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https://www.readbyqxmd.com/read/29457461/correction-to-single-molecule-studies-of-acidity-distributions-in-mesoporous-aluminosilicate-thin-films
#1
Xiaojiao Sun, Jingyi Xie, Jiayi Xu, Daniel A Higgins, Keith L Hohn
No abstract text is available yet for this article.
February 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29457453/exquisite-enzyme-fenton-biomimetic-catalysts-for-hydroxyl-radical-production-by-mimicking-an-enzyme-cascade
#2
Qi Zhang, Shuo Chen, Hua Wang, Hongtao Yu
Hydrogen peroxide (H2O2) is a key reactant in Fenton process. As a byproduct of enzymatic reaction, H2O2 can be obtained via the catalytical oxidation of glucose using glucose oxidase in the presence of O2. Another oxidation product (gluconic acid) can suitably adjust the microenvironmental pH contributing to the Fe3+/Fe2+ cycle in the Fenton reaction. Enzymes are extremely efficient at catalyzing a variety of reactions with high catalytic activity, substrate specificity and yields in living organisms. Inspired by the multiple functions of natural multienzyme systems, an exquisite nanozyme-modified α-FeOOH/porous carbon (PC) biomimetic catalyst constructed by in situ growth of glucose oxidase-mimicking Au nanoparticles and crystallization of adsorbed ferric ions within carboxyl into hierarchically PC is developed as an efficient enzyme-Fenton catalyst...
February 19, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29457451/boosted-electrochemical-immunosensing-gm-crops-markers-using-nanobody-and-mesoporous-carbon
#3
Mingming Zhang, Guanghui Li, Qing Zhou, Deng Pan, Min Zhu, Runyu Xiao, Yuanjian Zhang, Guoqiu Wu, Yakun Wan, Yanfei Shen
The problems of environmental security and the potential risks of human health caused by transgenic crops have aroused numerous attention. Recent studies reveal 5-enolpyruvylshikimate-3-phosphate synthase (EPSPS) from Agrobacterium sp. strain CP4 protein (CP4-EPSPS), which shows very high resistance to herbicide glyphosate, is a typical biomarker of genetically modified (GM) crops. For this reason, it is highly anticipated to devise a sensitive and convenient strategy to detect CP4-EPSPS protein in crops. Herein, we reported a simple electrochemical immunosensor by coupling nanobody, ordered mesoporous carbon (OMC), and thionine (Th)...
February 19, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29456044/mesoporous-silica-nanoparticles-functionalized-with-hyaluronic-acid-effect-of-the-biopolymer-chain-length-on-cell-internalization
#4
Valentina Nairi, Silvia Magnolia, Marco Piludu, Mariella Nieddu, Cristian Antonio Caria, Valeria Sogos, Maria Vallet-Regì, Maura Monduzzi, Andrea Salis
Mesoporous silica nanoparticles (MSNs) were functionalized with amino groups (MSN-NH2 ) and then with hyaluronic acid, a biocompatible biopolymer which can be recognized by CD44 receptors in tumor cells, to obtain a targeting drug delivery system. To this purpose, three hyaluronic acid samples differing for the molecular weight, namely HAS (8-15 kDa), HAM (30-50 kDa) and HAL (90-130 kDa), were used. The MSN-HAS , MSN-HAM , and MSN-HAL materials were characterized through zeta potential and dynamic light scattering measurements at pH = 7...
February 12, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29455037/physical-chemical-properties-of-dental-composites-and-adhesives-containing-silane-modified-sba-15
#5
Gedalias Custódio Martim, Vicente Lira Kupfer, Murilo Pereira Moisés, Andressa Dos Santos, Paulo Henrique Maciel Buzzetti, Andrelson Wellington Rinaldi, Adley Forti Rubira, Emerson Marcelo Girotto
The aim of this study was to synthesize and characterize mesoporous materials SBA-15 and SBA-15 modified with 3-(methacryloxy)-propyl-trimethoxysilane (MPS) to be used as inorganic filler in restorative dental composites and adhesives, and evaluate the main physical-chemical properties of the resulting material. The SBA-15 and SBA-15/MPS were characterized by FTIR, BET and X-Ray and combined with TEGDMA, bis-GMA and commercial spherical silica to produce dental composites. Afterwards, the mesoporous materials were combined with TEGDMA, bis-GMA and HEMA to make adhesives...
