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Surface plasmon resonance

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https://www.readbyqxmd.com/read/28918231/highly-sensitive-surface-plasmon-resonance-biosensor-for-the-detection-of-hiv-related-dna-based-on-dynamic-and-structural-dna-nanodevices
#1
Wei Diao, Min Tang, Shijia Ding, Xinmin Li, Wenbin Cheng, Fei Mo, Xiaoyu Yan, Hongmin Ma, Yurong Yan
Early detection, diagnosis and treatment of human immune deficiency virus (HIV) infection is the key to reduce acquired immunodeficiency syndrome (AIDS) mortality. In our research, an innovative surface plasmon resonance (SPR) biosensing strategy has been developed for highly sensitive detection of HIV-related DNA based on entropy-driven strand displacement reactions (ESDRs) and double-layer DNA tetrahedrons (DDTs). ESDRs as enzyme-free and label-free signal amplification circuit can be specifically triggered by target DNA, leading to the cyclic utilization of target DNA and the formation of plentiful double-stranded DNA (dsDNA) products...
September 9, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28918188/the-effect-of-thiolated-phospholipids-on-formation-of-supported-lipid-bilayers-on-gold-substrates-investigated-by-surface-sensitive-methods
#2
Abdulhalim Kılıç, M Fazeli Jadidi, Hakan Özgür Özer, Fatma Neşe Kök
Most of the model lipid membrane studies on gold involve the usage of various surface-modification strategies to rupture liposomes and induce lipid bilayer formation since liposomes with polar surfaces do not interact with bare, hydrophobic gold. In this study, a thiol-modified phospholipid, 1,2-Dipalmitoyl-sn-Glycero-3-Phosphothioethanol (DPPTE) was incorporated into phosphatidylcholine (PC) based liposomes to form supported lipid bilayer (SLB) on gold surfaces without further modification. The binding kinetics of liposomes with different DPPTE ratio (0...
September 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28917747/colorimetric-detection-of-ammonia-using-smartphones-based-on-localized-surface-plasmon-resonance-of-silver-nanoparticles
#3
Amirmostafa Amirjani, Davoud Haghshenas Fatmehsari
In this work, a rapid and straightforward method was developed for colorimetric determination of ammonia using smartphones. The mechanisms is based on the manipulation of the surface plasmon band of silver nanoparticles (AgNPs) via the formation of Ag (NH3)2(+) complex. This complex decreases the amount of AgNPs in the solution and consequently, the color intensity of the colloidal system decreases. Not only the variation in color intensity of the solution can be tracked by a UV-vis spectrophotometer, but also a smartphone can be employed to monitor the color intensity variation by RGB analysis...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917200/improved-visible-light-activities-for-degrading-pollutants-on-tio2-g-c3n4-nanocomposites-by-decorating-spr-au-nanoparticles-and-2-4-dichlorophenol-decomposition-path
#4
Amir Zada, Yang Qu, Sharafat Ali, Ning Sun, Hongwei Lu, Rui Yan, Xuliang Zhang, Liqiang Jing
It has been clearly demonstrated that the visible-light photocatalytic activities of g-C3N4 (CN) for degrading 2,4-dichlorophenol (2,4-DCP) and bisphenol A (BPA) could be improved by fabricating nanocomposites with a proper amount of nanocrystalline anatase TiO2. Interestingly, the visible-light activities of the amount-optimized nanocomposite could be further improved after decorating Au nanoparticles, with 5.11- and 3.1-time improvement respectively for 2,4-DCP and BPA compared to that of CN, even much higher than that of P25 TiO2 under UV-vis irradiation...
