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https://www.readbyqxmd.com/read/29149993/label-free-determination-of-prostate-specific-membrane-antigen-in-human-whole-blood-at-nanomolar-levels-by-magnetically-assisted-surface-enhanced-raman-spectroscopy
#1
Zuzana Chaloupková, Anna Balzerová, Jitka Bařinková, Zdenka Medříková, Pavel Šácha, Petr Beneš, Václav Ranc, Jan Konvalinka, Radek Zbořil
Prostate cancer is one of the most common cancers among men and can in its later stages cause serious medical problems. Due to the limited suitability of current diagnostic biochemical markers, new biomarkers for the detection of prostate cancer are highly sought after. An ideal biomarker should serve as a reliable prognostic marker, be applicable for early diagnosis, and be applicable for monitoring of therapeutic response. One potential candidate is glutamate carboxypeptidase II (GCPII), also known as prostate specific membrane antigen (PSMA), which has a promising role for direct imaging...
January 2, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29149830/diagnostic-devices-for-circulating-biomarkers-detection-and-quantification
#2
Chiara Bedin, Sara Crotti, Ennio Tasciotti, Marco Agostini
Nowadays, fast and sensitive methods for biomarkers detection exist, but the performance of most of them still rely in centralized laboratory testing. The development of small, fast and simple to use medical device that can help in making diagnosis accurate and with low-invasiveness is now a major challenge for nanotechnology. To develop diagnostic devices for cancer detection, nanomaterials-based systems have significant advantages over current conventional approaches in terms of simplicity, sensitivity, specificity and rapidity...
November 16, 2017: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29144732/ratiometric-detection-of-intracellular-lysine-and-ph-with-one-pot-synthesized-dual-emissive-carbon-dots
#3
Wei Song, Wenxiu Duan, Yinghua Liu, Zhongju Ye, Yonglei Chen, Hongli Chen, Shengda Qi, Jiang Wu, Dan Liu, Lehui Xiao, Cuiling Ren, Xingguo Chen
Recently, the development of new fluorescent probes for the ratiometric detection of target objects inside living cells has received great attention. Normally, the preparation, modification as well as conjugation procedures of these probes are complicated. On this basis, great efforts have been paid to establish convenient method for the preparation of dual emissive nanosensor. In this work, a functional dual emissive carbon dots (dCDs) was prepared by a one-pot hydrothermal carbonization method. The dCDs exhibits two distinctive fluorescence emission peaks at 440 and 624 nm with the excitation at 380 nm...
November 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29140078/molecular-recognition-and-immobilization-of-ligand-conjugated-redox-responsive-polymer-nanocontainers
#4
Wilke De Vries, Matthias Tesch, Armido Studer, Bart Jan Ravoo
We present the preparation of ligand conjugated redox-responsive polymer nanocontainers by the supramolecular decoration of cyclodextrin vesicles with a thin redox-cleavable polymer shell that displays molecular recognition units on its surface. Two widely different recognition motifs (mannose-Concanavalin A and biotin-streptavidin) are compared and the impact of ligand density is studied using aggregation assays, dynamic light scattering, and a fluorometric quantification of ligands. Microcontact printing is used to prepare streptavidin-patterned surfaces and the specific immobilization of biotin conjugated nanocontainers is demonstrated...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29136914/copper-sulfide-nanoplates-as-nanosensors-for-fast-sensitive-and-selective-detection-of-dna
#5
Dewen Wang, Qun Li, Zhicai Xing, Xiurong Yang
The present communication reports on a novel high-sensitivity DNA sensor based on cooper sulfide nanoplates (CuS NPs). The CuS NPs are successfully synthesized through a mild one-step hydrothermal method. As an efficient nanosensor for the fluorescent detection of DNA, the CuS NPs possess high sensitivity and selectivity with a detection limit of 25pM.
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29119168/nanowire-sensors-monitor-bacterial-growth-kinetics-and-response-to-antibiotics
#6
B Ibarlucea, T Rim, C K Baek, J A G M de Visser, L Baraban, G Cuniberti
Miniaturized and cost-efficient methods aiming at high throughput analysis of microbes are of great importance for the surveillance and control of infectious diseases and the related issue of antimicrobial resistance. Here we demonstrate a miniature nanosensor based on a honeycomb-patterned silicon nanowire field effect transistor (FET) capable of detection of bacterial growth and antibiotic response in microbiologically relevant nutrient media. We determine the growth kinetics and metabolic state of Escherichia coli cells in undiluted media via the quantification of changes in the source-drain current caused by varying pH values...
