Food Analytical Methods
·
2020
·Vol. 13
·期 3
·811-822
·
IF 2.667
Cheng Fuliang,Liao Xiaoning,Huang Zhiwen,Xu Liting,Zhou Ying,Zhang Xue
Thiabendazole (TBZ), a widely used agricultural antifungal, has been evidenced to pose serious threat to human health. However, highly sensitive detection of it in food samples is difficult owing to the complexity of food matrix. Herein, an electrochemical sensor, based on multiwall carbon nanotubes (MWCNTs) decorated two-dimensional layered molybdenum disulfide (MoS 2 ), was firstly developed for rapid detection of TBZ using square wave voltammetry method. It is demonstrated that the modification of MoS 2 with MWCNTs enhances the catalytic performance to TBZ oxidation. Under optimized conditions, the electrochemical sensor shows admirable linearity range, high selectivity and low detection limit. In pear, water spinach and tap water sample analyses, satisfactory recoveries from 92.83 to 101.92% with coefficients of variation less than 5% were obtained, showing high consistence with the HPLC results. This work puts forward a rapid and reliable method for the highly sensitive screening of the residues of TBZ in food resource.
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International Journal of Peptide Research and Therapeutics
·
2019
·Vol. 26
·期 4
·1991-1999
·
IF 1.219
Cao Mengjie,Lu Kui,Liu Guangbin,Zhao Dongxin,Qi Jianzhao
Affecting the repair function of RAD51 can effectively reverse tumor resistance to chemotherapy and radiotherapy. There is interaction between RAD51 181−200 and BRCA1 846−871 . Using the computer to simulate single mutation of lysine at 862 position of BRCA1 846−871 , six BRCA1 846−871 mutants with significant interaction with RAD51 181−200 were screened out. These mutant peptides were obtained by 9-fluorenylmethyloxycarbonyl (Fmoc) solid-phase peptide synthesis (SPPS) method. All peptides were purified and characterized by liquid chromatography and ESI-MS. In this study, the interaction between RAD51 181−200 and BRCA1 846−871 or mutant peptides was investigated using circular dichroism spectroscopy (CD) and fluorescence spectroscopy. The CD results shown that the secondary structure change of RAD51 181−200 induced by BRCA1 846−871 , BRCA1 846−871 K862F ( F ), BRCA1 846−871 K862G ( G ), BRCA1 846−871 K862E ( E ) and BRCA1 846−871 K862N ( N ) was obvious, which the α-helix content of RAD51 181−200 decreased from 58.3–36.1%, 58.3–36.2%, 58.3–36.4%, 58.3–36.5% and 58.3–36.0%, respectively. While, the addition of BRCA1 846−871 K862P ( P ) and BRCA1 846−871 K862Y ( Y ) hardly changed the α-helix content of RAD51 181−200 . From the fluorescence results, the binding constants of F and Y are 1.00 × 10 5 M −1 and 1.16 × 10 5 M −1 respectively, which were both larger than that of BRCA1 846−871 (9.01 × 10 2 M −1 ). The binding constant of RAD51 181−200 with E (7.45 × 10 3 M −1 ) is slightly higher than that of BRCA1 846−871 . The binding constants of RAD51 181−200 with P (1.24 × 10 3 M −1 ) and N (1.26 × 10 3 M −1 ) are similar to that of BRCA1 846−871 . However, the K b value of G (1.51 × 10 2 M −1 ) is less than that of BRCA1 846−871 . Comparing all spectral data, F is the most significant one interacting with RAD51 181−200 . These findings could provide direction for peptide processing and application.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 1
·226-238
·
IF 2.195
Shen Yongqian,Wei Yupeng,Li Jian,Zhang Yuchen,Li Bin,Lu Xuefeng,Ji Binghan,Yan Pengze,Du Xueyan
Electromagnetic (EM) wave absorbing materials with superhydrophobic property and enhanced microwave absorbing ability are very important for the application of stealth technologies, especially in humid conditions. In the present work, the electrospinning technique was employed to fabricate NiAc/PVA nanofibers (NFs) from nickel acetate tetrahydrate (NiAc) and poly(vinyl alcohol) (PVA) solution as precursors, while the PVA component was further pyrolyzed and carbonized to obtain Ni/NiO/C NFs. Microwave absorption performance and EM parameters of the prepared NFs were then investigated from 2.0 to 18.0 GHz. Comparative studies between different samples elucidated not only the possible causes for lose mechanisms, but also impedance matching. According to the experimental results, when NiAc/PVA NFs contained 8% NiAc, the calcinated Ni/NiO/C NFs could achieve an optimum reflection loss of − 33.9 dB at 10.4 GHz under a thickness of 2.5 mm and exhibit an effective frequency bandwidth of 5.7 GHz. Furthermore, the membrane of Ni/NiO/C NFs with the best absorption property exhibited robust hydrophobicity and the contact angle was 144.9°, It shows that the obtained Ni/NiO/C NFs have a broad application prospect in waterproof stealth materials.
