JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 327
·期 1
·175-188
·
IF 1.137
Luo Jiaqi,Xu Yuli,Zhu Qiqi,Zhang Kang,Chen Fang,Yu Xiuwu,Huang Zhao,Xiao Fangzhu,Peng Guowen
A novel adsorbent magnetic functionalized m-carboxyphenyl azo calix[4]arene symmetrical sulfide derivative (Fe 3 O 4 /M-CCSSD) was fabricated by a series of simple reactions and characterized by FT-IR and SEM. The effects on U (VI) adsorption process were investigated at several conditions. The calculated data disclose that the adsorption process of U (VI) by Fe 3 O 4 /M-CCSSD is an endothermic spontaneous process, which well fits with the pseudo-second-order kinetic and Freundlich isotherm model. In the most favorable conditions, accounting for approximately 89% of U (VI) was removed. In addition, Fe 3 O 4 /M-CCSSD showed high selectivity for U (VI) and exceptional reusability.
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FOOD CHEMISTRY
·
2020
·
IF 6.306
Jiankun Cao,Sihui Liang,Hao Zhang,Qian Xu,Wenliang Ji
In this work, sodium 4-styrenesulfonate functionalized polyacrylonitrile nanofibers mat (SS/PAN NFM) was firstly prepared and applied as 96-well plate solid–phase extraction adsorbent for quantitative determination of seven β-agonists residues in pork samples. The functional modification endowed the SS/PAN NFM with superior adsorption performance for target β-agonists. The adsorption process is spontaneous (Δ G < 0), the initial adsorption rate can reach 6.03–9.09 mg/g/min and the maximum adsorption capacity is calculated to be 48.3 mg/g at 298 K. Moreover, SS/PAN NFM can be reused for 12 times without degradation in adsorption capability. Combined with UPLC–MS/MS, the limits of detection can reach 0.006–0.24 μg/kg, the recoveries ranged from 87.2% to 111% and the relative standard deviations of intra-day and inter-day precisions were in the scope of 1.75%–11.6% and 5.08%–13.5%, respectively. The obtained results fully demonstrated the practicability of this method in preventing the hazard of β-agonists residues.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 42
·22065-22074
·
IF 11.301
Hongling Guo,Gang Wang,Rutao Meng,Yali Sun,Siyu Wang,Shengli Zhang,Jianyu Wu,Li Wu,Guangxing Liang,Hui Li,Yi Zhang
A Li+-doping strategy is a promising route for achieving highly efficient Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic devices with a large grain absorber layer, high p-type carrier concentration and good band alignment at the Cu2ZnSn(S,Se)4/CdS interface. However, Li+-doped CZTSSe solar cells based on in situ and pre-deposition doping strategies reported thus far generally suffer from massive lithium losses and sodium rejection due to the soda-lime glass substrate. Therefore, simultaneously fulfilling the goals of simple and efficient Li+-doping remains a major technical challenge, which may be addressed, as we demonstrate here, with the development of a Se&LiF co-selenization process. By engineering the band alignment of the Cu2ZnSn(S,Se)4/CdS interface through the Se&LiF co-selenization process, an encouraging efficiency of 11.63% with an open-circuit voltage deficit of 0.583 V has been reached. Furthermore, the crystallinity of the absorber layer and the distribution of copper are improved, and a more copper-poor CZTSSe surface is formed. This novel Li+-doping strategy introduces a new approach towards the goal of high-performance CZTSSe solar cells compatible with a simple manufacturing process and excellent performance.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Shengnan Wei,Xuechen Wang,Bo Pang,Hang Li,Xuening Shi,Chao Zhao,Juan Li,Juan Wang
A simple, fast, one-step method is described for ratiometric colorimetric detection of ascorbic acid (AA) based on 4-mercaptophenylboronic acid (4-MPBA) and silver nanoparticles (AgNPs). In the presence of AA, the aggregation process of AgNPs can be triggered and accelerated, due to the interaction between 4-MPBA and the cis 1,2-diol moieties of AA through a reversible esterification, resulting in a distinguish color change from yellow to brownish red. The AA concentration-dependent color change can be quantified by the bare eyes or a UV–Vis spectrometer. The whole AA detection procedure was able to complete in 10 min with an excellent linear relationship (1–500 μM) and a low limit of detection (0.70 μM). The proposed approach was also used to accurately evaluate AA levels in orange juice. In our perception, this assay is rapid, sensitive, and specific, which demonstrates its potential on constructing biochemical and clinical sensors.
