JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2016
·Vol. 20
·期 5
·1377-1389
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IF 2.327
Hui Yuchen,Ma Xiaoyan,Qu Fengjin,Chen Fang,Yu Jie,Gao Yan
A facile strategy is developed to fabricate an Au-CMCD/PCMCD electrode with high efficiency, universal, and selectivity electrocatalysis through electro-depositing carboxymethyl-β-cyclodextrins with gold nanoparticles (Au-CMCD) followed by employing electro-polymerization carboxymethyl-β-cyclodextrin (PCMCD). The chemical structure, microstructure, electrochemical activity, and electrocatalytic properties of Au-CMCD/PCMCD electrode are investigated. Due to the synergistic effect of the PCMCD and Au-CMCD layers, the as-prepared electrode exhibits an outstanding enhancement of universal electrocatalytic activity to eight kinds of crucial biomolecules and drugs, such as chloramphenicol, thymine, and glucose. Then, as a target analyte, glucose is used to investigate the sensing performances of Au-CMCD/PCMCD electrode. The amperometric detection of glucose shows a wide linear range expanding to 0.001∼110 mM with a low detection limit of 0.99 μM. More importantly, the absorption effect of PCMCD is stronger to glucose than other interfering species, which is favorable to avoid the influence of possible interfering substances. Furthermore, the glucose sensors reveal good stability and repeatability.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Tongfan Hao,Xiao Wei,Yijing Nie,Yeqing Xu,Kai Lu,Yongsheng Yan,Zhiping Zhou
In this work, 3-aminophenylboronic acid (APBA) functionalized dual-emission quantum dots (QDs) were prepared and utilized as the ratiometric fluorescence probe for the onsite naked eye determination of glucose. The unique ratiometric fluorescence probe, which combined ratiometric fluorescence technique with boric acid functional materials into one system, has been prepared by hybridizing red-emitting CdTe QDs (r-QDs) and green-emitting CdTe QDs (g-QDs). The fluorescence of the embedded r-QDs stays constant, whereas the g-QDs functionalized with APBA can selectively bind glucose by the chemistry of boronic acid and cis diol compounds, leading to the fluorescence of g-QDs quenched due to the surface quenching states induced mechanism and resulting in continuous fluorescence color changes (from green to red) of the ratiometric fluorescence probe system. Under optimum conditions, the proposed ratiometric probe was used for selective detection of glucose in a concentration range of 0.1–2.0 mmol/L with a detection limit of 4.5 μmol/L. Moreover, the developed ratiometric fluorescence probe was successfully applied to the detection of glucose in human serum samples. The present study provides an efficient and facile ratiometric fluorescence probe for rapid, convenient, sensitive and selective visual identification of glucose in blood glucose sensing without the need of complex equipment.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Lingyun Jiang,Lipeng Zhou,Jinyu Chao,Huiting Zhao,Tianliang Lu,Yunlai Su,Xiaomei Yang,Jie Xu
Conversion of biomass derived carbohydrates to alkyl levulinates is an important process due to the wide application of alkyl levulinates as chemicals and biofuel additives. Efficient conversion of cheap and abundant glucose to alkyl levulinates over easily separated and regenerated solid catalyst is highly desirable. Here, the transformation of glucose to methyl levulinate (MLE) was studied over dual solid acid catalysts. The synergistic effect of solid Brønsted (B) acid and solid Lewis (L) acid was observed. A combined catalyst system consisting of both B acid and L acid was found to be more efficient for the production of MLE from glucose. 62% yield of MLE was given over the combined catalyst of SO 4 2− /ZrO 2 and Sn-Beta prepared by postsynthesis method at 170 °C for 24 h. The roles of L acid sites of SO 4 2− /ZrO 2 and Sn-Beta, and B acid sites of SO 4 2− /ZrO 2 were discussed in detail. Alternative biomass-derived carbohydrates also gave moderate to good yields of MLE. Recyclability studies indicated that the combined catalyst system can be reused without significant change in the yield of MLE, proving its easy recovery and thermal stability during regeneration.
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Nanoscale
·
2017
·Vol. 9
·期 32
·11806-11813
·
IF 7.367
T. M. Chen,X. J. Wu,J. X. Wang,G. W. Yang
As one of the transition metal dichalcogenide materials, WSe2 in the form of a few layers (nanosheets) have received much attention due to their unique physical, optical and electrical properties. Herein, we demonstrate that WSe2 nanosheets possess intrinsic enzyme mimic activity. Under acidic conditions, they exhibit pronounced peroxidase-like property. The Michaelis–Menten kinetics indicate that the catalytic activity of WSe2 nanosheets is comparable to that of horseradish peroxidase. Based on the color reaction, a platform of WSe2 nanosheets was constructed to detect glucose concentration and it showed high sensitivity and high selectivity, which means that WSe2 nanosheets with peroxidase-like property can be used to develop a highly sensitive and selective colorimetric method for glucose detection. Moreover, due to the electron-transferring and antioxidant properties of WSe2 few layers, the peroxidase-like catalysis is proposed. These findings pave the way for further application of WSe2 nanosheets in nano-biomedicine.
