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High throughput microfluidics

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https://www.readbyqxmd.com/read/28434976/compartmentalized-microfluidic-perfusion-system-to-culture-human-induced-pluripotent-stem-cell-aggregates
#1
Yuki Kondo, Koji Hattori, Shota Tashiro, Eri Nakatani, Ryosuke Yoshimitsu, Taku Satoh, Shinji Sugiura, Toshiyuki Kanamori, Kiyoshi Ohnuma
Microfluidic perfusion systems enable small-volume cell cultures under precisely controlled microenvironments, and are typically developed for cell-based high-throughput screening. However, most such systems are designed to manipulate dissociated single cells, not cell aggregates, and are thus unsuitable to induce differentiation in human induced pluripotent stem cells (hiPSCs), which is conventionally achieved by using cell aggregates to increase cell-cell interactions. We have now developed a compartmentalized microfluidic perfusion system with large flow channels to load, culture, and observe cell aggregates...
April 20, 2017: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/28431925/analysis-of-pm2-5-induced-cytotoxicity-in-human-hacat-cells-based-on-a-microfluidic-system
#2
Yuxiao Zhang, Lulu Zheng, Jiang Tuo, Qi Liu, Xinlian Zhang, Zhixuan Xu, Sixiu Liu, Guodong Sui
Human exposure to PM2.5 causes several adverse health effects. Skin is the first barrier against harmful environmental substances and can has direct contact with PM2.5, but there is no study about PM2.5-induced cytotoxicity in human skin cells on the molecular level partially due to the shortcomings of traditional research methods. In present study, we established a microfluidic system including a cell culture chip integrated with a high-throughput protein microarray chip to investigate the mechanism of PM2...
April 18, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28430279/microcontact-printing-with-aminosilanes-creating-biomolecule-micro-and-nanoarrays-for-multiplexed-microfluidic-bioassays
#3
Shivani Sathish, Sébastien G Ricoult, Kazumi Toda-Peters, Amy Q Shen
Microfluidic systems integrated with protein and DNA micro- and nanoarrays have been the most sought-after technologies to satisfy the growing demand for high-throughput disease diagnostics. As the sensitivity of these systems relies on the bio-functionalities of the patterned recognition biomolecules, the primary concern has been to develop simple technologies that enable biomolecule immobilization within microfluidic devices whilst preserving bio-functionalities. To address this concern, we introduce a two-step patterning approach to create micro- and nanoarrays of biomolecules within microfluidic devices...
April 21, 2017: Analyst
https://www.readbyqxmd.com/read/28426762/human-microrna-299-3p-decreases-invasive-behavior-of-cancer-cells-by-downregulation-of-oct4-expression-and-causes-apoptosis
#4
Axel R Göhring, Stefanie Reuter, Joachim H Clement, Xinlai Cheng, Jannick Theobald, Stefan Wölfl, Ralf Mrowka
PURPOSE: Oct4 was reported to be one of the most important pluripotency transcription factors in the biology of stem cells including cancer stem cells, and progressed malignant cells. Here we report the investigation of gene expression control of Oct4 by selected human microRNAs and the physiological effect of Oct4 silencing in invasive cancer cells. METHODS AND RESULTS: High throughput luciferase activity assay revealed the microRNA-299-3p to be the most effective in reducing gene expression of Oct4, which was confirmed by Western blot analysis and Oct4 promoter activity in a target luciferase assay...
2017: PloS One
https://www.readbyqxmd.com/read/28418112/photoresponsive-passive-micromixers-based-on-spiropyran-size-tunable-hydrogels
#5
Jeroen Ter Schiphorst, Giuseppe G Melpignano, Hossein Eslami Amirabadi, Menno H J M Houben, Sterre Bakker, Jaap M J den Toonder, Albertus P H J Schenning
Microfluidic devices allow the manipulation of fluids down to the micrometer scale and are receiving a lot of attention for applications where low volumes and high throughputs are required. In these micro channels, laminar flow usually dominates, which requires long residence times of the fluids, limiting the flow speed and throughput. Here a switchable passive mixer has been developed to control mixing and to easily clean microchannels. The mixer is based on a photoresponsive spiropyran based hydrogel of which the dimensions can be tuned by changing the intensity of the light...