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Nano Energy
·
2019
·
IF 15.548
Chong Chen,Fumin Li,Liangxin Zhu,Zhitao Shen,Yujuan Weng,Qiang Lou,Furui Tan,Gentian Yue,Qingsong Huang,Mingtai Wang
The defects in perovskite crystals and the penetration of moisture/oxygen into the perovskite layer are major problems for perovskite solar cells (PSCs) to achieve long-term stability and high power conversion efficiency (PCE). However, there is still a lack of multifunctional passivation materials to solve these problems. Herein, for the first time, we report oleyl amine-coated PbSO 4 (PbO) 4 quantum-dots (QDs), as a passivation material with dual functions to simultaneously passivate the surface defects and block the penetration of moisture/oxygen into the perovskite layer for stable and efficient PSCs. The PbSO 4 (PbO) 4 QDs significantly reduce the defect density of the as-prepared CH 3 NH 3 PbI 3 films by passivating under-coordinated Pb ions and I anions and effectively enhance charge extraction efficiency at the TiO 2 /CH 3 NH 3 PbI 3 and CH 3 NH 3 PbI 3 /spiro-OMeTAD interfaces. Moreover, the hydrogen bond between H atoms of the OA and I atoms of the perovskite and the interface electric field at CH 3 NH 3 PbI 3 /OA interface also contribute to the improvement of efficiency and stability of PSCs. Finally, higher PCE (20.02%) is achieved by the PSCs with OA-coated PbSO 4 (PbO) 4 QDs compared to that (16.86%) of the PSCs without OA-coated PbSO 4 (PbO) 4 , corresponding to a 18.7% enhancement. Moreover, the PSCs with OA-coated PbSO 4 (PbO) 4 QDs maintain 90% of initial efficiency after operation for 280 h, indicating better stability than the PSCs without PbSO 4 (PbO) 4 QDs.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 8
·1-8
·
IF 5.479
Chen Ya-Shun,Xiao Hua-Ming,Wang Tian-Qi,Yu Lei,Feng Yu-Qi
A MALDI-TOF mass spectrometric method is described for the determination
of small molecule compounds with cis-diol. It is based on the use of a binary matrix
consisting of boron nitride (BN) and α-cyano-4-hydroxycinnamic acid that was
modified with the derivatization reagent of (3-(acridin-9-ylamino)phenyl)boronic
acid which can recognize cis-diols. The binary matrix is used for
desorption/ionization (DI) in the positive ion mode. The mechanism leading to DI
enhancement was investigated. The results imply that BN is beneficial for the DI
because it induces an enhancement in the positive ion mode. The boronic
acid-functionalized binary matrix was successfully applied to capture the glucose,
shikimic acid and quinic acid. The method was applied to the determination of
3-chloro-1,2-propanediol in plant oil.
Schematic representation of a method for detecting the
cis-diol compounds on matrix assisted laser desorption/ionization
time-of-flight mass spectrometry (MALDI-TOF MS) using the binary
matrix of boron nitride (BN)/α-cyano-4-hydroxycinnamic acid (CHCA)
that was modified with (3-(acridin-9-ylamino)phenyl) boronic acid
(AYPBA).