February 9, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29454159/an-aligned-porous-electrospun-fibrous-membrane-with-controlled-drug-delivery-an-efficient-strategy-to-accelerate-diabetic-wound-healing-with-improved-angiogenesis
#6
Xiaozhi Ren, Yiming Han, Jie Wang, Yuqi Jiang, Zhengfang Yi, He Xu, Qinfei Ke
A chronic wound in diabetic patients is usually characterized by poor angiogenesis and delayed wound closure. The exploration of efficient strategy to significantly improve angiogenesis in the diabetic wound bed and thereby accelerate wound healing is still a significant challenge. Herein, we reported a kind of aligned porous poly (L-lactic acid) (PLLA) electrospun fibrous membranes containing dimethyloxalylglycine (DMOG)-loaded mesoporous silica nanoparticles (DS) for diabetic wound healing. The PLLA electrospun fibers aligned in a single direction and there were ellipse-shaped nano-pores in situ generated onto the surface of fibers, while the DS were well distributed in the fibers and the DMOG as well as Si ion could be controlled released from the nanopores on the fibers...
February 14, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29453086/pegylated-polyaminoacid-capped-mesoporous-silica-nanoparticles-for-mitochondria-targeted-delivery-of-celastrol-in-solid-tumors
#7
Ju Yeon Choi, Biki Gupta, Thiruganesh Ramasamy, Jee-Heon Jeong, Sung Giu Jin, Han-Gon Choi, Chul Soon Yong, Jong Oh Kim
The major goal of cancer chemotherapy is to maximize the therapeutic efficacy of anticancer drugs, while minimizing their associated side effects. Celastrol (CST), which is extracted from the traditional Chinese medicinal plant Tripterygium wilfordii, has been reported to exhibit significant anticancer effects in various in vitro and in vivo cancer models. Nanoparticulate drug delivery systems could be employed to preserve and enhance the pharmacological effects of CST in cancer cells. Among these, mesoporous silica nanoparticles (MSNs) are one of the most promising drug delivery systems...
February 11, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29453050/enhancement-in-the-aromatic-yield-from-the-catalytic-fast-pyrolysis-of-rice-straw-over-hexadecyl-trimethyl-ammonium-bromide-modified-hierarchical-hzsm-5
#8
Zihao Zhang, Hao Cheng, Hao Chen, Kequan Chen, Xiuyang Lu, Pingkai Ouyang, Jie Fu
Modified H-type ZSM-5 (HZSM-5) catalysts were prepared using hexadecyl trimethyl ammonium bromide (CTAB) as mesopore templates to enhance the activity for the catalytic fast pyrolysis of rice straw for aromatics compounds. A certain quantity of CTAB added into the HZSM-5 (HZ) forming hierarchical structure exhibited an improvement in the yield of the aromatics and a decrease in the yield of coke in comparison with that of bare HZ. In contrast, excessive CTAB addition resulted in a decrease in aromatic yield and an increase in coke yield...
February 8, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29452948/photo-tearable-tape-close-wrapped-upconversion-nanocapsules-for-near-infrared-modulated-efficient-sirna-delivery-and-therapy
#9
Yue Zhang, Kewei Ren, Xiaobo Zhang, Zhicong Chao, Yuqin Yang, Deju Ye, Zhihui Dai, Ying Liu, Huangxian Ju
RNA interference (RNAi) has become an appealing therapeutic approach for cancer and other diseases. One key challenge is the effective protection of these small fragile biomolecules against complicated physiological environments as well as efficient on-demand release. Here we design a photo-tearable polymer tape close-wrapped nanocapsule for efficient NIR modulated siRNA delivery. The photo-tearable nanocapsules comprise core-shell upconversion nanoparticles (UCNPs) coated with mesoporous silica layer for loading of photosensitizer hypocrellin A (HA) and small interfering RNA (siRNA) against polo-like kinase 1 (PLK1), and covalently bound thin membranes of polyethylene glycol (PEG) via a synthesized photocleavable linker (PhL)...
February 9, 2018: Biomaterials
https://www.readbyqxmd.com/read/29452946/time-responsive-osteogenic-niche-of-stem-cells-a-sequentially-triggered-dual-peptide-loaded-alginate-hybrid-system-for-promoting-cell-activity-and-osteo-differentiation
#10
Zuyuan Luo, Siqi Zhang, Jijia Pan, Rui Shi, Hao Liu, Yalin Lyu, Xiao Han, Yan Li, Yue Yang, Zhixiu Xu, Yi Sui, En Luo, Yuanyuan Zhang, Shicheng Wei
The efficacy of stem cell-based bone tissue engineering has been hampered by cell death and limited fate control. A smart cell culture system with the capability of sequentially delivering multiple factors in specific growth stages, like the mechanism of the natural extracellular matrix modulating tissue formation, is attractive for enhancing cell activity and controlling cell fate. Here, a bone forming peptide-1 (BFP-1)-laden mesoporous silica nanoparticles (pep@MSNs) incorporated adhesion peptide, containing the arginine-glycine-aspartic acid (RGD) domain, modified alginate hydrogel (RA) system (pep@MSNs-RA) was developed to promote the activity and stimulate osteo-differentiation of human mesenchymal stem cells (hMSCs) in sequence...