April 18, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28412635/particle-manipulations-in-non-newtonian-microfluidics-a-review
#6
REVIEW
Xinyu Lu, Chao Liu, Guoqing Hu, Xiangchun Xuan
Microfluidic devices have been widely used since 1990s for diverse manipulations of particles (a general term of beads, cells, vesicles, drops, etc.) in a variety of applications. Compared to the active manipulation via an externally imposed force field, the passive manipulation of particles exploits the flow-induced intrinsic lift and/or drag to control particle motion with several advantages. Along this direction, inertial microfluidics has received tremendous interest in the past decade due to its capability to handle a large volume of samples at a high throughput...
April 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28409636/signal-on-photoelectrochemical-immunoassay-for-aflatoxin-b1-based-on-enzymatic-product-etching-mno2-nanosheets-for-dissociation-of-carbon-dots
#7
Youxiu Lin, Qian Zhou, Dianping Tang, Reinhard Niessner, Dietmar Knopp
Aflatoxin B1 (AFB1) monitoring has attracted extensive attention because food safety is a worldwide public health problem. Herein, we design a novel simultaneously visual and photoelectrochemical (PEC) immunosensing system for rapid sensitive detection of AFB1 in foodstuff. The immunoreaction was carried out on anti-AFB1 antibody-modified magnetic beads by using glucose oxidase (GOx)-labeled AFB1-bovine serum albumin (AFB1-BSA) conjugates as the tags with a competitive-type immunoassay format, while the visual and PEC evaluation was performed via carbon quantum dots (CQDs)-functionalized MnO2 nanosheets...
April 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28404902/mechanism-of-modulation-through-pi3k-akt-pathway-about-nepeta-cataria-l-s-extract-in-non-small-cell-lung-cancer
#8
Jiaxin Fan, Yongrui Bao, Xiansheng Meng, Shuai Wang, Tianjiao Li, Xin Chang, Guanlin Yang, Tao Bo
Non-small cell lung cancer (NSCLC) is regarded as one of the major intractable diseases, which was cured mainly by chemotherapeutics in the clinical treatment at present. But it is still a vital mission for the current medical and researchers that hunting a natural medicine which have little side effects and high-efficiency against the NSCLC on account of the shortcomings on current drugs. Nepeta cataria L. plays an important role in anti-cancer treatment according to the reports which was recorded in the Chinese Pharmacopoeia of version 2015 and belongs to one of the Traditional Chinese medicine (TCM)...
February 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/28402889/unbiased-high-precision-cell-mechanical-measurements-with-microconstrictions
#9
Janina R Lange, Claus Metzner, Sebastian Richter, Werner Schneider, Monika Spermann, Thorsten Kolb, Graeme Whyte, Ben Fabry
We describe a quantitative, high-precision, high-throughput method for measuring the mechanical properties of cells in suspension with a microfluidic device, and for relating cell mechanical responses to protein expression levels. Using a high-speed (750 fps) charge-coupled device camera, we measure the driving pressure Δp, maximum cell deformation εmax, and entry time tentry of cells in an array of microconstrictions. From these measurements, we estimate population averages of elastic modulus E and fluidity β (the power-law exponent of the cell deformation in response to a step change in pressure)...
April 11, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28402212/high-efficiency-and-high-throughput-on-chip-exchange-of-the-continuous-phase-in-droplet-microfluidic-systems
#10
Minkyu Kim, Chia Min Leong, Ming Pan, Lucas R Blauch, Sindy K Y Tang
This article describes an integrated platform for the on-chip exchange of the continuous phase in droplet microfluidic systems. The drops used in this work are stabilized by amphiphilic nanoparticles. For some characterizations and applications of these nanoparticle-stabilized drops, including the measurement of adsorption dynamics of nanoparticles to the droplet surface, it is necessary to change the composition of the continuous phase from that used during the droplet generation process. Thus far, no work has reported the exchange of the continuous phase for a large number (>1 million) of drops in a microfluidic system...
