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Blue nanoparticles

Venkidasamy Baskar, Safia Nayeem, Sree Preethy Kuppuraj, Thiruvengadam Muthu, Sathishkumar Ramalingam
Nanoparticles (NPs) are widely used in various domestic products and their usage is constantly increasing which in turn can raise several environmental health issues. Like other abiotic stresses, nanomaterials also affect the growth of crop plants. Solanum melongena is a common vegetable crop grown in the tropics and subtropics regions with medicinal properties. In this study, S. melongena was analyzed for its response to three commercially important metallic nanoparticles, namely NiO, CuO, and ZnO, at four different concentrations (100, 250, 500 and 1000 mg/L)...
August 2018: 3 Biotech
Joseph Adetunji Elegbede, Agbaje Lateef, Musibau Adewuyi Azeez, Tesleem Babatunde Asafa, Taofeek Akangbe Yekeen, Iyabo Christianah Oladipo, Elijah Adegoke Adebayo, Lorika Selomi Beukes, Evariste Bosco Gueguim-Kana
Green synthesis of nanoparticles has fuelled the use of biomaterials to synthesise a variety of metallic nanoparticles. The current study investigates the use of xylanases of Aspergillus niger L3 (NEA) and Trichoderma longibrachiatum L2 (TEA) to synthesise silver nanoparticles (AgNPs). Characterisation of AgNPs was carried out using UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy, while their effectiveness as antimicrobial, antioxidant, catalytic, anticoagulant, and thrombolytic agents were determined...
September 2018: IET Nanobiotechnology
Ahmed Hamdy, Mohamed K Mostafa, Mahmoud Nasr
Nanoscale zero-valent iron (nZVI) particles were investigated for the removal of methylene blue (MB) from aqueous solutions and the treatment of textile industry effluents. The nZVI material was characterized by XRD, TEM, EDS, FTIR, and SEM. It was demonstrated that several functional groups such as C-H, C = C, C-C, and C-O contributed to MB reduction. At initial MB concentration of 70 mg/L, the optimum pH was 6, achieving a removal efficiency of 72.1% using an nZVI dosage of 10 g/L, stirring rate of 150 rpm, and temperature of 30 °C within 30 min...
August 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Nor Diyana Md Sani, Lee Yook Heng, Radha Swathe Priya Malon Marugan, Nor Fadilah Rajab
The presence of carcinogens in food is a major food safety concern. A nanocomposite-based electrochemical DNA biosensor was constructed for potential carcinogen detection in food samples by immobilizing amine terminated single stranded DNA onto silica nanospheres deposited onto a screen-printed electrode modified using gold nanoparticles. The effect of three different DNA sequences: 15-base guanine, 24-base guanine and 24-base adenine-thymine rich DNA on carcinogen (formaldehyde and acrylamide) detection was evaluated...
December 15, 2018: Food Chemistry
Jing Wang, Haigang Li, Tingting Li, Liansheng Ling
A one-step, one-tube colorimetric assay is described for the detection of bacterial double-stranded DNA (dsDNA). It utilizes a G-quadruplex DNAzyme produced by an asymmetric polymerase chain reaction (As-PCR) that catalyzes the oxidation of cysteine to form cystine. This results in the formation of oligonucleotide-modified gold nanoparticles via triplex formation, and eventually in a color change from red to blue that occurs within about 10 mins. This can be measured by ratiometric colorimetric (at 525 and 600 nm)...
August 11, 2018: Mikrochimica Acta
Yu Liu, Xu-Man Chen, Yong Chen, Qilin Yu, Bo-Han Gu
Organelle-targeted cell imaging still remains a key challenge in supramolecular chemistry in recent years. Herein, we report a two-stage mediated near-infrared (NIR) emissive supramolecular assembly for lysosome-targeted cell imaging. In this system, 4,4'-anthracene-9,10-diylbis(ethene-2,1-diyl))bis(1-ethylpyridin-1-ium) bromide (ENDT) has been synthesized as an organic dye with weak fluorescence emission at 625nm. When ENDT complexes with cucurbit[8]uril (CB[8]), this binary supramolecular complex assembles into nanorods and achieve a near-infrared fluorescence emission (655 nm) and fluorescence enhancement as the first stage...
August 11, 2018: Angewandte Chemie
Cristina Lorente, Laura Cabeza, Beatriz Clares, Raúl Ortiz, Lyda Halbaut, Ángel V Delgado, Gloria Perazzoli, José Prados, José L Arias, Consolación Melguizo
Magnetoliposomes (MLPs) offer many new possibilities in cancer therapy and diagnosis, including the transport of antitumor drugs, hyperthermia treatment, detection using imaging techniques, and even cell migration. However, high biocompatibility and functionality after cell internalization are essential to their successful application. We synthesized maghemite nanoparticles (γ-Fe2 O3 ) by oxidizing magnetite cores (Fe3 O4 ) and coating them with phosphatidylcholine (PC) liposomes, obtained using the thin film hydration method, to generate MLPs...
