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https://www.readbyqxmd.com/read/28445812/portable-aptamer-biosensor-of-platelet-derived-growth-factor-bb-using-a-personal-glucose-meter-with-triply-amplified
#1
Lu Hong, Fu Zhou, Dongmin Shi, Xiaojun Zhang, Guangfeng Wang
Sensitive and rapid detection of platelet-derived growth factor BB (PDGF-BB), a cancer-related protein, could help early diagnosis, treatment, and prognosis of cancers. Although some methods have been developed to detect PDGF-BB, few can provide quantitative results using an affordable and portable device that is suitable for home use or field application. In this work, we report the first use of a portable kind of personal glucose meter (PGM) combining a catalytic and molecular beacon (CAMB) system with a cation exchange reaction (CX reaction) for ultrasensitive PDGF-BB assay...
April 19, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28445706/fabrication-of-electrochemical-biosensor-with-vanadium-pentoxide-nano-interface-for-the-detection-of-methylglyoxal-in-rice
#2
Lakshmi Priyankka Alagappan, Preethi Shanmugasundaram, Bhat Lakshmishri Ramachandra, Manju Bhargavi Gumpu, Noel Nesakumar, K Jayanth Babu, Srinivasan Vedantham, John Bosco Balaguru Rayappan
Increased consumption of raw and par-boiled rice results in the formation of methylglyoxal (MG) at higher concentration and leads to complications in diabetic patients. Highly sensitive electrochemical biosensor was developed using glutathione (GSH) as a co-factor with vanadium pentoxide (V2O5) as a nano-interface for MG detection in rice samples. The Pt/V2O5/GSH/Chitosan bioelectrode displayed two well-defined redox peaks in its cyclic voltammograms for MG reduction. This occurred as two electron transfer process where MG gained two electrons from oxidized glutathione disulfide and formed hemithioacetal...
April 23, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28443852/a-biosensor-based-on-self-clickable-aiegen-a-signal-amplification-strategy-for-ultrasensitive-immunoassays
#3
Youyong Yuan, Wenbo Wu, Shidang Xu, Bin Liu
A signal amplified fluorogenic ELISA based on self-clickable fluorogens with aggregation-induced emission characteristics (AIEgen) as a substrate was developed for ultrasensitive immunoassay.
April 26, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28442905/a-strategy-to-minimize-the-sensing-voltage-drift-error-in-a-transistor-biosensor-with-a-nanoscale-sensing-gate
#4
Hyun Woo Son, Minhong Jeun, Jaewon Choi, Kwan Hyi Lee
An ion-sensitive field-effect transistor (ISFET) biosensor is thought to be the center of the next era of health diagnosis. However, questions are raised about its functions and reliability in liquid samples. Consequently, real-life clinical applications are few in number. In this study, we report a strategy to minimize the sensing signal drift error during bioanalyte detection in an ISFET biosensor. A nanoscale SnO2 thin film is used as a gate oxide layer (GOL), and the surface of the GOL is chemically modified for improving bioanalyte-specific binding and for reducing undesirable ion reactions in sample solutions...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28441472/repurposing-a-two-component-system-based-biosensor-for-the-killing-of-vibrio-cholerae
#5
Premkumar Jayaraman, Maciej Bartosz Holowko, Jing Wui Yeoh, Sierin Lim, Chueh Loo Poh
New strategies to control cholera are urgently needed. This study develops an in vitro proof-of-concept sense-and-eradicate system in a wild-type Escherichia coli strain to target the causative pathogen Vibrio cholerae using a synthetic biology approach. Our engineered E. coli specifically detects V. cholerae via its quorum-sensing molecule CAI-1 and responds by expressing the lysis protein (YebF-Art-085), thereby self-lysing to release the killing protein (Art-085) to eradicate V. cholerae. For this report, we individually characterized the YebF-Art-085 and Art-085 expression and their activities when coupled to our previously developed V...