February 10, 2018: Biomaterials
https://www.readbyqxmd.com/read/29452944/iron-engineered-mesoporous-silica-nanocatalyst-with-biodegradable-and-catalytic-framework-for-tumor-specific-therapy
#11
Liying Wang, Minfeng Huo, Yu Chen, Jianlin Shi
Inorganic mesoporous silica-based nanovehicles are highly promising for drug delivery but still suffer from the disadvantages of lacking functionality and poor biodegradability on account of the inert silica framework. Moreover, conventional cancer therapeutics typically employ toxic anticancer drugs or invasive external irradiations, which will inevitably give rise to severe adverse effects and diminished therapeutic outcome. In this work, we report on the iron engineered framework of mesoporous silica nanoparticles (MSNs) to fabricate a nanocatalyst with biodegradable and catalytic framework via a "dissolution-regeneration" strategy (designated as rFeO x -HMSN)...
February 9, 2018: Biomaterials
https://www.readbyqxmd.com/read/29451952/one-step-synthesis-of-hybrid-core-shell-metal-organic-frameworks
#12
Xinyu Yang, Shuai Yuan, Lanfang Zou, Hannah Drake, Yingmu Zhang, Junsheng Qin, Ali Alsalme, Hongcai Zhou
Epitaxial growth of MOF-on-MOF composite is an evolving research topic. In current methods, the core-shell MOFs are synthesized via a stepwise strategy which involves growing the shell-MOFs on top of the preformed core-MOFs with matched lattice parameters. However, the inconvenient stepwise synthesis and the strict lattice-matching requirement have limited the development of core-shell MOFs. Herein, we demonstrate that hybrid core-shell MOFs with mismatching lattices can be synthesized under the guidance of nucleation kinetics...
February 16, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29451421/bionanocomposite-scaffolds-based-on-chitosan-gelatin-and-nanodimensional-bioactive-glass-particles-in-vitro-properties-and-in-vivo-bone-regeneration
#13
Cristian Covarrubias, Monserrat Cádiz, Miguel Maureira, Isabel Celhay, Felipe Cuadra, Alfredo von Marttens
Bone repair bionanocomposite scaffolds were produced by incorporating dense bioactive glass nanoparticles or mesoporous bioactive glass nanospheres into a chitosan-gelatin polymer blend. The in vitro bioactivity of the scaffolds was assessed in simulated body fluid, and cell viability and osteogenic differentiation assays were performed with dental pulp stem cells. Bone regeneration properties of the scaffold materials were in vivo assessed by using a critical-sized femoral defect model in rat. The scaffold nanocomposites showed excellent cytocompatibility and ability to accelerate the crystallization of bone-like apatite in vitro...
January 1, 2018: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29450652/enhanced-tumor-diagnostic-and-therapeutic-effect-of-mesoporous-silica-nanoparticle-mediated-pre-targeted-strategy
#14
Gaochao Lv, Ke Li, Ling Qiu, Ying Peng, Xueyu Zhao, Xi Li, Qingzhu Liu, Shanshan Wang, Jianguo Lin
PURPOSE: Improving the targeting efficiency of imaging agents or anticancer drugs has become essential in the current primary mission to enhance the diagnostic or therapeutic effects. To improve the tumor diagnosis and therapy effect, a promising drug-delivery and targeting strategy was established based on the bioorthogonal chemistry. METHOD: The delivery system was composed of the pre-targeting carrier Biotin-MSNs-DBCO nanoparticles and the azido cargoes. The fluorescence probe 1-(3-azidopropyl) fluorescein (FITC-N 3 ) and ruthenium N-heterocyclic carbene complex N 3 -S-S-NHC-Ru were synthesized and served as the tumor imaging and therapy probes, respectively...
February 14, 2018: Pharmaceutical Research
https://www.readbyqxmd.com/read/29449583/mesoporous-silica-nanocarriers-encapsulated-antimalarials-with-high-therapeutic-performance
#15
Saliu Alao Amolegbe, Yui Hirano, Joseph Oluwatope Adebayo, Olusegun George Ademowo, Elizabeth Abidemi Balogun, Joshua Ayoola Obaleye, Antoniana Ursine Krettli, Chengzhong Yu, Shinya Hayami
The use of nanocarriers in drug delivery is a breakeven research and has received a clarion call in biomedicine globally. Herein, two newly nano-biomaterials: MCM-41 encapsulated quinine (MCM-41 ⊃ QN) (1) and 3-phenylpropyl silane functionalized MCM-41 loaded QN (pMCM-41 ⊃ QN) (2) were synthesized and well characterized. 1 and 2 along with our two already reported nano-antimalarial drugs (MCM-41 ⊃ ATS) (3) and 3-aminopropyl silane functionalized MCM-41 contained ATS (aMCM-41 ⊃ ATS) (4) were screened in vitro for their activity against P...
