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.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2015
·Vol. 407
·期 6
·1735-1744
·
IF 3.436
Xie Xiaoyu,Pan Xiaoyan,Han Shengli,Wang Sicen
Analyses of four endocrine disrupting chemicals (EDCs) in water and milk samples were undertaken by using magnetic molecularly imprinted polymers (MMIPs). These were prepared via the surface molecular imprinting technique using super paramagnetic core-shell nanoparticle as support. Diethylstilbestrol (DES), which is a typical EDC, was employed as the template molecule. The obtained MMIPs were characterized using transmission electron microscope, Fourier transform infrared, X-ray diffraction, and vibrating sample magnetometer. Accordingly, the adsorption capacity and selectivity of prepared MMIPs were investigated. The binding isotherms were obtained for DES and fitted by the Freundlich isotherm model. A corresponding analytical method to determine four EDCs was developed. The recoveries of the spiked samples in pond water and pure milk range from 67.8 to 93.2 % and from 65.3 to 92.5 %, respectively. Coupled with high-performance liquid chromatography analysis, the prepared MMIPs were successfully applied to the analysis of EDCs in water and milk samples.
The construction and feature of magnetic molecularly imprinted polymers
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2015
·
IF 3.545
Ganghui Chu,Wensheng Cai,Xueguang Shao
Ring-opening reaction with synchronous hydrolysis was used to prepare 4-butylaniline-modified attapulgite (abbreviated as BA-ATP) for pre-concentration of bisphenol A (BPA) in trace quantity. The preparation was achieved under mild condition, and the material was characterized by Fourier transform infrared spectroscopy (FT-IR), elemental analysis , nuclear magnetic resonance (NMR) and scanning electron microscopy. BA-ATP was used in solid phase extraction (SPE), and SPE was performed in a neutral condition without regard to ionic strength . The results indicate that BA-ATP has high affinity to BPA with a maximum adsorption amount of 44 mg g −1 , and the adsorption can be described by Langmuir isotherm model. The content of bisphenol A in water samples was analyzed by HPLC method with the pre-concentration using BA-ATP. The limit of detection (LOD) can be as low as 3.9 ng mL −1 , and the average recoveries are in a range of 93–97% with relative standard deviation (RSD) of less than 2%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Beibei Chen,Yunlin Huang,Man He,Bin Hu
A new method of hollow fiber liquid-liquid-liquid microextraction (HF-LLLME) combined with high performance liquid chromatography-ultraviolet detection (HPLC-UV) was developed for simultaneous analysis of various environmental estrogens. Taking eight environmental estrogens (17β-estradiol (E2), estrone (E1), estriol (E3), 17α-ethynylestradiol (EE), diethylstilbestrol (DES), dienestrol (DIS), bisphenol-A (BPA) and 4-t-octylphenol (OP)) as the target analytes, the factors affecting HF-LLLME-HPLC-UV were investigated in detail. Under the optimized experimental conditions, the extraction efficiency of HF-LLLME for eight target estrogens was in the range of 13.9–62.8%, and the enrichment factor was 88–376-fold. The limits of detection (LODs) of the proposed method for eight target estrogens of ES, BPA, E2, EE, E1, DES, DIS and OP were 0.11, 0.055, 0.66, 0.55, 0.51, 0.20, 0.11 and 1.46 ng/mL, respectively, which are lower than that obtained by some other sample pretreatment methods followed by HPLC-UV analysis. The relative standard deviations of the method (RSDs, c E3, BPA, DIS =5 ng/mL, c E1, E2, EE, OP = 40 ng/mL, c DES = 15 ng/mL, n = 7) are in the range of 5.5–8.4%. The developed method was applied for the determination of environmental estrogens in environmental and biological samples (sediment and fish), and none of the eight target estrogens was detected. The recoveries for the spiking samples with low, medium and high spiking levels were in the range of 73.2–117.5%. The proposed method has been demonstrated to be suitable for simultaneous determination of multiple environmental estrogens with high sensitivity, high enrichment factors, good sample clean-up ability and no derivatization required.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2013
·Vol. 92
·期 4
·720-728
·
IF 1.003
Qingjie Xie,Linzi Li,JianMing Pan,Minjia Meng,Zhilong Song,Wenjing Zhu,Bing Wang,Ping Yu
Molecularly imprinted β-cyclodextrin/Kaoline particles (MIPs) were prepared for recognitive adsorption of bisphenol A (BPA) from aqueous solution. The characterisation of MIPs were achieved by FTIR spectra, SEM micrographs, nitrogen adsorption–desorption analysis and elemental analysis. The equilibrium data, at various temperatures, were described by the Langmuir, Freundlich and Dubinin-Radushkevich isotherm models. The kinetic properties were successfully investigated by pseudo-first-order model, pseudo-second-order model, intraparticle diffusion equation, initial adsorption rate and half-adsorption time. Based on the comparison of diffusion parameters, including intraparticle diffusion, film diffusion and pore diffusion, we can confirm the process of recognitive binging sites in MIPs. A diffusion-controlled process as the essential adsorption rate-controlling step was proposed. Moreover, intraparticle diffusion increased with BPA concentration while film and pore diffusion decreased. An increase in the temperature was found to increase intraparticle and pore diffusion, and reduce film diffusion. The selectivity of MIPs also demonstrated higher affinity for target BPA over competitive phenolic compounds than that of non-imprinted polymers (NIPs).
