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https://www.readbyqxmd.com/read/28238262/a-cell-free-protein-synthesis-approach-to-biosensing-htrb-specific-endocrine-disruptors
#1
Amin S M Salehi, Miriam J Shakalli Tang, Mark Thomas Smith, Jeremy M Hunt, Robert A Law, David W Wood, Bradley Charles Bundy
Here we introduce a Rapid Adaptable Portable In-vitro Detection biosensor platform (RAPID) for detecting ligands that interact with NHRs. The RAPID platform can be adapted for field use, allowing rapid evaluation of EDC presence or absence in environmental samples, and could also be applied for drug screening. The biosensor is based on an engineered, allosterically-activated fusion protein, which contains the ligand-binding domain (LBD) from a target NHR (human thyroid receptor in this work). In vitro expression of this protein using cell-free protein synthesis (CFPS) technology in the presence of an EDC leads to activation of a reporter enzyme, reported through a straightforward colorimetric assay output...
February 26, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28238132/volumetric-bar-chart-chips-for-biosensing
#2
Yujun Song, Ying Li, Lidong Qin
The volumetric bar-chart chip (V-Chip) is a microfluidics-based, point-of-care (POC) device for the multiplexed and quantitative measurement of biomarkers. Volumetric readouts, based on the measurement of oxygen generated by a reaction between catalase and hydrogen peroxide, allow instant visual quantitation of target biomarkers and provide visualized bar charts without any assistance from instruments and without the need for data processing or graphics plotting. V-Chip shows potential capabilities in POC and personalized diagnostics; for instance, it can be utilized for making high-throughput, multiplexed, and quantitative measurements...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28238130/preparation-of-magnetic-nanoparticles-for-biomedical-applications
#3
Xiaolian Sun, Shouheng Sun
Magnetic nanoparticles have obtained great attention in the field of biomedicine in recent years owing to their excellent biocompatibility, unique magnetic properties, and ease of functionalization. Potential applications for functionalized magnetic nanoparticles span biomedical imaging, treatment via magnetic hyperthermia, drug delivery, and biosensing. This chapter provides detailed procedures for the synthesis, PEGylation, and bioconjugation of monodispersed Fe3O4 nanoparticles, hollow Fe3O4 nanoparticles, porous hollow Fe3O4 nanoparticles, and dumbbell-like Au-Fe3O4 nanoparticles...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28229174/characterization-of-the-specific-interaction-between-the-dna-aptamer-sgc8c-and-protein-tyrosine-kinase-7-receptors-at-the-surface-of-t-cells-by-biosensing-afm
#4
Michael Leitner, Alexandra Poturnayova, Constanze Lamprecht, Sabine Weich, Maja Snejdarkova, Ivana Karpisova, Tibor Hianik, Andreas Ebner
We studied the interaction of the specific DNA aptamer sgc8c immobilized at the AFM tip with its corresponding receptor, the protein tyrosine kinase-7 (PTK7) embedded in the membrane of acute lymphoblastic leukemia (ALL) cells (Jurkat T-cells). Performing single molecule force spectroscopy (SMFS) experiments, we showed that the aptamer sgc8c bound with high probability (38.3 ± 7.48%) and high specificity to PTK7, as demonstrated by receptor blocking experiments and through comparison with the binding behavior of a nonspecific aptamer...
