ANALYTICA CHIMICA ACTA
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2018
·
IF 5.123
Binxiao Li,Jing Liu,Hong Zhou
An amplified fluorescence biosensing strategy for serum prostate specific antigen (PSA) was developed on the basis of DNAzyme. In presence of cofactor Zn 2+ , Zn 2+ -dependent DNAzyme could cleave the hairpin substrate probes which were dispersed in solution and generate remarkable fluorescent signal. Taking advantage of the magnetic beads as a carrier, one target protein could bring plentiful hairpin substrate probes on to the electrode through a sandwich structure (Ab 1 /PSA/biotin-Ab 2 ). Moreover, during the cleavage process of as formed DNAzyme, DNAzyme did not be destroyed and could further react with other hairpin probes, then generated continuous fluorescent signal. Benefited by this amplified strategy, the limit of detection (LOD) was low to 0.05 ng mL −1 , which was much lower than our previous reports. This method could be applied to detect different protein biomarkers in serum without corresponding aptamers by changing the corresponding antibodies and thus showed a remarkable prospect in clinical application.
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高影响因子
CARBON
·
2018
·
IF 7.082
Jingwen Gao,Huiwen Xiong,Wei Zhang,Ying Wang,Hangxing Wang,Wei Wen,Xiuhua Zhang,Shengfu Wang
Here, an electrochemiluminescent aptasensor based on β-cyclodextrin/graphitic carbon nitride (β-CD/g-C 3 N 4 ) composite for selective and highly ultrasensitive assay of platelet derived growth factor BB (PDGF-BB) is fabricated. To achieve the sensitive and specific detection of PDGF-BB, it is an available strategy to explore excellent electrochemiluminescent (ECL) luminophores with the advantages of high electrochemical-driven luminescent activity and a specific recognition function. In this work, for the first time a novel β-CD non-covalently functionalized g-C 3 N 4 composite β-CD/g-C 3 N 4 was employed to construct the ECL detection platform for PDGF-BB based on its aptamer. The limit of detection was determined to be as low as 2.6 × 10 −13 g/mL. It was observed that β-CD was playing a key role in improving the adamantane-labeled DNA amount modified on the electrode surface. It can further help to amplify the ECL quenching effect by both energy transfer and photo-excited electron transfer processes between g-C 3 N 4 emitter and ferrocene quencher. It is anticipated that β-CD/g-C 3 N 4 may be a class of promising material for constructing ECL sensors.
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Advanced Materials Interfaces
·
2018
·Vol. 5
·期 6
·1701326
·
IF 4.834
Changxu Lin,Zheng Xiang,Chen Song,Youhui Lin,Mengchun Xu,Xuefen Wang,Chenxu Wu,Xiang-yang Liu
A new on-site detection strategy is developed based on reactional wettability variation (RWV), which is induced by the coordination reaction between azoimidazole (AzoIm) ligands on an electrospun polymer membrane and the analytes. A sensor unit is fabricated by implanting photoresponsive AzoIm ligands on an electrospun polymer membrane. Contact angle of analyte solution droplets on the membrane surface is varied by coordination reaction between ligands and analytes. The response variation of each analyte is influenced by the membrane-forming polymer and the conformation of AzoIm. Based on these two factors, the sensor is expanded into a sensor array to offer on-site detection. The principle component analysis is further applied to evaluate the detection performance and influential structural factors of the array on those ions. The differential response it works on results from varied binding constants of ion–AzoIm complexes and pH of the analyte solutions. Moreover, the detection of metal ions is extended to the bioinorganic molecule of hemin in the same mechanism. It is envisioned that the application of the RWV general pattern can open new possibilities for detection.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Yanni Liu,Zhi Wang,Song Zhao,Xiaochang Cao,Nan Li,Jixiao Wang,Shichang Wang
Impacts of substrate membrane storage conditions, which might have special significance in the industry and laboratory research of composite membranes, are rarely reported. Herein, the polysulfone ultrafiltration membrane was chosen as a typical substrate membrane and differences between substrate membranes stored in wet and dry conditions were discussed. An easy-operational hydrothermal pretreatment method was therefore proposed to regenerate the dry substrate membranes. The substrate membranes were heated in deionized water, and the pore morphology was significantly improved after the pretreatment. Three types of additives were applied to improve the effects of pretreatment and the effects of the hydrothermal pretreatment turned to be stronger as the concentration of the additive increased. Membrane structure parameters were investigated and the dry support membranes pretreated with 3.0% or 6.0% molar fraction ethanol displayed approaching structure parameters with wet membranes pretreated with the same conditions, which means the dry substrate membranes were successfully regenerated. Poly(vinylamine)-polysulfone composite membranes were prepared with polysulfone substrates before and after pretreatment, and tested by using CO 2 /N 2 (15/85 by volume) mixed gas. Composite membranes prepared with wet and dry polysulfone substrates pretreated with 3.0% molar fraction ethanol exhibited similar CO 2 permeance, which confirmed that the dry substrate membranes were effectively regenerated.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 18
·4620-4627
·
IF 5.16
Yunhe Jin,Binshen Wang,Wenquan Zhang,Shi Huang,Kangcai Wang,Xiujuan Qi,Qinghua Zhang
Graphical Alternative bipropellants : A series of triaminocyclopropenium cation based hypergolic ionic liquids were designed and synthesized. These ionic liquids demonstrate promise as potential alternatives to toxic hydrazine derivatives in liquid bipropellant formulations (see figure). A novel family of hydrophobic triaminocyclopropenium cation based ionic liquids have been synthesized, and their structures and physicochemical properties characterized by NMR and IR spectroscopy, elemental analysis, differential scanning calorimetry, and hypergolic tests. The experimental results showed that all of these ionic liquids exhibited the expected hypergolic reactivity with the oxidizer white fuming nitric acid. Among them, the hypergolic ionic liquid based on the cyanoimidazolylborohydride anion showed excellent integrated properties, including high decomposition temperature (194 °C), high density (0.95 g cm −3 ), moderate viscosity (44 MPa s), ultrafast ignition delay time (6 ms), and high specific impulse (301.9 s); this demonstrates its potential as an environmentally friendly alternative to toxic hydrazine derivatives.
