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microparticle coating

François-Damien Delapierre, Guillaume Mottet, Vélan Taniga, Julie Boisselier, J Viovy, Laurent Malaquin
A novel technology is reported to immobilize different types of particles or cells on a surface at predefined positions with a micrometric precision. The process uses capillary assembly on arrays of crescent-shaped structures with different orientations. Sequential assemblies in different substrate orientations with different types of particles allow for the creation of imbricated and multiplexed arrays. In this work up to four different types of particles were deterministically localized on a surface. Using this process, antibody coated microparticles were assembled on substrates and used as capture patterns for the creation of complex cell networks...
January 10, 2017: Biofabrication
Ena Sokol, Miranda Nijenhuis, Klaas A Sjollema, Marcel F Jonkman, Hendri H Pas, Ben N G Giepmans
Particle bombardment of gold microparticles coated with plasmids, which are accelerated to high velocity, is used for transfection of cells within tissue. Using this method, cDNA encoding proteins of interest introduced into ex vivo living human skin enables studying of proteins of interest in real time. Here, technical aspects of particle bombardment of ex vivo skin are described using green fluorescent protein (GFP) as readout for efficiency. This method can be applied on numerous tissues, including in living model animals...
2017: Methods in Molecular Biology
M Orth, N J Kruse, B J Braun, C Scheuer, J H Holstein, A Khalil, X Yu, W L Murphy, T Pohlemann, M W Laschke, M D Menger
Atrophic non-unions are a major clinical problem. Mineral coated microparticles (MCM) are electrolyte-coated hydroxyapatite particles that have been shown in vitro to bind growth factors electrostatically and enable a tuneable sustained release. Herein, we studied whether MCM can be used in vivo to apply Bone Morphogenetic Protein-2 (BMP-2) to improve bone repair of atrophic non-unions. For this purpose, atrophic non-unions were induced in femurs of CD-1 mice (n = 48). Animals either received BMP-2-coated MCM (MCM + BMP; n = 16), uncoated MCM (MCM; n = 16) or no MCM (NONE; n = 16)...
January 2, 2017: European Cells & Materials
Annalisa Dalmoro, Alexander Y Sitenkov, Sara Cascone, Gaetano Lamberti, Anna Angela Barba, Rouslan I Moustafine
In this study a protocol exploiting the combination of the ultrasonic atomization and the complexation between polyelectrolytes was developed to efficiently encapsulate a hydrophilic chemotherapeutic agent essentially used in the treatment of colon cancer, 5-fluorouracil, in enteric shell-core alginate-based microcarriers. The atomization assisted by ultrasound allowed to obtain small droplets by supplying low energy and avoiding drug degradation. In particular microcarriers were produced in a home-made apparatus where both the core (composed of alginate, drug, and Pluronic F127) and shell (composed of only alginate) feed were separately sent to the coaxial ultrasonic atomizer where they were nebulized and placed in contact with the complexation bulk...
December 26, 2016: International Journal of Pharmaceutics
Egarit Noulsri, Prapaporn Udomwinijsilp, Surada Lerdwana, Viroje Chongkolwatana, Parichart Permpikul
BACKGROUND: There has been an increased interest in platelet-derived microparticles (PMPs) in transfusion medicine. Little is known about PMP status during the preparation of platelet concentrates for transfusion. AIM: The aim of this study is to compare the PMP levels in platelet components prepared using the buffy coat (BC), platelet-rich plasma platelet concentrate (PRP-PC), and apheresis (AP) processes. METHODS: Platelet components were prepared using the PRP-PC and BC processes...
October 25, 2016: Transfusion and Apheresis Science
Sarit Cohen, Hai Haham, Michal Pellach, Shlomo Margel
UV-absorbing nanoparticles (NPs) and microparticles (MPs) were prepared by emulsion and dispersion copolymerization of the vinylic monomer 2-(2'-hydroxy-5'-methacryloxyethylphenyl)-2H-benzotriazole (Norbloc (NB)) with the crosslinking monomer divinylbenzene. The effect of the initiator concentration on the size and size distribution of the polyNB (PNB) particles was elucidated. Thin coatings of the formed PNB NPs or MPs of 19 ± 2 and 200 ± 25 nm dry diameter, respectively, onto polypropylene (PP) films were then prepared and characterized...
December 22, 2016: ACS Applied Materials & Interfaces
Steven Hy Wong, Kamisha L Johnson-Davis, Krista Garrison, Joe D Rankin, Chro S Muhammad
OBJECTIVES: Everolimus (EVR), a mTOR inhibitor immunosuppressant approved for renal, liver and cardiac transplants. This study established the appropriate TDM performances of the Thermo Scientific QMS EVR Assay by using the Beckman DxC, followed by comparison to the Thermo Scientific Indiko and a previously published LC-MS/MS assay, and Beckman AU680 and AU5800 analyzers. DESIGN AND METHODS: The study initially established acceptable linearity, precision and accuracy of the QMS EVR turbidimetric assay...
