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https://www.readbyqxmd.com/read/29778081/molecular-aspect-of-silver-nanoparticles-regulated-embryonic-development-in-zebrafish-danio-rerio-by-oct-4-expression
#1
Biplab Sarkar, Suresh K Verma, Javed Akhtar, Surya Prakash Netam, Sanjay Kr Gupta, Pritam Kumar Panda, Koel Mukherjee
With the enhancement of commercial manifestation of silver nanoparticles, concerned has risen on their accumulation in aquatic system and consequent effects on fish development and metabolism. In this study, experiments were conducted to assess the impacts of silver nanoparticles on early life cycles of fish considering Zebrafish (Danio rerio) as experimental model. Silver nanoparticles were synthesized through chemical reduction method and characterized through UV-visible spectroscopy, dynamic light scattering (DLS), and HR-TEM...
May 4, 2018: Chemosphere
https://www.readbyqxmd.com/read/29777812/exploring-the-intermolecular-interactions-and-contrasting-binding-of-flufenamic-acid-with-hemoglobin-and-lysozyme-a-biophysical-and-docking-insight
#2
Sameer Shakeel Ansari, Imtiyaz Yousuf, Farukh Arjmand, Mohammad Khursheed Siddiqi, Saeeda Naqvi
The intermolecular interaction of flufenamic acid (Hfluf) with two model proteins i.e., hemoglobin and lysozyme was explored using fluorescence, UV-vis, circular dichroism, DLS, and molecular docking techniques. The corroborative spectroscopic techniques suggested efficient binding of Hfluf to both the proteins. The S-V plot in Hb-Hfluf system showed positive deviation highlighting the presence of both static and dynamic quenching. Hence, ground state complex model and sphere of action quenching model were used for the study...
May 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29776455/optimization-and-validation-of-an-analytical-method-for-the-determination-of-some-trace-and-toxic-elements-in-canned-fruit-juices-using-quadrupole-inductively-coupled-plasma-mass-spectrometer
#3
Eglal R Souaya, Mona A Khorshed, Mahmoud M Ghuniem
Background: There is increasing concern about the health effects on humans due to continuous consumption of fruit juices contaminated with metals. Objective: Quadrupole inductively coupled mass spectrometry (Q-ICP-MS) was optimized, validated, and applied in routine analysis for determination of As, Pb, Cd, Sb, Hg, Cu, Zn, Fe, Al, Cr, Sn, Co, Mn, and Ni in fruit juice beverages. Methods: Several validation parameters, such as detection limits (DLs), quantification limits, linearity, accuracy, and measurement uncertainty (MU), were studied under optimized Q-ICP-MS conditions...
May 18, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29775817/janus-graphene-oxide-nanosheet-a-promising-additive-for-enhancement-of-polymeric-membranes-performance-prepared-via-phase-inversion
#4
Mahdi Akbari, Mojtaba Shariaty-Niassar, Takeshi Matsuura, Ahmad Fauzi Ismail
Although polymeric membranes find important role in water and waste water treatment in recent years, their fouling is still an important problem. Application of hydrophilic nanoparticles (NPs) is one of the proposed methods for reducing fouling of membranes but their dispersion and stability in hydrophobic polymer matrix is challenging. In this study Janus functionalization of the NPs was introduced as a promising technique toward achieving this goal. Polysulfone (PSf) membranes containing various concentrations of graphene oxide (GO) nanosheets and Janus graphene oxide (Janus GO) nanosheets (as additives) were fabricated via phase inversion...
May 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29774066/caveolae-mediated-mesenchymal-stem-cell-labelling-by-pss-coated-plga-pfob-nano-contrast-agent-for-mri
#5
Hieu Vu Quang, Chi-Chih Chang, Ping Song, Ellen-Margrethe Hauge, Jørgen Kjems
Rationale: Non-invasive tracking of transplanted cells is critical in evaluating delivery, migration and prognosis of cell therapies. Methods: We formulated a nano-contrast agent consisting of a perfluorooctylbromide (PFOB) core within a shell of poly (lactic-co-glycolic acid) (PLGA) followed by a coat of polystyrene sulfonate (PSS) for 19 F MRI. The nano-contrast agent (PSS-NP) was characterised by DLS and the uptake efficiency of the nano-contrast agent (PSS-NP) was tested using flow cytometry, in vitro MRI and confocal microscopy...
