ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Dan-Dan Zhang,Zhi-Yong Guo,Peng-Fei Guo,Xue Hu,Xu-Wei Chen,Jian-Hua Wang
Polyoxometalate [{a-PW11O39Zr(μ-OH)(H2O)}2]8– (POM1) is first prepared by sandwiching ZrIV among 2 mono-lacunary α-Keggin polyoxometalates, and then novel magnetic nanoparticles (NPs), Fe3O4@polyethyleneimine (PEI)@POM1, are fabricated by coating POM1 onto the surface of magnetic Fe3O4@PEI NPs under electrostatic interaction. The obtained Fe3O4@PEI@POM1 NPs are characterized by Fourier transform infrared, zeta potential, vibrating sample magnetometer, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. Ascribed to the hydrogen-bonding and electrostatic interactions, the NPs exhibit high adsorption selectivity toward IgG, and the adsorption capacity is high up to 304 mg g–1 under optimal adsorption conditions. By using 0.01% cetyl trimethylammonium bromide to strip the adsorbed protein species, an elution efficiency of 95% is achieved. The feasibility of Fe3O4@PEI@POM1 NPs in real-world sample assay has been demonstrated by the selective isolation of IgG heavy chain and light chain from human serum, as confirmed by the sodium dodecyl sulfate polyacrylamide gel electrophoresis assay.
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JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 10
·1-11
·
IF 2.127
Liu Dongjing,Lu Cheng,Wu Jiang
Graphitic carbon nitride (g-C 3 N 4 ) with unique and versatile properties has gained increasing research concerns. Here, CuO/g-C 3 N 4 nanocomposite is fabricated and employed for gas-phase mercury (Hg 0 ) removal at low temperature. Pure g-C 3 N 4 performs well toward Hg 0 adsorption at 40–200 °C with the optimal Hg 0 removal efficiency of ~ 54.5% at 120 °C. CuO-modification can significantly promote the Hg 0 capture ability of g-C 3 N 4 , probably due to the intimate interface contact of CuO and g-C 3 N 4 . The Hg 0 removal efficiency of g-C 3 N 4 first increases and then decreases with rising temperature, while temperature shows a promotional effect on Hg 0 removal efficiency of CuO/g-C 3 N 4 . Hg 0 is oxidized into HgO by the chemisorbed oxygen originated from the O–C–N structure of g-C 3 N 4 and the lattice oxygen of CuO. g-C 3 N 4 can be efficiently activated by modifying with CuO toward enhanced Hg 0 oxidation ability, presumably attributed to the electron transfer at the interface of CuO and g-C 3 N 4 .
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CHEMOSPHERE
·
2018
·
IF 4.427
Xueming Lin,Yongwen Ma,Jinquan Wan,Yan Wang,Yongtao Li
In this study, FeMoO 4 was applied to activate persulfate (PS, S 2 O 8 2− ) for azo dye Orange G (OG) degradation. The catalyst was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption-desorption isotherms. FeMoO 4 showed excellent efficiency in activating PS for OG removal. More than 95% could be removed after 40 min under reaction conditions of 4 mM PS, 0.3 g L −1 FeMoO 4 and 0.2 mM OG. The effect of different parameters (PS doses, FeMoO 4 doses and pH) were evaluated. The results showed that acid condition provided higher efficiency and overdosing FeMoO 4 and PS presented a scavenging effect. Major intermediates were identified and possible degradation pathway was proposed. Recycle tests presented that FeMoO 4 had excellent recyclable stability in activating PS for OG removal. Sulfate radicals and hydroxyl radicals all occurred in the oxidation reactions and the former came first. The oxidation reaction was involved in the translation of Fe 2+ /Fe 3+ occurred on the surface layer. This study revealed that the FeMoO 4 /PS system is a very promising method for degrading organic contaminants in the environment.