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2013
·Vol. 5
·期 19
·5037-5043
·
IF 1.855
Yingtang Li,Yang Jiao,Yuhong Guo,Yaling Yang
A new and fast microextraction technique termed vortex-assisted supramolecular solvent microextraction (VASUSME) has been developed. The method was based on the microextraction of endocrine disrupting compounds (EDCs), including bisphenol-A (BPA), 2,4-dichlorophenol (2,4-DCP), bisphenol-AF (BPAF) and tetrabromobisphenol-A (TBBPA) in 10 mL sample with 500 μL of a supramolecular solvent (SUPRASs), and then detection by high-performance liquid chromatography (HPLC). In the VASUSME procedure, dispersion of microvolumes of a low density extraction solvent into the aqueous sample is achieved by vortex mixing, a mild emulsification procedure. Under the optimum conditions, the repeatability of the proposed method was found to be good. The relative standard deviations (RSD, n = 5) were 3.98–5.64%. The limits of detection (LOD) were in the range of 0.14–0.32 ng mL−1 and the limits of quantification (LOQ) were in the range of 0.41–1.02 ng mL−1. All correlation coefficients of the calibration curves were higher than 0.998. Recoveries of the EDCs spiked into samples of liquid foods and their packaging materials were in the range of 91% to 105.1%. The VASSUSME method was successfully applied to the analysis of BPA, 2,4-DCP, BPAF and TBBPA in samples of liquid foods and their packaging materials. Moreover, the method is simple, sensitive and environmentally-friendly and consumes much less solvent than traditional methods.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2013
·
IF 0.965
Jiangping Cao,Shuhui Liu,Weiwei Bai,Jie Chen,Qilong Xie
A novel method for the determination of the migration of bisphenol A (BPA) from polycarbonate water bottles has been developed by using dispersive liquid–liquid microextraction (DLLME) followed by high performance liquid chromatography for compliance with the regulatory specific migration limit. Experimental parameters, including the type and volume of extractants and dispersers, the sample solution pH, addition of salt, extraction time, and temperature, were examined and optimized. Under the optimum conditions, average recovery rates for the real samples varied from 82% to 98%, with relative standard deviation values less than 3.6%. The method offered excellent linearity over a range of 0.8–600 µg L−1 with a correlation coefficient of r = 0.9999. Intra-day and inter-day repeatability values expressed as relative standard deviation were 3.9% and 6.9%, respectively. The method quantitation limit and detection limit were 0.7 and 0.2 µg L−1, respectively. The developed method was successfully applied to the determination of the migration of bisphenol A from 26 polycarbonate water bottles collected locally. The findings indicated the migration from the used bottles was significantly higher than the new ones, and the migration amounts from one sample was very close to the regulatory specific migration limit, and the amounts from seven samples exceeded the daily intake limit for infants.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2013
·
IF 2.894
Heng Lin,Jie Wu,Hui Zhang
The removal of bisphenol A (BPA) by a novel “electro/Fe 3+ /peroxydisulfate” process is reported in this study. The effects of initial pH, electrolyte concentration, Fe 3+ concentration, peroxydisulfate (PDS) concentration and current density were investigated. The results indicated that the removal efficiency of BPA declined with the increase of initial pH and electrolyte concentration, but increased with an increase of Fe 3+ concentration and current density. The BPA degradation efficiency was improved significantly when the PDS concentration was increased from 1 to 10 mM, but further PDS increase had little effect. BPA was almost completely removed after 60 min reaction and a TOC removal efficiency of 94.3% was achieved when the reaction time was extended to 120 min.