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Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Xu Haowen,Zhang Heyi,Ma Yuhui,Jiang Mao,Zhang Yewei,Wu Yinan,Zhang Haoran,Xia Ruidong,Niu Qiaoli,Li Xing’ao,Huang Wei
The morphology of perovskite light-absorption layer plays an important role in the performance of perovskite solar cells (PSCs). In this work, BiFeO 3 (BFO) nanostructures were used as additive for CH 3 NH 3 PbI 3 (MAPbI 3 ) via anti-solvent method. The addition of BFO nanostructures greatly enhanced the crystallinity, grain size and film uniformity of MAPbI 3 . As a result, the charge carrier mobility and electron diffusion length increased, leading to the increase of the short circuit current (J SC ) of PSCs. This work provides a very simple but effective approach to improve the morphology of perovskite layer for efficient PSCs.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 11
·1-8
·
IF 2.009
Cao Sheng,Dai Chencheng,Zhao Jialong,Zou Bingsuo
In this work, a facile approach to synthesize the Ag- and Mn-codoped Zn-In-S nanocrystals (NCs) with dual emissions as ratiometric temperature sensors is reported. The as-synthesized codoped Zn-In-S NCs have a uniform size distribution and exhibit a zinc blende ZnS phase structure. Moreover, the as-produced codoped NCs show dual emission peaks which center at green and orange-red regions and have a photoluminescence quantum yield (PL QY) up to 45%. The time-resolved PL spectroscopy and X-ray photoelectron spectroscopy characterizations reveal that the dual emissions of these NCs are derived from the intrinsic emission of Ag + and Mn 2+ , respectively. Moreover, the relative intensity ratio of dual emissions can be tailored by adjusting the Ag and Mn doping concentrations. The as-built ratiometric temperature sensors based on the codoped NCs exhibit a thermometric sensitivity of ~ 0.17% K -1 over a broad window of 80–200 K, suggesting that these codoped Zn-In-S NCs are promisingly used for bio-optical ratiometric temperature sensing.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-9
·
IF 5.479
He Shao-Bin,Chen Rui-Ting,Wu Yan-Yu,Wu Gang-Wei,Peng Hua-Ping,Liu Ai-Lin,Deng Hao-Hua,Xia Xing-Hua,Chen Wei
Platinum nanoparticles (Pt NPs) covered with a bovine serum albumin scaffold and a particle size of 1.5 nm (BSA-Pt S NPs) are shown to display enhanced multiple enzyme-mimicking activities including peroxidase, oxidase, and catalase-like activities. The peroxidase-like activity is characterized by robustness and low signal background. BSA-Pt S NPs were used to design colorimetric assays for H 2 O 2 and glucose. H 2 O 2 latter reacts with 3,3′,5,5′-tetramethylbenzidine in the presence of BSA-Pt S NPs to form a blue product with an absorption maximum at 652 nm. The assay works in the 5–250 μM H 2 O 2 concentration range. The glucose assay is based on its glucose oxidase-catalyzed oxidation to produce gluconic acid and H 2 O 2 which then is colorimetrically quantified. Response is linear in the 10–120 μM glucose concentration range, and the detection limit is 2 μM (at S/ N = 3). The method correlates well with the glucose standard method (R 2 = 0.997 in the 95% confidence interval) which confirms that glucose in human serum has been successfully detected.
