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https://www.readbyqxmd.com/read/29223055/structure-elucidation-and-degradation-kinetic-study-of-ofloxacin-using-surface-enhanced-raman-spectroscopy
#1
Marwa R El-Zahry, Bernhard Lendl
A simple, fast and sensitive surface enhanced Raman spectroscopy (SERS) method for quantitative determination of fluoroquinolone antibiotic Ofloxacin (OFX) is presented. Also the stability behavior of OFX was investigated by monitoring the SERS spectra of OFX after various degradation processes. Acidic, basic and oxidative force degradation processes were applied at different time intervals. The forced degradation conditions were conducted and followed using SERS method utilizing silver nanoparticles (Ag NPs) as a SERS substrate...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29223051/ultrasensitive-colorimetric-immunoassay-for-hcg-detection-based-on-dual-catalysis-of-au-pt-core-shell-nanoparticle-functionalized-by-horseradish-peroxidase
#2
Weiguo Wang, Yake Zou, Jinwu Yan, Jing Liu, Huixiong Chen, Shan Li, Lei Zhang
In this paper, an ultrasensitive colorimetric biosensor for human chorionic gonadotrophin (hCG) detection was designed from bottom-up method based on the dual catalysis of the horseradish peroxidase (HRP) and Au@Pt nanoparticles (NPs) relative to H2O2-TEM system. HRP and monoclonal mouse anti-hCG antibody (β-submit, mAb1) were co-immobilized onto the Au@Pt NP surface to improve catalytic efficiency and specificity, which formed a dual functionalized Au@Pt-HRP probe with the mean size of 42.8nm (D50). The colorimetric immunoassay was developed for the hCG detection, and the Au@Pt-HRP probe featured a higher sensitivity in the concentration range of 0...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29222976/enhanced-electrocatalytic-activity-and-stability-of-monodisperse-pt-nanocomposites-for-direct-methanol-fuel-cells
#3
Sinan Eris, Zeynep Daşdelen, Fatih Sen
Direct methanol fuel cells (DMFCs) are one of the most important fuel cells operating at low temperature using methanol as fuel and they need very efficient catalysts to activate the methanol. Generally, the most efficient fuel cell catalysts are platinum-based nanoparticles that can be used by different supporting materials such as different as prepared and functionalized carbon derivatives. For this purpose, herein, the carbon black has been mainly functionalized with an acidification process in order to increase the electrical conductivity and heterogeneous electron transfer rate of supporting materials...
December 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29222658/phytotoxic-effects-of-silver-nanoparticles-in-tobacco-plants
#4
Petra Cvjetko, Mira Zovko, Petra Peharec Štefanić, Renata Biba, Mirta Tkalec, Ana-Marija Domijan, Ivana Vinković Vrček, Ilse Letofsky-Papst, Sandra Šikić, Biljana Balen
The small size of nanoparticles (NPs), with dimensions between 1 and 100 nm, results in unique chemical and physical characteristics, which is why they are implemented in various consumer products. Therefore, an important concern is the potential detrimental impact of NPs on the environment. As plants are a vital part of ecosystem, investigation of the phytotoxic effects of NPs is particularly interesting. This study investigated the potential phytotoxicity of silver nanoparticles (AgNPs) on tobacco (Nicotiana tabacum) plants and compared it with the effects of the same AgNO3 concentrations...
December 8, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29222019/a-novel-use-of-cellulose-based-filter-paper-containing-silver-nanoparticles-for-its-potential-application-as-wound-dressing-agent
#5
Adnan Haider, Sajjad Haider, Inn-Kyu Kang, Anuj Kumar, Madhusudana Rao Kummara, Tahseen Kamal, Sung Soo Han
The frequent use of antibiotics against microbial infections may lead the emergence of antibiotic resistant microbial strains. To overcome these microbial strains, we need to fabricate alternative materials which can handle them. It is for this reason, we have fabricated cellulose (CE) based filter paper (FP) composite scaffolds comprising of adsorbed chitosan (CS) and sliver (Ag) nanoparticles (NPs). The AgNPs are incorporated in the CS layer of the composite scaffold. Prior to evaluate the efficacy of the scaffolds against gram positive and gram negative bacterial strains, the scaffolds were characterized for the presence of the Ag NPs with field emission scanning electron microscope (FE-SEM), fourier transform infrared (FTIR) spectroscopy and x-ray diffractometer (XRD)...
