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Ning Wang, Di Zhang, Xinyu Deng, Ying Sun, Xinghua Wang, Pinyi Ma, Daqian Song
Herein we report a novel polydopamine-silver nanoparticle-polydopamine-gold (PDA-AgNPs-PDA-Au) film based surface plasmon resonance (SPR) biosensor for horse IgG detection. The PDA-AgNPs-PDA-Au film sensing platform was built on Au-film via layer-by-layer self-assembly. Ag ion was reduced in situ to AgNPs in presence of PDA. The top PDA layer can prevent AgNPs from being oxidized and connect with antibody via Schiff alkali reaction directly. The morphology and thickness of the modified gold film were characterized using scanning electron microscope and Talystep...
October 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Hanbi Kim, Jong Uk Lee, Sojin Song, Soohyun Kim, Sang Jun Sim
Alzheimer's disease (AD) is a neurodegenerative disease associated with the loss of nerve cells in the brain. The disease is affected by multifactorial pathways and leads to changes in related biomolecular levels as AD progresses. Therefore, AD should be diagnosed with combined detection of several lesions to improve accuracy. Amyloid beta 1-40, 1-42 and τ (tau) protein are milestones in AD pathology and can be used as main screening and diagnostic target markers. Here, we suggest a highly selective biosensor for detection of AD core biomarkers on one platform through distinct localized surface plasmon resonance (LSPR) depending on gold nanoparticles shapes, called a shape-code biosensor...
October 11, 2017: Biosensors & Bioelectronics
Jongchan Yeo, Andrew B Dippel, Xin C Wang, Ming C Hammond
Intracellular signaling enzymes drive critical changes in cellular physiology and gene expression, but their endogenous activities in vivo remain highly challenging to study in real-time and for individual cells. Here we show that flow cytometry can be performed in complex media to monitor single-cell population distributions and dynamics of cyclic di-GMP signaling, which controls the bacterial colonization program. These in vivo biochemistry experiments are enabled by our second-generation RNA-based fluorescent (RBF) biosensors, which exhibit high fluorescence turn-on in response to cyclic di-GMP...
October 20, 2017: Biochemistry
Bin Zhao, Liya Zhou, Li Ma, Ying He, Jing Gao, Dan Li, Yanjun Jiang
In this work, glucose oxidase (GOD) and catalase (CAT) were co-immobilized on novel silica inverse opals (IO-SiO2) through sol-gel process. The immobilized bi-enzyme system named GOD/CAT@IO-SiO2 was successfully fabricated and characterized. Morphology characterization indicated that GOD/CAT@IO-SiO2 had hierarchical porous structure, and the pore diameter of macroporous and mesoporous were 500±50nm and 6.8nm, respectively. The macrospores were connected through windows of 100±30nm. The results of stability tests indicated that both acid (or base) resistance and thermal tolerance of GOD/CAT@IO-SiO2 were improved...
October 16, 2017: International Journal of Biological Macromolecules
Sota Yagi, Satoshi Akanuma, Asumi Kaji, Hiroya Niiro, Hayato Akiyama, Tatsuya Uchida, Akihiko Yamagishi
Protein-metal hybrids are functional materials with various industrial applications. For example, a redox enzyme immobilized on a platinum electrode is a key component of some biofuel cells and biosensors. To create these hybrid materials, protein molecules are bound to metal surfaces. Here, we report the selection of a novel platinum-binding sequence in a loop of a four-helix bundle protein, the Lac repressor four-helix protein (LARFH), an artificial protein in which four identical α-helices are connected via three identical loops...
October 16, 2017: Journal of Bioscience and Bioengineering
Zhijun Li, Kim A Munro, Mina Narouz, Bin Hao, Cathleen M Crudden, J Hugh Horton, Hongxia Hao
Surface chemistry is a key enabler for various biosensing applications. Surface plasmon resonance (SPR)-based biosensors routinely employ thiol-based chemistry for the linker layer between gold-coated support surfaces and functional biosensor surfaces. However, there is a growing awareness that such sensor surfaces are prone to oxidation/degradation problems in the presence of oxygen, and previous efforts to improve the stability have shown limited advancements. As an alternative, recent studies employing N-heterocyclic carbene (NHC) self assembled monolayers (SAMs) deposited on gold have shown significant promise in this area...
October 19, 2017: ACS Applied Materials & Interfaces
Yuyu Tan, Wenli Liu, Zhi Zhu, Lijun Lang, Junxia Wang, Mengjiao Huang, Mingxia Zhang, Chaoyong Yang
Since the transferrin receptor (CD71 or TFRC) is known to be highly expressed in numerous cancers, CD71 has become an attractive target in cancer research. Acquiring specific molecular probes for CD71, such as small molecular ligands, aptamers, peptides, or antibodies, is of great importance for cancer cell recognition and capture. In this work, we chose CD71 as the target for phage display, and after four rounds of positive selection and one round of negative selection, the specific phage library was enriched...