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Frontiers of Chemical Science and Engineering
·
2018
·Vol. 13
·期 1
·70-79
·
IF 2.643
Chen Shenggang,Liu Tao,Yang Ruiqi,Lin Dongqiang,Yao Shanjing
The mixed-mode resins for protein adsorption have been prepared by a novel strategy, copolymer grafting. Specially, the copolymer-grafted resins CG-M-A with two functional groups, 5-amino-benzimidazole (ABI) and methacryloxyethyltrimethyl ammonium chloride (METAC), have been prepared through surface-initiated activator generated by electron transfer for atom transfer radical polymerization of METAC and glycidyl methacrylate (GMA), followed by a ring-open reaction to introduce ABI. The charge and hydrophobicity of CG-MA resins could be controlled by manipulating the addition of METAC and GMA/ABI. Besides, METAC and ABI provided positive effects together in both protein adsorption and elution: dynamic binding capacity of human Immunoglobulin G (hIgG) onto CG-M-A resin with the highest ligand ratio of METAC to ABI is 46.8 mg∙g –1 at pH 9 and the elution recovery of hIgG is 97.0% at pH 5. The separation experiment showed that purity and recovery of monoclonal antibody from cell culture supernatant are 96.0% and 86.5%, respectively, indicating that copolymer-grafted mixed-mode resins could be used for antibody purification.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 12
·2521-2530
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IF 3.286
Su Ruifang,Zheng Hongru,Dong Shuyue,Sun Rui,Qiao Shangna,Sun Hongjing,Ma Xinyue,Zhang Tiehua,Sun Chunyan
The development of a novel method for melamine detection that uses a FAM–aptamer–G-quadruplex construct due to the efficient quenching ability of an aptamer-linked G-quadruplex is reported herein. The construct, which is labeled with the fluorescent dye 6-carboxyfluorescein (FAM), consists of two parts: a melamine-binding aptamer and a G-rich sequence that can form a G-quadruplex structure. Because of the specific recognition of melamine by the T-rich aptamer, this aptamer folds into a hairpin structure in the presence of melamine, which draws the G-quadruplex closer to the FAM fluorophore, leading to the quenching of the fluorescence of FAM. Thus, a highly sensitive and selective fluorescence strategy for assaying melamine was established. Under optimal conditions, the fluorescence quenching is proportional to the concentration of melamine within the range 10–90 nM, and the method has a detection limit of 6.32 nM. Further application of the method to plastic cup samples suggested that it permitted recoveries of between 97.15% ± 1.02 and 101.92% ± 2.07. The detected amounts of melamine spiked into the plastic cup samples and the corresponding amounts measured by HPLC were in good accordance, indicating that this fluorescent method is reliable and practical. Owing to its high sensitivity, excellent selectivity, and convenient procedure, this strategy represents a promising alternative method of melamine screening.
Graphical abstract
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CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Zhenzhen Liu,Mingjie Chen,Yanzhu Guo,Xing Wang,Li Zhang,Jinghui Zhou,Haiming Li,Qingshan Shi
Cationic amphiphilic cellulose copolymers were prepared through grafting hydrophobic poly (p-dioxanone) (PPDO) chains onto hydrophilic quaternized cellulose derivatives (QC) via ring-opening polymerization (ROP) reaction, which was performed in 1-butyl-3-methylimidazolium chloride (BmimCl) and using 4-dimethylaminopyridine (DMAP) or 1,8-diazabicyclo (5.4.0) undec-7-ene (DBU) as catalyst. Their chemical structures and physical properties were confirmed by FT-IR, 1 H-, 13 C-, 2D HSQC-NMR, X-ray diffraction (XRD), and thermal stability (TGA) techniques, while self-assembly behavior was characterized by dynamic light scattering (DLS), transmission electron microscopy (TEM) and fluorescence techniques. Both of the sizes and critical micelle concentration (CMC) values of micelles were decreased with increasing grafting contents of PPDO in the copolymers, which were in the ranges of 110–246 nm and 64–253 μg/mL, respectively. The ζ-potentials of micelles were cationic andranged from 39.1 mV to 45.4 mV. The highest encapsulation efficiencyof paclitaxel (PTX) into the micelles was 61.8% and 92.0% of loaded PTX was continuously released from micelles in phosphate buffered saline medium for 36 h.
