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https://www.readbyqxmd.com/read/28741921/bioinspired-composite-matrix-containing-ha-silica-core-shell-nanorods-for-bone-tissue-engineering
#1
Anitha A, Deepthy Menon, Sivanarayanan Tb, Manzoor Koyakutty, Chandini C Mohan, Shantikumar V Nair, Manitha B Nair
Development of multifunctional bioinspired scaffolds that can stimulate vascularization and rege-neration is necessary for application in bone tissue engineering. Herein, we report a composite matrix containing Hydroxyapatite (HA) - silica core shell nanorods with good biocompatibility, osteogenic differentiation, vascularization and bone regeneration potential. The biomaterial consist of crystalline, rod-shaped nanoHA core with uniform amorphous silica sheath (Si-nHA) that retains the characteristic phases of the individual components, confirmed by HR-TEM, XRD, XPS and FTIR...
July 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28741895/a-doubly-boron-doped-perylene-by-n-heterocylic-carbene-borenium-hydroboration-c-h-borylation-dehydrogenation
#2
Jeffrey M Farrell, David Schmidt, Vincenzo Grande, Frank Würthner
Reaction of an N-heterocyclic carbene (NHC)-borenium ion with 9,10-distyrylanthracene forms four B-C bonds through two selective, tandem hydroboration-electrophilic C-H borylations to yield an isolable, crystallographically characterizable polycyclic diborenium ion as its [NTf2]- salt (1). Dehydrogenation of 1 with TEMPO radical followed by acidic workup yields a 3,9-diboraperylene as its corresponding borinic acid (2). This sequence can be performed in one pot to allow the facile, metal-free conversion of an alkene to a small molecule containing a boron-doped graphene substructure...
July 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28741111/label-free-fluorescence-turn-on-aptasensor-for-prostate-specific-antigen-sensing-based-on-aggregation-induced-emission-silica-nanospheres
#3
Rong-Mei Kong, Xiaobin Zhang, Lu Ding, Daoshan Yang, Fengli Qu
Fluorescent light-up probes based on aggregation-induced emission (AIE)-active molecules have recently attracted great research interest due to the intelligent fluorescence activation mechanism and high sensitivity. In this work, an AIE-silica nanosphere (SiO2 NP)-based label-free fluorescent aptasensor for the sensitive "turn-on" detection of prostate-specific antigen (PSA) is reported for the first time. The positively charged amino-functionalized SiO2 NPs were used as efficient nanocapturer to electrostatically adsorb single-stranded PSA aptamer (PA) to form SiO2 NP-PA nanocomposite as well as adsorb negatively charged tetraphenylethylene derivative 3 (TPE3) to form AIE-SiO2 NP nanocomposite...
July 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28740987/rational-synthesis-of-hierarchical-magnetic-mesoporous-silica-microspheres-with-tunable-mesochannels-for-enhanced-enzyme-immobilization
#4
Dapeng Li, Renxing Yi, Jiangwei Tian, Jinhua Li, Boyang Yu, Jin Qi
Hierarchical magnetic mesoporous silica microspheres (MMSMs) with a core-shell structure have been fabricated through an improved water/oil biphase synthesis strategy. We firstly reported that the mesopore size can be readily tuned from 6.1 to 11.4 nm by the synergistic effect of surfactant concentration and an amphiphilic agent, thus holding a bright future in many possible applications.
July 25, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28739273/analysis-of-packing-microstructure-and-wall-effects-in-a-narrow-bore-ultrahigh-pressure-liquid-chromatography-column-using-focused-ion-beam-scanning-electron-microscopy
#5
Arved E Reising, Sabine Schlabach, Vasili Baranau, Daniela Stoeckel, Ulrich Tallarek
Column wall effects are well recognized as major limiting factor in achieving high separation efficiency in HPLC. This is especially important for modern analytical columns packed with small particles, where wall effects dominate the band broadening. Detailed knowledge about the packing microstructure of packed analytical columns has so far not been acquired. Here, we present the first three-dimensional reconstruction protocol for these columns utilizing focused ion-beam scanning electron microscopy (FIB-SEM) on a commercial 2...