February 22, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28226932/novel-refractive-index-biosensing-of-microcontact-printed-molecules-on-lithium-niobate
#5
Nikhil Bhalla, Shivani Sathish, Amy Q Shen, Nikhil Bhalla, Shivani Sathish, Amy Q Shen, Shivani Sathish, Amy Q Shen, Nikhil Bhalla
This work demonstrates, for the first time, the use of lithium niobate as a biosensor that detects local refractive index changes triggered by the presence of biomolecules on its surface. The sensitivity of the sensor was found to be 242±16 nm/RIU. As a case study, we immobilized proteins (IgG antibodies) using micro-contact printing to demonstrate sensing capabilities of the device. The validated proof of concept lays a foundation for developing lithium niobate based novel optical biosensors.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226497/simulations-and-design-of-microfabricated-interdigitated-electrodes-for-use-in-a-gold-nanoparticle-enhanced-biosensor
#6
Peter Hermansen, Scott MacKay, David Wishart, Jie Chen, Peter Hermansen, Scott MacKay, David Wishart, Jie Chen, David Wishart, Peter Hermansen, Scott MacKay, Jie Chen
Microfabricated interdigitated electrode chips have been designed for use in a unique gold-nanoparticle based biosensor system. The use of these electrodes will allow for simple, accurate, inexpensive, and portable biosensing, with potential applications in diagnostics, medical research, and environmental testing. To determine the optimal design for these electrodes, finite element analysis simulations were carried out using COMSOL Multiphysics software. The results of these simulations determined some of the optimal design parameters for microfabricating interdigitated electrodes as well as predicting the effects of different electrode materials...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226291/cell-free-synthetic-biology-for-environmental-sensing-and-remediation
#7
REVIEW
David K Karig
The fields of biosensing and bioremediation leverage the phenomenal array of sensing and metabolic capabilities offered by natural microbes. Synthetic biology provides tools for transforming these fields through complex integration of natural and novel biological components to achieve sophisticated sensing, regulation, and metabolic function. However, the majority of synthetic biology efforts are conducted in living cells, and concerns over releasing genetically modified organisms constitute a key barrier to environmental applications...
February 19, 2017: Current Opinion in Biotechnology
https://www.readbyqxmd.com/read/28225598/novel-aptasensor-platform-based-on-ratiometric-surface-enhanced-raman-spectroscopy
#8
Yan Wu, Fubing Xiao, Zhaoyang Wu, Ruqin Yu
A novel aptasensor platform has been developed for quantitative detection of adenosine triphosphate (ATP) based on a ratiometric surface-enhanced Raman scattering (SERS) strategy. The thiolated 3'-Rox-labeled complementary DNA (cDNA) is first immobilized on the gold nanoparticle (AuNP) surface and then hybridizes with the 3'-Cy5-labeled ATP-binding aptamer probe (Cy5-aptamer) to form a rigid double-stranded DNA (dsDNA), in which the Cy5 and Rox Raman labels are used to produce the ratiometric Raman signals...
February 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28224905/emerging-trends-in-biosensing-using-stripping-voltammetric-detection-of-metal-containing-nanolabels-a-review
#9
REVIEW
Christos Kokkinos, Anastasios Economou
Over the last years, nanomaterials have found many applications in the development of electrochemical biosensors. Among other functions, metal nanoparticles (NPs) and quantum dots (QDs) (semiconducting nanocrystals composed of metal salts) are increasingly being used as voltammetric labels in affinity biosensing. Labeling is based on the attachment of the label(s) on the target biomolecules or on a biorecognition reporting probe. After an appropriate specific affinity interaction between the target and the reporting probe, the metallic nanolabels are converted to the respective cations which are quantified by a voltammetric technique...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28223074/recent-advances-in-biomedical-applications-of-fluorescent-gold-nanoclusters
#10
REVIEW
Youkun Zheng, Lanmei Lai, Weiwei Liu, Hui Jiang, Xuemei Wang
Fluorescent gold nanoclusters (AuNCs) are emerging as novel fluorescent materials and have attracted more and more attention in the field of biolabeling, biosensing, bioimaging and targeted cancer treatment because of their unusual physicochemical properties, such as long fluorescence lifetime, ultrasmall size, large Stokes shift, strong photoluminescence, as well as excellent biocompatibility and photostability. Recently, significant efforts have been committed to the preparation, functionalization and biomedical application studies of fluorescent AuNCs...