September 7, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28916835/plasmon-coupled-whispering-gallery-modes-on-nanodisk-arrays-for-signal-enhancements
#5
Tae Young Kang, Wonju Lee, Heesang Ahn, Dong-Myeong Shin, Chang-Seok Kim, Jin-Woo Oh, Donghyun Kim, Kyujung Kim
Metallic nanostructures including single and double nanodisks are successfully used to enhance the localized electric field in vicinity of microcavity in whispering gallery mode (WGM) sensor. We demonstrate numerical calculations of plasmonic coupling of WGMs to single and double nanodisk arrays on a planar substrate. We then experimentally confirmed that the resonance wavelength of WGM sensor was dramatically shifted by adoption of single and double nanodisks on the surface of microcavity in the WGM sensor...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915947/immunosensor-array-platforms-based-on-self-assembled-dithiols-for-the-electrochemical-detection-of-tetrodotoxins-in-puffer-fish
#6
Laia Reverté, Katrina Campbell, Maria Rambla-Alegre, Christopher T Elliott, Jorge Diogène, Mònica Campàs
The recent detection of tetrodotoxins (TTXs) in European fish and shellfish has emphasized the urgent need to develop specific, selective, rapid and easy-to-use methods for their detection to assess the potential risk posed to human health. For this purpose, a dithiol self-assembled monolayer (SAM)-based immunoassay previously performed on maleimide plates (mELISA) has been adapted to gold electrode arrays for the development of an electrochemical immunosensor for TTX. The electrochemical SAM-based immunosensor designed herein, provided an oriented, stable and spaced sensing platform for the determination of TTX, attaining a limit of detection of 2...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915239/structural-basis-for-the-high-specificity-of-a-trypanosoma-congolense-immunoassay-targeting-glycosomal-aldolase
#7
Joar Pinto, Steven Odongo, Felicity Lee, Vaiva Gaspariunaite, Serge Muyldermans, Stefan Magez, Yann G-J Sterckx
BACKGROUND: Animal African trypanosomosis (AAT) is a neglected tropical disease which imposes a heavy burden on the livestock industry in Sub-Saharan Africa. Its causative agents are Trypanosoma parasites, with T. congolense and T. vivax being responsible for the majority of the cases. Recently, we identified a Nanobody (Nb474) that was employed to develop a homologous sandwich ELISA targeting T. congolense fructose-1,6-bisphosphate aldolase (TcoALD). Despite the high sequence identity between trypanosomatid aldolases, the Nb474-based immunoassay is highly specific for T...
September 15, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28915054/rapid-removal-and-mineralization-of-bisphenol-a-by-heterosupramolecular-plasmonic-photocatalyst-consisting-of-gold-nanoparticle-loaded-titanium-iv-oxide-and-surfactant-admicelle
#8
Shin-Ichi Naya, Junpei Yamauchi, Takashi Okubo, Hiroaki Tada
The establishment of the technology for rapidly and completely remove and mineralize harmful phenolic compounds from water is of great importance for environmental conservation. Visible-light irradiation ( > 430 nm, light intensity integrated from 420 to 485 nm = 6.0 mW cm-2) of Au nanoparticle (NP)-loaded TiO2 (Au/TiO2) in dilute aqueous solutions of bisphenol A (BPA) and p-cresol (PC) causes degradation of the phenols. The addition of trimethylstearylammonium chloride (C18TAC) enhances the adsorption of BPA on Au/TiO2 to greatly increase the rate of reaction...
September 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28914231/plasmonic-resonances-in-hybrid-systems-of-aluminum-nanostructured-arrays-and-few-layer-graphene-within-the-uv-ir-spectral-range
#9
Ricardo González-Campuzano, J M Saniger, Doroteo Mendoza
The size-controllable and ordered Al nanocavities and nanodomes arrays were synthesized by electrochemical anodization of aluminum using phosphoric acid, citric acid and mixture both acids. Few layer graphene (FLG) was transferred directly on top of Al nanostructures and their morphology were evaluated by Scanning Electron Microscopy. The interaction between FLG and the plasmonic properties of Al nanostructures arrays were investigated based on specular reflectivity in the UV-Vis-IR range and Raman Spectroscopy...
September 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28913661/discovery-of-non-peptidic-small-molecule-inhibitors-of-cyclophilin-d-as-neuroprotective-agents-in-a%C3%AE-induced-mitochondrial-dysfunction
#10
Insun Park, Ashwini M Londhe, Ji Woong Lim, Beoung-Geon Park, Seo Yun Jung, Jae Yeol Lee, Sang Min Lim, Kyoung Tai No, Jiyoun Lee, Ae Nim Pae
Cyclophilin D (CypD) is a mitochondria-specific cyclophilin that is known to play a pivotal role in the formation of the mitochondrial permeability transition pore (mPTP).The formation and opening of the mPTP disrupt mitochondrial homeostasis, cause mitochondrial dysfunction and eventually lead to cell death. Several recent studies have found that CypD promotes the formation of the mPTP upon binding to β amyloid (Aβ) peptides inside brain mitochondria, suggesting that neuronal CypD has a potential to be a promising therapeutic target for Alzheimer's disease (AD)...
