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https://www.readbyqxmd.com/read/28538693/preparation-characterization-and-antioxidant-activity-evaluation-of-liposomes-containing-water-soluble-hydroxytyrosol-from-olive
#1
Jiao-Jiao Yuan, Frank G F Qin, Jun-Ling Tu, Bing Li
Due to the multiple hydroxyl groups in its structure, hydroxytyrosol (HT) is very sensitive to air and light and has very strong instability and hydrophilicity that affect its biological activity. This study attempted to prepare liposomes containing water-soluble HT to improve the bioavailability and biocompatibility of the target drug. The preparation process factors (temperature, mass ratio of phospholipid (PL) and cholesterol (CH), Tween-80 volume, HT mass) were studied and response surface methodology (RSM) was applied to optimize the conditions...
May 24, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28538680/diazonium-salt-based-surface-enhanced-raman-spectroscopy-nanosensor-detection-and-quantitation-of-aromatic-hydrocarbons-in-water-samples
#2
Inga Tijunelyte, Stéphanie Betelu, Jonathan Moreau, Ioannis Ignatiadis, Catherine Berho, Nathalie Lidgi-Guigui, Erwann Guénin, Catalina David, Sébastien Vergnole, Emmanuel Rinnert, Marc Lamy de la Chapelle
Here, we present a surface-enhanced Raman spectroscopy (SERS) nanosensor for environmental pollutants detection. This study was conducted on three polycyclic aromatic hydrocarbons (PAHs): benzo[a]pyrene (BaP), fluoranthene (FL), and naphthalene (NAP). SERS substrates were chemically functionalized using 4-dodecyl benzenediazonium-tetrafluoroborate and SERS analyses were conducted to detect the pollutants alone and in mixtures. Compounds were first measured in water-methanol (9:1 volume ratio) samples. Investigation on solutions containing concentrations ranging from 10(-6) g L(-1) to 10(-3) g L(-1) provided data to plot calibration curves and to determine the performance of the sensor...
May 24, 2017: Sensors
https://www.readbyqxmd.com/read/28538196/self-assembly-of-gd-3-sds-hepes-complex-and-curcumin-entrapment-for-enhanced-stability-fluorescence-image-in-cellular-system
#3
Chonticha Sahub, Gamolwan Tumcharern, Prae Chirawatkul, Vithaya Ruangpornvisuti, Sanong Ekgasit, Supasorn Wanichweacharungruang, Thawatchai Tuntulani, Tanapat Palaga, Boosayarat Tomapatanaget
At present, strategies to disperse hydrophobic molecules in water without altering their chemical structures include conventional surfactant-based micellar and vesicular systems, encapsulation into water dispersible polymeric nanoparticles, and loading onto the surface of various metal nanoparticles. Here, we report a simple and low cost platform to incorporate hydrophobic molecules into a stable water dispersible nanostructure that can significantly increase the stability of the encapsulated materials. The platform is based on the incorporation of hydrophobic molecules into the self-assembled complex of gadolinium ion (Gd(3+)), sodium dodecyl sulfate (SDS), and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) called GdSH...
May 13, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28538189/evaluation-of-methods-to-sample-fecal-indicator-bacteria-in-foreshore-sand-and-pore-water-at-freshwater-beaches
#4
Laura J Vogel, Thomas A Edge, Denis M O'Carroll, Helena M Solo-Gabriele, Caitlin S E Kushnir, Clare E Robinson
Fecal indicator bacteria (FIB) are known to accumulate in foreshore beach sand and pore water (referred to as foreshore reservoir) where they act as a non-point source for contaminating adjacent surface waters. While guidelines exist for sampling surface waters at recreational beaches, there is no widely-accepted method to collect sand/sediment or pore water samples for FIB enumeration. The effect of different sampling strategies in quantifying the abundance of FIB in the foreshore reservoir is unclear. Sampling was conducted at six freshwater beaches with different sand types to evaluate sampling methods for characterizing the abundance of E...
