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microfluidic chip

Dongyue Jiang, Seunguk Lee, Sung Woo Bae, Sung-Yong Park
With the increasing capabilities and ubiquity of smartphones and their associated digital cameras, this study presents a smartphone integrated optoelectrowetting (SiOEW) device as a simple, portable tool capable of on-chip water sample preparation and microscopic detection of the target cells in water samples, which significantly reduce the detection time and the labor cost required for water quality monitoring. A commercially available smartphone is used as a low-intensity portable light source to perform optoelectrowetting (OEW)-based microfluidic operations such as droplet transportation, merging, mixing, and immobilization on a hydrophobic detection zone...
January 15, 2018: Lab on a Chip
Liyuan Zhang, Kaiwen Chen, Haoyue Zhang, Bo Pang, Chang-Hyung Choi, Angelo S Mao, Hongbing Liao, Stefanie Utech, David J Mooney, Huanan Wang, David A Weitz
Controlled encapsulation and pairing of single cells within a confined 3D matrix can enable the replication of the highly ordered cellular structure of human tissues. Microgels with independently controlled compartments that can encapsulate cells within separately confined hydrogel matrices would provide precise control over the route of pairing single cells. Here, a one-step microfluidic method is presented to generate monodisperse multicompartment microgels that can be used as a 3D matrix to pair single cells in a highly biocompatible manner...
January 15, 2018: Small
Xiaonan Xu, Haojun Yuan, Ruyuan Song, Miao Yu, Ho Yin Chung, Youmin Hou, Yuhe Shang, Hongbo Zhou, Shuhuai Yao
Droplet microfluidics, which involves micrometer-sized emulsion droplets on a microfabricated platform, has been demonstrated as a unique system for many biological and chemical applications. Robust and scalable generation of monodisperse droplets at high throughput is of fundamental importance for droplet microfluidics. Classic designs for droplet generation employ shear fluid dynamics to induce the breakup of droplets in a two-phase flow and the droplet size is sensitive to flow rate fluctuations, often resulting in polydispersity...
January 2018: Biomicrofluidics
Adam Kecskemeti, Attila Gaspar
The research and applications of immobilized enzyme reactors (IMERs) have become more and more widespread due to the numerous advantages like reusability, easy handling, prolonged lifetime, easy separation from products and substrate specificity. The miniaturized form of these reactors (microchip IMERs) received outstanding attention due to their special features and advantages over the traditional, larger analytical systems. Large specific surface is essential for the efficient operation of the microreactors, thus these devices include one of the several types of porous solid supports, but in this work only the particle based microchip IMERs are reviewed...
April 1, 2018: Talanta
Eduardo Reátegui, Kristan E van der Vos, Charles P Lai, Mahnaz Zeinali, Nadia A Atai, Berent Aldikacti, Frederick P Floyd, Aimal H Khankhel, Vishal Thapar, Fred H Hochberg, Lecia V Sequist, Brian V Nahed, Bob S Carter, Mehmet Toner, Leonora Balaj, David T Ting, Xandra O Breakefield, Shannon L Stott
Extracellular vesicles (EVs) carry RNA, DNA, proteins, and lipids. Specifically, tumor-derived EVs have the potential to be utilized as disease-specific biomarkers. However, a lack of methods to isolate tumor-specific EVs has limited their use in clinical settings. Here we report a sensitive analytical microfluidic platform (EVHB-Chip) that enables tumor-specific EV-RNA isolation within 3 h. Using the EVHB-Chip, we achieve 94% tumor-EV specificity, a limit of detection of 100 EVs per μL, and a 10-fold increase in tumor RNA enrichment in comparison to other methods...
January 12, 2018: Nature Communications
Isaac Rodriguez-Ruiz, Fabrice Lamadie, Sophie Charton
The reduction of effluents deriving from analytical control is a serious concern in the nuclear industry, for both production and R & D units. In this work we report an alternative methodology for the standard UV-Vis absorbance analyses for acti-nides concentration monitoring along the PUREX (Plutonium Uranium Redox Extraction) process. This methodology, based on Photonic Lab-on-a-chip (PhLoC) technology, enables drastic sampling reduction down to a few microliters, and simulta-neously allows to track concentrations over several orders of magnitude while maintaining a detection linearity range...
January 12, 2018: Analytical Chemistry
Liangbao Yang, Mei Mao, Binbin Zhou, Xianghu Tang, Cheng Chen, Meihong Ge, Pan Li, Xingjiu Huang, Jinhuai Liu
Construction of large area ordered anisotropic nanoparticles monolayer and acquisition of self-assembled interface film are still significant challenges. In this work, we have developed a rapid and valid method to fabricate large-scale close packed nanomaterials at the cyclohexane/water interface in which hydrophilic cetyltrimethylammonium bromide (CTAB) coated nanoparticles, Au nanorods (AuNRs), self-assembled into densely packed two dimensional (2D) arrays by regulating the surface ligand and suitable inducer...