April 25, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28441322/erratum-kim-k-p-singh-a-k-bai-x-leprun-l-bhunia-a-k-novel-pcr-assays-complement-laser-biosensor-based-method-and-facilitate-listeria-species-detection-from-food-sensors-2015-15-22672-22691
#6
Kwang-Pyo Kim, Atul K Singh, Xingjian Bai, Lena Leprun, Arun K Bhunia
The authors wish to correct the oligonucleotide sequence of primer E-LAP-F1 and LIS-R1 in Table 1in their paper published in Sensors [1], doi:10.3390/s150922672, http://www.mdpi.com/1424-8220/15/9/22672. The following table should be used.[...].
April 25, 2017: Sensors
https://www.readbyqxmd.com/read/28439841/label-free-direct-detection-of-mirnas-with-poly-silicon-nanowire-biosensors
#7
Jing He, Jianjun Zhu, Bin Jiang, Yulan Zhao
The diagnostic and prognostic value of microRNAs (miRNAs) in diseases becomes promising. Owing to fast response and high sensitivity, silicon nanowire (SiNW) biosensor has been considered a potential tool for miRNAs detection. Here, we describe a booming method to detect miRNAs with poly-silicon nanowire biosensors. Standard and real miRNA samples are applied in this study. The results show a limitation of 1 fM in the detection of standard miRNA sample with our poly-nanowire devices. Meanwhile, one-base mismatched sequence could be distinguished...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28439415/stretchable-biofuel-cells-as-wearable-textile-based-self-powered-sensors
#8
Itthipon Jeerapan, Juliane R Sempionatto, Adriana Pavinatto, Jung-Min You, Joseph Wang
Highly stretchable textile-based biofuel cells (BFCs), acting as effective self-powered sensors, have been fabricated using screen-printing of customized stress-enduring inks. Due to synergistic effects of nanomaterial-based engineered inks and the serpentine designs, these printable bioelectronic devices endure severe mechanical deformations, e.g., stretching, indentation, or torsional twisting. Glucose and lactate BFCs with the single enzyme and membrane-free configurations generated the maximum power density of 160 and 250 µW cm(-2) with the open circuit voltages of 0...
December 21, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28439254/distinct-conformational-dynamics-of-three-g-protein-coupled-receptors-measured-using-flash-bret-biosensors
#9
Kyla Bourque, Darlaine Pétrin, Rory Sleno, Dominic Devost, Alice Zhang, Terence E Hébert
A number of studies have profiled G protein-coupled receptor (GPCR) conformation using fluorescent biaresenical hairpin binders (FlAsH) as acceptors for BRET or FRET. These conformation-sensitive biosensors allow reporting of movements occurring on the intracellular surface of a receptor to investigate mechanisms of receptor activation and function. Here, we generated eight FlAsH-BRET-based biosensors within the sequence of the β2-adrenergic receptor (β2AR) and compared agonist-induced responses to the angiotensin II receptor type I (AT1R) and the prostaglandin F2α receptor (FP)...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28437639/a-novel-biosensor-based-on-boronic-acid-functionalized-metal-organic-frameworks-for-the-determination-of-hydrogen-peroxide-released-from-living-cells
#10
Hongxia Dai, Wenjuan Lü, Xianwei Zuo, Qian Zhu, Congjie Pan, Xiaoying Niu, Juanjuan Liu, HongLi Chen, Xingguo Chen
In this work, we report a durable and sensitive H2O2 biosensor based on boronic acid functionalized metal-organic frameworks (denoted as MIL-100(Cr)-B) as an efficient immobilization matrix of horseradish peroxidase (HRP). MIL-100(Cr)-B features a hierarchical porous structure, extremely high surface area, and sufficient recognition sites, which can significantly increase HRP loading and prevent them from leakage and deactivation. The H2O2 biosensor can be easily achieved without any complex processing. Meanwhile, the immobilized HRP exhibited enhanced stability and remarkable catalytic activity towards H2O2 reduction...