May 9, 2017: Water Research
https://www.readbyqxmd.com/read/28538154/effect-of-ca-2-to-sphingomyelin-investigated-by-sum-frequency-generation-vibrational-spectroscopy
#5
Rong-Juan Feng, Lu Lin, Yi-Yi Li, Ming-Hua Liu, Yuan Guo, Zhen Zhang
The interactions between Ca(2+) ions and sphingomyelin play crucial roles in a wide range of cellular activities. However, little is known about the molecular details of the interactions at interfaces. In this work, we investigated the interactions between Ca(2+) ions and egg sphingomyelin (ESM) Langmuir monolayers at the air/water interface by subwavenumber high-resolution broadband sum frequency generation vibrational spectroscopy (HR-BB-SFG-VS). We show that Ca(2+) ions can induce ordering of the acyl chains in the ESM monolayer...
May 23, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28537751/using-neutron-reflectometry-to-characterize-antimicrobial-protein-surface-coatings
#6
Peter W Akers, Andrew J Dingley, Simon Swift, Andrew R J Nelson, Julie Martin, Duncan James McGillivray
Understanding the interaction of adsorbed or covalently immobilized proteins with solid substrates at the molecular level guides the successful design of functionalized surfaces used in biomedical applications. In this report, neutron reflectometry (NR) was used to characterize the structure of surface-attached antimicrobial protein films, with antimicrobial activity assessed using an adaption of the Japanese Industrial Standard Test JIS Z 2801. NR allowed parameters influencing bioactivity to be measured at nanometer resolution and for conclusions about structural characteristics relating to bioactivity to be drawn...
May 24, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28537745/deciphering-cryptic-binding-sites-on-proteins-by-mixed-solvent-molecular-dynamics
#7
S Roy Kimura, Haipeng Hu, Anatoly M Ruvinsky, Woody B Sherman, Angelo D Favia
In recent years, molecular dynamics simulations of proteins in explicit mixed-solvents have been applied to various problems in protein biophysics and drug discovery, including protein folding, protein surface characterization, fragment screening, allostery, and druggability assessment. In this study, we perform a systematic study on how mixtures of organic solvent probes in water can reveal cryptic ligand binding pockets that are not evident in crystal structures of apo proteins. We examine a diverse set of eight PDB proteins that show pocket opening induced by ligand binding and investigate whether solvent MD simulations on the apo structures can induce the binding site observed in the holo structures...
May 24, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28537736/probing-the-cleaning-of-polymeric-coatings-by-nanostructured-fluids-a-qcm-d-study
#8
Martina Raudino, Nicoletta Giamblanco, Costanza Montis, Debora Berti, Giovanni Marletta, Piero Baglioni
Complex fluids composed of water, an organic solvent and a surfactant have been recently employed as cleaning systems to remove hydrophobic materials, such as polymeric coatings, from solid surfaces. The simultaneous presence of surfactants and an organic solvent with good affinity for the polymer was proven necessary for the polymer's removal, but the comprehension of the cleaning mechanism is poorly understood. In this article we investigated the mechanism of removal, highlighting the specific role of each component in the interaction with the polymer film...
May 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28535601/risk-of-post-fire-metal-mobilization-into-surface-water-resources-a-review
#9
REVIEW
Joji Abraham, Kim Dowling, Singarayer Florentine
One of the significant economic benefits to communities around the world of having pristine forest catchments is the supply of substantial quantities of high quality potable water. This supports a saving of around US$ 4.1 trillion per year globally by limiting the cost of expensive drinking water treatments and provision of unnecessary infrastructure. Even low levels of contaminants specifically organics and metals in catchments when in a mobile state can reduce these economic benefits by seriously affecting the water quality...
May 19, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28535540/development-of-a-synthetic-substrate-for-the-in-vitro-performance-testing-of-sunscreens
#10
Myriam Sohn, Camille Malburet, Laure Baptiste, Yvonne Prigl
PURPOSE: Polymethylmethacrylate (PMMA) plates generally used for the in vitro testing of sunscreens have failed to yield a satisfactory correlation between the sun protection factor (SPF) in vitro and that in vivo. In the present study, various polymers were investigated as alternative substrates to PMMA plates. PROCEDURES: In total, 14 polymers were tested in terms of ultraviolet (UV) transparency by transmission spectroscopy, and surface properties by contact angle measurement...