2018: Theranostics
https://www.readbyqxmd.com/read/29773989/the-cytotoxic-effects-of-betulin-conjugated-gold-nanoparticles-as-stable-formulations-in-normal-and-melanoma-cells
#6
Marius Mioc, Ioana Zinuca Pavel, Roxana Ghiulai, Dorina E Coricovac, Claudia Farcaş, Ciprian-Valentin Mihali, Camelia Oprean, Vlad Serafim, Ramona A Popovici, Cristina A Dehelean, Michael I Shtilman, Aristidis M Tsatsakis, Codruţa Şoica
Gold nanoparticles are currently investigated as theranostics tools in cancer therapy due to their proper biocompatibility and increased efficacy related to the ease to customize the surface properties and to conjugate other molecules. Betulin, [lup-20(29)-ene-3β, 28-diol], is a pentacyclic triterpene that has raised scientific interest due to its antiproliferative effect on several cancer types. Herein we described the synthesis of surface modified betulin-conjugated gold nanoparticles using a slightly modified Turkevich method...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29773395/x-ray-powder-diffraction-and-other-analyses-of-cellulose-nanocrystals-obtained-from-corn-straw-by-chemical-treatments
#7
C C Hernandez, F F Ferreira, D S Rosa
The extraction of nanocellulose from agro-industrial wastes is feasible due to a significant amount of cellulose contained in these natural fibers. The analysis of chemical treatments effects on the fibers to obtain the nanocellulose must be taken into consideration for the definition of an adequate and efficient methodology. In this study, two alkaline treatments were used (cleaning and bleaching), as well as an acid treatment for the extraction of nanocellulose from corn straw residues. The samples were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), dynamic light scattering (DLS) and atomic force microscopy (AFM) to verify the action and modifications caused in their chemical and physical structures...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773363/characterization-of-a-fluorescent-hydrogel-synthesized-using-chitosan-polyvinyl-alcohol-and-9-anthraldehyde-for-the-selective-detection-and-discrimination-of-trace-fe-3-and-fe-2-in-water-for-live-cell-imaging
#8
Santu Maity, Nira Parshi, Chandraday Prodhan, Keya Chaudhuri, Jhuma Ganguly
A three-dimensional fluorescent hydrogel based on chitosan, polyvinyl alcohol and 9-anthraldehyde (ChPA) has been successfully designed and synthesized for the selective detection and discrimination of Fe3+ and Fe2+ in aqueous environment. The unique characteristics of ChPA has been confirmed by the Fourier-transform infrared spectroscopy (FTIR), rheological measurement, scanning electron microscopy (SEM), thermogravimetry and differential thermogravimetry (TG-DTG), ultraviolet-visible spectroscopy (UV-vis), fluorescence studies, transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDX), x-ray diffraction (XRD) and dynamic light scattering (DLS)...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29769108/correlation-between-the-sagittal-spinopelvic-alignment-and-degenerative-lumbar-spondylolisthesis-a-retrospective-study
#9
Qi Lai, Tian Gao, Xin Lv, Xuqiang Liu, Zongmiao Wan, Min Dai, Bin Zhang, Tao Nie
BACKGROUND: Pain and disability associated with degenerative lumbar spondylolisthesis (DLS) results in significant burden on both the patients' quality of life and healthcare costs. Currently, there is controversy regarding the specificity of spinopelvic measures of sagittal plane alignment with respect to DLS. Moreover, the correlation among spinopelvic parameters of sagittal plane alignment remains to be clarified. Our aim in this study was to compare these measurements between patients with single-segment DLS at L5 and a control group with no history of DLS...
May 16, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29768242/antibacterial-anticancer-and-antioxidant-potential-of-silver-nanoparticles-engineered-using-trigonella-foenum-graecum-seed-extract
#10
Shivangi Goyal, Nidhi Gupta, Ajeet Kumar, Sreemoyee Chatterjee, Surendra Nimesh
In this study, the authors report a simple and eco-friendly method for the synthesis of silver nanoparticles (AgNPs) using Trigonella foenum-graecum (TFG) seed extract. They explored several parameters dictating the biosynthesis of TFG-AgNPs such as reaction time, temperature, concentration of AgNO3 , and TFG extract amount. Physicochemical characterisation of TFG-AgNPs was done on dynamic light scattering (DLS), field emission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and Fourier transform infrared spectroscopy...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29768233/biogenic-gold-nanoparticles-for-reduction-of-4-nitrophenol-to-4-aminophenol-an-eco-friendly-bioremediation
#11
Asmathunisha Nabikhan, Suji Rathinam, Kathiresan Kandasamy
The present study investigated the synthesis of gold nanoparticles (AuNPs) using mangrove plant extract from Avicennia marina as bioreductant for eco-friendly bioremediation of 4-nitrophenol (4-NP) . The AuNPs synthesised were confirmed by UV spectrum, transmission electron microscopy (TEM), X-ray diffraction, Fourier transmission infrared spectroscopy (FTIR), dynamic light scattering (DLS), and zeta potential. The AuNPs were found to be spherical in shape with size ranging from 4 to 13 nm, as evident by TEM and DLS...