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高影响因子
FIBERS AND POLYMERS
·
2024
·Vol. 25
·期 5
·1815-1824
·
IF 2.2
Xu Jiwei,Zhao Hongjuan,Zhao Qian,Xiong Xiaoqing,Zheng Laijiu,Jiao Chengqi
The color-rendering abilities of esterified natural dyes are influenced by the structure of their parent dyes and the position at which the ester group is introduced, resulting in low efficiency in screening and synthesizing suitable esterified natural dyes for dyeing natural fibers with supercritical carbon dioxide. In this study, density functional theory was used to quickly screen the parent natural dyes and esterification position of natural dyes. The findings indicated that B3LYP/def2-TZVP level and CAM-B3LYP (ω = 0.01)/def2-TZVP level yield the most accurate UV–vis absorption spectra calculations for natural dyes and their esterified derivatives, as evidenced by the smallest error compared to experimental values. The rutin, the carminic acid, and the icariin as the parent dyes were more suitable for esterification, and the introduction of ester groups solely on the glycosides of these dyes had negligible impact on their color-rendering abilities. Furthermore, considering the influence of ester groups on natural dye solubility, it was observed that the dyeing properties of glycoside esterified products derived from rutin, carminic acid, and icariin were better than those of their parent dyes, rendering them more appropriate for dyeing natural fibers in supercritical carbon dioxide.
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BIOSENSORS & BIOELECTRONICS
·
2024
·
IF 10.7
Jinlong Wang,Ji Tan,Zhe Zhao,Jiayuan Huang,Junjie Zhou,Xinyi Ke,Zihan Lu,Gaoshan Huang,Hongqing Zhu,Xuanyong Liu,Yongfeng Mei
The limitations of solvent residues, unmanageable film growth regions, and substandard performance impede the extensive utilization of metal-organic framework (MOF) films for biosensing devices. Here, we report a strategy for ion design in gas-phase synthesized flexible MOF porous film to attain universal regulation of biosensing performances. The key fabrication process involves atomic layer deposition of induced layer coupled with lithography-assisted patterning and area-selective gas-phase synthesis of MOF film within a chemical vapor deposition system. Sensing platforms are subsequently formed to achieve specific detection of H 2 O 2 , dopamine, and glucose molecules by respectively implanting Co, Fe, and Ni ions into the network structure of MOF films. Furthermore, we showcase a practical device constructed from Co ions-implanted ZIF-4 film to accomplish real-time surveillance of H 2 O 2 concentration at mouse wound. This study specifically elucidates the electronic structure and coordination mode of ion design in MOF film, and the obtained knowledge aids in tuning the electrochemical property of MOF film for advantageous sensing devices.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Wentao Zheng,Jialing Chen,Yujiao Jia,Nengqi Sun,Shiping Wang,Xianku Wu,Xuehua Zhang
A series of 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU)/N-heterocyclic DESs aqueous solutions were designed and synthesized as CO 2 capture agents. They showed excellent performance in absorption capacity, especially for the low-pressure CO 2 . The CO 2 loads in the absorbents were higher than 1.0 mol/mol when the pressure was just 0.1 bar. Through a combination of 13 C NMR spectra, FT-IR spectra and absorption experiments, a novel absorption mechanism was proposed. It was the shuttling role of the carbamate generated from CO 2 and nitrogen heterocycles, along with the synergistic roles of the DBU and water, that caused the high absorption capacity of the DBU/N-heterocyclic DESs for CO 2 . Meanwhile, the thermodynamic parameters, the activation energy and the regeneration efficiency were all measured to estimate the absorption performance of the DBU/N-heterocyclic DESs aqueous solutions for low-concentration CO 2 .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Jiabao Li,Dongxia Yan,Xiujie Cheng,Chunrui Rong,Jian Feng,Xin Feng,Jiayu Xin,Qing Zhou,Yi Li,Junli Xu,Xingmei Lu
The methanolysis of polyethylene terephthalate (PET) can address the environmental pollution and resource waste caused by waste PET, and the obtained monomer dimethyl terephthalate (DMT) is easy to separate and purify. However, conventional methanolysis of PET usually uses metal-containing catalysts, resulting in metal residues in the degradation products, which affects subsequent high-value utilization. Meantime, the reaction conditions of high temperature and high pressure promotes the occurrence of side reactions and reduces the yield of the main products. Herein, the nonmetallic deep eutectic solvent (DES) 1,5-diazabicyclo [4.3.0]-5-nonene (DBN)/Phenol was employed as a catalyst for PET methanolysis. 