November 9, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/29115822/single-quantum-dot-based-nanosensor-for-sensitive-detection-of-o-glcnac-transferase-activity
#7
Juan Hu, Yueying Li, Ying Li, Bo Tang, Chun-Yang Zhang
Protein glycosylation is a ubiquitous post-translational modification that plays crucial roles in modulating biological recognition events in development and physiology. Human O-GlcNAc transferase (OGT) is an intracellular enzyme responsible for O-linked N-acetylglucosamine (O-GlcNAc) glycosylation, and the deregulation of OGT activity occurs in cancer, diabetes, and neurodegenerative disease. Here we develop a single quantum dot (QD)-based nanosensor for sensitive OGT assay. We design a Cy5/biotin-modified peptide with a serine hydroxyl group for sensing OGT and a protease site adjacent to the glycosylation site for proteinase cleavage, with a universal nonradioactive UDP-GlcNAc as the sugar donor and a Cy5/biotin-modified peptide as the substrate...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29111679/recombinant-protein-polymers-for-colloidal-stabilization-and-improvement-of-cellular-uptake-of-diamond-nanosensors
#8
Tingting Zheng, Felipe Perona Martínez, Ingeborg Maria Storm, Wolf Rombouts, Joris Sprakel, Romana Schirhagl, Renko de Vries
Fluorescent nanodiamonds are gaining increasing attention as fluorescent labels in biology in view of the fact that they are essentially nontoxic, do not bleach, and can be used as nanoscale sensors for various physical and chemical properties. To fully realize the nanosensing potential of nanodiamonds in biological applications, two problems need to be addressed: their limited colloidal stability, especially in the presence of salts, and their limited ability to be taken up by cells. We show that the physical adsorption of a suitably designed recombinant polypeptide can address both the colloidal stability problem and the problem of the limited uptake of nanodiamonds by cells in a very straightforward way, while preserving both their spectroscopic properties and their excellent biocompatibility...
November 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29108565/analytical-nanoscience-and-nanotechnology-where-we-are-and-where-we-are-heading
#9
María Laura Soriano, Mohammed Zougagh, Miguel Valcárcel, Ángel Ríos
The main aim of this paper is to offer an objective and critical overview of the situation and trends in Analytical Nanoscience and Nanotechnology (AN&N), which is an important break point in the evolution of Analytical Chemistry in the XXI century as they were computers and instruments in the second half of XX century. The first part of this overview is devoted to provide a general approach to AN&N by describing the state of the art of this recent topic, being the importance of it also emphasized. Secondly, particular but very relevant trends in this topic are outlined: the analysis of the nanoworld, the so "third way" in AN&N, the growing importance of bioanalysis, the evaluation of both nanosensors and nanosorbents, the impact of AN&N in bioimaging and in nanotoxicological studies, as well as the crucial importance of reliability of the nanotechnological processes and results for solving real analytical problems in the frame of Social Responsibility (SR) of science and technology...
January 15, 2018: Talanta
https://www.readbyqxmd.com/read/29106040/the-effect-of-temporal-manipulation-of-tgf%C3%AE-3-and-fgf2-on-the-derivation-of-proliferative-chondrocytes-from-mensenchymal-stem-cells-a-study-monitored-by-qrt-pcr-and-molecular-beacon-based-nanosensors
#10
Li Min Tay, Christian Wiraja, Yingnan Wu, Zheng Yang, Eng Hin Lee, Chenjie Xu
Proliferative chondrocytes are critical to realize regeneration of damaged epiphyseal growth plate. However, acquiring autologous replacement cells involves highly-invasive procedures and often results in limited cell quantity. Mesenchymal stem cells (MSCs) are a potential source of chondrogenic cells for the treatment of cartilage disorders and injuries. The temporal effect of transforming growth factor beta 3 (TGFβ3) and fibroblast growth factor 2 (FGF2) on the derivation of proliferative chondrocytes from MSCs in 3D agarose was investigated by manipulating the duration of TGFβ3 and FGF2 treatment...