February 1, 2017: SLAS Technology
https://www.readbyqxmd.com/read/28399328/high-throughput-label-free-single-cell-microalgal-lipid-screening-by-machine-learning-equipped-optofluidic-time-stretch-quantitative-phase-microscopy
#11
Baoshan Guo, Cheng Lei, Hirofumi Kobayashi, Takuro Ito, Yaxiaer Yalikun, Yiyue Jiang, Yo Tanaka, Yasuyuki Ozeki, Keisuke Goda
The development of reliable, sustainable, and economical sources of alternative fuels to petroleum is required to tackle the global energy crisis. One such alternative is microalgal biofuel, which is expected to play a key role in reducing the detrimental effects of global warming as microalgae absorb atmospheric CO2 via photosynthesis. Unfortunately, conventional analytical methods only provide population-averaged lipid amounts and fail to characterize a diverse population of microalgal cells with single-cell resolution in a non-invasive and interference-free manner...
April 11, 2017: Cytometry. Part A: the Journal of the International Society for Analytical Cytology
https://www.readbyqxmd.com/read/28398608/online-flowing-colloidosomes-for-sequential-multi-analyte-high-throughput-sers-analysis
#12
Gia Chuong Phan-Quang, Elizabeth Hui Zi Wee, Fengling Yang, Hiang Kwee Lee, In Yee Phang, Xiaotong Feng, Ramón A Alvarez-Puebla, Xing Yi Ling
3D plasmonic colloidosomes are superior SERS sensors owing to their high sensitivity and excellent tolerance to laser misalignment. Herein, we incorporate plasmonic colloidosomes in a microfluidic channel for online SERS detection. Our method resolves the poor signal reproducibility and inter-sample contamination in the existing online SERS platforms. Our flow system offers rapid and continuous online detection of 20 samples in less than 5 min with excellent signal reproducibility. The isolated colloidosomes prevent cross-sample and channel contamination, allowing accurate quantification of samples over a concentration range of five orders of magnitude...
April 11, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28397489/a-facile-droplet-chip-time-resolved-inductively-coupled-plasma-mass-spectrometry-online-system-for-determination-of-zinc-in-single-cell
#13
Han Wang, Beibei Chen, Man He, Bin Hu
Single cell analysis is a significant research field in recent years reflecting the heterogeneity of cells in a biological system. In this work, a facile droplet chip was fabricated and online combined with time-resolved inductively coupled plasma mass spectrometry (ICPMS) via a microflow nebulizer for the determination of zinc in single HepG2 cells. On the focusing geometric designed PDMS microfluidic chip, the aqueous cell suspension was ejected and divided by hexanol to generate droplets. The droplets encapsulated single cells remain intact during the transportation into ICP for subsequent detection...
April 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28396895/multi-chamber-microfluidic-platform-for-high-precision-skin-permeation-testing
#14
M Alberti, Y Dancik, G Sriram, B Wu, Y L Teo, Z Feng, M Bigliardi-Qi, R G Wu, Z P Wang, P L Bigliardi
The established in vitro tool used for testing the absorption and penetration of chemicals through skin in pharmacology, toxicology and cosmetic science is the static Franz diffusion cell. While widespread, Franz cells are relatively costly, low-throughput and results may suffer from poor reproducibility. Microfluidics has the potential to overcome these drawbacks. In this paper, we present a novel microfluidic skin permeation platform and validate it rigorously against the Franz cell by comparing the transport of 3 model chemicals of varying lipophilicity: caffeine, salicylic acid and testosterone...
April 11, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28396707/microfluidics-for-genome-wide-studies-involving-next-generation-sequencing
#15
REVIEW
Sai Ma, Travis W Murphy, Chang Lu
Next-generation sequencing (NGS) has revolutionized how molecular biology studies are conducted. Its decreasing cost and increasing throughput permit profiling of genomic, transcriptomic, and epigenomic features for a wide range of applications. Microfluidics has been proven to be highly complementary to NGS technology with its unique capabilities for handling small volumes of samples and providing platforms for automation, integration, and multiplexing. In this article, we review recent progress on applying microfluidics to facilitate genome-wide studies...
