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https://www.readbyqxmd.com/read/28551133/enzyme-free-chemiluminescence-immunoassay-for-the-determination-of-thyroid-stimulating-hormone
#1
Chaeyoon Shim, Richard Chong, Ji Hoon Lee
Based on the chemiluminescent resonance energy transfer (CRET) from high-energy intermediate formed in 1,1'-oxalyldiimidazole chemiluminescence (ODI-CL) reaction to fluorescent microsphere-conjugated detection antibody, a cost-effective and highly sensitive enzyme-free sandwich immunoassay with chemiluminescence detection was developed for the early diagnosis of thyroid cancer. Thyroid stimulating hormone (TSH) primary antibody immobilized on paramagnetic bead captures rapidly TSH in human serum within 15min...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28551121/sensitive-surface-enhanced-raman-spectroscopy-sers-detection-of-methotrexate-by-core-shell-satellite-magnetic-microspheres
#2
Miao Chen, Wen Luo, Zhimin Zhang, Fawei Zhu, Sen Liao, Hua Yang, Xiaoqing Chen
An effective approach for fabricating core-shell-satellite magnetic microspheres was developed to form a sub-10nm positively charged mesoporous silica (mSiO2) interlayer, which was applied to enrich samples and create sufficient hotspots between the inner Fe3O4@Ag core and outer assembled gold nanoparticles (AuNPs) satellites. Based on the prepared Fe3O4@Ag/mSiO2/AuNPs (FASA) as SERS substrates, a sensitive and label-free detection of methotrexate in serum was successfully realized. The positively charged mSiO2 interlayer exhibited strong capability in enriching methotrexate through the electrostatic interaction...
August 15, 2017: Talanta
https://www.readbyqxmd.com/read/28548174/the-mechanism-change-by-switching-the-reactants-from-water-to-hydroxyl-ions-for-electrocatalytic-water-oxidation-a-case-study-of-copper-oxide-microspheres
#3
Xiaoqiang Du, Jingwei Huang, Yong Ding
Developing noble metal-free water oxidation catalysts is essential for many energy conversion/storage processes (e.g., water splitting). Herein, we report a facile synthesis of CuO microspheres composed of ultrathin, single-crystal-like nanosheets via a simple solution method. The as-obtained CuO microspheres can serve as an active and stable water oxidation catalyst under electrochemical reaction conditions, owing to their unique structural features. In electrochemical water oxidation, this catalyst affords a current density of 10 mA cm(-2) (a value related to practical relevance) at an overpotential of ∼0...
May 26, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28546911/graphene-based-polymer-bilayers-with-superior-light-driven-properties-for-remote-construction-of-3d-structures
#4
Zhenhua Tang, Ziwei Gao, Shuhai Jia, Fei Wang, Yonglin Wang
3D structure assembly in advanced functional materials is important for many areas of technology. Here, a new strategy exploits IR light-driven bilayer polymeric composites for autonomic origami assembly of 3D structures. The bilayer sheet comprises a passive layer of poly(dimethylsiloxane) (PDMS) and an active layer comprising reduced graphene oxides (RGOs), thermally expanding microspheres (TEMs), and PDMS. The corresponding fabrication method is versatile and simple. Owing to the large volume expansion of the TEMs, the two layers exhibit large differences in their coefficients of thermal expansion...
May 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28545731/enzyme-linked-immunoassay-based-on-imprinted-microspheres-for-the-detection-of-sulfamethazine-residue
#5
Dapeng Peng, Zhaozhou Li, Yulian Wang, Zhenli Liu, Feng Sheng, Zonghui Yuan
This study attempts to develop an enzyme-linked immunoassay (ELISA) using a molecularly imprinted polymer (MIP) as an artificial recognition element. The MIP microspheres were prepared using precipitation polymerization with SM2 as the template molecule, methacrylic acid as the functional monomer and ethylene glycol dimethacrylate as the cross-linker. After the microspheres were coated in microtiter plate wells, the molecular imprinting ELISA (MI-ELISA) method was established based on the direct competition between free SM2 and horseradish peroxidase (HRP)-labelled SM2 in heterogeneous mode...