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PHYSICS AND CHEMISTRY OF LIQUIDS
·
2019
·
IF 1.526
Mengsha Cai,Zhaoshan Liu,Haiyun Sun,Yongsheng Guo,Wenjun Fang
Densities (ρ) and viscosities (η) of a ternary system cyclopropanemethanol (1) + 2,2,4-trimethylpentane (2) + decalin (3) and three corresponding binary systems were measured at temperatures from 293.15 K to 323.15 K and atmospheric pressure. Densities were obtained by using a vibrating-tube densimeter. Viscosities were determined by an automatic microviscometer based on the rolling ball principle. The excess molar volumes (VmE) and viscosity deviations (Δη) of the ternary system were derived from the experimental data and then were fitted to Clibuka, Nagata–Tamura and Redlich–Kister equation, respectively. The binary subsystems were correlated by Redlich–Kister equation. The values of VmE and Δη were used to discuss the nature of mixing behaviours between mixture components.
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ENVIRONMENTAL POLLUTION
·
2018
·
IF 4.358
Chen Wang,Jing An,Yingchen Bai,Hui Li,Haibo Chen,Dong Ou,Yongdi Liu
Tris(1,3-dichloro-2-propyl) phosphate (TDCPP) has been frequently detected in environmental media and biological samples. However, knowledge of its adverse health consequences is limited. In the current study, Caenorhabditis elegans ( C. elegans , L1 larvae) were exposed to TDCPP at environmentally relevant concentrations (control, 0.1, 1, 100 and 1000 μg L −1 ) for 72 h to explore any association between TDCPP and the aging process. Some of the degenerative age-related indicators were observed, including locomotion behaviors and lifespan. As crucial biomarkers of aging, the accumulation of lipofuscin, and lipid peroxidation (LPO) products exemplified by 4-hydroxynon-2-enal (4-HNE) were detected. This product forms as a result of oxidative stress , as confirmed by an N-acetyl-L-cysteine (NAC) pharmacological assay. Moreover, a significant increase in reactive oxide species (ROS) production in a dose-dependent manner using a fluorescent probe was observed. For the underlying molecular mechanism of the above aging phenotypes, significantly upregulated transcription of genes related to antioxidant systems, especially a subset of glutathione S-transferase ( gst-5, gst-6, gst-9, gst-10, gst-19, gst-24, gst-26, gst-29, gst-33, and gst-38 ), was found by RNA-Seq and further confirmed by RT-qPCR. The elevated glutathione S-transferase (GST) was attributed to the significant increase in 4-HNE because mutations in gst-5 and gst-24 inhibited the conjugation of GSTs with 4-HNE. Therefore, GST play an indispensable role in the detoxification process of TDCPP exposure and further confirmed LPO accumulation at the molecular mechanism level. In conclusion, TDCPP accelerated the aging process induced by the LPO products, 4-HNE, response to reactive oxidative species in C. elegans .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Jing Chen,Yunjing Gao,Qin Ma,Xiaoyan Hu,Yali Xu,Xiaoquan Lu
In the present work, the classical synthesis method of 5,10,15,20-(4-sulphonatophenyl) porphyrin (TPPS 4 ) was improved. The synthesis process became more environmentally friendly, and the yield was increased by 10%. We constructed a sensitive fluorescent sensor for detection hydrogen peroxide (H 2 O 2 ) and glucose (C 6 H 12 O 6 ) by using the hyperfluorescence of TPPS 4 . The TPPS 4 -Fe 3+ complex system of the sensor could generate electron transfer process (ET) in the process of hydrogen peroxide (H 2 O 2 ) and glucose oxidation, which quenched the TPPS 4 fluorescence. The system had a linear range of 0–42 μM for hydrogen peroxide, and the minimum detectable limit (LOD) was 1.24 nM (S/N = 3). Compared with other detection methods, the proposed method had the advantages of higher sensitivity, lower detection limit and more simple operation.