November 6, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29098493/generating-and-manipulating-high-quality-factors-of-fano-resonance-in-nanoring-resonator-by-stacking-a-half-nanoring
#11
Meng Qin, Lingling Wang, Xiang Zhai, Dechao Chen, Shengxuan Xia
We demonstrate the existence of Fano resonance spectral response in a system of nanoscale plasmonic resonant ring stacked by means of a half nanoring. Our proposed scheme exploits the stacked method under normal incidence to excite the subradiant mode. The nanostructure, which utilizes the combination of Fano resonance and polarization-resolved, has a new rotation mode and high tunability, providing a dynamic control of plasmonic spectral response. High-quality resonant line shapes corresponding to the different order modes of Fano structures are readily achieved at near-infrared wavelengths, which is a benefit to the application for nanosensor in highly integrated circuits...
November 2, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29094119/an-active-structure-preservation-method-for-developing-functional-graphitic-carbon-dots-as-an-effective-antibacterial-agent-and-a-sensitive-ph-and-al-iii-nanosensor
#12
Peng Hou, Tong Yang, Hui Liu, Yuan Fang Li, Cheng Zhi Huang
Functional engineering is a crucial prerequisite for specific and wide applications of optical probes. In this study, we proposed a facile active structure preservation (ASP) method to directly develop new self-functional graphitic carbon dots (g-CDs) through a hydrothermal synthesis route by taking ciprofloxacin hydrochloride, an antibiotic belonging to a group of fluoroquinolone drugs, as an example. To retain the functional structures of the starting materials, the reaction temperature is intentionally controlled below the decomposition temperature of the reactants that hold the functional groups...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29091660/tunable-compact-nanosensor-based-on-fano-resonance-in-a-plasmonic-waveguide-system
#13
Xiaobin Ren, Kun Ren, Yuanxue Cai
An ultracompact plasmonic refractive index sensor based on Fano resonance is proposed. The sensor comprises a metal-insulator-metal waveguide with a stub and a side-coupled split-ring resonator. The effect of structural parameters on Fano resonance and the refractive index sensitivity of the system are analyzed in detail by investigating the transmission spectrum. Simulation results show that Fano resonance has different dependences on the parameters of the sensor structure. The reason is further discussed based on the field pattern...
November 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29083247/tight-coupling-of-astrocyte-energy-metabolism-to-synaptic-activity-revealed-by-genetically-encoded-fret-nanosensors-in-hippocampal-tissue
#14
Iván Ruminot, Jana Schmälzle, Belén Leyton, L Felipe Barros, Joachim W Deitmer
The potassium ion, K(+), a neuronal signal that is released during excitatory synaptic activity, produces acute activation of glucose consumption in cultured astrocytes, a phenomenon mediated by the sodium bicarbonate cotransporter NBCe1 ( SLC4A4). We have explored here the relevance of this mechanism in brain tissue by imaging the effect of neuronal activity on pH, glucose, pyruvate and lactate dynamics in hippocampal astrocytes using BCECF and FRET nanosensors. Electrical stimulation of Schaffer collaterals produced fast activation of glucose consumption in astrocytes with a parallel increase in intracellular pyruvate and biphasic changes in lactate ...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/29079816/flexible-and-tunable-3d-gold-nanocups-platform-as-plasmonic-biosensor-for-specific-dual-lspr-sers-immuno-detection
#15
M Focsan, A M Craciun, M Potara, C Leordean, A Vulpoi, D Maniu, S Astilean
Early medical diagnostic in nanomedicine requires the implementation of innovative nanosensors with highly sensitive, selective, and reliable biomarker detection abilities. In this paper, a dual Localized Surface Plasmon Resonance - Surface Enhanced Raman Scattering (LSPR- SERS) immunosensor based on a flexible three-dimensional (3D) gold (Au) nanocups platform has been implemented for the first time to operate as a relevant "proof-of-concept" for the specific detection of antigen-antibody binding events, using the human IgG - anti-human IgG recognition interaction as a model...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29067391/in-situ-growth-of-gold-nanoparticles-on-hg-2-binding-m13-phages-for-mercury-sensing
#16
Xiaoyan Wang, Ting Yang, Xiaoxiao Zhang, Mingli Chen, Jianhua Wang
Mercury poses a serious threat to human health and the ecosystem. Its pollution is still prevalent in developing areas, which calls for the development of a simple on-site method for Hg(2+) detection. Plasmonic nanosensors for mercury, especially those based on gold nanoparticles (AuNPs), have been increasingly developed due to the flourish of nanotechnology in the last decade. However, the limitation on either selectivity or stability hindered their practical applications. Herein, by taking advantage of the unique optical properties of AuNPs and the versatility of M13 phages, a novel Hg(2+) sensing strategy is proposed...