February 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29449015/rapid-initiation-of-guided-bone-regeneration-driven-by-spatiotemporal-delivery-of-il-8-and-bmp-2-from-hierarchical-mbg-based-scaffold
#16
Dan Lin, Yanjun Chai, Yifan Ma, Bing Duan, Yuan Yuan, Changsheng Liu
Initiation of endogenous repair mechanisms, including key steps of stem cell recruitment and cartilage intermediate formation in endochondral ossification, is vital to regeneration of large bone defects. To biomimetically promote a rapid initiation and ensuing osteogenic stimulation, exogenous chemokine IL-8 and growth factor BMP-2 were orchestrated in a mesoporous bioactive glass (MBG)-based spatiotemporal delivery system, to achieve a rapid release of IL-8 followed by a long-term sustained release of BMP-2...
November 17, 2017: Biomaterials
https://www.readbyqxmd.com/read/29448866/multifunctional-mesoporous-silica-nanoparticles-as-efficient-transporters-of-doxorubicin-and-chlorin-e6-for-chemo-photodynamic-combinatorial-cancer-therapy
#17
Jing-Hua Sun, Wei Zhang, Dong-Yang Zhang, Jianliang Shen, Cai-Ping Tan, Liang-Nian Ji, Zong-Wan Mao
A multimodal nanocarrier based on mesoporous silica nanoparticles (MSNs) is developed to co-delivery photosensitizer chlorin e6 (Ce6) and chemotherapeutic agent doxorubicin (Dox) for cancer combination therapy. Ce6 was covalently conjugated with mesoporous silica nanoparticles, which could increase the loading efficiency, and allowed for photodynamic therapy. Doxorubicin was loaded into the pores of mesoporous silica nanoparticles to afford the dual drug delivery system Dox@MSNs-Ce6. These hybrid nanoparticles have an average diameter of about 100 nm and slightly negative charge of about -17 mV...
January 1, 2018: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/29448716/templated-growth-of-pd-nanoparticles-using-sputtering-deposition-process-and-its-catalytic-activities
#18
Dario Eberhardt, Pedro Migowski, Sérgio R Teixeira, Adriano F Feil
A simple method based on sputtering deposition of Pd onto mesoporous SiO2 (SBA-15) was employed to produce supported Pd nanoparticles (NPs) that can be used as hydrogenation catalysts. The use of sputtering deposition eliminates contaminants and avoids additional drawbacks of traditional chemical methods applied to prepare heterogeneous supported metal catalysts. A mechanical resonant stirrer was used to revolve the SBA-15 powder and ensure homogeneous distribution of the Pd NPs over the support. The SBA-15 pores act as templates for Pd NPs and drive nanostructure growth...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448705/dimerization-of-ethylene-to-butenes-over-ordered-mesoporous-silica-sba-15-supported-ni-al-catalysts-with-different-morphologies
#19
Tae-Wan Kim, Jong Won Jun, Seok Il Hong, Chul-Ung Kim
A series of ordered mesoporous silica (OMS) SBA-15 supports with different morphologies were prepared by different synthetic methods to investigate the effect of the characteristics of the morphology of OMS on the ethylene dimerization outcomes. After additions of Ni and Al species into the SBA-15 support, a dimerization reaction of ethylene was performed using a fixed-bed reactor. Rod-type Ni-Al-SBA-15 with a small micron size showed better catalytic performance compared to those of the other catalysts. From these catalytic results, the particle size and morphology of a SBA-15 support critically influenced the catalytic activities and lifetimes of the dimerization catalysts...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448654/fabrication-of-acf-go-pei-composite-for-adsorption-of-methyl-orange-from-aqueous-solution
#20
Liping Wang, Mingyu Zhang, Qizhong Huang, Chenxi Zhao, Kun Luo, Min Lei
ACF/GO/PEI (activated carbon fiber/graphene oxide/polyethyleneimine) composite was fabricated by crosslinking reaction and characterized with Scanning electron microscope (SEM), N2 physical adsorption and Fourier transform infrared spectroscopy (FTIR). Furthermore, the adsorption behavior of ACF/GO/PEI composite for methyl orange (MO) from aqueous solution was investigated. The experimental results showed that the specific surface area of ACF/GO/PEI composite is 1013.6 m2/g and almost the same as that of original ACFs...
March 1, 2018: Journal of Nanoscience and Nanotechnology
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