May 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28544521/oral-nucleic-acid-therapy-using-multicompartmental-delivery-systems
#6
REVIEW
Husain Attarwala, Murui Han, Jonghan Kim, Mansoor Amiji
Nucleic acid-based therapeutics has the potential for treating numerous diseases by correcting abnormal expression of specific genes. Lack of safe and efficacious delivery strategies poses a major obstacle limiting clinical advancement of nucleic acid therapeutics. Oral route of drug administration has greater delivery challenges, because the administered genes or oligonucleotides have to bypass degrading environment of the gastrointestinal (GI) tract in addition to overcoming other cellular barriers preventing nucleic acid delivery...
May 24, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28544389/bimetal-organic-framework-derivation-of-ball-cactus-like-ni-sn-p-c-cnt-as-long-cycle-anode-for-lithium-ion-battery
#7
Ruoling Dai, Weiwei Sun, Li-Ping Lv, Minghong Wu, Hao Liu, Guoxiu Wang, Yong Wang
Metal phosphides are a new class of potential high-capacity anodes for lithium ion batteries, but their short cycle life is the critical problem to hinder its practical application. A unique ball-cactus-like microsphere of carbon coated NiP2 /Ni3 Sn4 with deep-rooted carbon nanotubes (Ni-Sn-P@C-CNT) is demonstrated in this work to solve this problem. Bimetal-organic-frameworks (BMOFs, Ni-Sn-BTC, BTC refers to 1,3,5-benzenetricarboxylic acid) are formed by a two-step uniform microwave-assisted irradiation approach and used as the precursor to grow Ni-Sn@C-CNT, Ni-Sn-P@C-CNT, yolk-shell Ni-Sn@C, and Ni-Sn-P@C...
May 22, 2017: Small
https://www.readbyqxmd.com/read/28544255/a-new-polyoxometalate-pom-based-composite-%C3%AF-fabrication-through-pom-assisted-polymerization-of-dopamine-and-properties-as-anode-materials-for-high-performance-lithium-ion-battery
#8
Yan-Hong Ding, Jun Peng, Shifa-Ullah Khan, Yue Yuan
Organic substrates are indispensable to fabricate multi-functional polyoxometalate (POM)-based composites for various application fields. A new Molybdovanadophosphoric heteropolyacid (PMo10V2)-based polydopamine (PDA) composite (PMo10V2/PDA) has been firstly synthesized through a facile in-situ polymerization method under hydrothermal conditions without adding extra buffer solution. The obtained PMo10V2/PDA composite shows homogeneous microsphere morphology. By utilizing the adhesive ability of PDA, the composite can be used as an anode material without additional binder for rechargeable lithium ion batteries...
May 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28542454/controlled-delivery-of-tauroursodeoxycholic-acid-from-biodegradable-microspheres-slows-retinal-degeneration-and-vision-loss-in-p23h-rats
#9
Laura Fernández-Sánchez, Irene Bravo-Osuna, Pedro Lax, Alicia Arranz-Romera, Victoria Maneu, Sergio Esteban-Pérez, Isabel Pinilla, María Del Mar Puebla-González, Rocío Herrero-Vanrell, Nicolás Cuenca
Successful drug therapies for treating ocular diseases require effective concentrations of neuroprotective compounds maintained over time at the site of action. The purpose of this work was to assess the efficacy of intravitreal controlled delivery of tauroursodeoxycholic acid (TUDCA) encapsulated in poly(D,L-lactic-co-glycolic acid) (PLGA) microspheres for the treatment of the retina in a rat model of retinitis pigmentosa. PLGA microspheres (MSs) containing TUDCA were produced by the O/W emulsion-solvent evaporation technique...
2017: PloS One
https://www.readbyqxmd.com/read/28537756/chemoembolization-adopting-polyethylene-glycol-drug-eluting-embolics-loaded-with-doxorubicin-for-the-treatment-of-hepatocellular-carcinoma
#10
Camillo Aliberti, Riccardo Carandina, Donatella Sarti, Luca Mulazzani, Enrico Pizzirani, Stefano Guadagni, Giammaria Fiorentini
OBJECTIVE: The purpose of this study is to determine the efficacy and tolerability of transarterial chemoembolization (TACE) using polyethylene glycol (PEG) drug-elutable microspheres loaded with doxorubicin for treatment of hepatocellular carcinoma (HCC). SUBJECTS AND METHODS: Forty-two patients with unresectable HCC, as determined by a tumor board, were assigned to undergo TACE and were treated with PEG drug-elutable embolics loaded with doxorubicin. Patients were prospectively enrolled and included 32 (76%) men and 10 (24%) women...