November 9, 2017: Nanoscale
https://www.readbyqxmd.com/read/29065236/recent-developments-in-nanotechnology-transforming-the-agricultural-sector-a-transition-replete-with-opportunities
#17
REVIEW
Dae-Young Kim, Avinash Kadam, Surendra Shinde, Rijuta Ganesh Saratale, Jayanta Patra, Gajanan Ghodake
The applications and benefits of nanotechnology in agricultural sector have attracted considerable attention, particularly in the invention of unique nanopesticides and nanofertilizers. The contemporary developments in nanotechnology are acknowledged and the most significant opportunities awaiting in the agriculture sector from the recent scientific and technical literature are addressed. This review discusses the significance of recent trends in nanomaterial-based sensors available for the sustainable management of agricultural soil, as well as the role of nanotechnology in detection and protection against plant pathogens, and for food quality and safety...
October 24, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29047715/performance-analysis-of-zinc-oxide-implemented-lossy-mode-resonance-based-optical-fiber-refractive-index-sensor-utilizing-thin-film-nanostructure
#18
Sruthi Prasood Usha, Banshi Dhar Gupta
A detailed primeval study on the lossy mode resonance (LMR) behavior of zinc oxide (ZnO)-coated optical fiber as a refractive index sensor is carried out. Theoretical evaluation predicts ZnO as a good choice for the LMR-based chemical and gas sensor operating in the visible region of the electromagnetic spectrum. To confirm, the optical fiber probe has been fabricated with an optimized film thickness of ZnO over an unclad core of fiber and characterized. Additionally, an LMR-based nanosensor platform utilizing ZnO has also been investigated to find the compatibility of a nanotechnological LMR sensor...
July 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29044942/highly-luminescent-nitrogen-doped-carbon-dots-for-simultaneous-determination-of-chlortetracycline-and-sulfasalazine
#19
Zhengwei Zhang, Jianqiu Chen, Yu Duan, Weixia Liu, Dan Li, Zhengyu Yan, Ke Yang
Here, we have presented a green and facile strategy to fabricate nitrogen-doped carbon dots (N-CDs) and their applications for determination of chlortetracycline (CTC) and sulfasalazine (SSZ). The fluorescent N-CDs, prepared by one-step hydrothermal reaction of citric acid and l-arginine, manifested numerous excellent features containing strong blue fluorescence, good water-solubility, narrow size distribution, and a high fluorescence quantum yield (QY) of 38.8%. Based on the fluorescence quenching effects, the as-synthesized N-CDs as a fluorescent nanosensor exhibited superior analytical performances for quantifying CTC and SSZ...
October 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29031887/direct-colorimetric-detection-of-unamplified-pathogen-dna-by-dextrin-capped-gold-nanoparticles
#20
Amy M Baetsen-Young, Matthew Vasher, Leann L Matta, Phil Colgan, Evangelyn C Alocilja, Brad Day
The interaction between gold nanoparticles (AuNPs) and nucleic acids has facilitated a variety of diagnostic applications, with further diversification of synthesis match bio-applications while reducing biotoxicity. However, DNA interactions with unique surface capping agents have not been fully defined. Using dextrin-capped AuNPs (d-AuNPs), we have developed a novel unamplified genomic DNA (gDNA) nanosensor, exploiting dispersion and aggregation characteristics of d-AuNPs, in the presence of gDNA, for sequence-specific detection...
October 7, 2017: Biosensors & Bioelectronics
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