December 5, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29220865/silver-nano-particles-ameliorate-learning-and-spatial-memory-of-male-wistar-rats-by-prevention-of-amyloid-fibril-induced-neurotoxicity
#6
H Ramshini, A-S Moghaddasi, L-S Aldaghi, N Mollania, A Ebrahim-Habibi
Alzheimer's disease (AD) is a chronic degenerative disease characterized by the presence of amyloid plaques and neurofibrillary tangles (NFTs), which results into memory and learning impairments. In the present study, we showed that the aggregates formed by a protein that has no link with Alzheimer's disease, namely the hen egg white lysozyme (HEWL), were cytotoxic and decreased spatial learning and memory in rats. The effect of Ag-nano particles (Ag-NPs) was investigated on disruption of amyloid aggregation and preservation of cognitive behavior of rats...
December 8, 2017: Archives Italiennes de Biologie
https://www.readbyqxmd.com/read/29220816/ftir-and-raman-spectroscopic-studies-of-selenium-nanoparticles-synthesised-by-the-bacterium-azospirillum-thiophilum
#7
Anna V Tugarova, Polina V Mamchenkova, Yulia A Dyatlova, Alexander A Kamnev
Vibrational (Fourier transform infrared (FTIR) and Raman) spectroscopic techniques can provide unique molecular-level information on the structural and compositional characteristics of complicated biological objects. Thus, their applications in microbiology and related fields are steadily increasing. In this communication, biogenic selenium nanoparticles (Se NPs) were obtained via selenite (SeO32-) reduction by the bacterium Azospirillum thiophilum (strain VKM B-2513) for the first time, using an original methodology for obtaining extracellular NPs...
November 23, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29220804/graphene-and-au-nps-co-mediated-enzymatic-silver-deposition-for-the-ultrasensitive-electrochemical-detection-of-cholesterol
#8
Yong Huang, Jie Tan, Lijie Cui, Zhide Zhou, Sufang Zhou, Zhenghua Zhang, Rong Zheng, Yewei Xue, Mengxin Zhang, Shanshan Li, Nixuan Zhu, Jintao Liang, Guiyin Li, Liping Zhong, Yongxiang Zhao
Cholesterol is an essential ingredient in mammals, and serum cholesterol is a major component of atherosclerotic plaques. The level of cholesterol in human serum has become an important index for clinical diagnosis and prevention of cardiovascular disease. In this paper, a simple and ultrasensitive cholesterol biosensor based on graphene oxide (GO) and gold nanoparticles (Au NPs) co-mediated enzymatic silver deposition was designed by immobilizing cholesterol oxidase (CHOD), cholesterol esterase (CHER) and GO onto the surface of Au NPs modified screen-printed carbon electrode (SPE)...
November 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29220765/transient-disturbance-of-engineered-zno-nanoparticles-enhances-the-resistance-and-resilience-of-anammox-process-in-wastewater-treatment
#9
Zheng-Zhe Zhang, Ya-Fei Cheng, Lian-Zeng-Ji Xu, Yu-Hui Bai, Jia-Jia Xu, Zhi-Jian Shi, Qian-Qian Zhang, Ren-Cun Jin
The increasing use of engineered nanoparticles (NPs) in consumer and industrial products raises concerns about their environmental impacts, but their potential influence on anaerobic ammonium oxidation (anammox) process in wastewater treatment remains unknown. In this study, the response of granule-based anammox reactor to different loads of ZnONPs was investigated. The introduction of 1-5mgL-1 ZnONPs did not affect reactor performance, but 90% of the nitrogen removal capacity was deprived by a shock of 10mgL-1 ZnONPs within 3days...
December 5, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29220168/a-hybrid-structure-of-2d-layered-gate-with-au-nanoparticles-for-ultra-sensitive-detection-of-aromatic-molecules
#10
Pengqi Lu, Jiawei Lang, Zeping Weng, Arash Rahimi-Iman, Huizhen Wu
Owing to a complex monocline structure and high-density of defects in monocrystalline GaTe, the performance of GaTe-based electronic devices is considerably compromised. Yet, the defects' nature in GaTe could be a merit rather than a shortcoming in other realms. In our work, the density of defects in GaTe films is utilized for a facile decoration of Au nanoparticles (NPs), which allowed us to extend its application potential to the domain of surface enhanced Raman scattering (SERS) for the first time. Two-dimensional (2D) GaTe layered structures are prepared by mechanical exfoliation and high-density Au NPs are synthesized by immersion of 2D GaTe in HAuCl4 aqueous solution...
