A new issue of this journal has just been published. To see abstracts of the papers it contains (with links through to the full papers) click here:
Selected papers from the latest issue:
High-performance bioanode based on the composite of CNTs-immobilized mediator and silk film-immobilized glucose oxidase for glucose/O2biofuel cells
05 November 2011, 21:02:03
Publication year: 2011
Source: Biosensors and Bioelectronics, Available online 4 November 2011
Juan Liu, Xiaohua Zhang, Haili Pang, Bo Liu, Qiong Zou, ...
A high-performance bioanode based on the composite of carbon nanotubes (CNTs)-immobilized mediator and silk film (SF)-immobilized glucose oxidase (GOD) was developed for glucose/O2biofuel cell (BFC). Ferrocenecarboxaldehyde (Fc) was used as the mediator and covalently immobilized on the ethylenediamine (EDA)-functionalized CNTs (CNTs-EDA). GOD was cross-linked on the SF with glutaraldehyde (GA) as the cross-linking agent. The resulting electrode (CNTs-Fc/SF-GOD/glassy carbon (GC) electrode) exhibited good catalytic activity towards glucose oxidation and excellent stability. For the assembled glucose/O2BFC with the CNTs-Fc/SF-GOD/GC electrode as the bioanode and a commercialE-TEKPt/C modified GC electrode as the cathode, the open circuit potential is 0.48 V and the maximum power density of 50.70 μWcmcan be achieved at 0.15 V.
Source: Biosensors and Bioelectronics, Available online 4 November 2011
Juan Liu, Xiaohua Zhang, Haili Pang, Bo Liu, Qiong Zou, ...
A high-performance bioanode based on the composite of carbon nanotubes (CNTs)-immobilized mediator and silk film (SF)-immobilized glucose oxidase (GOD) was developed for glucose/O2biofuel cell (BFC). Ferrocenecarboxaldehyde (Fc) was used as the mediator and covalently immobilized on the ethylenediamine (EDA)-functionalized CNTs (CNTs-EDA). GOD was cross-linked on the SF with glutaraldehyde (GA) as the cross-linking agent. The resulting electrode (CNTs-Fc/SF-GOD/glassy carbon (GC) electrode) exhibited good catalytic activity towards glucose oxidation and excellent stability. For the assembled glucose/O2BFC with the CNTs-Fc/SF-GOD/GC electrode as the bioanode and a commercialE-TEKPt/C modified GC electrode as the cathode, the open circuit potential is 0.48 V and the maximum power density of 50.70 μWcmcan be achieved at 0.15 V.
Highlights
► A high-performance bioanode was developed for glucose/O2biofuel cell (BFC) ► A composite of CNTs-immobilized mediator and silk film-immobilized glucose oxidase. ► The bioanode exhibited good catalytic activity and excellent stability. ► BFCs with open circuit potential of 0.48 V and maximum power density of 50.70 μWcmQuantum Dots-Based Multifunctional Dendritic Superstructure for Amplified Electrochemiluminescence Detection of ATP
05 November 2011, 21:02:03
Publication year: 2011
Source: Biosensors and Bioelectronics, Available online 4 November 2011
Guifen Jie, Jinxin Yuan, Jian Zhang
A novel multifunctional dendrimeric CdSe-CdS-Quantum dots (QDs) hybrid superstructure with highly intense electrochemiluminescence (ECL), fluorescence and excellent magnetic property is prepared for the first time, and successfully applied to amplified ECL assays of ATP using DNA cycle amplification technique. The magnetic nanoparticles (MNPs) were firstly assembled with unique dendrimer nanoclusters (NCs), then large numbers of QDs were labeled onto the dendrimer NCs, the superstructure exhibits highly enhanced ECL and fluorescence than the pure QDs. Remarkable ECL quenching of the nanocomposites by gold nanoparticles (GNPs) was observed, based on which a novel strategy for highly sensitive ATP detection was developed by cycle amplification technique. Furthermore, the nanocomposites with excellent magnetic properties can be easily labeled, separated and immobilized onto a magnetic electrode. In particular, all the procedures such as linking GNPs, sensing target and DNA cycle amplification were directly accomplished on the nanocomposites, which is more rapid, convenient, complete and has better reproducibility than the conventional methods on electrode. To the best of our knowledge, this is the first report on the multifunctional QDs superstructure with highly intense ECL, fluorescence, excellent magnetism and its ECL biosensing, which opens a new pathway for developing QD-based nanocomposites for broad applications in ECL bioassays and optical imaging.
