INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2018
·
IF 1.372
Hui Wang,Bo Qu,He Liu,Jie Ding,Nanqi Ren
A magnetic solid-phase extraction method for the preconcentration of three organochlorine pesticides (OCPs) from water samples has been proposed, based on magnetic phosphatidylcholine (MPC) as adsorbents. The extraction procedure was carried out in a single step by stirring the mixture of MPC and water samples. Subsequently, the MPC was collected by an external magnetic field without additional centrifugation or filtration. The analytes were desorbed from the MPC and finally analysed by gas chromatography–tandem mass spectrometry. The influence of various parameters on OCPs recoveries was studied. Results show that phosphatidylcholine amount and extraction time were critical in enhancing extraction performance, and the presence of humic acid was shown to significantly reduce the extraction efficiency. The limits of detection obtained were in the range of 0.1–0.15 ng L−1. Recoveries of spiked water samples ranged from 76.2% to 101.5% with relative standard deviations varying from 3.8% to 7.7%. The proposed method was employed for analysis of pentachlorobenzene, α-hexachlorocyclohexane and β-endosulfan in the surface water from two rivers in northeast China.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2018
·
IF 2.196
Dexia Han,Zhengang Zhao,Zhengming Xu,Yuan Li,Pingling Zhang,Xiaoming Guo
β-FeOOH-coupled activated carbon (FAC) was prepared and used to remove bromate from an aqueous phase. SEM, XRD, and FTIR analyses indicated that a larger number of β-FeOOH particles were anchored on the AC surface, which greatly enhanced the bromate adsorption and reduction rates. The influences of the pH, contact time, temperature, and competitive anions on bromate removal by FAC were evaluated. FAC can be used over a wide pH range (3–8) for bromate adsorption and reduction, and competing anions inhibit bromate uptake. The adsorption kinetics agreed well with the pseudo-second-order model (R2 ≥ 0.99), and the adsorption isotherms were well fitted by the Langmuir model. The thermodynamic analysis suggested that bromate removal by FAC was a spontaneous and endothermic process. Bromate was adsorbed and then reduced to bromide; Fe3+ acted as a catalyst to accelerate the reductive reaction. The results of this study indicate that FAC is a stable and promising material for bromate removal.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROPHORESIS
·
2018
·Vol. 39
·期 7
·941-947
·
IF 2.569
Li Zhou,Shenmeng Jiang,Xue Zhang,Linlin Fang,Xingjie Guo
In this paper, β-cyclodextrin (β-CD) modified gold nanoparticles (AuNPs) coated open tubular column (OT column) was prepared for capillary electrochromatography. The open tubular column was constructed through self-assembly of gold nanoparticles on 3-mercaptopropyl-trimethoxysilane (MPTMS) prederivatized capillary and subsequent modification of thiols β-cyclodextrin (SH-β-CD). Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and ultraviolet visible spectroscopy were carried out to characterize the prepared open tubular column and synthesized gold nanoparticles. By comparing different coating times of gold nanoparticles and thiols β-cyclodextrin, we got the optimal conditions for preparing the open tubular column. Also, the separation parameters were optimized including buffer pH, buffer concentration and applied voltage. Separation effectiveness of open tubular column was verified by the separation of four pairs of drug enantiomers including bifonazole, fexofenadine, omeprazole and lansoprazole, and satisfactory separation results were achieved for these analytes studied. In addition, the column showed good stability and repeatability. The relative standard deviation values less than 5% were obtained through intra-day, inter-day, and column-to-column investigations.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 21
·17250-17258
·
IF 3.201
Li Zhou,Bo Zhang,Shuang Li,Jia Yu,Xingjie Guo