October 18, 2017: Analytical and Bioanalytical Chemistry
Greta Faccio, Stefan Salentinig
Protein biosensors are widely used for the monitoring of metabolite concentration and enzymatic activities inside living cells and in in vitro applications. Neutrophil elastase (NE) is a serine protease of relevance in inflammatory diseases whose activity can lead to pathological conditions if unregulated. This study focuses on the structural characterization of a biosensor for NE activity based on Förster resonance energy transfer (FRET). The cleavage by NE results in dissociation of the FRET fluorescent protein pair and alteration of the fluorescent emission spectrum...
October 17, 2017: Biophysical Journal
Yi Liu, Jinyang Li, Tanya Tschirhart, Jessica L Terrell, Eunkyoung Kim, Chen-Yu Tsao, Deanna L Kelly, William E Bentley, Gregory F Payne
Biology and electronics are both expert at for accessing, analyzing, and responding to information. Biology uses ions, small molecules, and macromolecules to receive, analyze, store, and transmit information, whereas electronic devices receive input in the form of electromagnetic radiation, process the information using electrons, and then transmit output as electromagnetic waves. Generating the capabilities to connect biology-electronic modalities offers exciting opportunities to shape the future of biosensors, point-of-care medicine, and wearable/implantable devices...
October 18, 2017: Advanced Healthcare Materials
Dengbin Yu, Junfeng Zhai, Changyu Liu, Xueping Zhang, Lu Bai, Yizhe Wang, Shaojun Dong
The monitoring of toxicity of water is very important to estimate the safety of drinking water and the level of water pollution. Herein, a small microbial three-electrode cell (M3C) biosensor filled with polystyrene particles was proposed for on-line monitoring the acute water toxicity. The peak current of the biosensor related with the performance of bioanode was regarded as the toxicity indicator, and thus the acute water toxicity could be determined in terms of inhibition ratio through comparing the peak current obtained with water sample to that obtained with non-toxic standard water...
October 18, 2017: ACS Sensors
M Ali Aboudzadeh, M Sanromán-Iglesias, C H Lawrie, M Grzelczak, L M Liz-Marzán, T Schäfer
Developing strategies to detect single nucleotide DNA mutations associated with treatment decisions in cancer patients from liquid biopsies is a rapidly emerging area of personalized medicine that requires high specificity. Here we report how to design an easy enzyme-free approach that could create a platform for detection of L858R mutation of EGFR that is a predictive biomarker of tyrosine kinase treatment in many cancers. This approach includes the addition of blocking probes with the antisense ssDNA at different blocking positions and different concentrations such as to avoid re-annealing with the respective sense ssDNA...
October 18, 2017: Nanoscale
David Kinnamon, Ramesh Ghanta, Kai-Chun Lin, Sriram Muthukumar, Shalini Prasad
A non-faradaic label-free cortisol biosensor was demonstrated using MoS2 nanosheets integrated into a nanoporous flexible electrode system. Low volume (1-5 μL) sensing was achieved through use of a novel sensor stack design comprised of vertically aligned metal electrodes confining semi-conductive MoS2 nanosheets. The MoS2 nanosheets were surface functionalized with cortisol antibodies towards developing an affinity biosensor specific to the physiological relevant range of cortisol (8.16 to 141.7 ng/mL) in perspired human sweat...
October 17, 2017: Scientific Reports
Yating Liu, Wen Shen, Qi Li, Jiangnan Shu, Lingfeng Gao, Mingming Ma, Wei Wang, Hua Cui
Most known chemiluminescence (CL) reactions exhibit flash-type light emission. Great efforts have been devoted to the development of CL systems that emit light with high intensity and long-lasting time. However, a long-lasting CL system that can last for hundreds of hours is yet-to-be-demonstrated. Here we show firefly-mimicking intensive and long-lasting CL hydrogels consisting of chitosan, CL reagent N-(4-aminobutyl)-N-ethylisoluminol (ABEI) and catalyst Co(2+). The light emission is even visible to naked eyes and lasts for over 150 h when the hydrogels are mixed with H2O2...
