BIOMETALS
·
2017
·Vol. 30
·期 3
·441-447
·
IF 2.183
Wang Qingming,Sun Huifang,Sha Weilin,Chen Juan,Gu Liuyue,Wang Dong,Tang Xinhui
A novel S2O3 2− luminescent sensor (Cu2+-p-CPIP) was developed and the presence of S2O3 2− caused an obvious fluorescence enhancement at 420 nm upon excitation at 330 nm, which could be distinguished with the naked eye under a UV lamp. Remarkably, the compound exhibited excellent selective and sensitive response to S2O3 2− over other common anions with a micromolar limit of detection (0.442 μM) in DMSO/H2O (v/v, 1:1) buffer. The absorbance intensity and the color of Cu2+-p -CPIP solution changed gradually with the increase of S2O3 2− concentration. The proposed method was applied to the determination of S2O3 2− in milk samples and the recoveries were 97.5–105%. The preparation of Cu2+-p -CPIP exhibited the quick, simple and facile advantages. The results showed that Cu2+-p -CPIP can be a good candidate for simple, rapid and sensitive colorimetric detection of S2O3 2− in aqueous solution.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2016
·Vol. 32
·期 6
·992-995
·
IF 1.086
Liu Lihong,Wang Chunfeng,Zhuo Kelei
A sensitive electrochemical sensor for determining bisphenol A(BPA) was designed. The sensor was a glassy carbon electrode modified with the surfactant cetyltrimethylammonium bromide and the ionic liquid 1-decyl-3-methylimidazolium tetrafluoroborate. The ability of the new sensor to measure BPA was investigated in cyclic voltammetry experiments. Under optimized conditions, the sensor gave a linear response range for BPA of 2.19×10 −7 ―3.28×10 −5 mol/L and a detection limit of 7.31×10 −8 mol/L( S/N =3). BPA could be determined with a lower detection limit, a wider linear range, and more sensitivity using the sensor than using other electrochemical sensors or high performance liquid chromatography with UV detection. The new sensor was used to determine BPA in tap water with recoveries of 97.5%―98.7% and a relative standard deviation <2.9%. The results show that the sensor can be used to determine trace BPA concentrations in tap water.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 3
·961-968
·
IF 4.58
Dong Tiantian,Tang Qinghui,Zhao Kang,Deng Anping,Li Jianguo
The authors describe a dual signal amplification electrochemiluminescent (ECL) immunoassay for ultrasensitive determination of the β-adrenergic agonist salbutamol (SAL). It is based on the use of gold nanoparticles (AuNPs) and silica-coated quantum dots of the type CdSe@SiO 2 . The CdSe@SiO 2 nanoparticles (NPs) were synthesized by water-in-oil reversed-phase microemulsion. Amino-modified NPs were then prepared and used as an ECL signal probe for detection of SAL in the presence of K 2 S 2 O 8 . The gold NPs with their large specific surface carry the antigen, facilitate electron transfer and improve the electrochemical reaction efficiency of QDs and K 2 S 2 O 8 . The ECL immunosensor was fabricated by coating the AuNPs with antigen, and then SAL competed with SAL antigen for the binding sites of the antibody on the CdSe@SiO 2 NPs. Under optimized conditions, the ECL intensity is linearly related to the logarithm of the SAL concentration in the range from 0.001 to 1000 ng mL −1 , with a lower detection limit of 0.17 pg mL −1 (at an S/N ratio of 3). The assay has good operational stability, is highly sensitive and selective. It is judged to possess a wider scope in that it may be applied to many other small molecule analytes for which adequate antibodies are available.
Schematic of a dual signal amplification electrochemiluminescent immunoassay for ultrasensitive detection of the β-adrenergic agonist salbutamol based on the use of gold nanoparticles and CdSe@SiO 2 .
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 10
·5807-5821
·
IF 2.599
Xiao Jianliang,Lv Weiyang,Xie Zhou,Song Yihu,Zheng Qiang
It is a challenge to develop broad-spectrum, high-efficiency, easy-recyclable adsorbents for the removal of water contaminants. Herein, l -cysteine-reduced graphene oxide/poly(vinyl alcohol) (CRG/PVA) ultralight aerogels with good mechanical strength and reusability are prepared via a direct sol–aerogel transition strategy by freeze drying. At optimized composition, the aerogel shows high adsorption efficiency toward both cationic and anionic dyes, overcoming the defect of many traditional adsorbents that usually can only remove one type of organic dyes. The adsorption is proved to involve in π – π interaction between CRG and dyes, endowing the aerogel with universality in adsorbing a wide range of conjugated dyes. Moreover, a remarkable synergetic effect is observed for removal of two oppositely charged dyes from aqueous system, yielding exceptionally high total adsorption capacities surpassing all known adsorbents examined for removing binary dyes. Thus, the CRG/PVA aerogel demonstrates great potential for usage as reusable, high-efficiency, and broad-spectrum adsorbent in water treatment.