April 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28437064/rapid-and-highly-sensitive-detection-of-dopamine-using-conjugated-oxaborole-based-polymer-and-glycopolymer-systems
#11
Keren Jiang, Yinan Wang, Garima Thakur, Yohei Kotsuchibashi, Selvaraj Naicker, Ravin Narain, Thomas Thundat
A conjugated polymer interface consisting of an oxaborole containing polymer and a glycopolymer was used for achieving very high selectivity in dopamine (DA) detection. The optimum binding affinity between the polymers promotes the selectivity to DA through a displacement mechanism while remaining unaffected by other structurally related analogs and saccharide derivatives. Real-time detection of DA with very high selectivity and sensitivity has been demonstrated by immobilizing the polymer conjugates on surface plasmon resonance (SPR) and microcantilever (MCL) sensor platforms...
April 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28435000/context-dependent-intravital-imaging-of-therapeutic-response-using-intramolecular-fret-biosensors
#12
REVIEW
James R W Conway, Sean C Warren, Paul Timpson
Intravital microscopy represents a more physiologically relevant method for assessing therapeutic response. However, the movement into an in vivo setting brings with it several additional considerations, the primary being the context in which drug activity is assessed. Microenvironmental factors, such as hypoxia, pH, fibrosis, immune infiltration and stromal interactions have all been shown to have pronounced effects on drug activity in a more complex setting, which is often lost in simpler two- or three-dimensional assays...
April 18, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28434989/colorimetric-detection-of-microrna-based-hybridization-chain-reaction-for-signal-amplification-and-enzyme-for-visualization
#13
Na Ying, Taifan Sun, Zhibao Chen, Guangping Song, Bingyao Qi, Shengjun Bu, Xiuwei Sun, Jiayu Wan, Zehong Li
MicroRNAs (miRNAs) have key roles in gene expression and can be employed as biomarkers for early diagnosis of various diseases, especially cancers. Detection of miRNAs remains challenging and often requires detection platforms. Here, a horseradish peroxidase (HRP)-assisted hybridization chain reaction (HCR) for colorimetric detection of miR-155 was described. In the presence of target miRNA, the capture probe immobilized on the microplate sandwiched the target miR-155 with the 3' end of the reporter probe. Another exposed part of the RP at the 5'end triggered HCR producing double-stranded DNA polymers with multiple fluorescein isothiocyanates (FITC) for signal amplification...
April 20, 2017: Analytical Biochemistry
https://www.readbyqxmd.com/read/28434902/intravital-microscopy-of-biosensor-activities-and-intrinsic-metabolic-states
#14
REVIEW
Seth Winfree, Takashi Hato, Richard N Day
Intravital microscopy (IVM) is an imaging tool that is capable of detecting subcellular signaling or metabolic events as they occur in tissues in the living animal. Imaging in highly scattering biological tissues, however, is challenging because of the attenuation of signal in images acquired at increasing depths. Depth-dependent signal attenuation is the major impediment to IVM, limiting the depth from which significant data can be obtained. Therefore, making quantitative measurements by IVM requires methods that use internal calibration, or alternatively, a completely different way of evaluating the signals...
April 20, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/28433859/photoelectrochemical-immunosensor-for-methylated-rna-detection-based-on-g-c3n4-cds-quantum-dots-heterojunction-and-phos-tag-biotin
#15
Haiyan Wang, Qihai Zhang, Huanshun Yin, Minghui Wang, Wenjing Jiang, Shiyun Ai
N(6)-methyladenosine (m(6)A) is an enigmatic and abundant internal modification in eukaryotic messenger RNA (mRNA), which could affect various aspects of RNA metabolism and mRNA translation. Herein, a novel photoelectrochemical (PEC) immunosensor was constructed for m(6)A detection based on the inhibition of Cu(2+) to the photoactivity of g-C3N4/CdS quantum dots (g-C3N4/CdS) heterojunction, where g-C3N4/CdS heterojunction was used as photoactive material, anti-m(6)A antibody as recognition unit for m(6)A-containing RNA, Phos-tag-biotin as link unit and avidin functionalized CuO as PEC signal indicator...
