DALTON TRANSACTIONS
·
2014
·Vol. 43
·期 26
·10057-10063
·
IF 4.097
Xin Yang,Junhai Wang,Dongyue Su,Qingdong Xia,Fang Chai,Chungang Wang,Fengyu Qu
Rapid and sensitive detection of 2,4,6-trinitrotoluene (TNT) and 4-nitrophenol (4-NP) has attracted considerable attention due to their wide applications as nitroaromatic explosive materials. A novel fluorescence method for TNT and 4-NP based on bovine serum albumin functionalized fluorescent gold nanoclusters (BSA Au-NCs) has been developed. The detection probe BSA Au-NCs can be used as a fluorescent probe for the sensitive and selective detection of TNT and 4-NP simultaneously. A good linearity of fluorescence detection using BSA Au-NCs as a fluorescent probe was observed for TNT and 4-NP concentrations in the range of 10−8–5 × 10−5 M and 10−9–5 × 10−5 M, with a detection limit of 10 nM and 1 nM, respectively. The high specificity of TNT and 4-NP with BSA Au-NCs interactions provided excellent selectivity towards detecting TNT and 4-NP over other relevant nitroaromatic compounds. This system can be applied to test strips to detect TNT and 4-NP with high sensitivity and selectivity. The vapour of TNT and 4-NP can be detected using BSA Au-NCs test paper within 1 min with a detection limit of 10 pM and 1 pM.
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ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Zhenning Xu,Huanshun Yin,Yunxiang Han,Yunlei Zhou,Shiyun Ai
In this work, a novel electrochemical protocol with signal amplification for determination of DNA methylation and methyltransferase activity using DNA-based hybridization chain reaction (HCR) was proposed. After the gold electrode was modified with dsDNA, it was treated with M. Sss I MTase, H pa II endonuclease, respectively. And then the HCR was initiated by the target DNA and two hairpin helper DNAs, which lead to the formation of extended dsDNA polymers on the electrode surface. The signal was amplified by the labeled biotin on the hairpin probes. As a result, the streptavidin-alkaline phosphatase (S-ALP) conjugated on the electrode surface through the specific interaction between biotin and S-ALP. ALP could convert 1-naphthyl phosphate into 1-naphthol and the latter could be electrochemically oxidized, which was used to monitor the methylation event and MTase activity. The HCR assay presents good electrochemical responses for the determination of M. Sss I MTase at a concentration as low as 0.0067 unit mL −1 . Moreover, the effects of anti-cancer drug and environmental phenolic hormone on M. Sss I MTase activity were also investigated. The results indicated that 5-fluorouracil and daunorubicin hydrochloride could inhibit the activity, and the opposite results were obtained with bisphenol A and nonylphenol. Therefore, this method can not only provide a platform to screen the inhibitors of DNA MTase and develop new anticancer drugs, but also offer a novel technique to investigate the possible carcinogenesis mechanism.
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MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 11
·1223-1230
·
IF 3.719
Wang Ke,Wei Xiuhua,Tu Yifeng
This paper reports on the synthesis of AuAg and PtAg alloy nanoclusters (NCs) and their enhancement effect on the electrochemiluminescence (ECL) of luminol. The conditions of synthesis were optimized, and the structure and properties of the NCs were characterized by X-ray diffraction, transmission electron microscopy, electrochemistry, and optical spectroscopy. The NCs are found to intensify (by up to 20 times) the ECL of luminol in solution of pH 8.5. This finding can largely extend the useful pH range of the ECL of luminol. The enhanced ECL is strongly affected by oxygen and hydrogen peroxide, and the mechanism of enhancement is attributed to the accelerated production of reactive oxygen species. The enhanced ECL is also affected by phenolic artificial estrogens, and this was used for their determination with detection limits as low as 700 pg L− 1 (with AuAg) and 1.6 ng L− 1 (with PtAg). The method was applied to the determination of such estrogens in egg samples using diethylstilbestrol as a reference substance.
