LUMINESCENCE
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2019
·Vol. 34
·期 8
·903-910
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IF 1.691
Huan-ren Cheng,Yan Ji,Fei Liu,Xiao-ju Lu
In this paper, a new ‘turn-on' fluorescence probe for the rapid, sensitive, and visual detection of hypochlorite is reported. The push–pull type trianiline–tricyanofuran-based fluorescent probe was prepared using a condensation reaction between tricyanofuran and the thiophene–trianiline derivative that had high quantum yields and showed aggregation-induced emission enhanced properties. Upon exposure to hypochlorite, prominent fluorescence enhancement of the probe was observed via the release of the fluorophore from the probe. The probe showed a ratiometric absorption change at 315 nm and 575 nm. Importantly, the probe showed an excellent detection limit for hypochlorite at 1.2 × 10 −7 M in solution and it was successfully applied for monitoring hypochlorite in waste water by test strip. This work reports a new fluorescence analytical sensing method for hypochlorite that has potential practical value in environmental monitoring and biological discrimination.
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ANALYTICA CHIMICA ACTA
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2019
·
IF 5.256
Shuang Liu,Yong-Liang Yu,Jian-Hua Wang
Long-term and multipoint monitoring is very important to evaluate the safety of water environment. Atomic fluorescence spectrometer (AFS) is generally used for analyzing metals or metalloids in water quality monitoring. In the present work, for the first time, AFS is employed for sensitive monitoring of nitrogen nutrients, i.e., NO 2 − , NO 3 − and NH 4 + , with nitric oxide (NO) vapor generation. By taking advantage of the different vapor generation conditions for NO 2 − , NO 3 − and NH 4 + , a unit integrating with sampling, heating, cooling, gas-liquid separation and moisture removal is employed for controlling the vapor generation process, by reacting with either iodide or titanium (III). An antimony hollow cathode lamp is used for the excitation of NO to produce fluorescence emission at 193–320 nm. Linear calibration graphs are obtained within 0.02–2, 0.1–20, 0.2–1 mg L −1 for NO 2 − , NO 3 − and NH 4 + , along with detection limits of 0.006, 0.03, 0.06 mg L −1 , respectively. The new analytical strategy obviously broadens the application of AFS, and it is well demonstrated by the determination of NO 2 − , NO 3 − and NH 4 + in certified reference materials as well as various real water samples, providing competitive sensitivity with the current techniques for nutrient monitoring in environmental water.
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Analytical Methods
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2019
·Vol. 11
·期 14
·1951-1957
·
IF 2.378
Qiumin Ye,Jihong Hu,Datong Wu,Baozhu Yang,Yongxin Tao,Yong Qin,Yong Kong
Recognition of enantiomers using simple and smart devices remains a challenge in modern chemistry, and the development of advanced host materials is the key for the chiral recognition of guest enantiomers. Here, we report a novel enantioselective sensing device based on a bioactive tripeptide, glutathione (GSH). During the construction of the GSH-based enantioselective sensing device, the mercapto group (–SH) of GSH was effectively protected by α-cyclodextrin (α-CD) from being oxidized to disulfide bond (S–S). The α-CD/GSH showed an efficient recognition of tryptophan (Trp) enantiomers due to the intrinsic chiral microenvironment of GSH and the well-retained spatial configuration of GSH. The temperature sensitivity of the α-CD/GSH enantioselective sensing device is also discussed. Finally, the proposed α-CD/GSH was successfully applied in the analysis of the ratio of L- and D-Trp in non-racemic enantiomer mixtures.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Shangpeng Liu,Zhiqin Zheng,Shuang Wang,Shaojuan Chen,Jianwei Ma,Guosai Liu,Bin Wang,Jiwei Li
In this study, polydopamine (PDA) coated chitosan/calcium pyrophosphate hybrid microflowers (PDA@CS-CaP) were prepared using a facile approach and evaluated as a hemostatic agent. The surface morphology and elements, chemical groups, porous structure, thermostability, zeta potential, as well as surface wettability were systematically characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), N 2 adsorption-desorption, thermogravimetry (TGA) and contact angle apparatus. Due to the synergistic effects of the high hydrophilicity (water contact angel nearly 0), chemical activation (the amino and phenol group of PDA), and the flower-like porous hierarchical structure, the prepared PDA@CS-CaP could induce hemocytes and platelets aggregation, promote the blood clotting and achieve bleeding control in vitro and in vivo. Furthermore, the PDA@CS-CaP had no exothermic adverse effects and exhibited better biocompatibility (no cytotoxicity against fibroblasts cells). Thus, the PDA@CS-CaP were expected to be a promising candidate for a safe and promising hemostatic agent because of its porous and hierarchical structures as well as the active PDA coating.