January 11, 2018: Chemistry: a European Journal
Xin Cui, Ya Liu, Dinglong Hu, Weiyi Qian, Chung Tin, Dong Sun, Weiqiang Chen, Raymond H W Lam
Quantitative and dynamic analyses of immune cell secretory cytokines are essential for precise determination and characterization of the "immune phenotype" of patients for clinical diagnosis and treatment of immune-related diseases. Although multiple methods including the enzyme-linked immunosorbent assay (ELISA) have been applied for cytokine detection, such measurements remain very challenging in real-time, high-throughput, and high-sensitivity immune cell analysis. In this paper, we report a highly integrated microfluidic device that allows for on-chip isolation, culture, and stimulation, as well as sensitive and dynamic cytokine profiling of immune cells...
January 12, 2018: Lab on a Chip
Lorenz Jenny, József Dobó, Péter Gál, Gábor Pál, Wilbur A Lam, Verena Schroeder
The complement and coagulation systems closely interact with each other. These interactions are believed to contribute to the proinflammatory and prothrombotic environment involved in the development of thrombotic complications in many diseases. Complement MASP-1 (mannan-binding lectin-associated serine protease-1) activates coagulation factors and promotes clot formation. However, this was mainly shown in purified or plasma-based static systems. Here we describe the role of MASP-1 and complement activation in fibrin clot formation in a microvascular, whole blood flow model...
2018: PloS One
Pedro Urbano Alves, Raquel Vinhas, Alexandra R Fernandes, Semra Zuhal Birol, Levent Trabzon, Iwona Bernacka-Wojcik, Rui Igreja, Paulo Lopes, Pedro Viana Baptista, Hugo Águas, Elvira Fortunato, Rodrigo Martins
Many diseases have their treatment options narrowed and end up being fatal if detected during later stages. As a consequence, point-of-care devices have an increasing importance for routine screening applications in the health sector due to their portability, fast analyses and decreased cost. For that purpose, a multifunctional chip was developed and tested using gold nanoprobes to perform RNA optical detection inside a microfluidic chip without the need of molecular amplification steps. As a proof-of-concept, this device was used for the rapid detection of chronic myeloid leukemia, a hemato-oncological disease that would benefit from early stage diagnostics and screening tests...
January 10, 2018: Scientific Reports
Hoang Hiep Nguyen, Jeho Park, Seungwoo Hwang, Oh Seok Kwon, Chang-Soo Lee, Yong-Beom Shin, Tai Hwan Ha, Moonil Kim
We report the development of on-chip fluorescence switching system based on DNA strand displacement and DNA hybridization for the construction of a rewritable and randomly accessible data storage device. In this study, the feasibility and potential effectiveness of our proposed system was evaluated with a series of wet experiments involving 40 bits (5 bytes) of data encoding a 5-charactered text (KRIBB). Also, a flexible data rewriting function was achieved by converting fluorescence signals between "ON" and "OFF" through DNA strand displacement and hybridization events...
January 10, 2018: Scientific Reports
Yusuke Fuchiwaki, Kenji Goya, Masato Tanaka
Although paper-based microfluidic devices are an ideal platform for point-of-care (POC) diagnostics, it is difficult to achieve microfluidic control required for sensitive analyses such as ELISA on a paper substrate. Here, we present a novel lateral-flow test chip that can perform operations similar to a pump, such as flowing, stopping, and replacing a solution, just by adding the solution onto an inlet port. The chip was fabricated by laminating paper, film, and adhesive tape. For sensitive and accurate detection in an immunoassay, the transparency and flatness of the substrate is crucial for precise analysis of weak light generated by a specific antigen-antibody reaction; however, paper is not flat and is opaque...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
Mohammad Hossein Zarifi, Hamid Sadabadi, S Hossein Hejazi, Mojgan Daneshmand, Amir Sanati-Nezhad
A novel flow sensor is presented to measure the flow rate within microchannels in a real-time, noncontact and nonintrusive manner. The microfluidic device is made of a fluidic microchannel sealed with a thin polymer layer interfacing the fluidics and microwave electronics. Deformation of the thin circular membrane alters the permittivity and conductivity over the sensitive zone of the microwave resonator device and enables high-resolution detection of flow rate in microfluidic channels using non-contact microwave as a standalone system...