July 31, 2018: Colloids and Surfaces. B, Biointerfaces
Lei Zhang, Lihong Sun, Mengmeng Hou, Zhigang Xu, Yuejun Kang, Peng Xue
Temperature is a critical extrinsic physical parameter that determines cell fate. Hyperthermia therapy has become an efficient treatment for tumor ablation. To understand the response of tumor cells under thermal shocks, we present a paper-based photothermal array that can be conveniently coupled with commercial 96-well cell culture plates. This paper chip device was fabricated in one step using Parafilm® and Kimwipers® based on a heat lamination strategy. Liquid was completely adsorbed and confined within the cellulose fibres of hydrophilic regions...
August 9, 2018: Biomedical Microdevices
Mahsa Sarami Foroshani, Zeinab Sadat Sobhani, Mohammad Taghi Mohammadi, Masiha Aryafar
BACKGROUND: The present study aimed to examine the protective role of fullerenol nanoparticles against blood-brain barrier (BBB) interruption and brain edema during cerebral ischemia-reperfusion injury probably by reduction of interleukin-6 (IL-6) and matrix metalloproteinase-9 (MMP-9) transcription. METHODS: The male Wistar rats (weighting 280-320 g) were randomly assigned into four groups as follows: sham, control ischemic, pretreated ischemic, and posttreated ischemic groups...
August 6, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Zhen Su, Jing Li, Dandan Zhang, Pin Ye, Heping Li, Youwei Yan
Free-standing and flexible Cu@CuO nanowires (NWs) mesh as an easily recycled Fenton-like catalyst is developed for the first time. Dense CuO nanowire arrays were uniformly grown on a copper mesh surface simply by wet etching accompanied with thermal dehydration. These dense CuO NWs provide a large specific area and therefore guarantee excellent catalytic performance toward the degradation of rhodamine B (RhB). With a k-value of 0.23 min-1 , such a Cu@CuO NWs mesh is able to degrade 100% RhB in only 16 min...
August 3, 2018: Science of the Total Environment
Sumita Das, Soumita Mukhopadhyay, Sabyasachi Chatterjee, Parukuttyamma Sujatha Devi, Gopinatha Suresh Kumar
In this work, we report the interaction of a fluorescent ZnO-Au nanocomposite with deoxyribonucleic acid (DNA), leading to AT-specific DNA interaction, which is hitherto not known. For this study, three natural double-stranded (ds) DNAs having different AT:GC compositions were chosen and a ZnO-Au nanocomposite has been synthesized by anchoring a glutathione-protected gold nanocluster on the surface of egg-shell-membrane (ESM)-based ZnO nanoparticles. The ESM-based bare ZnO nanoparticles did not show any selective interaction toward DNA, whereas intrinsic fluorescence of the ZnO-Au nanocomposite shows an appreciable blue shift (Δλmax = 18 nm) in the luminescence wavelength of 520 nm in the presence of ds calf thymus (CT) DNA over other studied DNAs...
July 31, 2018: ACS Omega
Ali Saafan, Mohamed H Zaazou, Marwa K Sallam, Osama Mosallam, Heba A El Danaf
AIM: To assess the antibacterial competence of 650 nm diode laser, Methylene Blue (MB) and Silver Nano-Particles (Ag NPs) on Streptococcus mutans in biofilm-induced caries models. MATERIAL AND METHODS: One hundred eighty specimens were prepared and equally divided into 6 groups. One group was untreated (control), and the others were subjected to either MB, laser, Ag NPs, the combination of MB and Laser or MB, laser and Ag NPs. RESULTS: Comparison of the log10 mean Colony Forming Units per millilitre (CFU/ml) values of each of the treated 5 groups and the control group was found statistically significant (P-value < 0...
July 20, 2018: Open Access Macedonian Journal of Medical Sciences
Francisco A Cunha, Maria da C S O Cunha, Sabrina M da Frota, Eduardo J J Mallmann, Tiago M Freire, Luelc S Costa, Amauri J Paula, Everardo A Menezes, Pierre B A Fechine
Silver nanoparticles (AgNPs) have several technological applications and may be synthetized by chemical, physical and biological methods. Biosynthesis using fungi has a wide enzymatic range and it is easy to handle. However, there are few reports of yeasts with biosynthetic ability to produce stable AgNPs. The purpose of this study was to isolate and identify soil yeasts (Rhodotorula glutinis and Rhodotorula mucilaginosa). After this step, the yeasts were used to obtain AgNPs with catalytic and antifungal activity evaluation...
August 6, 2018: World Journal of Microbiology & Biotechnology
Mahdi Zarrabi, Mohammad Haghighi, Reza Alizadeh
In this paper, ZnO/Graphene Oxide (ZnO/GO) is synthesized via ultrasound assisted precipitation method and the effect of power and ultrasound time irradiation is studied on photocatalyst properties. The synthesized samples are used for methylene blue (MB) degradation as an organic water pollutant. Physicochemical properties of the samples are investigated by XRD, FESEM, EDX, BET-BJH, FTIR and DRS techniques. Moreover, pHpzc of the sample with the best performance is calculated to study the effect of acidity on the photocatalyst efficiency in photocatalytic process...