The alloy nanoclusters (AuAg/PtAg) have been synthesized. They enhance the electrochemiluminescence of luminal for about 20 times in pH 8.5 solution. It extended the practicable pH range of ECL and can be employed for detecting the oxygen matters and other related trace compounds.
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Analytical Methods
·
2014
·Vol. 6
·期 16
·6316-6321
·
IF 1.938
Meng Sun,Qiuhua Wu,Chun Wang,Zhi Wang
Poly(vinylidene fluoride) (PVDF) has attracted enormous attention as a membrane material with regard to its excellent properties in recent years. In this paper, a new sample preparation technique, the PVDF membrane as the extraction phase, has been applied to the extraction of four endocrine-disrupting compounds: bisphenol A (BPA), 4-t-octylphenol (4-t-OP), nonylphenol (NP), and 4-nonylphenol (4-NP) from water samples for the first time, prior to their determination by high performance liquid chromatography-ultraviolet detection. Some important experimental parameters affecting the extraction efficiency were optimized. Good linearity was observed over the concentration range of 1.0–100.0 ng mL−1 for BPA, and 2.0–100 ng mL−1 for 4-t-OP, NP and 4-NP with the correlation coefficients (r) greater than 0.9934. The limit of detection (S/N = 3) of the method was 0.2 ng mL−1 for BPA and 0.4 ng mL−1 for 4-t-OP, NP and 4-NP. The method is convenient, cost effective and can be a useful alternative approach for the extraction and determination of the endocrine-disrupting compounds in water samples.
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CHEMOSPHERE
·
2015
·
IF 3.34
Guanghuan Cheng,Mingyang Sun,Lingdan Yao,Lixiao Wang,George A. Sorial,Xinhua Xu,Liping Lou
The binding order of sorbent, sediment and organic compounds, as well as binding time is important factors determining the potential success of sorbent amendment, which should be considered when the practicability of sorbents was assessed. But until now, relevant research was rare. In this study, desorption in three practical conditions were simulated, by three mixing spiking orders among nonylphenol (NP), rice straw black carbon (RC) and sediment (the order of mixing spiking is (RC + Sediment) + NP, (Sediment + NP) + RC and (RC + NP) + Sediment, for situation I, II and III, respectively), to discuss the feasibility of using RC to remedy NP pollution. Results demonstrated that amendment of RC into sediment decreased desorption fractions of NP, and increased the resistant desorption fraction ( F r ), implying strong affinity of NP to RC and efficient sequestration by RC. No significant differences were observed for desorption among the three fresh situations, meaning NP may be adsorbed on RC exterior surface sites and inter-phase diffusion is faster than desorption. However, F r for three aged situations was in the order: situation I < II < III, due to NP diffusion into the inter-pores or irreversible sorption sites of RC, reducing the releasing risk of NP. Regardless of time, F r of three situations were all > 0.5, suggesting RC is an effective sorbent for remedying NP pollution in the aquatic environment. Overall, we proposed a practical and analytical method for properly assessing the validity of a sorbent.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2015
·
IF 1.955
Yonggan Hao,Xiankun Shao,Benxia Li,Luyang Hu,Tao Wang
The Au/TiO 2 hybrid nanofibers composed of mesoporous TiO 2 nanofibers and Au nanoparticles were synchronously fabricated by integrating a facile electrospinning technique and subsequent annealing in air. The Au loading content in the hybrid nanofibers was regulated by varying the dosage of chlorauric acid added in the precursor solution . The compositions, microstructures and optical response properties of the Au/TiO 2 hybrid nanofibers were characterized. The UV–vis spectra of the as-prepared hybrid fibers reveal two absorption bands belonging to the band gap absorption of TiO 2 and the surface plasmon resonance (SPR) of Au nanoparticles. For the catalytic reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride , the apparent reaction rate constant is raised but TOF value of the catalyst decreases, as the Au loading amount in the hybrid fibers increases. This is because the Au nanoparticles with smaller sizes have higher total surface areas at the same weight and therefore show higher catalytic activity . This method for producing Au/TiO 2 hybrid nanofibers is versatile and can be extended to the fabrication of other hybrid nanofibers composed of various noble metal nanoparticles and other mesoporous metal oxide nanofibers, designing of highly efficient catalysts for more important chemical reactions.