100% PET conversion and 95.3% DMT yield were obtained at 130 °C for 1 h. The possible reaction mechanism was investigated by combining NMR, FT-IR, GPC analysis, and DFT calculations. DBN and phenol were connected through N–H–O hydrogen bonding, where the hydrogen atom interacted with the carbonyl oxygen of PET and the oxygen atom activated the hydroxyl group of methanol. Additionally, GPC analysis showed that the dissolution and degradation of PET were simultaneous, which enhanced mass transfer and facilitated the reaction. The kinetic studies showed that PET methanolysis followed the first-order kinetic model with an activation energy of 103.3 kJ/mol, which was lower than the literature-reported value. This research provides an efficient nonmetallic deep eutectic solvent catalyst for PET methanolysis, which solves the problem of metal residues in the degradation products and reduces the reaction temperature. It is of great significance to simplify the purification steps and improve the economy of regeneration.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiangxiang Wang,Xin Guo,Junwen Qi,Hui Li,Yujun Zhou,Zhigao Zhu,Yue Yang,Jiansheng Li
Efficient capture of radioactive iodine serves as an inevitable demand for secure utilization of nuclear energy, environmental conservation, and human health. In this contribution, a series of iodine adsorbent materials Im@UiO-66 were fabricated by encapsulating imidazole (Im) molecules into the pore of a classical zirconium-based metal–organic frameworks UiO-66, employing a simple and feasible vapor-diffusion strategy. Compared with original UiO-66, the resulting composites achieved a significant enhancement in iodine capture performance. Particularly, Im@UiO-66-3 demonstrated outstanding iodine adsorption performance with capacities of 4.66 g g −1 for vapor and 915 mg g −1 for solution, which were 3.5 and 9.2 times of the original UiO-66, respectively. Moreover, the introduction of nitrogen through ligand encapsulation provided additional sites for iodine immobilization. The primary mechanism underlying this remarkable performance was identified as charge transfer between iodine and imidazole (Im) molecules. The research offers valuable insights for the design of high-efficiency iodine adsorbents.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Delai Jiao,Hengji Zhao,Haofei Sima,Chunzu Cheng,Bo Liu,Chunling Zhang
In this work, we synthesized a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) derivative flame retardant dopamine modified DOPO (DOPO-DA) for flame retardant thermosetting epoxy resins (EP). The effects of different amounts of flame retardants on the flame retardancy, thermal properties, and mechanical properties of EP composites were studied. Compared with the control EP, the peak heat release rate (PHRR) of EP/5 wt% DOPO-DA decreased by 26.1%. In addition, EP/5 wt% DOPO-DA reached V-0 level. It can be attributed to the quenching effect of P element and catechol groups in DOPO-DA, reducing the active free radicals. N element can release non-combustible gases to dilute the concentration of oxygen. Meanwhile, P element can promote the formation of a dense carbon protective layer and slow down the heat and oxygen transfer on the surface. In addition, DOPO-DA can also participate in the crosslinking reaction of EP as a curing promoter, reducing crosslinking density and improving tensile properties.
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FUEL
·
2024
·
IF 6.7
Yurou Shao,Yangyang Jiang,Dong Wang,Benshuai Guo,Jingyan Zhao,Zhibin Zhou,Jianqiu Chen,Ruixin Guo,Yuntao Lei,Lili Jin
Capturing and recovering carbon dioxide (CO 2 ) from the combustion of fossil fuels is an effective way to reduce carbon emissions, as CO 2 is not only a threat to the environment but also an important C1 feedstock. In the current work, a series of trioctylphosphine oxide (TOPO)-based azole deep eutectic solvents (DESs) have been synthesized for the efficient absorption of CO 2 . The solid–liquid phase diagrams of the DESs were projected using the prediction data from COSMO-RS, and the experimental melting temperature was found to be lower than that of the prediction. These DESs exhibit satisfactory physical properties, including low viscosities (20–60 mPa·s) and high thermal decomposition temperatures (up to 192.5 °C). Furthermore, the CO 2 uptake process was carried out at 35 °C and 0.1 MPa, and the results demonstrated that the CO 2 uptake capacity was positively influenced by hydrogen bond donors (HBDs), mole fraction of HBDs, temperatures, and humidity. Among the DESs, TOPO-imidazole (1:1) was notable for its high absorption capacity of 0.062 mol CO 2 /mol DES, as well as its excellent recyclability. There was no discernible decline in the CO 2 uptake capacity after four absorption–desorption cycles. In this work, NMR and FT-IR investigations indicated the physical absorption mechanism of this system. The designed DESs have the potential to be effective absorbents for efficient reversible CO 2 capture.
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