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 24
·10170-10176
·
IF 1.821
Chunpeng Diao,Xiao Yang,Ailing Sun,Renmin Liu
Magnetic matrix solid phase dispersion (MMSPD) assisted dispersive liquid–liquid microextraction (DLLME) for the ultrasensitive determination of bisphenol A (BPA) in environmental water was developed with high performance liquid chromatography-fluorescence (HPLC-FLU) detection. Microparticles of magnetic activated carbon (MAC) were synthesized and used to conduct the MMSPD procedure. The specific surface area of the MAC was 287 m2 g−1, and the saturation magnetization of the MAC supported by Fe3O4 nanoparticles was up to 20.7 emu g−1. BPA in water was adsorbed by microparticles of MAC and then transferred into the elution solvent by elution. The DLLME procedure was assisted by the elution solvent acting as the dispersive solvent. BPA in the elute solvent of the MMSPD procedure was concentrated into the trace volume extraction solvent of the DLLME procedure. A sufficiently low limit of detection (LOD) of 0.002 μg L−1 for the determination of BPA in environmental water was obtained. Good linearity was obtained throughout the concentration range of 0.006 to 5.0 μg L−1 with a correlation coefficient (R2) of 0.9991. The relative standard deviation (RSD) was 6.2%. The relative recoveries ranged from 86.6 to 106.3% for the spiked real water samples. The results showed that the MMSPD assisted DLLME technique is highly sensitive and reliable for the determination of trace BPA in environmental water.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2015
·
IF 4.529
Zailin Gong,Shujin Li,Jun Ma,Xiangdong Zhang
The commercial powdered activated carbon (PAC) has been selectively oxidized by two methods. The two oxidized methods are wet oxidation with ammonium persulfate and thermal treatment after acidification with hydrochloride acid, respectively. The two oxidized PAC were then functionalized with thermoresponsive poly ( N -isopropylacrylamide) (PNIPAM) in aqueous solution at ambient temperature. Comparing the two oxidized PAC products and their grafted derivatives, the oxidized PAC modified with thermal treatment after acidification shows larger surface area of 1184 m 2 /g and better adsorption of bisphenol A. Its derivative also exhibits relatively large surface area and adsorption capacity after grafted with PNIPAM. The maximum surface adsorption capacity simulated under Langmuir Models reached 156 mg/g. In addition, the grafted PAC products show self-flocculation behaviors with rapid response to temperature because of the thermal phase transition and entanglement behaviors of PNIPAM. The present study provides a new way to obtain carboxyl-rich activated carbon with large surface area and better adsorption capacity. The retrievable grafted PAC with good self-flocculation effect responsive to temperature will have high potential application in water remediation which requires pre-heating and emergency water treatment in the wild.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Jiangkun Du,Jianguo Bao,Xiaoyan Fu,Chenghang Lu,Sang Hoon Kim
A mesoporous sulfur-modified iron oxide (MS-Fe) was prepared as a heterogeneous H 2 O 2 catalyst for degradation of BPA. The physico-chemical properties of MS-Fe and bare M-Fe were characterized by BET surface area measurement, SEM, XRD, FTIR and XPS. Both M-Fe and MS-Fe composites appeared as cubic microparticles with abundant pores and cracks as well as large surface area. As depicted by XRD, EDX and XPS, M-Fe is mainly consisted of hematite while MS-Fe is a kind of S-doped iron oxide with about 5–6% of sulfur element in terms of atomic ratio. In contrast to the poor catalytic activity of bare M-Fe, the MS-Fe composites showed greatly improved efficiencies for H 2 O 2 activation for BPA degradation. The high catalytic activity of this new Fenton-like catalyst can be obtained at different initial pH in range of 3.0–9.0. The time evolution of degradation of BPA followed pseudo-first-order kinetics, and the first-order rate constants showed a linear relationship with parameters of initial pH, catalyst dosage and concentration of BPA. However, the H 2 O 2 dosage showed a dual effect on BPA degradation because excessive H 2 O 2 addition lead to scavenging of hydroxyl radicals ( OH). The investigation of working mechanisms of MS-Fe suggested a synergistic effect of homogeneous and heterogeneous degradation reaction, wherein a strong acidic environment, abundant surface-bonded hydroxyl group and electron-mediating effect of sulfur all contributed to fast activation of H 2 O 2 . Overall, this new material overcomes the limitation of narrow working pH range and shows a fast oxidation of BPA with a low H 2 O 2 and catalyst dosage, would have a good potential for environmental application.
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 9
·7239-7248
·
IF 3.289
Lizi Huang,Mingyan Liao,Xin Yang,Hao Gong,Liang Ma,Yudan Zhao,Kun Huang
Bisphenols (BPs) are a group of chemicals with two hydroxyphenyl functionalities. BPs analogues including bisphenol A (BPA), bisphenol B (BPB), bisphenol F (BPF), bisphenol S (BPS), bisphenol AF (BPAF), bisphenol AP (BPAP), tetrabromobisphenol A (TBBPA) and tetrachlorobisphenol A (TCBPA) are widely used in the production of plastic materials. There has been a growing concern worldwide about environmental BPs exposure due to their potential adverse effects on human health. Deposition of β-cell toxic misfolded human islet amyloid polypeptide (hIAPP), a hormone biosynthesized and secreted by the pancreatic β-cells, is a cardinal finding in type 2 diabetes mellitus (T2DM). Epidemiological studies suggest BPA exposure is positively associated with the incidence of T2DM, which may be due to the exacerbated toxic aggregation of hIAPP induced by BPA as we previously reported. Here, we demonstrate that bisphenol analogues showed different effects on hIAPP amyloid formation. Unlike the accelerating effects of BPA, four BPs analogues (BPAF, BPAP, TBBPA and TCBPA) showed inhibitory effects on hIAPP aggregation and decreased the membrane disruption capacity of hIAPP. Our results also explained a possible relationship between the spatial structure and the inhibitory capacities of BPs analogues.
✓ 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）