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New Perspectives in Biosensors Technology and Applications - Most Downloaded Chapters. Edited by: Pier Andrea Serra. ISBN , Published.
Table of contents

Zheng, B.

Life Cycle Perspectives for Biosensors | SpringerLink

Li, Y. Vaddiraju, S. Carrascosa, L. Wen-Tso, L. Jianrong, C. Kim, T. Ibtisam, E.

Raman spectroscopy for Biosensor Development in early cancer diagnosis

Olapiriyakul, S. Ray, P. Gottschalk, F. Hankin, S. In this article, the length of the linker capture probe was studied for electron transfer enhancement from the ferrocene-motifs of immobilised molecules towards the electrode surface to obtain higher kinetics in the presence of thiolated molecular wires. The use of the right couple of capture probe linker and molecular wire has found to be beneficial as it helps to amplify eightfold the signal obtained.

Zaffino, R. Oligonucleotide probes functionalization of nanogap electrodes Electrophoresis , 38, 21 , Nanogap electrodes have attracted a lot of consideration as promising platform for molecular electronic and biomolecules detection. This is mainly for their higher aspect ratio, and because their electrical properties are easily accessed by current-voltage measurements. Since the strength of electrical fields in nanoscaled devices can reach high values, even at low voltages.

Here, we analyzed the effects induced by different methods of surface modification of nanogap electrodes, in test-voltage application, employed for the electrical detection of a desoxyribonucleic acid DNA target. Nanogap electrodes were functionalized with two antisymmetric oligo-probes designed to have 20 terminal bases complementary to the edges of the target, which after hybridization bridges the nanogap, closing the electrical circuit. Two methods of functionalization were studied for this purpose; a random self-assembling of a mixture of the two oligo-probes OPs used in the platform, and a selective method that controls the position of each OP at selected side of nanogap electrodes.

We used for this aim, the electrophoretic effect induced on negatively charged probes by the application of an external direct current voltage. The results obtained with both functionalization methods where characterized and compared in terms of electrode surface covering, calculated by using voltammetry analysis.

Moreover, we contrasted the electrical detection of a DNA target in the nanogap platform either in site-selective and in randomly assembled nanogap. According to our results, a denser, although not selective surface functionalization, is advantageous for such kind of applications. DNA hybridization was then detected by differential pulse voltammetry, evaluating the changes in the electrochemical properties of the polymer produced by the recognition event.

A limit of detection of 0.

1. Introduction

These results are promising for the development of label-free and reagentless DNA hybridization sensors based on conducting polymeric substrates. Biosensors can be easily prepared using any DNA sequence containing an alkyne moiety. The data presented here reveal the potential of this DNA sensor for diagnostic applications in the screening of diseases, such as "Hepatitis C", and genetic mutations. Pardo, W. Signal enhancement in ultraflat electrochemical DNA biosensors Electrophoresis , 36, 16 , The ability of holding back the undesired molecules, but at the same time to provide the right distribution and orientation of the bioreceptors, are critical targets to reach an efficient hybridization and enhanced detection in electrochemical DNA biosensors.

The main actors responsible of these key functions are the substrate of the sensor and the interface auto-assembled on it. In this paper we present the annealing as a method to improve commercial gold evaporated substrates for biosensor applications. The restructuring of granulated gold surface by means of annealing heating treatment leads to the formation of ultraflat gold lamellar terraces.

The formation of terraces was characterized with scanning tunneling microscopy and optical interferometry. The performance of the sensor sensitivity on granular substrates and ultraflat substrates was studied, concerning the orientation and surface coverage of the bioreceptor interface applied in electrochemical biosensor.

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The hybridization efficiency of ferrocene-labeled DNA amplified by PCR was characterized with surface plasmon resonance and electrochemistry. The experimental results demonstrate that annealing process, positive influence on optical and voltammetric readings, due to a structured organization of the bioreceptors on the flat substrate, gaining more efficient immobilization and DNA hybridization. The results suggest the annealing as a powerful tool for improving gold substrates in biosensors applications. Nanomedicine against malaria Current Medicinal Chemistry , 21, 5 , Malaria is arguably one of the main medical concerns worldwide because of the numbers of people affected, the severity of the disease and the complexity of the life cycle of its causative agent, the protist Plasmodium sp.