A novel enantioselective open-tubular capillary electrochromatography (OT-CEC) technique was developed employing thiol β-cyclodextrin (SH-β-CD) conjugated polydopamine–gold nanoparticles (PDA–AuNPs) as a stationary phase. The capillary inner surface was functionalized with dopamine by self-polymerization under alkaline conditions and the subsequent introduction of gold nanoparticles based on the electrostatic interaction and affinity between gold nanoparticles and amine groups on polydopamine. Then, thiol β-cyclodextrin was introduced on the gold nanoparticle layer through S–Au covalent bonding. The preparation conditions including dopamine concentration, the number of coating layers of gold nanoparticles and thiol β-cyclodextrin concentration were optimized to obtain satisfactory enantioselectivity. Scanning electron microscopy (SEM), energy dispersive X-ray analysis spectroscopy (EDS) and EOF experiments were carried out to characterize the prepared open tubular (OT) column. Then, the separation effectiveness of the open tubular column was verified by the separation of seven chiral drugs including tryptophan, phenylalanine, histidine, fexofenadine, promethazine, tropicamide and terbutaline, and satisfactory separation results were obtained for the analytes studied. Moreover, the stability and repeatability of the column were studied through intra-day, inter-day and column-to-column investigations.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Min Ji,Siqi Niu,Yunchen Du,Bo Song,Ping Xu
Molybdenum carbide materials are considered to be promising hydrogen evolution reaction (HER) electrocatalysts due to their similar electronic structures and catalytic activities to Pt-based catalysts. Here, we report a facile synthesis of β-Mo2C nanoparticles supported on nitrogen-doped carbon nanotubes (Mo2C/N–C) through a one-step carbonization of Mo-containing anion-doped polyaniline nanotubes. It has been revealed that the size of the obtained Mo2C nanoparticles can be effectively tuned by applying different Mo-containing anions. With MoO42– from Na2MoO4, the as-prepared Mo2C/N–C(S) with ultrasmall (2–3 nm) Mo2C nanoparticles shows excellent electrocatalytic HER activity in acidic media, with an overpotential of 189 mV vs reversible hydrogen electrode (RHE) at a geometric current density of −10 mA cm–2 and a Tafel slope of 58 mV dec–1. This study opens up a new avenue for the size-controllable synthesis of transition metal carbide nanoparticles loaded on carbon supports for energy conversion applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Suli Chen,Fan Feng,Yimei Yin,Haiying Che,Xiao-Zhen Liao,Zi-Feng Ma
A star-like hyperbranched β-cyclodextrin is designed and synthesized for the solid polymer electrolyte of all-solid-state sodium batteries by grafting β-cyclodextrin with multiple oligo(methyl methacrylate)- block -oligo(ethylene glycol) methyl ether methacrylate short chains. Complexing this star-like hyperbranched β-cyclodextrin with sodium trifluomethanesulfonate salt leads to a self-standing, transparent, and flexible solid polymer electrolyte film. It is found that this solid polymer electrolyte exhibits superior thermal stability, excellent mechanical properties at the even elevated temperature and good interfacial stability against Na metal electrode. Especially, ascribing to the unique three-dimensional structure of the star-like hyperbranched β-cyclodextrin, a solid polymer electrolyte formed with the optimized star-like hyperbranched β-cyclodextrin containing 69.3 wt.% oligo(ethylene glycol) methyl ether methacrylate shows an ionic conductivity of 1.3 × 10 −4 S cm -1 at 60 °C and a wide electrochemical window of 5.2 V vs. Na + /Na, which are superior to those of the previously reported solid polymer electrolytes. The all-solid-state Na/NaNi 1/3 Fe 1/3 Mn 1/3 O 2 cell shows high first discharge capacity (102.4 mAh g −1 at 0.1C), good reversibility and excellent cycling performance (with 87.8% capacity retention after 80 cycles at 0.1C) at 60 °C. All the results indicate that the star-like hyperbranched β-cyclodextrin is a promising polymer for the solid polymer electrolyte of all-solid-state sodium batteries.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 46
·25941-25948
·
IF 2.936
Shujing Li,Li Yuan,Bing Zhang,Wei Zhou,Xinrui Wang,Dongsheng Bai
