Fujian Provincial Bureau of Quality and Technical Supervision

Zhangzhou, China

Fujian Provincial Bureau of Quality and Technical Supervision

Zhangzhou, China
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Huang Y.-Q.,Zhangzhou Normal University | Huang Y.-Q.,Fujian Medical University | Cai P.-Y.,Zhangzhou Normal University | Liu J.-M.,Zhangzhou Normal University | And 5 more authors.
RSC Advances | Year: 2014

CdTe-Cys-QDs with a grain diameter of 10.2 nm were synthesized by modifying CdTe quantum dots (QDs) using cysteine (Cys), and their structure was characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and fluorescence spectroscopy. The CdTe-Cys-QDs could emit a strong and stable room temperature phosphorescence (RTP) on the polyamide membrane (PAM), and they were oxidized by H2O2 to form CdTe-Cys-QDs', resulting in increasing defects on the surface of the CdTe-Cys-QDs and the RTP signals to quench. More interestingly, As(v) can catalyze H2O2 to oxidize the CdTe-Cys-QDs, to quench the RTP signal of the system sharply, showing that the catalyzing reaction has a signal amplification effect on the RTP of the system. Based on the above phenomenom, a new CdTe-Cys-QDs phosphorescence sensor for the determination of trace As(v) has been developed. This simple, rapid and sensitive (the limit of detection (LOD) is 2.1 × 10-18 g mL-1.) CdTe-Cys-QDs phosphorescence sensor has been utilized to detect As(v) in human hair, tea and water samples, and the results are consistent with those obtained by atomic absorption spectrometry (AAS). Meanwhile, the morphological characterization changes of the CdTe-QDs and CdTe-Cys-QDs were characterized by transmission electron microscopy (TEM), X-ray powder diffraction (XRD) spectra and fluorescence spectroscopy. Furthermore, the sensing mechanism for the determination of As(v) by CdTe-Cys-QDs phosphorescence sensor was also discussed. © 2014 The Royal Society of Chemistry.


Liu J.-M.,Zhangzhou Normal University | Jiao L.,Zhangzhou Normal University | Zhang L.-H.,China Institute of Technology | Zheng Z.-Y.,China Institute of Technology | And 3 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

Hg0, the product of vitamin C (Vc) reducing Hg2+, could react with Au along on the longitudinal axis of gold nanorods (AuNRs) to form gold amalgamation (AuHg2(L)), which caused the longitudinal surface plasmon resonance (LSPR) absorption peak of AuNRs to blue shift (Δλ) and the absorbance (A) to decrease. However, the strong coordination between hydrosulfide group (SH) in cysteine (Cys) and Hg 2+ can effectively inhibit the formation of AuHg2(L), resulting in that the LSPR absorption peak of AuNRs red shift (Δλ), the corresponding absorbance enhances as well as the color of solution obviously changes. Thus, a responsive, sensitive and simple non-aggregation AuNRs colorimetric sensor for the determination of Cys has been developed based on the inhibiting effect of Cys on Vc reducing Hg2+. The limit of quantitation (LOQ) of this sensor is 0.030 μM, which is much lower than that of aggregation colorimetric sensor and gold nanocluster fluorometry, showing its great sensitivity. What is more, the sensor has been applied to the detecting of Cys in human urine samples with the results agreeing well with inductively coupled plasma-mass spectroscopy (ICP-MS), showing its great practicality. Furthermore, the morphological changes of AuNRs were characterized by high resolution transmission electron microscope (HRTEM) and the sensing mechanism for the determination of Cys was also discussed. © 2013 Elsevier B.V.


Liu J.-M.,Zhangzhou Normal University | Jiao L.,Zhangzhou Normal University | Cui M.-L.,Zhangzhou Normal University | Lin L.-P.,Zhangzhou Normal University | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

I- could accelerate the selective etching along longitudinal direction of gold nanorods (AuNRs) induced by Fe3+ in HCl medium, which decreased the aspect ratio (length/width) of AuNRs, and thus the longitudinal surface plasmon resonance (LSPR) absorption peaks of AuNRs blue shifted (Δλ = λ0 - λ), the corresponding absorbance decreased (ΔA = A0 - A), and the color of the solution obviously changed. Therefore, a non-aggregation AuNRs colorimetric sensor for the detection of I- was developed. The proposed colorimetric sensor is responsive, simple, selective and sensitive with the limit of quantization (LOQ) of 8.8 × 10-8 M. The highly accurate sensor has been used to determine the content of I- in table salt samples with the results consistent with those obtained by inductively coupled plasma-mass spectroscopy (ICP-MS). Moreover, the morphological changes of AuNRs during the etching procedure were characterized by high resolution transmission electron microscopy (HRTEM) and the sensing mechanism for I - detection was also discussed. © 2013 Elsevier B.V.