The clinical, social and economic burden of malaria has led for the last years to several waves of serious efforts to reach its control and eventual eradication, without success to this day. With the advent of nanoscience, renewed hopes have appeared of finally obtaining the long sought-after magic bullet against malaria in the form of a nanovector for the targeted delivery of antimalarial drugs exclusively to Plasmodium-infected cells.

Different types of encapsulating structure, targeting molecule, and antimalarial compound will be discussed for the assembly of Trojan horse nanocapsules capable of targeting with complete specificity diseased cells and of delivering inside them their antimalarial cargo with the objective of eliminating the parasite with a single dose. Nanotechnology can also be applied to the discovery of new antimalarials through single-molecule manipulation approaches for the identification of novel drugs targeting essential molecular components of the parasite. Finally, methods for the diagnosis of malaria can benefit from nanotools applied to the design of microfluidic-based devices for the accurate identification of the parasite's strain, its precise infective load, and the relative content of the different stages of its life cycle, whose knowledge is essential for the administration of adequate therapies.

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The benefits and drawbacks of these nanosystems will be considered in different possible scenarios, including cost-related issues that might be hampering the development of nanotechnology-based medicines against malaria with the dubious argument that they are too expensive to be used in developing areas. Label-free detection of DNA hybridization and single point mutations in a nano-gap biosensor Nanotechnology 25, 10 , 8.

We describe a conductance-based biosensor that exploits DNA-mediated long-range electron transport for the label-free and direct electrical detection of DNA hybridization. This biosensor platform comprises an array of vertical nano-gap biosensors made of gold and fabricated through standard photolithography combined with focused ion beam lithography. The nano-gap walls are covalently modified with short, anti-symmetric thiolated DNA probes, which are terminated by 19 bases complementary to both the ends of a target DNA strand.

The nano-gaps are separated by a distance of 50nm, which was adjusted to fit the length of the DNA target plus the DNA probes. The nano-biosensor shows high specificity in the discrimination of base-pair mismatching and does not require signal indicators or enhancing molecules. The design of the biosensor platform is applicable for multiplexed detection in a straightforward manner. The platform is well-suited to mass production, point-of-care diagnostics, and wide-scale DNA analysis applications.

Juanola-Feliu, E. Design of a customized multipurpose nano-enabled implantable system for in-vivo theranostics Sensors 14, 10 , The first part of this paper reviews the current development and key issues on implantable multi-sensor devices for in vivo theranostics.

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Afterwards, the authors propose an innovative biomedical multisensory system for in vivo biomarker monitoring that could be suitable for customized theranostics applications. Therefore, this article deals with new research and market challenges of implantable sensor devices, from the point of view of the pervasive system, and time-to-market. The remote clinical monitoring approach introduced in this paper could be based on an array of biosensors to extract information from the patient. A key contribution of the authors is that the general architecture introduced in this paper would require minor modifications for the final customized bio-implantable medical device.

Nano-enabled implantable device for glucose monitoring Implantable Bioelectronics ed. KGaA Weinheim, Germany , Molecular probes and switches for functional analysis of receptors, ion channels and synaptic networks Frontiers in Molecular Neuroscience 6, Article 48 , Keywords: Optogenetics , Genetically encoded biosensors , Chloride imaging , pH monitoring , Intracellular Ca , Optopharmacology , Photochromic ligands , Photoswitchable tethered ligands. Optical gratings coated with thin Si3N4 layer for efficient immunosensing by optical waveguide lightmode spectroscopy Biosensors , 2, 2 , A thin layer of 10 nm of transparent silicon nitride was deposited on commercial optical gratings by means of sputtering.

The quality of the layer was tested by x-ray photoelectron spectroscopy and atomic force microscopy. As a proof of concept, the sensors were successfully tested with OWLS by monitoring the concentration dependence on the detection of an antibody-protein pair. The potential of the Si3N4 as functional layer in a real-time biosensor opens new ways for the integration of optical waveguides with microelectronics. Supports Open Access.

Life Cycle Perspectives for Biosensors

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    Yang Song Yanan Luo Most Downloaded Articles The most downloaded articles from Biosensors and Bioelectronics in the last 90 days.