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ANALYTICA CHIMICA ACTA
·
2012
·
IF 4.555
Ruimin Li,Cen Xiong,Zhiyou Xiao,Liansheng Ling
A novel colorimetric method for detection of cholesterol was developed with hemin-G-quadruplex DNAzyme by transducing oxidation of cholesterol into the color change of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS 2− ). Oligonucleotide 5′-GTGGGTAGGGCGGGTTGG-3′ (Oligo-1) formed G-quadruplex structure in the presence of K + , it acted as a horseradish peroxidase (HRP) mimicking DNAzyme when binding hemin and catalyzed the oxidation of colorless ABTS 2− to green ABTS − by H 2 O 2 , which was produced by the reaction of cholesterol and oxygen that catalyzed by cholesterol oxidase. Therefore, the oxidation of cholesterol could be transduced into the color change of ABTS 2− by combining these two reactions. Under the optimum conditions, the absorbance was proportional to the concentration of cholesterol over the range of 1.0–30 μM, with a linear regression equation of A = 0.362 + 0.0256 C ( C : μM, R = 0.998) and a detection limit of 0.10 μM (3 σ /slope). Moreover, the practicability of the assay in the detection of cholesterol in human serum was studied as well.
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DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 18
·7912-7920
·
IF 4.177
Liang Min,Tao Li,Qi Tan,Xiaoping Tan,Wu Pan,Li He,Jie Zhang,Encai Ou,Weijian Xu
The use of 5-guanosine monophosphate (GMP) with Sr2+ ions to form G-quadruplex bundles as supramolecular templates for the preparation of hierarchical mesoporous silica nanotube materials is reported here, and some mesopores with a diameter of 4–22 nm were obtained. Furthermore, some mesopore channels which run perpendicularly to the center axis of the tube and penetrate right through the outer wall of the nanotubes were achieved by removing the templates. Besides, porous hollow silica spheres were obtained by changing some of the reaction conditions during the process of preparation. Their structures are stable even after high temperature calcination. A formation mechanism was proposed and discussed, and their structures were characterized using a number of means including X-ray diffraction, IR spectra, N2 adsorption–desorption isotherms, scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
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Materials Science & Engineering C-Materials for Biological Applications
·
2017
·
IF 4.164
Jian-Tao Lin,Wen-Jia Pan,Jun-Ai Zhang,Wei Wang,Jia Zhong,Jia-Min Su,Tong Li,Ying Zou,Guan-Hai Wang
The codelivery of drug and gene is a promising method for cancer treatment. In our previous works, we prepared a cationic micelles based on chitosan and poly-( N -3-carbobenzyloxylysine) (CS-g-PZLL), but transfection ratio of CS-g-PZLL to Hela cell was low. Herein, to improve the transfection efficiency of CS-g-PZLL, curcumin was loaded in the CS-g-PZLL micelle. After irradiation, the obtained curcumin loaded micelle showed a better transfection, and the p53 protein expression in Hela cells was higher. The apoptosis assay showed that the complex could induce a more significant apoptosis to Hela cells than that of curcumin or p53 used alone, and the curcumin loaded micelle inducing apoptosis was best after irradiation. Therefore, CS-g-PZLL is a safe and effective carrier for the codelivery of drug/gene, and curcumin could be used as a photosensitizer to induce a photoenhanced gene transfection, which should be encouraged in improving transfection and tumor therapy.