The inclusion complexes of trans-polydatin and three cyclodextrins (CDs), namely β-cyclodextrin (β-CD), methyl-β-cyclodextrin (Me-β-CD) and (2-hydroxy) propyl-β-cyclodextrin (HP-β-CD) were prepared. The effects of the inclusion behavior of trans-polydatin with three kinds of CDs were investigated in both solution and the solid state with the following methods: phase-solubility, X-ray diffraction (XRD), thermogravimetric analysis (TG), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM), proton nuclear magnetic resonance (1H-NMR) and two-dimensional rotational frame nuclear overhauser effect spectroscopy (2D ROESY). The results indicated that trans-polydatin formed a 1 : 1 stoichiometric inclusion complex with CDs. Meanwhile, the solubility and thermal stability of the inclusion complexes were improved after encapsulating by CDs. Furthermore, the photostability of trans-polydatin was enhanced after forming the inclusion complexes. The antioxidant activities results showed that the antioxidant performance of the inclusion complexes was enhanced in comparison to the native trans-polydatin. Therefore, it can be a potentially promising way to promote its drug bioavailability or phytochemical preparations.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 42
·8330-8336
·
IF 4.543
Jing Han,Mengfei Zhang,Guojun Chen,Yongqing Zhang,Qing Wei,Ying Zhuo,Gang Xie,Ruo Yuan,Sanping Chen
Here a new type of ferrocene confined in a metal–organic framework (Fc-Zn-MOF) as an electrochemical signal tag has been synthesized and applied in an immunosensor for highly sensitive amyloid-β (Aβ, as a model protein) detection. In the present work, an electrochemically active molecule of Fc was covalently bonded in a Zn-MOF via postsynthetic modification to obtain a flower-like Fc-Zn-MOF, in which the high-content Fc signal units were periodically arranged in a well-defined porous structure, showing enhanced electrochemical activity. As noticed, Fc molecules are chemically anchored on the Zn-MOF, which avoids leakage of signal molecules, protects those electrochemical activities from potential damage and exhibits good stability. The Fc-Zn-MOF signal tag was further explored in constructing an electrochemical immunosensor for Aβ detection, with a linear range from 0.0001 to 100 ng mL−1 and a detection limit of 0.03 pg mL−1, showing improved analytical performance. This work presents an example of an Fc-MOF as a signal tag for Aβ detection, which would encourage atypical research lines for MOFs in bioassays where the introduction of ordered structures promises new opportunities.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2017
·
IF 2.603
Jingyi Zhang,Donghao Liu,Yi Shi,Chen Sun,Muchuan Niu,Ruya Wang,Fan Hu,Deli Xiao,Hua He
In this research, a novel insoluble sorbent based on cyclodextrin and rigid aromatic groups tetrafluoroacetonitrile was designed for dispersive insoluble solid-phase extraction (DSPE). Due to its high adsorption capacity, this obtained polymer was applied to separation and concentration of trace quinolones in wastewater before HPLC determination. Various parameters influencing the extraction performance were studied and optimized. A DSPE approach coupled with high performance liquid chromatography was developed for the determination of four quinolones in wastewater samples. The limit of quantitation of fleroxacin, ciprofloxacin, gatifloxacin, norfloxacin were 2.67, 3.17, 4.75, 5.50 ng mL −1 , respectively. The recoveries of four quinolones range from 96.43 to 103.3% with relative standard deviations less than 4.5%. These results demonstrated that the proposed approach based on CDP was efficient, low-cost for extraction of quinolones from wastewater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 24
·15187-15194
·
IF 3.269
Jing Wu,Yue Xing,Huan Wang,Hongjing Liu,Mei Yang,Jingli Yuan