February 16, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28222780/advanced-biosensors-for-detection-of-pathogens-related-to-livestock-and-poultry
#11
REVIEW
Jasmina Vidic, Marisa Manzano, Chung-Ming Chang, Nicole Jaffrezic-Renault
Infectious animal diseases caused by pathogenic microorganisms such as bacteria and viruses threaten the health and well-being of wildlife, livestock, and human populations, limit productivity and increase significantly economic losses to each sector. The pathogen detection is an important step for the diagnostics, successful treatment of animal infection diseases and control management in farms and field conditions. Current techniques employed to diagnose pathogens in livestock and poultry include classical plate-based methods and conventional biochemical methods as enzyme-linked immunosorbent assays (ELISA)...
February 21, 2017: Veterinary Research
https://www.readbyqxmd.com/read/28222368/direct-and-label-free-influenza-virus-detection-based-on-multisite-binding-to-sialic-acid-receptors
#12
Yukichi Horiguchi, Tatsuro Goda, Akira Matsumoto, Hiroaki Takeuchi, Shoji Yamaoka, Yuji Miyahara
A system to discriminate human or avian influenza A remains a highly sought-after tool for prevention of influenza pandemics in humans. Selective binding of the influenza A viral hemagglutinin (HA) to specific sialic acid (SA) receptors (Neu5Acα(2-6)Gal in humans, Neu5Acα(2-3)Gal in birds) is determined by the genotype of the HA and neuraminidase (NA) segments, making it one of the key characteristics that distinguishes human or avian influenza A virus. Here we demonstrate the direct detection of whole H1N1 influenza A virus using 6'-sialyllactose (Neu5Acα(2-6)Galβ(1-4)Glc, 6SL)-immobilized gold electrodes as biosensing surfaces...
February 16, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28221715/hybrid-nanoparticle-pyramids-for-intracellular-dual-micrornas-biosensing-and-bioimaging
#13
Si Li, Liguang Xu, Maozhong Sun, Xiaoling Wu, Liqiang Liu, Hua Kuang, Chuanlai Xu
This study strategically fabricates multifunctional nanopyramids to allow the ultrasensitive quantification of dual microRNAs (miR-203(b) and miR-21) in living cells and their responsive bioimaging in vivo. The nanopyramids, composed of Au-Cu9 S5 nanoparticles (NPs), upconversion NPs (UCNPs), and Ag2 S NPs, emit two luminescent signals simultaneously with excitation at 808 nm, arising from the UCNPs at 541 nm in the visible region and from the Ag2 S NPs at 1227 nm in the second window of near-infrared (NIR-II) region...
February 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28220916/magnetic-digital-microfluidics-a-review
#14
REVIEW
Yi Zhang, Nam-Trung Nguyen
A digital microfluidic platform manipulates droplets on an open surface. Magnetic digital microfluidics utilizes magnetic forces for actuation and offers unique advantages compared to other digital microfluidic platforms. First, the magnetic particles used in magnetic digital microfluidics have multiple functions. In addition to serving as actuators, they also provide a functional solid substrate for molecule binding, which enables a wide range of applications in molecular diagnostics and immunodiagnostics...
February 21, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28214748/electrochemical-monitoring-of-biointeraction-by-graphene-based-material-modified-pencil-graphite-electrode
#15
Ece Eksin, Erhan Zor, Arzum Erdem, Haluk Bingol
Recently, the low-cost effective biosensing systems based on advanced nanomaterials have received a key attention for development of novel assays for rapid and sequence-specific nucleic acid detection. The electrochemical biosensor based on reduced graphene oxide (rGO) modified disposable pencil graphite electrodes (PGEs) were developed herein for electrochemical monitoring of DNA, and also for monitoring of biointeraction occurred between anticancer drug, Daunorubicin (DNR), and DNA. First, rGO was synthesized chemically and characterized by using UV-Vis, TGA, FT-IR, Raman Spectroscopy and SEM techniques...