May 24, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28537482/programmed-platelet-derived-growth-factor-%C3%AE-%C3%AE-and-bone-morphogenetic-protein-2-delivery-from-a-hybrid-calcium-phosphate-alginate-scaffold
#11
Emily A Bayer, Jahnelle Jordan, Riccardo Gottardi, Morgan Fedorchak, Prashant N Kumta, Steven Little
Bone tissue engineering requires the upregulation of several regenerative stages, including a critical early phase of angiogenesis. Previous studies have suggested that a sequential delivery of PDGF to BMP-2 could promote angiogenic tubule formation when delivered to in vitro co-cultures of human umbilical vein endothelial cells (HUVECs) and human mesenchymal stem cells (hMSCs). However, it was previously unclear that this PDGF to BMP-2 delivery schedule will result in cell migration into the scaffolding system and affect the later expression of bone markers...
May 24, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28536968/clinical-and-imaging-based-prognostic-factors-in-radioembolisation-of-liver-metastases-from-colorectal-cancer-a-retrospective-exploratory-analysis
#12
Kathy P Willowson, Aimee R Hayes, David L H Chan, Michael Tapner, Elizabeth J Bernard, Richard Maher, Nick Pavlakis, Stephen J Clarke, Dale L Bailey
BACKGROUND: The aim of this study was to investigate the relationship between absorbed dose and response of colorectal cancer liver metastases treated with [(90)Y]-resin microspheres and to explore possible clinical and imaging derived prognostic factors. METHODS: FDG PET/CT was used to measure response of individual lesions to a measured absorbed dose, derived from post-treatment (90)Y PET imaging. Predicted dose was also derived from planning [(99m)Tc]-MAA SPECT data...
December 2017: EJNMMI Research
https://www.readbyqxmd.com/read/28536897/validation-of-myocardial-perfusion-quantification-by-dynamic-ct-in-an-ex-vivo-porcine-heart-model
#13
Gert Jan Pelgrim, Marco Das, Sjoerd van Tuijl, Marly van Assen, Frits W Prinzen, Marco Stijnen, Matthijs Oudkerk, Joachim E Wildberger, Rozemarijn Vliegenthart
To test the accuracy of quantification of myocardial perfusion imaging (MPI) using computed tomography (CT) in ex-vivo porcine models. Five isolated porcine hearts were perfused according to Langendorff. Hearts were perfused using retrograde flow through the aorta and blood flow, blood pressure and heart rate were monitored throughout the experiment. An inflatable cuff was placed around the circumflex (Cx) artery to create stenosis grades which were monitored using a pressure wire, analysing perfusion at several fractional flow reserve values of 1...
May 23, 2017: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/28536312/effects-of-ginsenoside-rg1-loaded-alginate-chitosan-microspheres-on-human-bone-marrow-stromal-cells
#14
Yu-Hai Guo, Shuai Zhao, Yan-Xin Du, Qing-Jia Xing, Bo-Lai Chen, Chu-Qin Yu
The ginsenoside Rg1 is the most abundant compound of ginseng. Recent studies showed that Rg1 had neuroprotective effect on neuronal cells. This study was to prepare Rg1-loaded alginate-chitosan microspheres and research the effects of the microspheres on human bone marrow stromal cell (hBMSC). The alginate-chitosan microspheres were prepared by mechanical emulsification technique in combination with ion (Ca(2+)) and chitosan solidification. Subsequently, the microspheres were employed to load ginseng extracts Rg1...
May 23, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28535884/development-of-surface-imprinted-nanospheres-using-the-inverse-suspension-polymerization-method-for-electrochemical-ultra-sensing-of-dacarbazine
#15
Bhim Bali Prasad, Purnendu Kumar Pathak
A new ultra sensing molecularly imprinted polymer beads modified pencil graphite electrode was fabricated, with the help of the inverse suspension polymerization technique, for ascertaining the adequate supplementation of dacarbazine in the cancer treatment. The inverse suspension polymerization technique was beneficial in obtaining surface imprinted polymer-based electrocatalytic nanospheres with narrow size distribution. These nanospheres were found to be superior to the corresponding microspheres and planar films, in terms of electrode kinetics and sensitivity, with the differential pulse anodic stripping voltammetric transduction...