December 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29220160/plant-protein-directed-synthesis-of-luminescent-gold-nanoclusters-hybrids-for-tumor-imaging
#11
Zhao Li, Haibao Peng, Jialin Liu, Ye Tian, Wuli Yang, Jinrong Yao, Zhengzhong Shao, Xin Chen
Nowadays, fluorescence detection has emerged as one of the most frequently used non-invasive biosensing method to selectively monitor biological processes within living systems. Among fluorescent nanoparticles, gold nanoclusters (AuNCs) have been intensively studied because of their intrinsic fluorescence and their endowed biocompatible surface. Herein, we selected an abundant, low-cost and sustainable plant protein, the pea protein isolate (PPI) for its excellent biocompatibility, biodegradability, and non-allergenic character, to be employed as both a reducing and stabilizing agent to facilely produce AuNCs exhibiting a strong red fluorescence...
December 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29220101/report-of-aapm-task-group-162-software-for-planar-image-quality-metrology
#12
Ehsan Samei, Lynda C Ikejimba, Brian P Harrawood, John Rong, Ian A Cunningham, Michael J Flynn
PURPOSE: The AAPM Task Group 162 aimed to provide a standardized approach for the assessment of image quality in planar imaging systems. This report offers a description of the approach as well as the details of the resultant software bundle to measure detective quantum efficiency (DQE) as well as its basis components and derivatives. METHODS: The methodology and the associated software include the characterization of the noise power spectrum (NPS) from planar images acquired under specific acquisition conditions, modulation transfer function (MTF) using an edge test object, the DQE, and effective DQE (eDQE)...
December 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/29219802/in-situ-high-resolution-transmission-electron-microscopy-tem-observation-of-sn-nanoparticles-on-sno2-nanotubes-under-lithiation
#13
Jun Young Cheong, Joon Ha Chang, Sung Joo Kim, Chanhoon Kim, Hyeon Kook Seo, Jae Won Shin, Jong Min Yuk, Jeong Yong Lee, Il-Doo Kim
We trace Sn nanoparticles (NPs) produced from SnO2 nanotubes (NTs) during lithiation initialized by high energy e-beam irradiation. The growth dynamics of Sn NPs is visualized in liquid electrolytes by graphene liquid cell transmission electron microscopy. The observation reveals that Sn NPs grow on the surface of SnO2 NTs via coalescence and the final shape of agglomerated NPs is governed by surface energy of the Sn NPs and the interfacial energy between Sn NPs and SnO2 NTs. Our result will likely benefit more rational material design of the ideal interface for facile ion insertion...
December 8, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/29219055/the-role-of-nanoparticles-in-the-inhibition-of-multidrug-resistant-bacteria-and-biofilms
#14
Manaf AlMatar, Essam A Makky, Isil Var, Fatih Koksal
BACKGROUND: Until recently, one of the main reasons for mortality has been infectious diseases, and bacteria that are drug-resistant have emerged as a result of the wide application, as well as the misuse, of antibacterial medications. Having multidrug-resistance, bacteria present a great problem for the efficient management of bacterial infections and this challenge has resulted in the creation of other means of dealing with bacterial diseases. Of late, metallic nanoparticles (NPs), employed as antibacterial agents, have the potential for use against resistance to bacterial drugs...
December 7, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29218583/promising-antibacterial-effects-of-silver-nanoparticle-loaded-tea-tree-oil-nanoemulsion-a-synergistic-combination-against-resistance-threat
#15
Roqya Najafi-Taher, Behnaz Ghaemi, Sharmin Kharazi, Samira Rasoulikoohi, Amir Amani
Highly resistant pathogens may be developed in patients with immune disorders after prolonged exposure to antibiotics, a growing threat worldwide. In order to overcome these problems, this study introduces a new class of engineered nanosystems comprising of tea tree oil nanoemulsion (TTO NE) loaded with Ag nanoparticles (NPs). Silver shows a strong toxicity towards a wide range of microorganisms. Also, TTO NE could be employed as a promising and safe antimicrobial agent for local therapies of bacterial infections...