September 14, 2017: Journal of Computer-aided Molecular Design
https://www.readbyqxmd.com/read/28912782/the-sand-fly-salivary-protein-lufaxin-inhibits-the-early-steps-of-the-alternative-pathway-of-complement-by-direct-binding-to-the-proconvertase-c3b-b
#11
Antonio F Mendes-Sousa, Vladimir Fazito do Vale, Naylene C S Silva, Anderson B Guimaraes-Costa, Marcos H Pereira, Mauricio R V Sant'Anna, Fabiano Oliveira, Shaden Kamhawi, José M C Ribeiro, John F Andersen, Jesus G Valenzuela, Ricardo N Araujo
Saliva of the blood feeding sand fly Lutzomyia longipalpis was previously shown to inhibit the alternative pathway (AP) of the complement system. Here, we have identified Lufaxin, a protein component in saliva, as the inhibitor of the AP. Lufaxin inhibited the deposition of C3b, Bb, Properdin, C5b, and C9b on agarose-coated plates in a dose-dependent manner. It also inhibited the activation of factor B in normal serum, but had no effect on the components of the membrane attack complex. Surface plasmon resonance (SPR) experiments demonstrated that Lufaxin stabilizes the C3b-B proconvertase complex when passed over a C3b surface in combination with factor B...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28912109/a-label-free-biosensor-based-on-localized-surface-plasmon-resonance-for-diagnosis-of-tuberculosis
#12
Wenxia Sun, Shishan Yuan, Haowen Huang, Ning Liu, Yunhong Tan
A biosensor based on localized surface plasmon resonance (LSPR) was developed to detect the antibody of Mycobacterium tuberculosis using the fusion protein CFP10-ESAT6 as an antigen. To explore the diagnostic potential of the biosensor for tuberculosis (TB), the fusion protein CFP10-ESAT6 was immobilized on gold nanorods (Au NRs) by chemical modification, and the functionalized Au NRs were subsequently incubated with serums collected from TB patients, non-tuberculous pulmonary disease patients or healthy individuals...
September 11, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28911659/the-detoxifying-effects-of-structural-elements-of%C3%A2-persimmon-tannin-on-chinese-cobra-phospholipase-a2-correlated-with-their-structural-disturbing-effects-well
#13
Ying Zhang, Chun-Mei Li
The effects of persimmon tannin (PT) characteristic structural elements on Naja atra phospholipase A2 (PLA2)-induced lethality, myotoxicity, and hemolysis in mice models were determined. In addition, methods including surface plasmon resonance, dynamic light scattering, and Fourier transform infrared spectroscopy were explored to uncover the possible detoxifying mechanisms of PT on snake venom PLA2. Our results revealed that PT characteristic elements (EGCG, ECG, A-type EGCG dimer, and A-type ECG dimer) could neutralize the lethality, myotoxicity, and hemolysis of PLA2...
July 2017: Journal of Food and Drug Analysis
https://www.readbyqxmd.com/read/28910573/an-alternative-conformation-of-human-trprs-suggests-a-role-of-zinc-in-activating-non-enzymatic-function
#14
Xiaoling Xu, Huihao Zhou, Quansheng Zhou, Fei Hong, My-Nuong Vo, Wanqiang Niu, Zhiguo Wang, Xiaolin Xiong, Kanaha Nakamura, Keisuke Wakasugi, Paul Schimmel, Xiang-Lei Yang
Tryptophanyl-tRNA synthetase (TrpRS) in vertebrates contains a N-terminal extension in front of the catalytic core. Proteolytic removal of the N-terminal 93 amino acids gives rise to T2-TrpRS, which has potent anti-angiogenic activity mediated through its extracellular interaction with VE-cadherin. Zinc has been shown to have anti-angiogenic effects and can bind to human TrpRS. However, the connection between zinc and the anti-angiogenic function of TrpRS has not been explored. Here we report that zinc binding can induce structural relaxation in human TrpRS to facilitate the proteolytic generation of a T2-TrpRS-like fragment...
September 14, 2017: RNA Biology
https://www.readbyqxmd.com/read/28902982/poly-vinylpyrrolidone-free-multistep-synthesis-of-silver-nanoplates-with-plasmon-resonance-in-the-near-infrared-range
#15
Assad U Khan, Zhengping Zhou, Joseph Krause, Guoliang Liu
Herein, a poly(vinylpyrrolidone) (PVP)-free method is described for synthesizing Ag nanoplates that have localized surface plasmon resonance in the near-infrared (NIR) range. Citrate-capped Ag spherical nanoparticles are first grown into small Ag nanoplates that resonate in the range of 500-800 nm. The small Ag nanoplates are used as seeds to further grow into large Ag nanoplates with a lateral dimension of 100-600 nm and a plasmon resonance wavelength of 800-1660 nm and above. The number of growth steps can be increased as desired...