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TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2017
·Vol. 70
·期 8
·2175-2183
·
IF 0.533
Luo Song,Jie Xiaohua,Zheng Qiongbin,Zhang Liuyan,Wu Huishu,Huang Xiaoye
In this work, we have presented a detailed study on the effect of shot peening on anodization of medium carbon steel. Anodization has been conducted on both non-shot-peened and shot-peened steel. The results show that shot peening procedure facilitates the subsequent anodization significantly. The mechanism for promoting anodization by shot peening has been discussed. After anodization, the shot-peened steel forms an amorphous α-Fe 2 O 3 film with a geometric pattern. More importantly, the α-Fe 2 O 3 film and the shot-peened layer constitute an anodized shot-peened layer, which exhibits a multi-scale structure. Due to this multi-scale structure, the anodized shot-peened layer shows a controllable wettability. It can be used as a hydrophilic or a hydrophobic coating.
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JOURNAL OF POLYMER RESEARCH
·
2017
·Vol. 24
·期 2
·1-9
·
IF 1.615
Ji Pinjun,Guo Lihua,Hu Xiaohui,Li Weimin
A series of salicylaldimine ligands 2-tert-butyl-6-((2,4-bis(diphenylmethyl)-8-arylnaphthalen)imine)-phenol ( L1 : Aryl =4- t Bu-phenyl; L2 : Aryl = p-tolyl; L3 : Aryl = phenyl; L4 : 4-CF 3 -phenyl) and the corresponding neutral salicylaldimine nickel complexes ( Ni1 - Ni4 ) were prepared and characterized. In ethylene polymerization at 20 °C, these nickel complexes are highly active, with activities of up to 6.88 × 10 5 g·mol −1 ·h −1 . Moreover, the molecular weight of the polyethylene could reach up to 8.1 × 10 5 . Comparing with the classic salicylaldimine nickel complexes Ni5 at 20 °C, complexes Ni1 with the 4- t Bu-phenyl substituent demonstrated 8 times higher activity and 35 times higher polyethylene molecular weight.
Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 8
·7042-7050
·
IF 2.741
Zhang Dai,Zhou Lifang,Lei Yajing,Zhou Zhan,Zhou Jie,Chen Shuqing
Diethylstilbestrol (DES) is used as a kind of animal feed additive and affects people’s health through the food chain. The purpose of this study is to detect the residue level of DES in 576 human urine samples directly. DES-BSA was used to immunize Balb/c mice. The monoclonal antibody was produced by hybridoma that was screened through cell fusion techniques. Finally, we developed the indirect competitive ELISA method to analyze 576 human urine samples from Zhejiang Province, China. The IC 50 of this method was 3.33 ng/mL. The LOD and LOQ were 0.16 and 0.54 ng/mL. Linear range of the standard curve was from LOD to 12.50 ng/mL. There was no cross-reactivity with two kinds of estrogens and two structural analogs with DES. Five hundred seventy-six urine samples were analyzed by the indirect competitive ELISA method, and the detection rate was 98.78%. The mean concentration and geometric mean were 4.70 and 3.50 ng/mL. The indirect competitive ELISA method based on monoclonal antibody was sensitive and reliable for the detection of DES in human urine samples. The results warned us to pay more attention to human health and food safety.
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高影响因子
CELLULOSE
·
2017
·Vol. 24
·期 3
·1483-1491
·
IF 3.417
Chen Jiachuan,Jiang Qimeng,Yang Guihua,Wang Qiang,Fatehi Pedram
Enhancing the swelling of chemithermomechanical pulp is essential for improving its physical properties and thus broadening its end-use applications. In this work, ionic liquid (IL) using 1-allyl-3-metheylimidazolium chloride ([Amim]Cl) was used for reducing hydrogen bonding within the fiber wall, and ultrasonic treatment was used for improving the performance of IL treatment. Mixing IL with pulp fibers at 5 ml/g concentration decreased the Canadian standard freeness (CSF) of pulp from 760 to 570 ml at room temperature, and the pretreatment with ultrasonic treatment for 20 min reduced its CSF to 545 ml. The ultrasonic-assisted IL treatment improved the tensile, tear and burst indices as well as the folding endurance of the cellulosic network by 41, 36, 12 and 150%, respectively. The surface charge density and area of fibers were improved, but the lignin and hemicellulose contents of the fibers were reduced via ultrasonic-assisted IL treatment.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 3
·400-406
·
IF 1.692
Wei Wan-chu,Feng Shuo,Zheng Cai-xia,Liang Guo-dong,Zhu Fang-ming
The fluorescently labelled polymers including pyrene-labelled polystyrene (PyPS) and pyrene-labelled poly(methyl methacrylate) (PyPMMA) with narrow molecular weight distributions were synthesized by the atom transfer radical copolymerization (ATRCP) of styrene or methyl methacrylate with 1-pyrenemethyl methacrylate (PyMMA). The ultrathin PyPS and PyPMMA films with the thickness ranging from 30 nm to 400 nm supported on the quartz slides were prepared by spin-coating. The fluorescent quantum yield (QY) of the pyrene probe in the ultrathin polymer films was investigated by the photoluminescence spectrometer using an integrating sphere detector. The QY decreased with the reduction of film thickness in the sub-200 nm range.