June 29, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28535028/preparation-of-highly-thermally-conductive-polymer-composite-at-low-filler-content-via-a-self-assembly-process-between-polystyrene-microsphere-and-boron-nitride-nanosheet
#16
Xiongwei Wang, Peiyi Wu
Rational distribution and orientation of boron nitride nanosheets (BNNSs) are very significant for a polymer/BNNS composite to obtain a high thermal conductivity at low filler content. In this paper, a high-performance thermal interface material based on exfoliated BNNSs and polystyrene microspheres was fabricated by latex blending and subsequent compression molding. In this case, BNNSs and polystyrene (PS) microspheres would firstly self-asemble to form the complex microspheres via strong electrostatic interactions between them...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28533032/design-and-synthesis-of-an-immobilized-metal-affinity-chromatography-and-metal-oxide-affinity-chromatography-hybrid-material-for-improved-phosphopeptide-enrichment
#17
Da-Song Yang, Xi-Ying Ding, Hong-Ping Min, Bo Li, Meng-Xiang Su, Miao-Miao Niu, Bin Di, Fang Yan
Reversible phosphorylation of proteins is one of the most important post-translational modifications, while the detection of phosphopeptides is difficult due to their low abundance and the signal suppression of nonphosphorylated peptides. Therefore, selective enrichment of phosphopeptides from highly complicated mixtures is vital for MS-based phosphoproteome analysis. Despite various strategies have been developed, there is no single method that is capable of providing full coverage of the whole phosphoproteome...
May 10, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28532902/adipose-derived-delivery-vehicle-for-encapsulated-adipogenic-factors
#18
Christopher M Mahoney, Arta Kelmindi-Doko, Malik J Snowden, J Peter Rubin, Kacey G Marra
Hydrogels derived from adipose tissue extracellular matrix (AdECM) have shown potential in the ability to generate new adipose tissue in vivo. To further enhance adipogenesis, a composite adipose derived delivery system (CADDS) containing single- and double-walled dexamethasone encapsulated microspheres (SW and DW Dex MS) has been developed. Previously, our laboratory has published the use of Dex MS as an additive to enhance adipogenesis and angiogenesis in adipose tissue grafts. In the current work, AdECM and CADDS are extensively characterized, in addition to conducting in vitro cell culture analysis...
May 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28532101/sonochemical-synthesis-of-fructose-1-6-bisphosphate-dicalcium-porous-microspheres-and-their-application-in-promotion-of-osteogenic-differentiation
#19
Chao Qi, Ding Zhou, Ying-Jie Zhu, Tuan-Wei Sun, Feng Chen, Chang-Qing Zhang
Human bone mesenchymal stem cells (hBMSCs) have the ability to differentiate into bone and cartilage for clinical bone regeneration. Biomaterials with an innate ability to stimulate osteogenic differentiation of hBMSCs into bone and cartilage are considered attractive candidates for the applications in bone tissue engineering and regeneration. In this paper, we synthesized fructose 1,6-bisphosphate dicalcium (Ca2FBP) porous microspheres by the sonochemical method, and investigated the ability of Ca2FBP for the promotion of the osteogenic differentiation of hBMSCs...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28532080/antibiotic-loaded-microspheres-as-antimicrobial-delivery-systems-for-medical-applications
#20
J Szczeblinska, K Fijalkowski, J Kohn, M El Fray
In this paper, we present the preparation and antibiotic loading of polymeric microspheres, composed of copolymers derived from fatty acid/amino acid components, as new polymeric platforms for antibiotic delivery systems. New polymeric materials were used to prepare microspheres with and without immobilized model antibiotics (streptomycin, chloramphenicol and amphotericin B) by a W/O/W double-emulsion/solvent evaporation method, in which chloroform and poly(vinyl alcohol) are used as the solvent and emulsifier, respectively...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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