Liu J.-M.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Lin L.-P.,Zhangzhou Normal College | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

Polyamide membrane-wheat germ agglutinin-poly vinyl alcohol-affinity adsorption imprinting (abbreviated to PAM-WGA-PVA-AAI) was prepared using alkaline phosphatase (AP) as the template. The cavity in PAM-WGA-PVA-AAI not only matched with AP very well, but also had a sensitive response to AP. The Morin-SiO2-AbAP was obtained using Morin-SiO2 to label AbAP (goat anti human AP antibody). When Ab AP-Morin-SiO2 was added to PAM-WGA-PVA-AAI, PAM-AP-Ab AP-Morin-SiO2 formed by the immunoreaction between Ab AP and AP in PAM-WGA-PVA-AAI due to the affinity between Ab AP and AP was stronger than that between AP and WGA. The product could emit room temperature phosphorescence (RTP) because of the heavy atom effect of Pb2+. Motivated by the sensitive response of cavity in PAM-WGA-PVA-AAI to AP, a new PAM-WGA-PVA-AAI phosphorescence sensor for determination of trace AP and prediction of human diseases has been developed using PAM-WGA-PVA-AAI technique. The proposed sensor was sensitive (the detection limit (DL): 0.18 ag spot-1, corresponding concentration: 7.2 × 10-17 g mL-1 or 7.2 × 10-19 mol L-1), simple, rapid and highly selective, and it has been applied to the determination of trace AP in human serum and the forecast of human diseases, with the results agreeing well with those obtained by enzyme-linked immunoassay (ELISA). Meanwhile, the mechanism of this PAM-WGA-PVA-AAI phosphorescence sensor was discussed also. © 2013 Elsevier B.V.


Liu J.-M.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | Jiang S.-L.,Fujian Provincial Bureau of Quality and Technical Supervision | Wang X.-X.,Zhangzhou Normal College | And 4 more authors.
Analytical Methods | Year: 2013

Gold nanoclusters (AuNCs) protected by bovine serum albumin (BSA) can emit red photoluminescence under illumination by ultraviolet light. The luminescence of the BSA-AuNCs was quenched when Cu2+ chelated with glycine in the BSA chain and generated BSA-AuNCs-Cu2+, while the luminescence of the BSA-AuNCs restored when pyrophosphate ion (P2O7 4-, PPi) was added and chelated with Cu2+, resulting in Cu2+ being removed from the surface of BSA-AuNCs. Bearing this in mind, herein we present a novel BSA-AuNCs-Cu2+ fluorescent sensor for PPi detection. This environmentally-friendly, simple, rapid and selective fluorescent sensor possesses a wide linear range (0.16-78.1 μM) and a high sensitivity (the limit of detection (LD) is 0.083 μM), which could also determine PPi in the effluent of copper plating with the results consistent with those obtained by absorptiometry. Furthermore, the morphologies of BSA-AuNCs, BSA-AuNCs-Cu2+ and BSA-AuNCs-Cu2+-PPi were characterized by high resolution transmission electron microscopy (HRTEM). The mechanism of the proposed assay for PPi detection has been discussed. © 2013 The Royal Society of Chemistry.


Liu J.-M.,Zhangzhou Normal College | Huang X.-M.,Zhangzhou Normal College | Huang X.-M.,China Institute of Technology | Zhang L.-H.,Zhangzhou Normal College | And 9 more authors.
Analytica Chimica Acta | Year: 2012

The present study proposed a simple sensitive and specific immunoassay for the quantification of calcitonin (CT) in human serum with water-soluble multi-walled carbon nanotubes (MWNTs). The COOH group of MWNTs could react with the NH group of rhodamine S (Rhod.S) molecules to form Rhod.S-MWNTs, which could emit room temperature phosphorescence (RTP) on acetate cellulose membrane (ACM) and react with Tween-80 to form micellar compound. Tween-80-Rhod.S-MWNTs (TRM), as a phosphorescent labelling reagent, could dramatically enhance the RTP signal of the system. The developed TRM phosphorescent reagent was used to label anti-calcitonin antibody (AbCT) to form the TRM-AbCT labelling product, which could take high specific immunoreaction with CT, and the ΔIp (= Ip2-Ip1, Ip2 and Ip1 were the phosphorescence intensity of the test solution and the blank sample, respectively) of the system was linear to the content of CT. Hence, a new solid substrate room temperature phosphorescence immunoassay (SSRTPIA) was established for the determination of CT in human serum. This sensitive (limit of quantification (LOQ) was 8.0×10-14gmL-1), accurate, selective and precise method has been applied to determine CT in human serum and predict primary osteoporosis and fractures, with the results in good agreement with those obtained by chemiluminescence immunoassay (CLIA). Simultaneously, the structure of MWNTs was characterized with scanning electron microscopy (SEM) and infrared spectroscopy (IR), and the reaction mechanisms of both labelling AbCT with TRM and SSRTPIA for the determination of trace CT were discussed. © 2012 Elsevier B.V..