September 13, 2017: Small
https://www.readbyqxmd.com/read/28901365/97-percent-light-absorption-in-an-ultrabroadband-frequency-range-utilizing-an-ultrathin-metal-layer-randomly-oriented-densely-packed-dielectric-nanowires-as-an-excellent-light-trapping-scaffold
#16
Amir Ghobadi, Sina Abedini Dereshgi, Hodjat Hajian, Gizem Birant, Bayram Butun, Alpan Bek, Ekmel Ozbay
In this paper, we propose a facile and large scale compatible design to obtain perfect ultrabroadband light absorption using metal-dielectric core-shell nanowires. The design consists of atomic layer deposited (ALD) Pt metal uniformly wrapped around hydrothermally grown titanium dioxide (TiO2) nanowires. It is found that the randomly oriented dense TiO2 nanowires can impose excellent light trapping properties where the existence of an ultrathin Pt layer (with a thickness of 10 nm) can absorb the light in an ultrabroadband frequency range with an amount near unity...
September 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28901134/diagnosis-of-tuberculosis-using-colorimetric-gold-nanoparticles-on-a-paper-based-analytical-device
#17
Tsung-Ting Tsai, Chia-Yu Huang, Chung-An Chen, Shu-Wei Shen, Mei-Chia Wang, Chao-Min Cheng, Chien-Fu Chen
We have developed a colorimetric sensing strategy employing gold nanoparticles and a paper-based analytical platform for the diagnosis of tuberculosis (TB). By utilizing the surface plasmon resonance effect, we were able to monitor changes in the color of a gold nanoparticle colloid based on the effects of single-stranded DNA probe molecules hybridizing with targeted double-stranded TB DNA. The hybridization event changes the surface charge density of the nanoparticles, causing them to aggregate to various degrees, which modifies the color of the solution in a manner that can be readily measured to determine the concentration of the targeted DNA analyte...
September 13, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28899632/the-deposition-of-anti-dna-igg-contributes-to-the-development-of-cutaneous-lupus-erythematosus
#18
Yingying Dong, Yi Zhang, Linlin Xia, Ping Wang, Jingyun Chen, Meifeng Xu, Xingyin Liu, Yumin Xia
Anti-DNA IgG is a hallmark serum of systemic lupus erythematosus and induces internal injuries in patients. It is known that cutaneous lupus erythematosus (CLE) involves the deposition of autoantibodies in the dermoepidermal junction of the skin and that anti-DNA IgG binds specifically to keratinocytes. However, the definite role of anti-DNA IgG in CLE remains unclear. The purpose of this study was to elucidate the effect of anti-DNA IgG on keratinocytes in CLE. Skin tissues were collected from patients with CLE and healthy controls...
September 9, 2017: Immunology Letters
https://www.readbyqxmd.com/read/28898551/elucidation-of-glcnac-binding-properties-of-type-iii-intermediate-filament-proteins-using-glcnac-bearing-polymers
#19
Hirohiko Ise, Sadanori Yamasaki, Kazuaki Sueyoshi, Yoshiko Miura
Vimentin, desmin, glial fibrillary acidic protein (GFAP) and peripherin belong to type III intermediate filament family and are expressed in mesenchymal cells, skeletal muscle cells, astrocytes and peripheral neurons, respectively. Vimentin and desmin possess N-acetyl-d-glucosamine (GlcNAc)-binding properties on cell surfaces. The rod II domain of these proteins is a GlcNAc-binding site, which also exists in GFAP and peripherin. However, the GlcNAc-binding activities and behaviors of these proteins remain unclear...
September 12, 2017: Genes to Cells: Devoted to Molecular & Cellular Mechanisms
https://www.readbyqxmd.com/read/28898093/synthesis-of-stable-citrate-capped-silver-nanoprisms
#20
Jason M Haber, Konstantin Sokolov
Citrate-stabilized silver nanoprisms (AgNPrs) can be easily functionalized using well-developed thiol based surface chemistry that is an important requirement for biosensor applications utilizing localized surface plasmon resonance (LSPR) and surface-enhanced Raman Scattering (SERS). Unfortunately, currently available protocols for synthesis of citrate-coated AgNPrs do not produce stable nanoparticles thus limiting their usefulness in biosensing applications. Here we address this problem by carrying out a systematic study of citrate-stabilized, peroxide-based synthesis of AgNPrs to optimize reaction conditions for production of stable and reproducible nanoprisms...
September 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
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