October 17, 2017: Nature Communications
Hideaki Yano, Davide Provasi, Ning Sheng Cai, Marta Filizola, Sergi Ferre, Jonathan A Javitch
Gαs (Gs) and Gαolf (Golf) are highly homologous G protein α; subunits that activate adenylate cyclase, thereby serving as crucial mediators of intracellular signaling. Owing to their dramatically different brain expression patterns, we studied similarities and differences between their activation processes with the aim of comparing their receptor coupling mechanisms. We engineered novel luciferase- and Venus-fused Gα constructs that can be used in bioluminescence resonance energy transfer (BRET) assays...
October 17, 2017: Journal of Biological Chemistry
Tiesheng Wu, Yu Shao, Ying Wang, Shaoqing Cao, Weiping Cao, Feng Zhang, Changrui Liao, Jun He, Yijian Huang, Maoxiang Hou, Yiping Wang
The refractive index sensing characteristics of the side-polished photonic crystal fiber (PCF) surface plasmon resonance (SPR) sensor are detailed investigated in this paper. We used the finite element method (FEM) to study the influences of the side-polished depth, air hole size, lattice constant, and the refractive index (RI) of the PCF material on sensing performance. The simulation results show that the side-polished depth, air hole size, lattice pitch have significant influence on the coupling strength between core mode and surface plasmon polaritons (SPPs), but have little influence on sensitivity; the coupling strength and sensitivity will significant increase with the decrease of RI of the PCF material...
August 21, 2017: Optics Express
Chiaki Kuroda, Yoshimichi Ohki, Makoto Fujimaki
A waveguide-mode sensor with a planar sensing chip, consisting of two waveguiding layers and a glass substrate, is a promising candidate for a near-field illumination biosensor. Aiming at using fluorescent labeling induced by ultraviolet light, we optimize the structure of a waveguide-mode sensing chip, based on the mechanism for enhancing ultraviolet near-field light revealed by numerical calculations. Candidates of optimal materials are also presented. The chip optimized as above should be able to enhance the intensity of ultraviolet near-field light 25 times as high as an Al surface plasmon resonance sensing chip...
October 16, 2017: Optics Express
Zepeng Kang, Kailong Jiao, Jin Cheng, Ruiyun Peng, Shuqiang Jiao, Zongqian Hu
A novel three-dimensional (3D) carbon composite of PANI1600@CNTs with rhizobium-like structure is prepared by in-situ polymerization of aniline monomers around and along the functionalized carbon nanotubes (CNTs) and then carbonized at 1600°C for enzymatic biofuel cells (EBFCs). The SEM and TEM images clearly show that the carbonized PANI grew seamlessly on the surface of CNTs and presented the rhizobium-like structure. The carbonized PANI acts like conductive "glue" and connects the adjacent tubes together, which can assemble the CNTs into a 3D network...
October 7, 2017: Biosensors & Bioelectronics
Xuanbo Zhu, Yahong Zhou, Junran Hao, Bin Bao, Xiujie Bian, Xiangyu Jiang, Jinhui Pang, Haibo Zhang, Zhenhua Jiang, Lei Jiang
Design and fabrication of robust nanoporous membrane in large-scale is still being a challenge and is of fundamental importance for practical applications. Here, a robust three/two dimension - polymer/graphene oxide heterogeneous nanoporous membrane in large-scale via the self-assembly approach is constructed, by chemically designing a robust charge-density-tunable nanoporous ionomer with uniform pore size. To obtain nanoporous polymer which maintains high mechanical strength and promotes multi-functionality, we design a series of amphiphilic copolymer by introducing a positively charged pyridine moiety into engineering polymer polyphenylsulphone (PPSU)...
October 17, 2017: ACS Nano
Ying Huang, Jin Xu, Junjie Liu, Xiangyang Wang, Bin Chen
Rapid diagnosis of diseases at their initial stage is critical for effective clinical outcomes and promotes general public health. Classical in vitro diagnostics require centralized laboratories, tedious work and large, expensive devices. In recent years, numerous electrochemical biosensors have been developed and proposed for detection of various diseases based on specific biomarkers taking advantage of their features, including sensitivity, selectivity, low cost and rapid response. This article reviews research trends in disease-related detection with electrochemical biosensors...
October 17, 2017: Sensors
Luye Mu, Ilia A Droujinine, Jieun Lee, Mathias Wipf, Paschall Davis, Chris Adams, Jennifer Hannant, Mark A Reed
Silicon nanowire field effect transistors (NWFETs) are low noise, low power, ultrasensitive biosensors that are highly amenable to integration. However, using NWFETs to achieve direct protein detection in physiological buffers such as blood serum remains difficult due to Debye screening, nonspecific binding, and stringent functionalization requirements. In this work, we performed an indirect sandwich immunoassay in serum combined with exponential DNA amplification and pH measurement by ultrasensitive NWFET sensors...
October 17, 2017: Analytical Chemistry
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