Cui M.-L.,Zhangzhou Normal College | Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Lin L.-P.,Zhangzhou Normal College | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

Bright red-emissive gold nanoclusters (AuNCs) were synthesized by a facile one-pot approach in aqueous solution using bovine serum albumin (BSA) as a protecting agent. A new BSA-AuNC fluorescent sensor for the detection of S 2- has been designed based on the sharp fluorescence quenching of BSA-AuNCs, which results from the degradation of its structure due to the formation of Au2S by the reaction between Au and S2-. The proposed highly sensitive (the detection limit [LD] was 0.029 μM) and selective sensor was applied to the detection of S2- in the presence of high concentrations of different anions in aqueous solution, and the results were in good agreement with those determined by electrochemical methods. The sensor is shown to be environmentally friendly, simple, responsive and practical. Meanwhile, the morphological changes of BSA-AuNCs and BSA-AuNCs-S2- were characterized by high-resolution transmission electron microscopy (HRTEM). Furthermore, the sensing mechanism for the detection of S2- is discussed. © 2013 Elsevier B.V.


Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | Lin L.-P.,Zhangzhou Normal College | And 3 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

Dopamine (DA) could reduce Ag+ to Ag on the surface of gold nanorods (AuNRs) to form Au core-Ag shell nanorods (Au@AgNRs) in AuNRs-Ag+-DA system, which caused dielectric function to change, the aspect ratio of AuNRs to decrease and longitudinal plasmon absorption band (LPAB) of AuNRs to blue shift (Δλ), as well as the color of the solution to change obviously. Thus, a non-aggregation colorimetric sensor for rapid determination of DA was developed based on the linear relationship between Δλ and the concentration of DA. The responsive, simple, sensitive and selective colorimetric sensor has been successfully applied to the detection of DA in serum, showing its great practicality. At the same time, the structures of AuNRs and Au@Ag NRs were characterized by transmission electron microscope (TEM). Meanwhile, the sensing mechanism for the detection of DA has been discussed. © 2012 Elsevier B.V. All rights reserved.


Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Jiao L.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | And 3 more authors.
Talanta | Year: 2013

Fe3+ can catalyze H2O2 to oxidize along on the longitudinal axis of gold nanorods (AuNRs), which caused the aspect ratio of AuNRs to decrease, longitudinal plasmon absorption band (LPAB) of AuNRs to blueshift (Δλ) and the color of the solution to change obviously. Thus, a rapid response and highly sensitive non-aggregation colorimetric sensor for the determination of Fe3+ has been developed based on the signal amplification effect of catalyzing H2O2 to oxidize AuNRs. This simple and selective sensor with a wide linear range of 0.20-30.00 μM has been utilized to detect Fe3+ in blood samples, and the results consisted with those obtained by inductively coupled plasma-mass spectroscopy (ICP-MS). Simultaneously, the mechanism of colorimetric sensor for the detection of Fe3+ was also discussed. © 2013 Elsevier B.V.


Liu J.-M.,Zhangzhou Normal University | Jiao L.,Zhangzhou Normal University | Lin L.-P.,Zhangzhou Normal University | Cui M.-L.,Zhangzhou Normal University | And 4 more authors.
Talanta | Year: 2013

A label-free non-aggregation colorimetric sensor has been designed for the detection of Cu2+, based on Cu2+ catalyzing etching of gold nanorods (AuNRs) along longitudinal axis induced by dissolve oxygen in the presence of S2O3 2-, which caused the aspect ratio (length/width) of AuNRs to decrease and the color of the solution to distinctly change. The linear range and the detection limit (LD, calculated by 10 Sb/k, n=11) of this sensor were 0.080-4.8 μM Cu2+ and 0.22 μM Cu2+, respectively. This sensor has been utilized to detect Cu2+ in tap water and human serum samples with the results agreeing well with those of inductively coupled plasma-mass spectroscopy (ICP-MS), showing its remarkable practicality. In order to prove the possibility of catalyzing AuNRs non-aggregation colorimetric sensor for the detection of Cu2+, the morphological structures of AuNRs were characterized by high resolution transmission electron microscopy (HRTEM) and the sensing mechanism of colorimetric sensor for the detection of Cu2+ was also discussed. © 2013 Elsevier B.V. All rights reserved.

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