December 7, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29218349/core-hydrophobicity-tuning-of-a-self-assembled-particle-results-in-efficient-lipid-reduction-and-favorable-organ-distribution
#16
Bhabatosh Banik, Ru Wen, Sean Marrache, Anil Kumar, Nagesh Kolishetti, Elizabeth W Howerth, Shanta Dhar
Atherosclerosis, the deadliest disease in the United States, arises due to the build up of plaques in the arteries as a result of excessive cholesterol deposition and an impaired cholesterol removal process. High density lipoproteins (HDL), popularly known as "good cholesterol", are naturally occurring nano-sized particles that, along with apolipoproteins, are deployed to maintain cholesterol homeostasis in the body. Both cholesterol efflux, from the fat-laden macrophages in the arteries, and intracellular lipid transport, to deliver cholesterol to the mitochondria of liver cells for metabolism, hold key responsibilities to maintain healthy lipid levels inside the body...
December 8, 2017: Nanoscale
https://www.readbyqxmd.com/read/29216803/neutrophil-mediated-delivery-of-nanotherapeutics-across-blood-vessel-barrier
#17
Xinyue Dong, Dafeng Chu, Zhenjia Wang
Nanotherapeutics, nanoparticles (NPs) loaded with drugs, show the ability of tissue targeting, long circulation and low toxicity compared with free drugs. Endothelium lying the lumen of a blood vessel is a barrier to restrain tissue deposition of nanotherapeutics. Neutrophils, a type of white blood cells, migrate across endothelium during inflammation. There is an emerging concept that in situ targeting of neutrophils allows delivery of nanotherapeutics into deep tissues at disease sites. Here we summarize the recent advances in delivery of nanotherapeutics to inflammatory tissues or tumor microenvironments via neutrophil infiltration...
January 2018: Therapeutic Delivery
https://www.readbyqxmd.com/read/29216713/poly-2-oxazoline-pterostilbene-block-copolymer-nanoparticles-for-dual-anticancer-drug-delivery
#18
Matteo Romio, Giulia Morgese, Lucca Trachsel, Samuel Babity, Cristina Paradisi, Davide Brambilla, Edmondo Maria Benetti
Functional block-copolymers based on poly(2-oxazoline)s are versatile building blocks for the fabrication of dual-drug delivery nanoparticles (NPs) that show promising properties for the development of a anticancer chemotherapy. Core-shell NPs are fabricated from diblock-copolymers featuring a long and hydrophilic poly(2-methyl-2-oxazoline) (PMOXA) block, coupled to a relatively short and functionalizable poly(2-methylsuccinate-2-oxazoline) (PMestOXA) segment. The PMOXA block stabilizes the NP dispersions, whereas the PMestOXA segment is used to conjugate pterostilbene (PTS), a natural bioactive phenolic compound that is used as lipophilic model-drug and constitutes the hydrophobic core of the designed NPs...
December 7, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29216523/use-of-synthetic-stimulants-and-hallucinogens-in-a-cohort-of-electronic-dance-music-festival-attendees
#19
Amanda L A Mohr, Melissa Friscia, Jillian K Yeakel, Barry K Logan
Novel psychoactive substances (NPS), often characterized as unregulated psychoactive compounds designed to circumvent existing legislation, have become mainstream on the illicit drug market. Because of their physical and mind-altering properties, NPS may be deliberately or inadvertently ingested at electronic dance music (EDM) festivals to enhance the attendees' appreciation of the music and overall experience. Their widespread use at EDM festivals have been well documented and several adverse events and fatalities associated with NPS ingestion have been reported in the United States...
November 21, 2017: Forensic Science International
https://www.readbyqxmd.com/read/29216517/go-agcl-ag-nanocomposites-with-enhanced-visible-light-driven-catalytic-properties-for-antibacterial-and-biofilm-disrupting-applications
#20
Xinhuan Wang, Qiusen Han, Ning Yu, Tian Wang, Chen Wang, Rong Yang
Nanomaterials with visible light-driven photocatalytic activity have attracted much attention due to their excellent abilities in degradation of various organic pollutants as well as inactivating bacteria. Herein, graphene oxide (GO) enwrapped silver chloride/silver (AgCl/Ag) nanocomposites with high visible light absorption were designed and fabricated as efficient antibacterial agents. AgCl NPs were synthesized in the presence of GO first and Ag NPs were coated on AgCl surface by heat reduction to form GO-AgCl/Ag nanocomposites...
November 26, 2017: Colloids and Surfaces. B, Biointerfaces
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