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ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Fang Long,Zhaohui Zhang,Jing Wang,Liang Yan,Biwu Zhou
A novel imprinted electrochemical sensor was prepared based on cobalt-nickel bimetallic nanoparticles by one-step electrodeposited on graphene modified carbon electrode for the sensitive determination of octylphenol. Graphene nanosheets were firstly deposited onto carbon electrode surface by electrochemistry reduction method. Then the cobalt-nickel bimetallic nanoparticles were electrodeposited on the graphene modification electrode surface. The electrochemical behaviors of the imprinted sensor were evaluated with cyclic voltammetry and electrochemical impedance spectroscopy in detail. The results showed that the prepared imprinted sensor displayed high sensitivity toward octylphenol attributing to the synergetic effect derived from the cobalt-nickel bimetallic nanoparticles and graphene. Under the optimized condition, the response currents of the imprinted sensor exhibited a linear relationship toward the negative logarithm of concentrations (С [OP] ) ranged from 1.0 × 10 −10 to 1.0 × 10 −7 mol L −1 (R = 0.998) with the detection limit of 3.6 × 10 −11 mol L −1 (S/N = 3). The imprinted electrochemical sensor was applied for the determination of octylphenol in plastic bottles, metal bottles and food packaging bags successfully.
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Analytical Methods
·
2015
·Vol. 7
·期 5
·1732-1737
·
IF 1.821
Rui Ban,Fenfen Zheng,Jianrong Zhang
We present a simple and effective fluorescence method for the detection of 2,4,6-trinitrotoluene (TNT), which is based on TNT recognition by amine-capped silicon quantum dots (SiQDs). The highly luminescent functionalized SiQDs were obtained by a one-step hydrothermal process, using 3-aminopropyltrimethoxysilane as the precursor. The as-prepared SiQDs were directly used as a recognition probe for the detection of TNT because of the strong interactions between the TNT molecule and the SiQDs with an amine group. The formation of Meisenheimer complexes (TNT–amine complexes) could quench the fluorescence of SiQDs by fluorescence resonance energy transfer. Such fluorescence response could be used to quantify TNT over the range of 5–500 nM with a detection limit down to 1 nM, and has been successfully applied for the assay of TNT in spiked tap water. The probe exhibited excellent selectivity. This method has great potential for applications in TNT detection.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2013
·
IF 2.672
Lixuan Zeng,Aizhen Zhang,Xiaohua Zhu,Chuyi Zhang,Yong Liang,Junmin Nan
The electrochemical determination of nonylphenol (NP) using differential pulse voltammetry (DPV) is developed based on a reduced graphene–DNA hybrid-modified glassy carbon electrode (GR-DNA/GCE). The electrochemical oxidation of NP at the GR-DNA/GCE is shown to be an one-electron and one-proton process, and due to the synergic effect of GR and DNA , the GR-DNA/GCE has 4.87, 2.76 and 2.09 times higher current response than bare GCE, DNA/GCE, and GR/GCE, respectively. Using DPV in the 0.1 mol L −1 acetate buffer solution at 0.1 V and with a 300 s accumulation time (pH = 4.6), the GR-DNA/GCE exhibits a linear current response towards the electrochemical oxidation of NP in the concentration range of 5.0 × 10 −8 to 4.0 × 10 −6 mol L −1 and a detection limit of 1.0 × 10 −8 mol L −1 ( S / N = 3). In addition, this GR-DNA/GCE also indicates high selectivity and reproducibility, and can be successfully used to determine the presence of NP in Asian Clams and natural water samples with comparative sensitivity to high-performance liquid chromatography, and with recoveries ranging from 95% to 103%, showing its practical prospects in the determination of NP in real samples.