February 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28214671/atp-mediated-intrinsic-peroxidase-like-activity-of-fe3o4-based-nanozyme-one-step-detection-of-blood-glucose-at-physiological-ph
#16
N V Srikanth Vallabani, Ajay S Karakoti, Sanjay Singh
Fe3O4 nanoparticles (Fe3O4 NPs), demonstrating peroxidase-like activity has garnered attention in the detection of several biomolecules, therefore, emerged as an excellent nano-biosensing agent. The intrinsic peroxidase-like activity of Fe3O4 NPs at acidic pH is the fundamental action driving the oxidation of substrates like TMB, resulting in a colorimetric product formation used in the detection of biomolecules. Hence, the detection sensitivity essentially depends on the ability of oxidation by Fe3O4 NPs in presence of H2O2...
February 9, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28213224/ordered-titanium-templates-functionalized-by-gold-films-for-biosensing-applications-towards-non-enzymatic-glucose-detection
#17
Katarzyna Grochowska, Mariusz Szkoda, Jakub Karczewski, Gerard Śliwiński, Katarzyna Siuzdak
Recently, metal nanostructures evoke much interest due to application potential in highly sensitive detectors in biochemistry and medical diagnostics. In this work we report on preparation and characteristics of thin (1-100nm) Au films deposited onto highly ordered structured titanium templates for SERS (Surface Enhanced Raman Spectroscopy) and electrochemical sensing. The Ti templates are formed by selective removal of TiO2 nanotubes out of as-anodized titanium substrate. The surface of the obtained material reproduce precisely the bottom layer of the nanotubes and consists of a uniformly distributed dimples with diameter of ~100nm...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212282/collagen-gold-nanoparticle-conjugates-for-versatile-biosensing
#18
Sarah Unser, Samuel Holcomb, ReJeana Cary, Laura Sagle
Integration of noble metal nanoparticles with proteins offers promising potential to create a wide variety of biosensors that possess both improved selectivity and versatility. The multitude of functionalities that proteins offer coupled with the unique optical properties of noble metal nanoparticles can allow for the realization of simple, colorimetric sensors for a significantly larger range of targets. Herein, we integrate the structural protein collagen with 10 nm gold nanoparticles to develop a protein-nanoparticle conjugate which possess the functionality of the protein with the desired colorimetric properties of the nanoparticles...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28211673/capillary-microfluidics-assembled-virus-like-particle-bio-nano-receptor-interfaces-for-label-free-biosensing
#19
Faheng Zang, Konstantinos Gerasopoulos, Adam D Brown, James N Culver, Reza Ghodssi
In this paper, a capillary microfluidics-integrated sensor system is developed for rapid assembly of bionanoreceptor interfaces on-chip and label-free biosensing. Genetically engineered Tobacco mosaic virus (TMV) virus-like particle (VLP), displaying thousands copies of identical receptor peptides FLAG-tags, are utilized as nanoceptors for antibody sensing. Controlled and accelerated assembly of VLP receptor layer on impedance sensor has been achieved using capillary effect and surface evaporation from an open-channel capillary microfluidic system...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28208642/photoluminescent-gold-nanoclusters-in-cancer-cells-cellular-uptake-toxicity-and-generation-of-reactive-oxygen-species
#20
Marija Matulionyte, Dominyka Dapkute, Laima Budenaite, Greta Jarockyte, Ricardas Rotomskis
In recent years, photoluminescent gold nanoclusters have attracted considerable interest in both fundamental biomedical research and practical applications. Due to their ultrasmall size, unique molecule-like optical properties, and facile synthesis gold nanoclusters have been considered very promising photoluminescent agents for biosensing, bioimaging, and targeted therapy. Yet, interaction of such ultra-small nanoclusters with cells and other biological objects remains poorly understood. Therefore, the assessment of the biocompatibility and potential toxicity of gold nanoclusters is of major importance before their clinical application...
February 10, 2017: International Journal of Molecular Sciences
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