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GREEN CHEMISTRY
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2019
·Vol. 21
·期 15
·4152-4158
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IF 9.405
Bernard Baffour Asare Bediako,Qingli Qian,Jingjing Zhang,Ying Wang,Xiaojun Shen,Jinbiao Shi,Meng Cui,Guanying Yang,Zhen Wang,Shengrui Tong,Buxing Han
Synthesis of ethanol from cheap and renewable CO2 is of great importance, but is still a challenge. Because it involves CO2 hydrogenation with simultaneous C–C bond formation, and the synergy of two or more transition metals is usually required for catalyzing the reaction effectively. Moreover, higher temperature is needed to drive the reaction. In this work, we found that the monometallic Ru3(CO)12 catalyst could efficiently catalyze the synthesis of ethanol from CO2, methanol and H2 in the ionic liquid, 1-butyl-3-methylimidazolium chloride ([bmim]Cl), using LiCl and LiI as promoters. Ethanol could form at 120 °C, which is among the lowest temperatures reported to date. A detailed study indicated that ionic liquids play an important role in monometallic catalysis. High ethanol selectivity and activity were obtained under optimized conditions. In addition, the catalyst could be easily recycled and the TON of ethanol reached 180 after five cycles. To our knowledge, this is the first time that an ionic liquid has been used as a reaction medium to produce ethanol using CO2 and H2.
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ACS Applied Bio Materials
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2019
·
IF 0
Jia Tian,Chao Xiao,Baoxuan Huang,Xiaoze Jiang,Hongliang Cao,Feng Liu,Weian Zhang
Nowadays, multidrug resistance is the main challenge during cancer chemotherapy. Photochemical internalization (PCI) has been demonstrated to be a unique and promising approach to overcome multidrug resistance with light-harnessed activation. Here, an amphiphilic pH-responsive block copolymer with IR780 at the junction point [PEG-IR780-PDEAEMA; PEG, poly(ethylene glycol); PDEAEMA, poly((diethylamino)ethyl methacrylate)] has been designed as a perfect drug release platform as well as a functional macromolecular photosensitizer of PCI. PEG-IR780-PDEAEMA was synthesized by the combination of RAFT polymerization and click chemistry and further self-assembled into spherical micelles in aqueous solution. Notably, IR780 moieties were dispersed regularly around the core of the spherical micelles, which led to the diminishment of the aggregation-caused quenching effect of photosensitizers and high singlet oxygen quantum yield. Confocal laser scanning microscopy results showed that a high amount of doxorubicin (DOX) was translocated into the nucleus with NIR light irradiation through the PCI effect. Moreover, DOX-loaded PEG-IR780-PDEAEMA micelles showed much higher phototoxicity under short-time NIR light irradiation than their dark toxicity. Therefore, this DOX-loaded drug release platform based on pH-sensitive IR780-containing block copolymers has the potential to offer an efficient strategy for addressing drug resistance.
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CATALYSIS COMMUNICATIONS
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2020
·
IF 3.612
Miao Ren,Fengping Fu,Qian He,Fang Liao
A novel ZSMo core-shell nanowire photocatalyst was synthesized by ion exchange and hydrothermal methods. The photocatalytic activity of ZSMo nanocomposites was evaluated via photolysis of water to produce hydrogen. The results showed that the hydrogen generation rate of ZSMo-0.1 core-shell nanowires was the highest, which was about 23 times that of pure ZnO. The improvement of photocatalytic activity was attributed to the formation of type II and ternary heterojunctions, which enable the rapid separation of photo-induced charge carriers and capture more light radiation. It was confirmed by UV–Vis diffuse reflectance spectroscopy, electrochemical impedance spectroscopy and photocurrent analysis.