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REACTIVE & FUNCTIONAL POLYMERS
·
2013
·
IF 2.505
Shi Dongjian,Sui Jing,Duan Fang,Chen Mingqing,He Bingxiao
Thermal-sensitive poly( N , N -diethylacrylamide) grafted poly(acrylonitrile/styrene) (PDEAm- g -PAN/PSt) polymeric microspheres were prepared from PDEAm macromonomer, St and AN by dispersion copolymerization . The polymeric microspheres had raspberry-like morphology with large surface area. Palladium–metal (Pd–M) (M: copper, Cu, silver , Ag) bimetallic nanoparticles were stabilized on the surface of the PDEAm- g -PAN/PSt microspheres via the coordinate interaction between amide groups in PDEAm and metal ions with the reduction of the corresponding ions. Transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and thermogravimetry analysis (TGA) results confirmed the size and composition of the immobilized Pd–M nanoparticles. The Pd–M bimetallic nanoparticles showed superior catalytic efficiencies for the reduction of 4-nitrophenol (4-NP) than the monometallic nanoparticles. The catalytic activity of the Pd–M bimetallic catalysts could be controlled by the molar ratio of Pd and M ions and composition of Pd–M nanoparticles. Moreover, the catalytic property of the Pd–M nanoparticles could be regulated by temperature and increased with increasing the temperature above lower critical solution temperature (LCST). Furthermore, the Pd–M nanoparticles could be easily recycled and reused to catalyze 4-NP for five times without loss of activity. These bimetallic nanoparticles possess great potential in future practical application in catalytic technology.
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TALANTA
·
2013
·
IF 3.498
Hong-Jun Chen,Zhao-Hui Zhang,Rong Cai,Xing Chen,Yu-Nan Liu,Wei Rao,Shou-Zhuo Yao
In this work, an imprinted electrochemical sensor based on electrochemical reduced graphene covalently modified carbon electrode was developed for the determination of 4-nonylphenol (NP). An amine-terminated functional graphene oxide was covalently modified onto the electrode surface with diazonium salt reactions to improve the stability and reproducibility of the imprinted sensor. The electrochemical properties of each modified electrodes were investigated with differential pulse voltammetry (DPV). The electrochemical characteristic of the imprinted sensor was also investigated using electrochemical impedance spectroscopy (EIS) in detail. The response currents of the imprinted electrode exhibited a linear relationship toward 4-nonylphenol concentration ranging from 1.0×10 −11 to 1.0×10 −8 g mL −1 with the detection limit of 3.5×10 –12 g mL −1 (S/N=3). The fabricated electrochemical imprinted sensor was successfully applied to the detection of 4-nonylphenol in rain and lake water samples.
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PLoS One
·
2015
·Vol. 10
·期 9
·e0137467
·
IF 3.234
Liping Lou,Lingdan Yao,Guanghuan Cheng,Lixiao Wang,Yunfeng He,Baolan Hu
Biochar adsorption presents a potential remediation method for the control of hydrophobic organic compounds (HOCs) pollution in the environment. It has been found that HOCs bound on biochar become less bioavailable, so speculations have been proposed that HOCs will persist for longer half-life periods in biochar-amended soil/sediment. To investigate how biochar application affects coupled adsorption-biodegradation, nonylphenol was selected as the target contaminant, and biochar derived from rice straw was applied as the adsorbent. The results showed that there was an optimal dosage of biochar in the presence of both adsorption and biodegradation for a given nonylphenol concentration, thus allowing the transformation of nonylphenol to be optimized. Approximately 47.6% of the nonylphenol was biodegraded in two days when 0.005 g biochar was added to 50 mg/L of nonylphenol, which was 125% higher than the relative quantity biodegraded without biochar, though the resistant desorption component of nonylphenol reached 87.1%. All adsorptive forms of nonylphenol ( f rap , f slow , f r ) decreased gradually during the biodegradation experiment, and the resistant desorption fraction of nonylphenol ( f r ) on biochar could also be biodegraded. It was concluded that an appropriate amount of biochar could stimulate biodegradation, not only illustrating that the dosage of biochar had an enormous influence on the half-life periods of HOCs but also alleviating concerns that enhanced HOCs binding by biochar may cause secondary pollution in biochar-modified environment.
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