March 2017: Biomicrofluidics
https://www.readbyqxmd.com/read/28392839/recent-advances-in-microscale-western-blotting
#16
Brittany J Sanders, Daniel C Kim, Robert C Dunn
Western blotting is a ubiquitous tool used extensively in the clinical and research settings to identify proteins and characterize their levels. It has rapidly become a mainstay in research laboratories due to its specificity, low cost, and ease of use. The specificity arises from the orthogonal processes used to identify proteins. Samples are first separated based on size and then probed with antibodies specific for the protein of interest. This confirmatory approach helps avoid pitfalls associated with antibody cross-reactivity and specificity issues...
October 21, 2016: Analytical Methods: Advancing Methods and Applications
https://www.readbyqxmd.com/read/28386077/an-assay-system-for-point-of-care-diagnosis-of-tuberculosis-using-commercially-manufactured-pcb-technology
#17
Daniel Evans, Konstantinos I Papadimitriou, Louise Greathead, Nikolaos Vasilakis, Panagiotis Pantelidis, Peter Kelleher, Hywel Morgan, Themistoklis Prodromakis
Rapid advances in clinical technologies, detection sensitivity and analytical throughput have delivered a significant expansion in our knowledge of prognostic and diagnostic biomarkers in many common infectious diseases, such as Tuberculosis (TB). During the last decade, a significant number of approaches to TB diagnosis have been attempted at Point-of-Care (PoC), exploiting a large variation of techniques and materials. In this work, we describe an electronics-based Enzyme-Linked ImmunoSorbent Assay (eELISA), using a Lab-on-a-Printed Circuit Board (LoPCB) approach, for TB diagnosis based on cytokine detection...
April 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28378146/use-of-a-highly-parallel-microfluidic-flow-cell-array-to-determine-therapeutic-drug-dose-response-curves
#18
Jesús A Arellano, Taylor A Howell, James Gammon, Sungpil Cho, Margit M Janát-Amsbury, Bruce Gale
A high-throughput, microfluidic flow cell array (MFCA) system has been modified to enable drug screening against small-volume cell-, and tissue cultures. The MFCA is composed of a 3D channel network that simultaneously flows fluids through forty-eight 830 μm by 500 μm flow cells, which physically divide and fluidically seal an existing culture into multiple compartments when docked onto the surface of a cell or tissue culture dish. The modified system provides temperature (37 °C) and CO2/pH level controls, while continuously flowing solutions (media or other liquid such as drug suspensions) over the cells/tissues...
June 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28374582/detection-of-enzyme-inhibitors-in-crude-natural-extracts-using-droplet-based-microfluidics-coupled-to-hplc
#19
Abraham Ochoa, Enrique Álvarez-Bohórquez, Eduardo Castillero, Luis F Olguin
Natural product screening for new bioactive compounds can greatly benefit from low reagents consumption and high throughput capacity of droplet-based microfluidic systems. However, the creation of large droplet libraries in which each droplet carries a different compound is a challenging task. A possible solution is to use an HPLC coupled to a droplet generating microfluidic device to sequentially encapsulate the eluting compounds. In this work we demonstrate the feasibility of carrying out enzyme inhibiting assays inside nano-liter droplets with the different components of a natural crude extract after being separated by a coupled HPLC column...
April 4, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28352869/biophysical-isolation-and-identification-of-circulating-tumor-cells
#20
James Che, Victor Yu, Edward B Garon, Jonathan W Goldman, Dino Di Carlo
Isolation and enumeration of circulating tumor cells (CTCs) from blood is important for determining patient prognosis and monitoring treatment. Methods based on affinity to cell surface markers have been applied to both purify (via immunoseparation) and identify (via immunofluorescence) CTCs. However, variability of cell biomarker expression associated with tumor heterogeneity and evolution and cross-reactivity of antibody probes have long complicated CTC enrichment and immunostaining. Here, we report a truly label-free high-throughput microfluidic approach to isolate, enumerate, and characterize the biophysical properties of CTCs using an integrated microfluidic device...
April 11, 2017: Lab on a Chip
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