June 2018: IET Nanobiotechnology
https://www.readbyqxmd.com/read/29767296/evaluating-the-antimicrobial-apoptotic-and-cancer-cell-gene-delivery-properties-of-protein-capped-gold-nanoparticles-synthesized-from-the-edible-mycorrhizal-fungus-tricholoma-crassum
#12
Arpita Basu, Sarmishtha Ray, Supriyo Chowdhury, Arnab Sarkar, Deba Prasad Mandal, Shamee Bhattacharjee, Surekha Kundu
Biosynthesis of gold nanoparticles of distinct geometric shapes with highly functional protein coats without additional capping steps is rarely reported. This study describes green synthesis of protein-coated gold nanoparticles for the first time from the edible, mycorrhizal fungus Tricholoma crassum (Berk.) Sacc. The nanoparticles were of the size range 5-25 nm and of different shapes. Spectroscopic analysis showed red shift of the absorption maxima with longer reaction period during production and blue shift with increase in pH...
May 16, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29766280/novel-insights-into-nucleoamino-acids-biomolecular-recognition-and-aggregation-studies-of-a-thymine-conjugated-l-phenyl-alanine
#13
Giovanni N Roviello
This article deals with the synthesis in solid phase and characterization of a nucleoamino amide, based on a phenylalaninamide moiety which was N-conjugated to a thymine nucleobase. In analogy to the natural nucleobase-amino acid conjugates, endowed with a wide range of biological properties, the nucleoamino amide interacts with single-stranded nucleic acids as verified in DNA- and RNA-binding assays conducted by CD and UV spectroscopies. These technologies were used to show also that this conjugate binds serum proteins altering significantly their secondary structure, as evidenced by CD and UV using BSA as a model...
May 15, 2018: Amino Acids
https://www.readbyqxmd.com/read/29764765/easy-reuse-of-magnetic-cross-linked-enzyme-aggregates-of-lipase-b-from-candida-antarctica-to-obtain-biodiesel-from-chlorella-vulgaris-lipids
#14
Enrique Angulo Picó, Carmen López, Álvaro Cruz-Izquierdo, Mercedes Munarriz, Francisco Javier Iruretagoyena, Juan Luis Serra, María Jesús Llama
In this work, magnetic cross-linked enzyme aggregates (mCLEAs) of CALB (lipase B from Candida antarctica) were prepared and characterized. Moreover, a method for an easy, sustainable and economic extraction of lipids from nitrogen-starved cells of Chlorella vulgaris var L3 was developed. Then, the extracted lipids (oils and free fatty acids, FFAs) were converted to biodiesel using mCLEAs and chemical acid catalysis. Among several lipid extraction methods, saponification was selected given the amount of wet microalgal biomass it can process per unit of time, its low market value, and because it allows for the use of less toxic solvents...
May 12, 2018: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/29764213/a-novel-non-invasive-strategy-for-low-level-laser-induced-cancer-therapy-by-using-new-ag-zno-and-nd-zno-functionalized-reduced-graphene-oxide-nanocomposites
#15
Saeed Jafarirad, Ebrahim Hammami Torghabe, Seyed Hosseyn Rasta, Roya Salehi
In the present research, an effective drug-free approach was developed to kill MCF7 breast cancer cells using low-level laser therapy (LLLT) combined with reduced graphene oxide (rGO)-based hybrid nanocomposites (NCs). Here, fruit extract of Rosa canina was used for the first time to obtain the rGO/ZnO, Ag-ZnO/rGO and Nd-ZnO/rGO NCs by green synthesis. Physico/photochemical properties of these NCs were evaluated using FTIR, XRD, Raman, XPS, SEM/EDX, UV-Vis, DLS and AFM. The potential of the as-synthesized NCs on ROS generating and antioxidant activity were assessed by DPPH...