July 14, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28738898/silicanin-1-is-a-conserved-diatom-membrane-protein-involved-in-silica-biomineralization
#6
Alexander Kotzsch, Philip Gröger, Damian Pawolski, Paul H H Bomans, Nico A J M Sommerdijk, Michael Schlierf, Nils Kröger
BACKGROUND: Biological mineral formation (biomineralization) proceeds in specialized compartments often bounded by a lipid bilayer membrane. Currently, the role of membranes in biomineralization is hardly understood. RESULTS: Investigating biomineralization of SiO2 (silica) in diatoms we identified Silicanin-1 (Sin1) as a conserved diatom membrane protein present in silica deposition vesicles (SDVs) of Thalassiosira pseudonana. Fluorescence microscopy of GFP-tagged Sin1 enabled, for the first time, to follow the intracellular locations of a biomineralization protein during silica biogenesis in vivo...
July 24, 2017: BMC Biology
https://www.readbyqxmd.com/read/28738680/photothermal-effect-enhanced-cascade-targeting-strategy-for-improved-pancreatic-cancer-therapy-by-gold-nanoshell-mesoporous-silica-nanorod
#7
Ruifang Zhao, Xuexiang Han, Yiye Li, Hai Wang, Tianjiao Ji, Yuliang Zhao, Guangjun Nie
Pancreatic cancer, one of the leading causes of cancer-related mortality, is characterized by desmoplasia and hypovascular cancerous tissue, with a 5-year survival rate of less than 8%. To overcome the severe resistance of pancreatic cancer to conventional therapies, we synthesized gold nanoshell-coated rod-like mesoporous silica (GNRS) nanoparticles which integrated cascade tumor targeting (mediated by photothermal effect and molecular receptor binding) and photothermal treatment-enhanced gemcitabine chemotherapy, under mild near infrared laser irradiation condition...
July 24, 2017: ACS Nano
https://www.readbyqxmd.com/read/28738646/synthesis-characterization-and-application-of-a-novel-multifunctional-stationary-phase-for-hydrophilic-interaction-reversed-phase-mixed-mode-chromatography
#8
Hayriye Aral, K Serdar Çelik, Ramazan Altındağ, Tarık Aral
A novel multifunctional stationary phase based on silica gel was synthesised starting from L- isoleucine and 4-phenylbutylamine and evaluated as a hydrophilic interaction/reversed-phase mixed-mode stationary phase for high-performance liquid chromatography (HPLC). The prepared stationary phase was characterized by elemental analysis, infrared spectroscopy (IR), scanning electron microscopy (SEM), Brunauer, Emmett and Teller (BET) and solid-state (13)C nuclear magnetic resonance (NMR). The mechanisms involved in the chromatographic separation are multi-interaction, including hydrophobic, π-π, hydrogen-bonding, dipole-dipole and ion-dipole interactions...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738643/facile-preparation-of-3-d-floor-like-ordered-mesoporous-carbon-functionalized-graphene-composites-and-its-application-for-selective-enrichment-of-n-glycans-from-human-serum
#9
Quanqing Zhang, Yuanyu Huang, Haofan Sun, Yangyang Gan, Huali Shen, Bin Jia, Pengyuan Yang
Novel 3-D floor-like ordered mesoporous carbon functionalized graphene composites, FLOMC-GO, with high graphitized carbon contents were successfully synthesized using a soft template method. The one-pot sol-gel method was employed to prepare the silica soft template. Then, the sandwich-like composites were further combined together to form a 3-D structure through pre-carbonization and carbonization. During these procedures, the sulphonyl and sulfide bridges were formed by cross-linking processes to connect the phenyl rings...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738607/novel-colorimetric-assay-for-paraquat-detection-on-silica-bead-using-negatively-charged-silver-nanoparticles
#10
Weena Siangproh, Thachkorn Somboonsuk, Orawan Chailapakul, Kriangsak Songsrirote
A simple, rapid, sensitive, and economical method based on colorimetry for the determination of paraquat, a widely used herbicide, was developed. Citrate-coated silver nanoparticles (AgNPs) were synthesized as the colorimetric probe. The mechanism of the assay is related to the aggregation of negatively charged AgNPs as induced by positively-charged paraquat resulting from coulombic attraction which causes the color to change from a deep greenish yellow to pale yellow in accordance with the concentrations of paraquat...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738597/sensitive-detection-of-sulfide-based-on-the-self-assembly-of-fluorescent-silver-nanoclusters-on-the-surface-of-silica-nanospheres