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Analytical Methods
·
2015
·Vol. 7
·期 10
·4246-4251
·
IF 1.821
Pinong Huang,Suqing Zhao,Sergei A. Eremin,Shengwu Zheng,Dan Lai,Yingshan Chen,Bin Guo
Based on a sensitive monoclonal antibody against bisphenol A (BPA) and a new tracer named BVA–AMF, a homogeneous fluorescence polarization immunoassay (FPIA) was developed and applied in the determination of bisphenol A in environmental water samples. BVA was selected as the hapten to couple with bovine serum albumin and the conjugate was used as the immunogen for the monoclonal antibody production. Three fluorescein-labeled BVA tracers with different structures (BVA–AMF, BVA–EDF, and BVA–lysFITC) were synthesized. Under the same optimal conditions, BVA–AMF showed the highest sensitivity for FPIA and the detection of BPA exhibited a limit of detection of 5.60 ng mL−1, an IC50 of 140 ng mL−1 and a dynamic range of 11.32–904.21 ng mL−1 approximately. In this assay, several similar compounds were shown of little significantly with the cross-reactivity being less than 0.15%. Four different kinds of water samples were analyzed, with recoveries being 87.91–114.28%. The detection standard curve of BPA exhibited a good linearity (R2 = 0.9913, n = 3). Compared with ELISA and HPLC methods, FPIA showed reliability and a high correlation with ELISA of 0.9964 and HPLC of 0.9971. The proposed immunoassay technique is suitable for detection of BPA in authentic environmental water samples.
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ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Kao Zhu,Xianyun Hu,Qinyu Ge,Qingjiang Sun
We have developed a new fluorescent probe of thioglycolic acid (TGA)-capped CdTe quantum dots (QDs) complexed with a model drug, meso -tetrakis( N -methylpyridinium-4-yl)porphyrin (TMPyP) for detecting deoxyribonucleic acids (DNAs). This probe operates with an “Off–On” mode: TMPyP quenches the photoluminescence (PL) of QDs via a photo induced electron-transfer (PIET) process; the presence of DNA can break the QD/TMPyP complexation, interrupting the PIET process, and switch on the PL of QDs. Sensitive detection of DNA with the detection limit of 0.16 nM and a linear detection range of 0.25–6.0 nM are achieved. Importantly, this probe can be used to distinguish the binding modes of DNA–TMPyP interactions, exhibiting the DNA sequence-dependent PL recovery behaviors. The obtained binding constant for poly(dA)·poly(dT) is ∼3.30 × 10 7 L mol −1 , which is approximately one order of magnitude larger than those for native DNAs and poly(dG)·poly(dC). Furthermore, the thymine bases preferential of the TMPyP–DNA interaction is proved by this probe.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 24
·期 3
·582-590
·
IF 1.174
Li Xin,Bi Cai-Feng,Fan Yu-Hua,Zhang Xia,Zhang Nan,Yan Xing-Chen
A novel transition metal coordination polymer [Co 3 (C 14 H 8 NO 4 Cl) 4 (CH 3 OH) 4 ·4CH 3 OH] n with Schiff base (C 14 H 8 NO 4 Cl: 4-chloroanthranilic acid- 2,4-dihydroxybenzaldehyde) was synthesized using 4-chloroanthranilic acid, 2,4-dihydroxybenzaldehyde and cobalt(II) acetate as source, and its structure was characterized by IR spectroscopy, elemental analysis, 1 H NMR and single crystal X-ray diffraction. X-ray crystallography shows that every cobalt atom is six-coordinated. Two cobalt atoms on the two sides are respective coordinated with two nitrogen atoms from –C=N–, two carboxylic oxygen atoms and two hydroxyl oxygen atoms in different ligands, while the cobalt atom in the middle links two ligands on the side through two carboxylic oxygen atoms and coordinates with four oxygen atoms of methanol, forming a three-nuclear Co(II) complex. The complex forms a two-dimensional layer structure through O–H···O intermolecular hydrogen bonds. The interaction of the Co(II) complex with calf-thymus DNA (CT-DNA) was investigated by UV absorption spectroscopy, fluorescence emission spectroscopy, viscosity and cyclic voltammetry. All measurements revealed that the Co(II) complex binds to DNA via a intercalative mode.
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