May 15, 2018: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29758160/aggregation-and-stabilization-of-colloidal-spheroids-by-oppositely-charged-spherical-nanoparticles
#16
Upendar Siliveru, Ethayaraja Mani, Madivala G Basavaraj
Hetero-aggregation of colloids is an important yet complex physical process involving colloidal/nano particles and is relevant in river delta formation, paper-making, water treatment, blood flocculation and so on. Despite the earlier studies on oppositely charged spherical colloids, hetero-aggregation of colloids of different shapes is less explored. In this regard, we report an experimental study to investigate the colloidal stability of mixture of positively charged spheroidal hematite and negatively charged spherical silica nanoparticles...
May 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29758156/functional-bioinorganic-hybrids-from-enzymes-and-luminescent-silicon-based-nanoparticles
#17
Christopher Jay T Robidillo, Muhammad Amirul Islam, Maryam Aghajamali, Angelique Faramus, Regina Sinelnikov, Xiyu Zhang, Job Boekhoven, Jonathan G C Veinot
This study reports the preparation of functional bioinorganic hybrid materials exhibiting catalytic activity and photoluminescent properties arising from the combination of enzymes and freestanding silicon-based nanoparticles. The hybrid materials reported herein have potential applications in biological sensing/imaging and theranostics as they combine long-lived silicon-based nanoparticle photoluminescence with substrate-specific enzymatic activity. Thermal hydrosilylation of undecenoic acid and alkene-terminated poly(ethylene oxide) with hydride-terminated silicon nanocrystals afforded nanoparticles functionalized with a mixed surface made up of carboxylic acid and poly(ethylene oxide) moieties...
May 14, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29757644/self-assembly-of-a-thermally-responsive-double-hydrophilic-copolymer-in-ethanol-water-mixtures-the-effect-of-preferential-adsorption-and-co-nonsolvency
#18
Victoria Iskrova Michailova, Denitsa B Momekova, Hristiana A Velichkova, Evgeni H Ivanov, Rumiana Kirilova Kotsilkova, Daniela B Karashanova, Elena D Mileva, Ivaylo Vladimirov Dimitrov, Stanislav Miletiev Rangelov
Lower alcohols can induce a combined collapse-swelling de-mixing transition (LCST-type co-nonsolvency) in aqueous solutions of poly(N-isopropylacrylamide) (PNIPAM) by interacting with the polymer's amide groups. This interaction results in an increase of the total surface area of hydrophobic sites and destabilizes the chains. Here, we make use of this phenomenon to drive the counterintuitive self-assembly of a PNIPAM-containing double-hydrophilic graft copolymer in water-ethanol mixtures at T ≪ LCST. Rheological frequency sweeps are used to quantify the distinct solvation states of PNIPAM at various temperatures and ethanol concentrations...
May 14, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/29757640/supramolecular-properties-of-a-monocarboxylic-acid-functionalized-texas-sized-molecular-box
#19
Ren-Tsung Wu, Xiaodong Chi, Takehiro Hirao, Vincent M Lynch, Jonathan L Sessler
A new carboxylic acid-functionalized "Texas-sized" molecular box TxSB-CO2H has been prepared by combining two separate build-ing blocks via an iodide-catalyzed macrocyclization reaction. A single crystal X-ray diffraction analysis revealed a paired "clip-like" dimer in the solid state. Concentration-dependent behavior is seen for samples of TxSB-CO2H as prepared, as inferred from 1H NMR spectroscopic studies carried out in DMSO-d6. However, in the presence of excess acid (1% by weight of deuterated trifluo-racetic acid; TFA-d1), little evidence of aggregation is seen in DMSO-d6 except at the highest accessible concentrations...
May 14, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29755535/optimization-and-characterization-of-aspirin-encapsulated-nano-liposomes
#20
Samira Khodayar, Hassan Bardania, Seyed Abbas Shojaosadati, Fatemeh Bagheri
Resistance to aspirin and its cytotoxicity significantly limits its therapeutic applications. Nano-liposomal encapsulation of aspirin can reduce its cytotoxicity. In this study, aspirin encapsulating nano-liposomes (AS-NL) was prepared and its performance in drug delivery and also cytotoxicity was evaluated. The effects of two independent variables including number of freeze/thawing cycles and concentration of aspirin on encapsulation efficiency was investigated using response surface methodology (RSM). A drug profile release was obtained by AS-NL...
2018: Iranian Journal of Pharmaceutical Research: IJPR
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