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INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Lan Wang,Xiaojiao Kang,Daocheng Pan
Assisted with polyethylenimine, 4.0 L of water-soluble AgInS2 quantum dots (AIS QDs) were successfully synthesized in an electric pressure cooker. As-prepared QDs exhibit yellow emission with a photoluminescence (PL) quantum yield up to 32%. The QDs also show excellent water/buffer stability. The highly luminescent AIS QDs are used to explore their dual-functional behavior: detection of hydrogen peroxide (H2O2)/glucose and cell imaging. The amino-functionalized AIS QDs show high sensitivity and specificity for H2O2 and glucose with detection limits of 0.42 and 0.90 μM, respectively. A linear correlation was established between PL intensity and concentration of H2O2 in the ranges of 0.5–10 μM and 10–300 μM, while the linear ranges were 1–10 μM and 10–1000 μM for detection of glucose. The AIS QDs reveal negligible cytotoxicity on HeLa cells. Furthermore, the luminescence of AIS QDs gives the function of optical imaging.
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CHEMICAL ENGINEERING JOURNAL
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2016
·
IF 5.31
Zhenzhen Yang,Wei Qi,Renliang Huang,Jie Fang,Rongxin Su,Zhimin He
Functionalized silica nanoparticles with strong acidity and different hydrophobicity were successfully synthesized by an alkali co-condensation method. The structure of the hydrophobic solid acids were characterized, and the catalytic properties were investigated in fructose dehydration to 5-hydroxymethylfurfural (5-HMF). Experiment results indicated that catalyst hydrophobicity has a positive influence on both 5-HMF yield and selectivity. The highest yield of 5-HMF (87%) with full conversion of fructose was obtained when the most hydrophobic solid acid (SiNP-SO 3 H-C 16 ) was used as the catalyst. The reason can be interpreted as the hydrophobic groups in the silica nanoparticles can effectively isolate SO 3 H groups with water molecules in the reaction system, and thus hinder the rehydration of 5-HMF, which is the main side-reaction in 5-HMF formation. Other important reaction parameters such as reaction medium, temperature, time and catalyst loading were also studied for fructose dehydration. Recycling and control experiments demonstrated the good reusability and stability of the functionalized silica nanoparticles. Furthermore, inulin was also used as a feedstock for 5-HMF production and gave a high 5-HMF yield of 65% in the catalysis of a moderate hydrophobic silica nanoparticle.
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ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Jin-Wen Liu,Ying Luo,Yu-Min Wang,Lu-Ying Duan,Jian-Hui Jiang,Ru-Qin Yu
Graphitic carbon nitride (g-C3N4) nanosheets, an emerging graphene-like carbon-based nanomaterial with high fluorescence and large specific surface areas, hold great potential for biosensor applications. Current g-C3N4 nanosheets based fluorescent biosensors majorly rely on single fluorescent intensity reading through fluorescence quenching interactions between the nanosheets and metal ions. Here we report for the first time the development of a novel g-C3N4 nanosheets-based ratiometric fluorescence sensing strategy for highly sensitive detection of H2O2 and glucose. With o-phenylenediamine (OPD) oxidized by H2O2 in the presence of horseradish peroxidase (HRP), the oxidization product can assemble on the g-C3N4 nanosheets through hydrogen bonding and π–π stacking, which effectively quenches the fluorescence of g-C3N4 while delivering a new emission peak. The ratiometric signal variations enable robust and sensitive detection of H2O2. On the basis of the glucose converting into H2O2 through the catalysis of glucose oxidase, the g-C3N4-based ratiometric fluorescence sensing platform is also exploited for glucose assay. The developed strategy is demonstrated to give a detection limit of 50 nM for H2O2 and 0.4 μM for glucose, at the same time, it has been successfully used for glucose levels detection in human serum. This strategy may provide a cost-efficient, robust, and high-throughput platform for detecting various species involving H2O2-generation reactions for biomedical applications.
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Journal of Energy Chemistry
·
2016
·
IF 2.322
Jun Zhang,Jinzhu Chen
A series of metal salt-modified carbon catalysts had been prepared to study the selective transformation of various carbohydrates into ethyl levulinate in an ethanol medium. The specific textural and chemical characteristics of prepared carbon samples were identified by Raman, XRD , XPS , NH 3 -TPD, FT-IR and nitrogen physisorption . Various parameters such as ethanol/water volume ratio, NaCl addition, reaction temperature, and catalyst dosage played a great role in ethyl levulinate production. A desirable ethyl levulinate yield of 58.0 mol% with a highest ROF (rate of ethyl levulinate formation per gram of catalyst per hour) value of 2148.3 µmol/(g cat ·h) was achieved at 468 K over FeCl 3 modified carbon catalyst with respect to fructose conversion. The recycling experiments revealed that the sulfonated carbon catalysts exhibited relatively satisfied activity and stability.