May 24, 2017: Skin Pharmacology and Physiology
https://www.readbyqxmd.com/read/28535481/graphene-oxide-enzyme-hybrid-nanoflowers-for-efficient-water-soluble-dye-removal
#11
Hui Li, Jingwei Hou, Linlin Duan, Chao Ji, Yatao Zhang, Vicki Chen
High efficient enzyme immobilization on carbon based conductive supports could provide wide applications in energy and environmental science. Here, we synthesized a 3D flower-like structured self-assembly hybrid nanocomposite with copper phosphate, laccase, graphite oxide (GO) and carbon nanotubes (CNTs) via a facile one-pot strategy under mild conditions. The prepared nanocomposite exhibited very high enzyme loading and improved laccase activity. During the formation of the nanocomposite, the copper phosphate-laccase petals were interwined by CNTs, and GO nanosheets were further coated on the petal surface...
May 11, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535444/passive-detection-of-pb-in-water-using-rock-phosphate-agarose-beads
#12
Harry M Edenborn, Bret H Howard, James I Sams, Dorothy J Vesper, Sherie L Edenborn
In this study, passive detectors for Pb were prepared by immobilizing powdered rock phosphate in agarose beads. Rock phosphate has been used to treat Pb-contaminated waters and soil by fixing the metal as an insoluble pyromorphite mineral. Under lab conditions, Pb was rapidly adsorbed from aqueous solution by the beads over time, consistent with the acidic dissolution of rock phosphate, the precipitation of pyromorphite within the pore space of the agarose gel matrix, and surface exchange reactions. Net accumulation of Pb occurred when beads were exposed to simulated periodic releases of Pb over time...
April 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535433/a-highly-selective-surface-coating-for-enhanced-membrane-rejection-of-endocrine-disrupting-compounds-mechanistic-insights-and-implications
#13
Hao Guo, Yu Deng, Zhikan Yao, Zhe Yang, Jianqiang Wang, Chuner Lin, Tong Zhang, Baoku Zhu, Chuyang Y Tang
We designed a highly selective surface coating to achieve enhanced rejection of endocrine disrupting compounds (EDCs) by nanofiltration membranes. A commercial NF90 membrane was first coated with polydopamine (PDA) followed by in situ immobilization of silver nanoparticles (AgNPs). This PDA/AgNPs coating greatly improved EDC rejection at the expense of slight water permeability loss (4-10%). This improvement in rejection can be attributed to a combination of enhanced size exclusion and suppressed hydrophobic interaction...
May 18, 2017: Water Research
https://www.readbyqxmd.com/read/28535335/non-zero-ideal-gas-contribution-to-the-surface-tension-of-water
#14
Marcello Sega, Balázs Fábián, Pal Jedlovszky
Surface tension, the tendency of fluid interfaces to behave elastically and minimize their surface, is routinely calculated as the difference between the lateral and normal components of the pressure or, invoking isotropy in momentum space, of the virial tensor. Here we show that the anisotropy of the kinetic energy tensor close to a liquid/vapour interface can be responsible for a large part of its surface tension (about 15 % for water, independently on temperature).
May 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28535066/marangoni-flow-induced-evaporation-enhancement-on-binary-sessile-drops
#15
Pin Chen, Souad Harmand, Safouene Ouenzerfi, Jesse Schiffler
The evaporation processes of pure water, pure 1-butanol, and 5% 1-butanol aqueous solution drops on heated hydrophobic substrates are investigated to determine the effect of temperature on the drop evaporation behavior. The evolution of the parameters (contact angle, diameter, and volume) during evaporation measured using a drop shape analyzer and the infrared thermal mapping of the drop surface recorded by an infrared camera were used in investigating the evaporation process. The pure 1-butanol drop does not show any thermal instability at different substrate temperatures, while the convection cells created by the thermal Marangoni effect appear on the surface of the pure water drop from 50°C...