December 15, 2016: Clinical Biochemistry
Erica L Silva-Freitas, Thales R F Pontes, Rafael P Araújo-Neto, Ítalo H M Damasceno, Kátia L Silva, Juliana F Carvalho, Aldo C Medeiros, Rodolfo B Silva, Amanda K A Silva, Marco A Morales, Eryvaldo S T Egito, Ana L Dantas, Artur S Carriço
The treatment of peptic ulcers induced by H. pylori remains challenging due to the deep mucous layer location of bacteria preventing antimicrobial drug access. The present work aimed to design and evaluate in vitro dual responsive (both pH and magnetic field-sensitive) polymeric magnetic particles loaded with amoxicillin as a smart drug carrier for deep mucous layer penetration and in situ drug release. Magnetite particles were produced by the co-precipitation method and subsequently coated with the Eudragit(®)S100 and amoxicillin by using the spray-drying technique...
December 13, 2016: AAPS PharmSciTech
Xinjuan Zeng, Long Qian, Xianxia Yuan, Cailong Zhou, Zhaowen Li, Jiang Cheng, Shouping Xu, Shuangfeng Wang, Pihui Pi, Xiufang Wen
Inspired by the water-collecting mechanism of the Stenocara beetle's back structure, we prepared a superhydrophilic bumps-superhydrophobic/superoleophilic stainless steel mesh (SBS-SSM) filter via a facile and environmentally friendly method. Specifically, hydrophilic silica microparticles are assembled on the as-cleaned stainless steel mesh surface, followed by further spin-coating with a fluoropolymer/SiO2 nanoparticle solution. On the special surface of SBS-SSM, attributed to the steep surface energy gradient, the superhydrophilic bumps (hydrophilic silica microparticles) are able to capture emulsified water droplets and collect water from the emulsion even when their size is smaller than the pore size of the stainless steel mesh...
December 12, 2016: ACS Nano
Małgorzata Michalska-Jakubus, Otylia Kowal-Bielecka, Vanessa Smith, Maurizio Cutolo, Dorota Krasowska
INTRODUCTION AND AIM: Endothelial microparticles (EMPs) are membrane-coated vesicles shed from endothelial cells and are considered markers of the endothelial state. It has been shown that total numbers of circulating EMPs are increased in patients with systemic sclerosis (SSc), but their clinical correlations have not yet been investigated in detail. We aimed to assess possible relationships between circulating EMPs and clinical as well as laboratory features among SSc patients with special attention to possible association with alteration in microvascular morphology objectified on nailfold videocapillaroscopy and clinical signs of microvascular complications...
November 23, 2016: Microvascular Research
Jing Liu, Hong-Lian Guo, Zhi-Yuan Li
Controlled propulsion of microparticles and micromachines in fluids could revolutionize many aspects of technology, such as biomedicine, microfluidics, micro-mechanics, optomechanics, and cell biology. We report the self-propelled cyclic round-trip motion of metallo-dielectric Janus particles in static line optical tweezers (LOT). The Janus particle is a 5 μm-diameter polystyrene sphere half-coated with 3 nanometer thick gold film. Both experiment and theory show that this cyclic translational and rotational motion is a consequence of the collective and fine action of the gold-face orientation dependent propulsion optical force, the gradient optical force, and the spontaneous symmetry breaking induced optical torque in different regions of the LOT...
December 1, 2016: Nanoscale
Chia-Wen Tsao, Yueh-Pu Lee
In this study, an iron oxide magnetic microparticles and poly(dimethylsiloxane) (MMPs-PDMS) composite material was employed to demonstrate a simple high-strength reversible magnetic bonding method. This paper presents the casting of opaque-view (where optical inspection through the microchannels was impossible) and clear-view (where optical inspection through the microchannel was possible) MMPs-PDMS. The influence of the microchannel geometries on the casting of the opaque-view casting was limited, which is similar to standard PDMS casting...
2016: Science and Technology of Advanced Materials
Han-Joo Yang, Pei Sia Lee, Jaehyeog Choe, Seokjin Suh, Sanghoon Ko
Chitosan (CS) was grafted with 0.1 and 0.5% (w/v) palmitic acid (PA) to improve its encapsulation efficiency (EE) and sustained release characteristics when forming CS microparticles. Thereafter, PA-grafted CS (PA-CS) microparticles were coated with denatured β-lactoglobulin (βlg), which forms an outer protective layer. The possibility of hydrophobic interaction with the hydrophobic substances in the CS microparticles increased as the proportion of the grafted PA increased. EE was measured as 64.79, 83.72, and 85...