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JOURNAL OF APPLIED POLYMER SCIENCE
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2019
·Vol. 137
·期 16
·48594
·
IF 2.188
Rui Wang,Yao Xiao
In this study, we prepared monosultap microcapsules in an inverse emulsion through interfacial polymerization for the first time. The microcapsules are spherical pellets with intact and smooth shell and have a narrow particle size distribution with an average size of about 2.35 μm. More importantly, our microcapsules have excellent thermal stability with a starting decomposition temperature of 233.1 °C, high encapsulation efficiency of 81.9% as well as long-term slow release of monosultap under different conditions. In addition, the shell of the microcapsules can degrade completely in the natural condition, avoiding the pollution to the environment. It can be believed that our microcapsules will show good service performance if employed in agricultural industry. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48594.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Qiuli Cheng,Xiaowei Guo,Xiaojuan Hao,Zuosen Shi,Song Zhu,Zhanchen Cui
Antibacterial coatings have drawn much attention because of their high potential applications in medicine. However, the weak mechanical property, poor biosafety, and biocompatibility of most established antibacterial coatings restrict their applications. In this study, robust antibacterial coatings were fabricated via a simple organic–inorganic hybrid method. The polymer component provides an excellent antibacterial property to the coatings, and the hybrid silica sol improves the hardness of coatings. After cross-linking, network-structured coatings were formed. The coating surfaces exhibited high transmittance, excellent mechanical property, and good antibacterial effect against Escherichia coli (Gram-negative) and Streptococcus mutans (Gram-positive). Additionally, the robust coatings were noncytotoxic with satisfactory biocompatibility. Such results provide a theoretical basis for their applications in the biomedical field.
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BIOSENSORS & BIOELECTRONICS
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2018
·
IF 8.173
Hongxiao Yang,Jiagang Hou,Zhaohui Wang,Tingting Zhang,Caixia Xu
The accurate detection of the superoxide anion (O 2 •− ) has vital academic and medical diagnostic significance due to its important dual roles in biological functioning. In this work, hollow porous PtAg nanospheres (PtAg HPNSs) were fabricated by a facile hydrothermal method followed by a dealloying procedure. The as-made PtAg nanospheres possessed hollow interiors and porous shells composed of interconnected ligaments and pores with the typical size around 4 nm. Benefitting from the unique hollow nanoporous architecture and the specific alloying effect, the PtAg HPNSs showed high electrocatalytic activity towards superoxide anions. The constructed biosensor based on PtAg HPNSs presented a fast and ultrasensitive response in a wide range of 0.8–1080 nM with much higher sensitivity of 4.5 × 10 −2 μA cm −2 nM −1 and low detection limit of 0.2 nM (S/N = 3). Moreover, the novel biosensors can achieve electrochemical detection for O 2 •− released from living cells, exhibiting outstanding real time detection capability in cell environment. The facile controllable fabrication and unique sensing performance for PtAg HPNSs offers potential practical applications in developing highly sensitive and stable biosensor towards superoxide anion.
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Journal of Environmental Chemical Engineering
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2018
·
IF 0
Baowei Wang,Shumei Yao,Yeping Peng,Yan Xu
Non-thermal plasma (NTP) combined with catalysts has been regarded as a promising approach for the removal of VOCs. In the present work, a series of TiO 2 -BaTiO 3 catalysts were prepared by simple mechanical mixing. The performance of the catalysts on degradation of high concentration of toluene was investigated in a dielectric barrier discharge (DBD) plasma system . The effects of input power, mass ratio of Ti/Ba, gas flow rate and the initial concentration of toluene on the removal of toluene and the selectivity of CO 2 as well as the energy yield have been investigated. The toluene removal efficiency and CO 2 selectivity increased obviously in the plasma-catalytic system compared with the single NTP system. The removal efficiency of toluene with different catalysts abided by the following rules: Ti1Ba1 > Ti2Ba1 > Ti1Ba2 > BaTiO 3 > TiO 2 . The reason for the best performance of Ti1Ba1 is that TiO 2 offered the providential number of electron-hole pairs while BaTiO 3 supplied the fitting number of high energy electrons . Additionally, the synergistic effects between TiO 2 and BaTiO 3 also reached its maximum in this case. The concentration of O 3 in the exhaust gas was also detected and it reached the lowest point when Ti1Ba1 catalyst was packed in the discharge chamber.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Linlin Hu,Xing Wei,Jie Meng,Xiaoyan Wang,Xuwei Chen,Jianhua Wang
The development of fluorescent probes for detection of glutathione (GSH) has attracted extensive attentions due to its close association with cellular functions and diseases. Herein, a fluorescence enhancement sensing system based on acetaldehyde-modified-cystine (AMC) is reported for the detection of thiols, providing detection limits of 36 and 52 μmol L −1 for GSH and cysteine (Cys) respectively. Importantly, the fluorescence response of AMC is highly selective toward thiols with respect to the coexisting species in real biological matrixes. Considering the fact that GSH levels in cancer cells is significantly higher than those of Cys and other reducing species, the fluorescence enhancing response of AMC in cancer cells is dominated by GSH. Therefore, this provides the possibility for selective intracellular GSH imaging in living cancer cells, i.e., HeLa cells in the present study.
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