May 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28535047/electronic-and-morphological-dual-modulation-of-cobalt-carbonate-hydroxides-by-mn-doping-towards-highly-efficient-and-stable-bifunctional-electrocatalysts-for-overall-water-splitting
#16
Tang Tang, Wen-Jie Jiang, Shuai Niu, Ning Liu, Hao Luo, Yu-Yun Chen, Shi-Feng Jin, Feng Gao, Li-Jun Wan, Jin-Song Hu
Developing bifunctional non-noble electrocatalysts for efficient and durable oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is highly desirable and challenging for overall water splitting. Herein, Co-Mn carbonate hydroxide (CoMnCH) nanosheet arrays with controllable morphology and composition were developed on nickel foam (NF) as such bifunctional electrocatalysts. It was discovered that Mn doping in CoCH can simultaneously modulate the nanosheet morphology to significantly increase the electrochemical active surface area for exposing more accessible active sites and tune the electronic structure of Co center to effectively boost its intrinsic activity...
May 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28535038/fabrication-of-a-biodegradable-implant-with-tunable-characteristics-for-bone-implant-applications
#17
Iman Manavitehrani, Ali Fathi, Yiwei Wang, Peter K Maitz, Farid Mirmohseni, Tegan L Cheng, Lauren Peacock, David G Little, Aaron Schindeler, Fariba Dehghani
Biodegradable polymers are appealing material for the manufacturing of surgical implants as such implants break down in vivo, negating the need for a subsequent operation for removal. Many biocompatible polymers produce acidic breakdown products that can lead to localized inflammation and osteolysis. This study assesses the feasibility of fabricating implants out of poly(propylene carbonate) (PPC)-starch that degrades into CO2 and water. The basic compression modulus of PPC-starch (1:1 w/w) is 34 MPa; however, the addition of glycerol (1% w/w) and water as plasticizers doubles this value and enhances the surface wettability...
May 23, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28535031/tunichrome-inspired-gold-enrichment-dispersion-matrix-and-its-application-in-water-treatment-a-proof-of-concept-investigation
#18
Amarendra Dhar Dwivedi, Rega Permana, Jitendra Pal Singh, Hakwon Yoon, Keun Hwa Chae, Yoon-Seok Chang, Dong Soo Hwang
Tunicate, a filter-feeder in seawater, is able to accumulate high amount of metals using intracellular polymer matrices. The woven pyrogallol structures of tunichrome, a small peptide contained in tunicate's blood cells, is believed to be responsible for selective metal sequestration in tunicates from seawater. However, the intriguing tunichrome matrix is difficult to harvest from the tunicate nor to synthesize massively due to the extreme oxidation sensitivity of the pyrogallol moiety which limits the study scope...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534910/synergy-of-the-mechanical-antifouling-and-permeation-properties-of-a-carbon-nanotube-nanohybrid-membrane-for-efficient-oil-water-separation
#19
Yanan Liu, Yanlei Su, Jialin Cao, Jingyuan Guan, Linyan Xu, Rannan Zhang, Mingrui He, Qi Zhang, Lin Fan, Zhongyi Jiang
For water treatment applications, fabricating a high permeation flux membrane with super-strong mechanical strength and excellent long-term antifouling properties remains a great challenge. In this study, robust, antifouling carbon nanotube (CNT) nanohybrid membranes have been fabricated for oil/water separation. Polyethyleneimine (PEI) with abundant amino groups and a hyperbranched structure is utilized to construct a nanocoating on a CNT surface to enhance their hydrophilicity through multiple interactions between PEI and CNTs...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28534627/highly-stable-and-regenerative-metal-organic-framework-designed-by-multi-walled-divider-installation-strategy-for-detection-of-co-%C3%AE-%C3%AE-ions-and-organic-aromatics-in-water
#20
Kai Xing, Ruiqing Fan, Jiaqi Wang, Siqi Zhang, Kai Feng, Xi Du, Yang Song, Ping Wang, Yulin Yang
MOF-based sensors capable of effectively and stably detecting toxic species in water have attracted huge attention in terms of improving environmental monitoring levels and water quality. Combining the flexibility of structure and modifying of pore surface, a multi-walled divider installation (MWDI) strategy is proposed and used for property enhancement. We herein report three metal-organic frameworks (MOFs) 1-3 based on a C3 symmetry organic phosphonic ligand with topology increased from 3,6-connected to 3,8-connected...
May 23, 2017: ACS Applied Materials & Interfaces
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