Improved enzymatic assay for hydrogen peroxide and glucose by exploiting the enzyme-mimicking properties of BSA-coated platinum nanoparticles.
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Applied Nanoscience
·
2019
·Vol. 10
·期 3
·661-669
·
IF 3.198
Zhang Xudong,Ma Su,Li Aikun,Chen Linya,Lu Jiangwei,Geng Xuemin,Xie Ming,Liang Xiaoyu,Wan Yanfen,Yang Peng
Noble metal nanoparticles (NPs) have potential for use in many optical and electronic applications due to their shape- and size-dependent properties. However, it remains a significant challenge to synthesize size- and shape-controlled NPs on a large scale while maintaining their unique properties. We have demonstrated a simple and effective microreactor based on a microfluidic chip and liquid peristaltic pump for the synthesis of monodispersed Au NPs. This reactor allows for the continuous high-flux synthesis of Au NPs with precisely controlled sizes. The effects of reaction temperature, reaction time, flow ratio of the two inlets, and amount of surfactant agent are investigated in this study. The uniform and ultrafine Au NPs were synthesized by directly controlling the temperature, flow rate, surfactant concentration, and flow rate ratio. Moreover, the Au NPs are fabricated controllably, continuously, and stably on a large scale with this system. The proposed system thus contributes to the large-scale industrial production of NPs.
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Food Analytical Methods
·
2019
·Vol. 13
·期 2
·403-411
·
IF 2.413
Liu Weihua,Wang Jing,Yu Wenlong,Wang Xianghong
Flumequine (FLU) is widely used as an antibiotic in the treatment and control of animal diseases, which may result in the presence of residues harmful to humans in food products of animal origin. A novel and fast biomimetic enzyme-linked immunosorbent assay (BELISA) was developed for the determination of FLU based on a molecularly imprinted polymer (MIP) as a selective affinity agent. With an optimized molar ratio of FLU to methacrylic acid (MAA) of 1:2 determined by molecular dynamic simulations, the MIP was directly synthesized on the surface of a 96-well plate (as solid support) with FLU as the template molecule, MAA as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker, and azodiisobutyronitrile (AIBN) as the initiator. Under the optimized conditions, the BELISA method was established with a sensitivity (IC 50 ) of 0.141 μg/mL and a detection limit (IC 15 ) of 1.09 × 10 −3 μg/mL. The developed method was applied to determine FLU concentrations in spiked beef and shrimp samples, with satisfactory recovery values ranging from 80.7 to 92.2% with relative standard deviations ( n = 3) between 3.3% and 7.0%. This method can be used for the rapid determination of FLU in animal foods and has promising applications in food safety monitoring.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 8
·3167-3180
·
IF 3.442
Ren Lipei,Yu Yan,Yang Yuan,Zhang Qian,Xiao Xingfang,Liu Ruina,Xu Weilin
Zeolitic imidazolate framework-8 (ZIF-8) is regarded as an excellent adsorbent material for removing diverse toxic or hazardous gases. However, its milli- to nanoscale size typically restricts its applications. In this study, we demonstrate the ZIF-8 nanocrystals assembled on TiO 2 -coated activated carbon fiber felts via atomic layer deposition (ZIF-8@ALD-ACF felts), which can be used as a highly efficient adsorbent for HCHO removal. Using the TiO 2 -coated ACF felts as substrates via ALD can provide large number of growth sites for ZIF-8 nanocrystals, which results in fast and highly efficient removal of HCHO. Furthermore, ZIF-8@ALD-ACF felts achieve a highly efficient removal of HCHO under ultraviolet (UV) light. HCHO can be completely removed at high concentration within 110 min. Moreover, under UV light, it can be completely removed at low concentration within 6 min. The micropores in ACF and nanocages in ZIF-8 are suitable for small molecular HCHO uptaking and provide sufficient contact time for photocatalysis by TiO 2 . The ALD technology provides a useful methodology for the practical application of MOF-based materials.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Guo Ying,Zhang Juncai,Zhang Weihong,Hu Daodao