January 9, 2018: Scientific Reports
Yuqin Shang, Yong Zeng
Protein glycosylation is one of the key processes that play essential roles in biological functions and dysfunctions. However, progress in glycomics has considerably lagged behind genomics and proteomics, due in part to the enormous challenges associated with the analysis of glycans. Here we present a new integrated and automated microfluidic lectin barcode platform to substantially improve the performance of lectin array for focused glycomic profiling. The chip design and flow control were optimized to promote the lectin-glycan binding kinetics and the speed of lectin microarrays...
2018: Methods in Enzymology
Maria Guarnaccia, Rosario Iemmolo, Floriana San Biagio, Enrico Alessi, Sebastiano Cavallaro
The KRAS oncogene is involved in the pathogenesis of several types of cancer, particularly colorectal cancer (CRC). The most frequent mutations in this gene are associated with poor survival, increased tumor aggressiveness and resistance to therapy with anti-epidermal growth factor receptor (EGFR) antibodies. For this reason, KRAS mutation testing has become increasingly common in clinical practice for personalized cancer treatments of CRC patients. Detection methods for KRAS mutations are currently expensive, laborious, time-consuming and often lack of diagnostic sensitivity and specificity...
January 5, 2018: Sensors
Yanlong Xing, Petra S Dittrich
Microfluidic-based synthesis of one-dimensional (1D) nanostructures offers tremendous advantages over bulk approaches e.g., the laminar flow, reduced sample consumption and control of self-assembly of nanostructures. In addition to the synthesis, the integration of 1D nanomaterials into microfluidic chips can enable the development of diverse functional microdevices. 1D nanomaterials have been used in applications such as catalysts, electronic instrumentation and sensors for physical parameters or chemical compounds and biomolecules and hence, can be considered as building blocks...
January 5, 2018: Sensors
Ren Li, Yan Ma, Minzhi Zhao, Zewen Wei, Zhiyuan Hu
Multiple methods for investigating cell invasion behavior in vitro have proven useful in exploring the mechanisms behind the epithelial-mesenchymal transition (EMT) and EMT-related tumor cell invasion, for example by revealing that cell heterogeneity existed in EMT. However, several hypotheses and predictions regarding EMT heterogeneity have remained unproven because of the inability to quantitatively profile cell invasion at the single cell level. Here, we present a microfluidic chip that provides the capability of simultaneously investigating single cell invasion behavior, phenotypic diversity, and responsiveness to anti-invasion drugs...
January 5, 2018: Analytical Chemistry
Rodolphe Marie, Jonas N Pedersen, Kalim U Mir, Brian Bilenberg, Anders Kristensen
Nucleotide incorporation by DNA polymerase forms the basis of DNA sequencing-by-synthesis. In current platforms, either the single-stranded DNA or the enzyme is immobilized on a solid surface to locate the incorporation of individual nucleotides in space and/or time. Solid-phase reactions may, however, hinder the polymerase activity. We demonstrate a device and a protocol for the enzymatic labeling of genomic DNA arranged in a dense array of single molecules without attaching the enzyme or the DNA to a surface...
January 4, 2018: Nanoscale
Mingrui Sun, Patrick Durkin, Thomas L Toth, Xiaoming He
Microfluidic encapsulation of cells or tissues in biocompatible solid-like hydrogels has wide biomedical applications. However, the microfluidically encapsulated cells/tissues are usually suspended in oil and need to be extracted into aqueous solution for further culture or use. Current extracting techniques are either non-selective for the cell/tissue-laden hydrogel microcapsules or rely on fluorescence labeling of the cells/tissues that may be undesired for their further culture or use. Here we developed a micro-electro-mechanical system to achieve label-free on-chip selective extraction of cell aggregate-laden hydrogel microcapsules from oil into aqueous solution...
January 4, 2018: ACS Sensors
Amandine Virlogeux, Eve Moutaux, Wilhelm Christaller, Aurélie Genoux, Julie Bruyère, Elodie Fino, Benoit Charlot, Maxime Cazorla, Frédéric Saudou
Huntington's disease (HD), a devastating neurodegenerative disorder, strongly affects the corticostriatal network, but the contribution of pre- and postsynaptic neurons in the first phases of disease is unclear due to difficulties performing early subcellular investigations in vivo. Here, we have developed an on-a-chip approach to reconstitute an HD corticostriatal network in vitro, using microfluidic devices compatible with subcellular resolution. We observed major defects in the different compartments of the corticostriatal circuit, from presynaptic dynamics to synaptic structure and transmission and to postsynaptic traffic and signaling, that correlate with altered global synchrony of the network...
January 2, 2018: Cell Reports
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