April 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28433858/reduced-graphene-oxide-chitosan-aptamer-interface-as-new-platform-for-ultrasensitive-detection-of-human-epidermal-growth-factor-receptor-2
#16
Arezoo Tabasi, Abdollah Noorbakhsh, Ensiyeh Sharifi
The present work describes an ultrasensitive electrochemical aptamer-based assay for detection of human epidermal growth factor receptor 2 protein (HER2) cancer biomarker as a model analyte. Results show that the reduced graphene oxide-chitosan (rGO-Chit) film as a suitable electrode material possesses great favorable properties including high homogeneity, good stability, large surface area and high fraction of amine groups as aptamer binding sites. Various steps of aptasensor fabrication were characterized using microscopic, energy-dispersive X-ray spectroscopy (EDAX), Fourier transform infrared (FTIR) spectroscopy and electrochemical techniques...
April 18, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28433631/detection-of-camp-and-of-pka-activity-in-saccharomyces-cerevisiae-single-cells-using-fluorescence-resonance-energy-transfer-fret-probes
#17
Sonia Colombo, Serena Broggi, Maddalena Collini, Laura D'Alfonso, Giuseppe Chirico, Enzo Martegani
In Saccharomyces cerevisiae the second messenger cyclic adenosine monophosphate (cAMP) and protein kinase A (PKA) play a central role in metabolism regulation, stress resistance and cell cycle progression. To monitor cAMP levels and PKA activity in vivo in single S. cerevisiae cells, we expressed an Epac-based FRET probe and a FRET-based A-kinase activity reporter, which were proven to be useful live-cell biosensors for cAMP levels and PKA activity in mammalian cells. Regarding detection of cAMP in single yeast cells, we show that in wild type strains the CFP/YFP fluorescence ratio increased immediately after glucose addition to derepressed cells, while no changes were observed when glucose was added to a strain that is not able to produce cAMP...
April 19, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28433059/an-entropy-driven-signal-amplifying-strategy-for-real-time-monitoring-of-dna-methylation-process-and-high-throughput-screening-of-methyltransferase-inhibitors
#18
Siyi Chen, Huan Ma, Wang Li, Zhou Nie, Shouzhuo Yao
Based on the entropy-driven toehold-mediated hairpin displacement (ETHDA), a facile and sensitive one-step fluorescence sensing platform has been proposed for the evaluation DNA methylation process catalyzed by methyltransferase (MTase). In this designed system, a hairpin probe is methylated by DNA adenine methylation (Dam) MTase and cleaved by DpnI endonuclease successively, liberating a catalyzer strand to initiate the signal amplification. The fluorescence intensity is increasing upon the catalyzer strand triggered circulating procedure of the ETHDA process...
June 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28432344/aptamer-based-label-free-electrochemical-biosensor-array-for-the-detection-of-total-and-glycated-hemoglobin-in-human-whole-blood
#19
Shimaa Eissa, Mohammed Zourob
The increase of the level of glucose in blood leads to an increase in the fraction of glycated hemoglobin (HbA1c). Therefore, the percentage of HbA1c in the blood can serve as a marker for the average glucose level over the past three months and thus, it can be used to diagnose diabetes. Here, we report the selection, identification and characterization of specific DNA aptamers against HbA1c- and total hemoglobin (tHb) and their integration into an electrochemical array sensing platform. High affinity and specificity aptamers were selected in vitro showing dissociation constants of 2...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432329/affinity-biosensors-using-recombinant-native-membrane-proteins-displayed-on-exosomes-application-to-botulinum-neurotoxin-b-receptor
#20
Richard Desplantes, Christian Lévêque, Benjamin Muller, Manuela Lotierzo, Géraldine Ferracci, Michel Popoff, Michael Seagar, Robert Mamoun, Oussama El Far
The development of simple molecular assays with membrane protein receptors in a native conformation still represents a challenging task. Exosomes are extracellular vesicles which, due to their stability and small size, are suited for analysis in various assay formats. Here, we describe a novel approach to sort recombinant fully native and functional membrane proteins to exosomes using a targeting peptide. Specific binding of high affinity ligands to the potassium channel Kv1.2, the G-protein coupled receptor CXCR4, and the botulinum neurotoxin type B (BoNT/B) receptor, indicated their correct assembly and outside out orientation in exosomes...
April 21, 2017: Scientific Reports
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