Brightly fluorescent carbon quantum dots coated with polyethylenimine (PEI-CDs) were prepared using malic acid and PEI as the precursors. The PEI-CDs have a high quantum yield (41%) and green emission (peaking at 502 nm under 430 nm excitation), both of which are not affected by high ionic strength. The PEI-CDs have a positive charge at physiological pH values and can electrostatically bind aptamers with their negative charge. This is shown for aptamers binding thrombin or ATP. Binding of aptamers results in quenching of fluorescence. If thrombin or ATP are introduced, the respective aptamer will bind them, and the complex is then released from the PEI-CDs. Fluorescence increases in proportion to the analyte concentration. Under optimized conditions, thrombin and ATP can be sensitively and selectively detected by fluorometry with lower detection limits of 1.2 and 13 nM, respectively. The assay was successfully applied to the determination of thrombin and of ATP in spiked serum samples.
Green fluorescent carbon quantum dots were functionalized with polyethyleneimine. They were applied to aptamer-based determination of thrombin and ATP. The PEI-functionalized carbon quantum dots (PEI-CDs) have bright green fluorescence are were synthesized by one-step hydrothermal treatment of malic acid and PEI. Employing the PEI-CDs, a fluorometric aptamer-based assay was developed for the determination of thrombin and ATP.
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CHEMICAL PAPERS
·
2019
·Vol. 74
·期 4
·1189-1197
·
IF 1.246
Feng Yinxia,Su Biquan,Xian Liang,Ma Yongjun,Sheng Li,Cao Ningjing
This paper presents the visible light-assisted synthesis of surfactant-free Pt nanoparticles (Pt-NPs) supported on multi-walled carbon nanotubes (MWCNTs) at ambient condition. Transmission electron microscopy (TEM) images indicate that Pt-NPs with high density and relative small in size (about 2 nm) were monodispersed on the surface of MWCNTs. The characterizations of Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), X-ray diffractometer (XRD) and ultraviolet–visible spectroscopy (UV–Vis) prove that visible light irradiation significantly affect the species distribution of [PtCl 4 ] 2− precursor in the hydrolysis and then promote hydrolysate Pt oxides loading on MWCNTs. The loading process decides the morphology of Pt-NPs rather than the following precursor reduction, which does not change the morphology but only the valance state of platinum. The catalytic activity of Pt/MWCNTs was tested in subsequent methanol electrochemical reactions and 4-nitrophenol (4-NP) reduction.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 323
·期 2
·993-1002
·
IF 1.186
Ma Zhili,Wang Yanfei,Luo Yige,Xie Xiaoqing,Xiong Zeng
Highly crosslinked organic–inorganic hybrid polymer poly(cyclotriphosphazene-co-melamine) microspheres (PZM) were synthesized by a simple method. The microspheres was characterized by FTIR, SEM and EDX. It was applied to eliminate thorium(IV) from aqueous solution under various conditions, i.e., pH, initial concentration, dosage and contact time. The experimental data were well-imitated via the pseudo-second-order kinetic model and its adsorption processes comply with the Langmuir isotherm model. Adsorption thermodynamic studies demonstrated that the adsorption process, in essence, was spontaneous and endothermic. Furthermore, the maximum experimental adsorption capacity was 98.6 mg g −1 for initial thorium(IV) concentration 50 mg L −1 . When pH = 0.0, the thorium(IV) removal efficiency reached at 76.9%, which indicates that the adsorbent can also was used in a peracid environment. Adsorption behavior of thorium(IV) onto the microspheres were weakly affected via temperature, implying that adsorption would be done at room temperature.
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