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Botanical Studies
·
2016
·Vol. 57
·期 1
·1-11
·
IF 1.159
Shi Qiang-Qiang,Dang Jun,Wen Huai-Xiu,Yuan Xiang,Tao Yan-Duo,Wang Qi-Lan
Background
Dracocephalum heterophyllum was a traditional Tibetan medicine possesses various pharmacological effects involved in anti-inflammatory, antibacterial activities. However, its anti-hepatitis, antioxidant activity and bioactive compounds have not been reported, the objective of this research work was to investigate the pharmacological activity and bioactive compounds of D. heterophyllum extracts. Results In the present study, the anti-hepatics and antioxidant activities of four D. heterophyllum extracts (i.e. petroleum ether extracts, ethyl acetate extracts, n -BuOH extracts, and water extracts) were conducted. The main chemical constituent of petroleum ether and ethyl acetate extracts were also isolated using chromatographic techniques and identified by NMR spectroscopic methods. The anti-hepatitis assay showed that the petroleum ether and ethyl acetate extracts of D. heterophyllum significantly prolonged the mean survival times and reduced the mortality of mouse hepatitis model induced by concanavalin A (ConA). The levels of alanine transaminase, aspartate transaminase in blood serum could be decreased obviously by ethyl acetate extracts compared with ConA group (P < 0.01). The histological analysis demonstrated that the ethyl acetate extracts could inhibit apoptosis and necrosis caused by ConA. In addition, the antioxidant activities of the four extracts of D. heterophyllum were measured by DPPH assay, ABTS assay, anti-lipidperoxidation assay, ferric reducing antioxidant power assay, ferrous metal ions chelating assay and determination of total phenolic contents. The results showed that the ethyl acetate extract had the highest antioxidant activities, followed by petroleum ether extract. Finally, nine mainly compounds were isolated from the Petroleum ether and ethyl acetate extracts, including four triterpenes: oleanolic acid ( 1 ), ursolic acid ( 2 ), pomolic acid ( 3 ), 2α- hydroxyl ursolic acid ( 4 ), three flavonoids: apigenin-7- O -rutinoside ( 5 ), luteolin ( 8 ), diosmetin ( 9 ) and two phenolic acids: rosmarinic acid ( 6 ), methyl rosmarinate ( 7 ). Conclusion The Ethyl acetate extract of D. heterophyllum had the highest anti-hepatitis and antioxidants activities, followed by petroleum ether extract. The bioactive substances may be triterpenes, flavonoids and phenolic acids, the ethyl acetate extracts of D. heterophyllum may be possible candidates in developing anti-hepatitis medicine.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 25
·7173-7180
·
IF 3.125
Guo Weiwei,Zhang Amin,Zhang Xin,Huang Chusen,Yang Dapeng,Jia Nengqin
An electrochemiluminescence (ECL) sensor for bisphenol A was proposed by using l -cysteine-functionalized multiwalled carbon nanotubes/gold nanocomposites-modified glassy carbon electrode (MWCNTs-Au/GCE) based on ECL of peroxydisulfate solution. The ECL behaviors of peroxydisulfate solution had been investigated at the chitosan/MWCNTs-Au/GCE, and bisphenol A was found to have quenching effects on the ECL of peroxydisulfate solution. Both Au nanoparticles (AuNPs) and multiwalled CNTs could promote the electron transfer and synergetically amplify the ECL signal of peroxydisulfate solution. Under the optimized conditions, the ECL signal intensity was linear with the concentration of bisphenol A in the concentration range between 0.25 and 100 μM ( R = 0.9931) with a detection limit (S/N = 3) of 0.083 μM. The constructed ECL sensor has the advantages of simplicity, sensitivity, good selectivity, and reproducibility, exhibiting a great potential application in the determination of bisphenol A.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 7
·1-9
·
IF 2.101
Wan Xuejuan,Li Shifeng,Zhuang Lulu,Tang Jiaoning
l -Tryptophan-capped carbon quantum dots ( l -CQDs) were facilely synthesized through “green” methodology, and the obtained material was utilized as a sensitive and selective fluorescence sensor for mercury ion (Hg 2+ ) in pure aqueous solutions. Carboxyl-functionalized CQDs were first green synthesized by a one-step hydrothermal route, and l -tryptophan was then attached to CQDs via direct surface condensation reaction in aqueous solution at room temperature. The as-synthesized l -CQDs had an average size of ca. 5 nm with a good dispersity in water, and exhibited a favorable selectivity for Hg 2+ ions over a range of other common metal cations in aqueous solution (10 mM PBS buffer, pH 6.0). Upon the addition of Hg 2+ , a complete fluorescence quenching (ON–OFF switching) of l -CQDs was evident from the fluorescence titration experiment, and the fluorescence detection limit of Hg 2+ was calculated to be 11 nM, which indicated that the obtained environmentally friendly l -CQDs had sensitive detection capacity for Hg 2+ in aqueous solution.
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