Although molecular luminescent probes capable of detecting target analytes in an organelle of interest are especially appreciated, lanthanide complex-based organelle-targetable luminescent probes have rarely been developed. Herein, by using an anthryl-substituted terpyridine derivative, 4′-(9-anthryl)-2,2′:6′,2′′-terpyridine (ATPY), as a singlet oxygen (1O2)-recognition ligand, and a diphenyl-containing β-diketone coligand, 6-(1′,1′′-diphenyl-4′-yl)-1,1,1,2,2,3,3-heptafluoro-4,6-hexanedione (DHH), a new β-diketonate–Eu3+ complex-based luminescent probe, Eu(DHH)3(ATPY), has been designed and synthesized for the time-gated luminescence imaging detection of 1O2 in the mitochondria of living cells. The probe showed only weak luminescence due to the quenching effect of the 9-anthryl group. After the specific reaction of the 9-anthryl group with 1O2, the corresponding endoperoxide derivative that exhibited great quantum yield (Φ = 53%), Eu(DHH)3(EP-ATPY), was formed, accompanied by a remarkable luminescence enhancement. The luminescence response behaviors of Eu(DHH)3(ATPY) to 1O2 were investigated using two different 1O2 reaction systems in aqueous media. In addition, the time-gated luminescence imaging study has demonstrated the applicability of the probe for monitoring the 1O2 generation in 5-aminolevulinic acid (a drug for photodynamic therapy) loaded HepG2 cells with high sensitivity and selectivity. Furthermore, by coloading the probe and a mitochondrial indicator, Mito-Tracker Green, into HepG2 cells, the mitochondria-targetable feature of the probe has also been confirmed by confocal luminescence imaging measurements.
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2017
·Vol. 82
·期 9
·1218-1223
·
IF 2.797
Shun Yang,Shiting Lin,Jie Fan,Yaru Wang,Chang Liu,Xiao Yan
Graphical Twice as nice : The porous structure and well-defined cavities of a β-cyclodextrin-decorated polymer were combined with the photoactivity of SnS 2 in a new material for the simultaneous adsorption and photodegradation of organic pollutants. The SnS 2 -modified polymer was derived from nucleophilic aromatic substitution of the hydroxyl groups of both β-CD and SnS 2 -OH by tetrafluoroterephthalonitrile. The discharge of organic pollutants poses a serious threat to public health and the environment. Developing new strategies and materials to remove organic pollutants from water efficiently and completely is of great importance. Herein, a SnS 2 -modified porous β-cyclodextrin-containing polymer (SnS 2 @PCDP), which was derived by nucleophilic aromatic substitution of the hydroxyl groups of both β-CD and SnS 2 −OH by tetrafluoroterephthalonitrile, was prepared for the rapid, complete removal of organic pollutants from water . The porous structure and well-defined cavities of β-CD endow SnS 2 @PCDP with a facile and high adsorption capacity, and the modification with SnS 2 leads to simultaneous adsorption and photodegradation processes for the rapid and complete removal of organic pollutants. In addition, SnS 2 @PCDP can be regenerated several times using light irradiation with no loss in performance. Overall, the efficient removal performance and excellent reusability indicate that SnS 2 @PCDP has potential for practical applications in the efficient treatment of organic pollutants.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Qing Gao,Jiabao Zheng,Paul Van der Meeren,Bin Zhang,Xiong Fu,Qiang Huang
Cyclodextrins (CD) are well known to form host-guest assemblies with hydrophobic compounds. As a structural homologue, starch-guest inclusion complexes (ICs) have become promising in the food, agriculture , and pharmaceutical industries due to their low cost and versatility. This study compared the stabilizing and releasing abilities for thymol of three kinds of pre-formed V-type starch (Water-V, Salt-V, and Alkali-V) and β-CD. The loading efficiency for thymol decreased in the order of Water-V > Alkali-V > CD > Salt-V when removing the free thymol. Water-V, β-CD, and their ICs had better thermal stability with maximum thermal decomposition temperatures over 320 °C. Under non-cold chain daily storage conditions for 4 d, the percentage of thymol released from starch/CD-thymol ICs was 14% (Water-V), 35% (Salt-V), 34% (Alkali-V), and 43% (CD). The Water-V made ICs had good sustained release properties and long-term antibacterial activity , which kept strawberries fresh for 6 d without decay.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）