Source: Biosensors and Bioelectronics, Available online 4 November 2011
Guifen Jie, Jinxin Yuan, Jian Zhang
A novel multifunctional dendrimeric CdSe-CdS-Quantum dots (QDs) hybrid superstructure with highly intense electrochemiluminescence (ECL), fluorescence and excellent magnetic property is prepared for the first time, and successfully applied to amplified ECL assays of ATP using DNA cycle amplification technique. The magnetic nanoparticles (MNPs) were firstly assembled with unique dendrimer nanoclusters (NCs), then large numbers of QDs were labeled onto the dendrimer NCs, the superstructure exhibits highly enhanced ECL and fluorescence than the pure QDs. Remarkable ECL quenching of the nanocomposites by gold nanoparticles (GNPs) was observed, based on which a novel strategy for highly sensitive ATP detection was developed by cycle amplification technique. Furthermore, the nanocomposites with excellent magnetic properties can be easily labeled, separated and immobilized onto a magnetic electrode. In particular, all the procedures such as linking GNPs, sensing target and DNA cycle amplification were directly accomplished on the nanocomposites, which is more rapid, convenient, complete and has better reproducibility than the conventional methods on electrode. To the best of our knowledge, this is the first report on the multifunctional QDs superstructure with highly intense ECL, fluorescence, excellent magnetism and its ECL biosensing, which opens a new pathway for developing QD-based nanocomposites for broad applications in ECL bioassays and optical imaging.
Biosensing using dynamic-mode cantilever sensors: A review
05 November 2011, 21:02:03
Publication year: 2011
Source: Biosensors and Bioelectronics, Available online 4 November 2011
Blake N. Johnson, Raj Mutharasan
Current progress on the use of dynamic-mode cantilever sensors for biosensing applications is critically reviewed. We summarize their use in biosensing applications to date with focus given to: cantilever size (milli-, micro-, and nano-cantilevers), their geometry, and material used in fabrication. The review also addresses techniques investigated for both exciting and measuring cantilever resonance in various environments (vacuum, air, and liquid). Biological targets that have been detected to date are summarized with attention to bio-recognition chemistry, surface functionalization method, limit of detection, resonant frequency mode type, and resonant frequency measurement scheme. Applications published to date are summarized in a comprehensive table with description of the aforementioned details including comparison of sensitivities. Further, the general theory of cantilever resonance is discussed including fluid-structure interaction and its dependence on the Reynolds number for Newtonian fluids. The review covers designs with frequencies ranging from ∼ 1 kHz to 10 MHz and cantilever size ranging from millimeters to nanometers. We conclude by identifying areas that require further investigation.
Source: Biosensors and Bioelectronics, Available online 4 November 2011
Blake N. Johnson, Raj Mutharasan
Current progress on the use of dynamic-mode cantilever sensors for biosensing applications is critically reviewed. We summarize their use in biosensing applications to date with focus given to: cantilever size (milli-, micro-, and nano-cantilevers), their geometry, and material used in fabrication. The review also addresses techniques investigated for both exciting and measuring cantilever resonance in various environments (vacuum, air, and liquid). Biological targets that have been detected to date are summarized with attention to bio-recognition chemistry, surface functionalization method, limit of detection, resonant frequency mode type, and resonant frequency measurement scheme. Applications published to date are summarized in a comprehensive table with description of the aforementioned details including comparison of sensitivities. Further, the general theory of cantilever resonance is discussed including fluid-structure interaction and its dependence on the Reynolds number for Newtonian fluids. The review covers designs with frequencies ranging from ∼ 1 kHz to 10 MHz and cantilever size ranging from millimeters to nanometers. We conclude by identifying areas that require further investigation.
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