November 2018: Ultrasonics Sonochemistry
Yang Peng, Huawei Shen, Sitian Tang, Zhenglan Huang, Yixiong Hao, Zhenhong Luo, Fangzhu Zhou, Teng Wang, Wenli Feng
A colorimetric assay is described for the detection of BCR/ABL fusion genes. Polyamidoamine (PAMAM) dendrimers were placed on peroxidase (POx) mimicking Au@Pt nanoparticles to form a nanocomposite of type Au@Pt-PAMAM. Capture DNA probe is a designed nucleic acid strand that specifically binds target DNA to the surface of the electrode. The capture probe was attached to magnetic beads via biotin and avidin interaction. The hairpin structure of the capture probe can only be opened by the complementary BCR/ABL DNA...
August 4, 2018: Mikrochimica Acta
Yan Leng, Chenjun Zhang, Bing Liu, Miaomiao Liu, Pingping Jiang, Sheng Dai
Palladium nanoparticles (Pd NPs) anchored on a phosphotungstic acid-attached melem porous hybrid (PW/melem) are prepared by hybridization of phosphotungstic acid palladium salt and melem, followed by chemical reduction. PW/melem is demonstrated to be an outstanding support that can stabilize and disperse small Pd NPs (2 nm), and significantly boost their efficiency for H2 generation from dehydrogenation of formic acid (FA). Experimental results and mechanistic investigations indicate that a strong electron interaction exists between Pd NPs and the PW anions; the PW anions accept electrons from Pd first and, during FA dehydrogenation, the reduced blue PW donates electrons to Pd...
August 3, 2018: ChemSusChem
Maryam Maghsudi, Nahid Shahabadi, Mohammad Reza Ashrafi Kooshk, Negin Ghaemi, Leila Nemati, Shahram Parvaneh, Khosrow Adeli, Kambiz Varmira
In recent years, concerns have been raised considering the potential risks of nanocluster (NC) for the environment and human health. Since the blood circulation system is probably the first entry route of NC into the human body, adsorption of blood proteins on NC may change cellular responses, including cellular uptake efficiency, bio distribution patterns, and nanotoxicity profiles, besides other biological effects. Therefore, the interaction of NCs with proteins and the cellular implications can be therapeutically of great importance...
July 29, 2018: International Journal of Biological Macromolecules
Rang Li, Chi Pang, Hiroshi Amekura, Feng Ren, René Hübner, Shengqiang Zhou, Norito Ishikawa, Nariaki Okubo, Feng Chen
We report on the fabrication of reshaped Ag nanoparticles (NPs) embedded in a Nd:YAG crystal by combining Ag ion implantation and swift heavy Xe ion irradiation. The localized surface plasmon resonance (LSPR) effect is proved to be efficiently modulated according to the phenomenon of polarization-dependent absorption. The LSPR peak located at 448 nm shows red shift and blue shift at 0° and 90° polarization, respectively, which is in good agreement with calculation by discrete dipole approximation (DDA). Based on the near-field intensity distribution, the interaction between reshaped NPs shows a non-ignorable effect on the optical absorption...
August 1, 2018: Nanotechnology
Hee-Man Yang, Ju Ri Hwang, Dong Yeop Lee, Kyu Beom Kim, Chan Woo Park, Hee Reyoung Kim, Kune-Woo Lee
A simple one-step approach to fabricating Prussian blue-embedded magnetic hydrogel beads (PB-MHBs) was fabricated for the effective magnetic removal of radioactive cesium (137 Cs) from water. Through the simple dropwise addition of a mixed aqueous solution of iron salts, commercial PB and polyvinyl alcohol (PVA) to an ammonium hydroxide (NH4 OH) solution, the formation of hydrogel beads and the encapsulation of PB in beads were achieved in one pot through the gelation of PVA with in situ-formed iron oxide nanoparticles as the cross-linker...
July 31, 2018: Scientific Reports
Rui Wang, Volkan Degirmenci, Hongchuan Xin, Ying Li, Liping Wang, Jiayu Chen, Xiaoyu Hu, Dianbao Zhang
Glioblastomas (GBM) are the most frequent brain tumors lacking efficient treatment. The increasingly elucidated gene targets make siRNA-based gene therapy a promising anticancer approach, while an efficient delivery system is urgently needed. Here, polyethyleneimine (PEI)-coated Fe₃O₄ nanoparticles (NPs) have been developed and applied for siRNA delivery into GBM cells to silence repressor element 1-silencing transcription factor (REST). The prepared PEI-coated Fe₃O₄ NPs were characterized as magnetic nanoparticles with a positive charge, by transmission electronic microscopy, dynamic light-scattering analysis and a magnetometer...
July 31, 2018: International Journal of Molecular Sciences
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