#11
Yehan Yan, Kui Zhang, Huan Yu, Houjuan Zhu, Mingtai Sun, Tasawar Hayat, Ahmed Alsaedi, Suhua Wang
Hydrogen sulfide is a toxic and flammable gaseous pollutant often emitted to air as a by-product of water supply, chemical, petroleum and coal industries. It can be transferred into sulfur dioxide in the air under some meteorologic conditions. Herein, we report a novel ratiometric fluorescence method for hydrogen sulfide based on silver nanoclusters and quantum dots. The silver nanoclusters have been self-assemblied onto the surface of silica spheres, which are embedded with red fluorescent quantum dots, to form a dual-emissive nanohybrid...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738585/ordered-mesoporous-silica-film-as-a-novel-fiber-coating-for-solid-phase-microextraction
#12
Hui Jiang, Jiansheng Li, Xingru Hu, Jinyou Shen, Xiuyun Sun, Weiqing Han, Lianjun Wang
Ordered mesoporous silica (OMS) film supported on anodized titanium wire was fabricated as a new solid phase microextraction (SPME) fiber for the extraction of chlorophenols (CPs) from aqueous media followed by the determination with gas chromatography flame ionization detection (GC-FID). The supported OMS film was prepared via a solvent evaporation-induced self-assembly approach (EISA) combined with dip-coating technology. Commonly used fragile fused silica fiber was replaced by anodized titanium wire. The coating materials were characterized by N2 adsorption-desorption, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and thermogravimetric (TG) analysis...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738554/amperometric-detector-for-gas-chromatography-based-on-a-silica-sol-gel-solid-electrolyte
#13
William H Steinecker, Krzysztof Miecznikowski, Pawel J Kulesza, Zechariah D Sandlin, James A Cox
An electrochemical cell comprising a silica sol-gel solid electrolyte, a working electrode that protrudes into a gas phase, and reference and counter electrodes that contact the solid electrolyte comprises an amperometric detector for gas chromatography. Under potentiostatic conditions, a current related to the concentration of an analyte in the gas phase is produced by its oxidation at the three-phase boundary among the sol-gel, working electrode, and the gas phase. The sol-gel is processed to contain an electrolyte that also serves as a humidistat to maintain a constant water activity even in the presence the gas chromatographic mobile phase...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738551/biomass-saccharification-is-largely-enhanced-by-altering-wall-polymer-features-and-reducing-silicon-accumulation-in-rice-cultivars-harvested-from-nitrogen-fertilizer-supply
#14
Zahoor, Dan Sun, Ying Li, Jing Wang, Yuanyuan Tu, Yanting Wang, Zhen Hu, Shiguang Zhou, Lingqiang Wang, Guosheng Xie, Jianliang Huang, Aftab Alam, Liangcai Peng
In this study, two rice cultivars were collected from experimental fields with seven nitrogen fertilizer treatments. All biomass samples contained significantly increased cellulose contents and reduced silica levels, with variable amounts of hemicellulose and lignin from different nitrogen treatments. Under chemical (NaOH, CaO, H2SO4) and physical (hot water) pretreatments, biomass samples exhibited much enhanced hexoses yields from enzymatic hydrolysis, with high bioethanol production from yeast fermentation...
July 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28738282/fouling-behavior-of-silica-nanoparticle-surfactant-mixtures-during-constant-flux-dead-end-ultrafiltration
#15
Krzysztof W Trzaskus, Sooi Li Lee, Wiebe M de Vos, Antoine Kemperman, Kitty Nijmeijer
The increasing use of engineered nanoparticles in customer products results in their accumulation in water sources. In this experimental study, we investigated the role of surfactant type (cationic, anionic and non-ionic) and concentration on fouling development, nanoparticle rejection and fouling irreversibility during dead-end ultrafiltration of model silica nanoparticles. Our work demonstrates that the type of surfactant influences the nanoparticle stability, which in turn is responsible for differences in fouling behavior of the nanoparticles...