April 1, 2017: Food Chemistry
Bugra Ayan, Adem Ozcelik, Hunter Bachman, Shi-Yang Tang, Yuliang Xie, Mengxi Wu, Peng Li, Tony Jun Huang
On-chip microparticle and cell coating technologies enable a myriad of applications in chemistry, engineering, and medicine. Current microfluidic coating technologies often rely on magnetic labeling and concurrent deflection of particles across laminar streams of chemicals. Herein, we introduce an acoustofluidic approach for microparticle and cell coating by implementing tilted-angle standing surface acoustic waves (taSSAWs) into microchannels with multiple inlets. The primary acoustic radiation force generated by the taSSAW field was exploited in order to migrate the particles across the microchannel through multiple laminar streams, which contained the buffer and coating chemicals...
October 18, 2016: Lab on a Chip
Woo Jin Lee, Sang Woo Han, Insang You, Song-Ee Choi, Unyong Jeong, Jin Woong Kim
A robust and straightforward approach for fabrication of a new type of colloidal pressure sensor was proposed. For this purpose, we synthesized uniform conductive magnetic-patchy microparticles using a microfluidic technique and then coated them with poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) layers using the layer-by-layer deposition. Finally we showed that the magnetic-patchy conductive microparticles could be positioned on the target sites while precisely detecting pressure changes with excellent sensitivity...
October 11, 2016: Chemical Communications: Chem Comm
Hamad Alyami, Jasdip Koner, Eman Z Dahmash, James Bowen, David Terry, Afzal R Mohammed
OBJECTIVES: The aim of this study was to investigate the influence of process parameters during dry coating on particle and dosage form properties upon varying the surface adsorbed moisture of microcrystalline cellulose (MCC), a model filler/binder for orally disintegrating tablets (ODTs). METHODS: The moisture content of MCC was optimised using the spray water method and analysed using thermogravimetric analysis. Microproperty/macroproperty assessment was investigated using atomic force microscopy, nano-indentation, scanning electron microscopy, tablet hardness and disintegration testing...
October 2, 2016: Journal of Pharmacy and Pharmacology
Geneviève Marcoux, Anne-Claire Duchez, Matthieu Rousseau, Tania Lévesque, Luc H Boudreau, Louis Thibault, Eric Boilard
On activation, platelets release vesicles called microparticles (MPs). MPs are heterogeneous with regard to the presence or absence of mitochondria. We quantified MPs in platelet concentrates (PCs) taking their mitochondrial content into account. Platelet-rich plasma (PRP), buffy coat (BC) and apheresis (AP) PCs were tested through 7 days of storage. A combination of flow cytometry and spanning-tree progression analysis of density-normalized events (SPADE) was used to determine MP and mitochondrial release during storage...
September 29, 2016: Platelets
Kunsuk Koh, Hyejin Hwang, Choojin Park, Jae Yong Lee, Tae Yoon Jeon, Shin-Hyun Kim, Jin Kon Kim, Unyong Jeong
This work introduces a robust means for excellent position registry of microparticles via a forced assembly technique on flexible or stretchable substrates. It is based on the dry powder rubbing process which allows assembly of a microparticle monolayer in a short time without requiring any solvent or thermal treatment. Elastic physical templates are used as substrates for the forced assembly in this study. Since the elastic templates can reduce the stress accumulation between the closely packed particles, they can minimize the defect formation in the particle assembly in large areas...
October 4, 2016: ACS Applied Materials & Interfaces
Hiraku Onishi, Ayako Tokuyasu
BACKGROUND: The production of protein drugs has recently increased due to advances in biotechnology, but their clinical use is generally limited to parenteral administration due to low absorption in non-parenteral administration. Therefore, non-parenteral delivery systems allowing sufficient absorption draw much attention. METHODS: Microparticles (MP) were prepared using chitosan-4-thio-butylamidine conjugate (Ch-TBA), trimethyl-chitosan (TMC), and chitosan (Ch)...
September 13, 2016: International Journal of Molecular Sciences
Yong Zhang, Lili Cui, Feng Li, Nianqiu Shi, Chunlei Li, Xianghui Yu, Yan Chen, Wei Kong
Nano/micro-carrier systems have shown promising application in the biomedical field as various delivery carriers. The composite material and fabrication method determine their microstructures, properties and thus their potential applications. Since approved as tablet coating material by the U.S. Food and Drug Administration (US-FDA), zein has been widely investigated as one of protein-based materials in the past few decades. Zein is renewable, biodegradable and relatively inexpensive in comparison with animal proteins (e...
November 20, 2016: International Journal of Pharmaceutics
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