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AUSTRALIAN JOURNAL OF CHEMISTRY
·
2016
·Vol. 70
·期 3
·271-279
·
IF 1.427
Pengfei Xing,Rongxiang Zhao,Xiuping Li,Xiaohan Gao
The ultra-deep desulfurization of fuel oil has become inevitable for environmental protection. Here, CoWO4/g-C3N4 was used as a catalyst, H2O2 as an oxidant, and 1-ethyl-3-methylimidazolium ethylsulfate ([EMIM][EtSO4], IL) as an extractant for the oxidative desulfurization of model oil. Scanning electron microscopy, FT-IR spectroscopy, N2 adsorption isotherms, and X-ray diffraction were used to confirm the morphology, structure, and properties of the catalysts. The influence of calcination temperature, loading dose of cobalt, amount of H2O2, reaction temperature, and other parameters were investigated. The removal rate of sulfide in model oil could reach 92.9 % at 80°C in 180 min under the optimal operation conditions (V(oil) = 5 mL, T = 80°C, m(catalyst) = 0.03 g, V(H2O2) = 0.4 mL, t = 180 min, V(IL) = 1.0 mL). In addition, the catalyst was reused five times with no significant reduction in the catalytic activity.
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Chemistry-An Asian Journal
·
2016
·Vol. 12
·期 5
·515-523
·
IF 4.592
Feng-Yun Su,Wei-De Zhang
Graphical Behind the sheets : Carbonyl-grafted g-C 3 N 4 porous nanosheets (COCNPNS) were fabricated by a two-step thermal process using melamine and oxalic acid as starting reagents followed by thermal etching by O 2 (see figure). Under visible-light illumination, the prepared COCNPNS exhibited a superior photocatalytic hydrogen evolution rate. Carbonyl-grafted g-C 3 N 4 porous nanosheets (COCNPNS) were fabricated by means of a two-step thermal process using melamine and oxalic acid as starting reagents. The combination of melamine with oxalic acid to form a melamine–oxalic acid supramolecule as a precursor is key to synthesizing carbonyl-grafted g-C 3 N 4 . The bulk carbonyl-grafted g-C 3 N 4 (COCN) was further thermally etched onto porous nanosheets by O 2 under air. In such a process, the carbonyl groups were partly removed and the obtained sample showed remarkably enhanced visible-light harvesting and promoted the separation and transfer of photogenerated electrons and holes. With its unique porous structure and enhanced light-harvesting capability, under visible-light illumination ( λ >420 nm) the prepared COCNPNS exhibited a superior photocatalytic hydrogen evolution rate of 83.6 μmol h −1 , which is 26 times that of the p-CN obtained directly from thermal polycondensation of melamine.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Wenyu Bai,Chenglong Li,Feng Pan,Yu Luo,Tongtong Gao,Di Yu,Xiaorui Wang,Han Sun,Shuang Wang
The choice of electrode materials affects the electrochemical performance of supercapacitors, and the selection of suitable electrode materials is necessary to enable the industrialization of supercapacitors. The conductive polymer polypyrrole is well known to researchers for its excellent electrochemical properties, but pure polypyrrole does not fulfill its advantages. The disadvantage is that the microstructure of the polypyrrole molecules, which is favorable for energy storage when supercapacitors are being charged and discharged, is greatly damaged by the contraction/expansion of the polypyrrole molecular chains, which directly affects the electrochemical performance of the supercapacitors assembled subsequently. So firstly, we modified PPy by using the functional group nature of 3-amino-4-methylene-phenylboronic acid (g-PPy) to give it more active sites. Secondly, MXene acts as the backbone of g-PPy, which limits the expansion and contraction of the volume supercapacitors and improves cycle stability when charging and discharging. In contrast, the compounded MXene/g-PPy has good specific capacitance and stability after several thousand cycles, due to the nature of the functional group of 3-amino-4-methylenebenzeneboronic acid, a large number of g-PPy active sites, the good hydrophilicity of the MXene surface for interaction with sodium dodecylbenzene sulfonate and the hydrogen bonding between MXene and g-PPy, Even after 10000 charge/discharge cycles, its stability is significantly improved with a capacity retention rate of 98.6 %. In addition, the corresponding symmetrical supercapacitors were tested to exhibit significant cycling stability at a low temperature. This study, therefore, provides a method for the preparation of MXene based electrodes with high cycling stability by modifying the electrodes.
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