide (NNMBA) as the cross-linker and ammonium persulphate [(NH4)2S2O8] as the initiator. The amounts of raw materials were optimized in this paper and the suitable amount is 0.1 g of CNTs, 0.02 g of BSA, 0.24 g of AAm, 0.1 g of MBA and 0.025 mg of (NH4)2S2O8. The selective recognition ability of PMIM/MWNTs was evaluated using adsorption experiments. Maximum adsorption capacity was 5.53 μg/mg PMIM/MWNTs and a saturation value was achieved at a BSA concentration of 0.2 mg/mL. The selectivity adsorption experiments showed that the PMIM/MWNTs also had higher adsorption capacities for BSA than for such molecules, as HSA, HB, pepsin and HRP. The PMIM/MWNTs displayed a 2.6-fold increase in affinity to BSA compared to the nPMIM/MWNTs. The PMIM/MWNTs, on the other hand, did not exhibit any significant change in affinity to other molecules compared to the nPMIM/MWNTs. In the experiment, the characteristics of the PMIM/MWNTs were analyzed using infrared spectroscopy and their configurations were observed using scanning electron microscopy. © 2009 Elsevier B.V. All rights reserved.


Cai Z.,Xiamen University | Lin Z.,Xiamen University | Chen X.,Xiamen University | Jia T.,Xiamen University | Yu P.,Fujian Research Institute of Metric Science
Luminescence | Year: 2010

An electrochemiluminescence (ECL) approach for methamphetamine determination was developed based on a glassy carbon electrode modified with a Ru(bpy)3 2+-doped silica nanoparticles/Nafion composite film. The monodispersed nanoparticles, which were about 50 nm in size, were synthesized using the water-in-oil microemulsion method. The ECL results revealed that Ru(bpy)3 2+ doped in silica nanoparticles retained its original photo- and electrochemical properties. The ECL intensity was found to be proportional to methamphetamine concentration over the range from 1.0 × 10-7 to 1.0 × 10-5 mol L-1, and the detection limit was found to be 2.6 × 10-8 mol L-1. The proposed ECL approach was used to analyze the methamphetamine content in drugs. © 2009 John Wiley & Sons, Ltd.

Loading Fujian Research Institute of Metric Science collaborators
Loading Fujian Research Institute of Metric Science collaborators