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JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2017
·Vol. 64
·期 7
·795-803
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IF 0.935
Junyu Lu,Lianqiang Wei,Dongmei Yao,Xiuju Yin,Hongfang Lai,Xiuxiang Huang
β-AgVO 3 nanorods have been demonstrated to exhibit intrinsic peroxidase-like activity. The oxidation of glucose can be catalyzed by glucose oxidase (GO x ) to generate H 2 O 2 in the presence of O 2 . The β-AgVO 3 nanorods can catalytically oxidize peroxidase substrates including o -phenylenediamine (OPD), 3,3′,5,5′-tetramethylbenzidine (TMB), and diammonium 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) by H 2 O 2 to produce typical color reactions: OPD from colorless to orange, TMB from colorless to blue, and ABTS from colorless to green. The catalyzed reaction by the β-AgVO 3 nanorods was found to follow the characteristic Michaelis–Menten kinetics. Compared with horseradish peroxidase and AgVO 3 nanobelts, β-AgVO 3 nanorods showed a higher affinity for TMB with a lower Michaelis–Menten constant ( K m ) value (0.04118 mM) at the optimal condition. Taking advantage of their high catalytic activity, the as-synthesized β-AgVO 3 nanorods were utilized to develop a colorimetric sensor for the determination of glucose. The linear range for glucose was 1.25–60 μM with the lower detection limit of 0.5 μM. The simple and sensitive GO x -β–AgVO 3 nanorods–TMB sensing system shows great promise for applications in the pharmaceutical, clinical, and biosensor detection of glucose.
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MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 8
·2369-2375
·
IF 4.831
Liu Xiangjian,Yang Wenxiu,Chen Lulu,Jia Jianbo
An electrochemical non-enzymatic glucose sensor based on copper nanorods (CuNRs) was developed. The CuNRs were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction spectroscopy, and X-ray photoelectron spectroscopy. The results display a layer of rough cuprous oxide that is formed on the surface of CuNRs. The CuNR- modified glassy carbon electrode exhibits an outstanding capability in terms of nonenzymatic sensing of glucose. The sensor displays high sensitivity (1490 μA•mM −1 •cm −2 ), fast response time (less than 5 s), a low detection limit of 8 nM (S/ N = 3), long term stability, and excellent anti-fouling ability. The sensor was applied to the detection of glucose in (spiked) human serum and in black ice tea, with relative standard deviations (for n = 6) of 1.7 % and 1.9 %, respectively.
The surface of Cu nanorods was covered with cuprous oxide, which increased the surface area of the nanorods and provided more catalytic active sites for the electro-oxidation of glucose. Good linearity and selectivity were obtained in glucose sensing.
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AICHE JOURNAL
·
2017
·Vol. 63
·期 11
·4920-4932
·
IF 2.836
Yunlei Zhang,Pei Jin,Meng Liu,Jianming Pan,Yongsheng Yan,Yao Chen,Qingang Xiong
In this work, a novel route to deconstruct cellulose into 5-hydroxymethylfurfural (HMF) by cascading enzymatic and chemical reactions is reported. For biocatalyst preparation, Fe 3 O 4 nanoparticles encapsulated SBA-15 with appropriate pore size was synthesized and utilized as magnetic scaffolds for the immobilization of cellulase. For chemical catalyst preparation, sulfated zirconium dioxide conformed monolayers were grafted on SBA-15 template to create thermally robust mesoporous catalysts with tunable solid basic/Lewis acid and Brønsted acid sites. Catalytic performance of biocatalyst and chemical catalyst was explored in the aqueous phase conversion of IL pretreated cellulose to glucose, and in the iPrOH/water solvent conversion of glucose to HMF conversion, respectively. After the optimization of reaction conditions, a sequential conversion of pretreated cellulose to glucose and glucose to HMF was performed, and 43.6% HMF yield can be obtained. The cascaded enzymatic and chemocatalytic reaction system demonstrates an effective and economically friendly process for biomass energy conservation. A novel route for green conversion of IL pretreated cellulose to 5-hydroxymethylfurfural (HMF) by cascading an enzymatic catalysis in an aqueous system with chemocatalysis in an iPrOH/water solvent mixture is reported. © 2017 American Institute of Chemical Engineers AIChE J , 2017
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Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Wenqin Wu,Beibei Yu,Huimin Wu,Shengfu Wang,Qinghua Xia,Yu Ding
Different phases of cobalt sulfides have been fabricated by one-pot hydrothermal method. Comparing all of the prepared materials, and the results revealed that CoS was the most conductive and could accelerate electron transfer. The CoS presented tremella-like and excellent catalytic activities towards hydrogen peroxide and glucose. The sensor based on CoS performed amperometric sensing of hydrogen peroxide in a linear range between 5.00 μM and 14.82 mM. Meanwhile, sensing of glucose with double-linear range, one is between 5.00 μM and 1.10 mM, the other is between 1.20 mM and 10.20 mM. These due to the fact that more and more intermediate species absorb onto electrode surface with increasing the concentration of glucose, which limit the following glucose oxidation. Furthermore, the hydrogen peroxide and glucose sensors based on tremella-like CoS also exhibited excellent selectivity, stability, and reproducibility. Thus, the sensor showed potential utilities in hydrogen peroxide and glucose detection.
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