July 15, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28737925/lipid-bilayer-gated-mesoporous-silica-nanocarriers-for-tumor-targeted-delivery-of-zoledronic-acid-in-vivo
#16
Diti Desai, Jixi Zhang, Jouko Sandholm, Jaakko Lehtimäki, Tove Grönroos, Johanna Tuomela, Jessica M Rosenholm
Zoledronic acid (ZOL) is a nitrogen-containing bisphosphonate used for the treatment of bone diseases and calcium metabolism. Anticancer activity of ZOL has been established, but its extraskeletal effects are limited due to its rapid uptake and accumulation to bone hydroxyapatite. In this work, we report on the development of tethered lipid bilayer-gated mesoporous silica nanocarriers (MSNs) for the incorporation, retention and intracellular delivery of ZOL. The in vitro anticancer activity of ZOL-loaded nanocarriers was evaluated by cell viability assay and live-cell imaging...
July 24, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28737794/heterogeneous-enantioselective-synthesis-of-chromans-via-the-oxa-michael-michael-cascade-reaction-synergically-catalyzed-by-grafted-chiral-bases-and-inherent-hydroxyls-on-mesoporous-silica-surface
#17
Shanshan Wang, Jing He, Zhe An
A heterogeneous enantioselective oxa-Michael-Michael reaction for the synthesis of chromans has been developed on a heterogeneous acid-base synergic catalyst with inherent silica as acidic sites and immobilized chiral amines as basic sites. Final products were afforded in selectivity of up to 98% and ee of 97% from 2-nitrovinyl phenol and 3-methyl-2-butenal. The heterogeneous synergistic catalytic mechanism has also been studied.
July 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28737785/how-to-obtain-pt-iv-complexes-suitable-for-conjugation-to-nanovectors-from-the-oxidation-of-ptcl-terpyridine
#18
E Gabano, E Perin, C Fielden, J A Platts, A Gallina, B Rangone, M Ravera
Oxidation of [Pt((II))Cl(terpy)](+) (terpy = 2,2':6',2''-terpyridine) has been attempted with several oxidizing agents and under different experimental conditions in order to obtain a Pt(iv) complex suitable for the conjugation to nanovectors to be used in drug delivery targeting for anticancer therapy. The best compromise in terms of yield and purity of the final complex was obtained by microwave-assisted reaction at 70 °C in 50% aqueous H2O2 for 2 h. Under these conditions the quantitative formation of [Pt((IV))Cl(OH)2(terpy)](+) was observed...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28737672/mesoporous-silica-nanoparticles-as-drug-delivery-vehicles-in-cancer
#19
REVIEW
Anna Watermann, Juergen Brieger
Even though cancer treatment has improved over the recent decades, still more specific and effective treatment concepts are mandatory. Surgical removal is not always possible, metastases are challenging and chemo- and radiotherapy can not only have severe side-effects but also resistances may occur. To cope with these challenges more efficient therapies with fewer side-effects are required. One promising approach is the use of drug delivery vehicles. Here, mesoporous silica nanoparticles (MSN) are discussed as biodegradable drug carrier to improve efficacy and reduce side-effects...
July 22, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28737393/continuous-o2-evolving-mnfe2o4-nanoparticle-anchored-mesoporous-silica-nanoparticles-for-efficient-photodynamic-therapy-in-hypoxic-cancer
#20
Jonghoon Kim, Hye Rim Cho, Hyejin Jeon, Dokyoon Kim, Changyeong Song, Nohyun Lee, Seung Hong Choi, Taeghwan Hyeon
Cancer hypoxia, which involves a complex microenvironment ex-hibiting low O2 concentrations and nutrient deficiency, is known to prevent effective cancer treatment. In particular, the therapeutic effects of photodynamic therapy (PDT) are severely limited by cancer hypoxia, because the PDT process is strongly dependent on O2 concentration. Herein, we design and synthesize biocompatible manganese ferrite nanoparticle-anchored mesoporous silica nano-particles (MFMSNs) to overcome hypoxia, and consequently en-hancing the therapeutic efficiency of PDT...
July 24, 2017: Journal of the American Chemical Society
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