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Strohmaier-Nguyen D, Horn C, Baeumner AJ. Sample-to-answer lateral flow assay with integrated plasma separation and NT-proBNP detection. Anal Bioanal Chem 2024:10.1007/s00216-024-05271-3. [PMID: 38589616 DOI: 10.1007/s00216-024-05271-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/20/2024] [Accepted: 03/22/2024] [Indexed: 04/10/2024]
Abstract
Through enabling whole blood detection in point-of-care testing (POCT), sedimentation-based plasma separation promises to enhance the functionality and extend the application range of lateral flow assays (LFAs). To streamline the entire process from the introduction of the blood sample to the generation of quantitative immune-fluorescence results, we combined a simple plasma separation technique, an immunoreaction, and a micropump-driven external suction control system in a polymer channel-based LFA. Our primary objective was to eliminate the reliance on sample-absorbing separation membranes, the use of active separation forces commonly found in POCT, and ultimately allowing finger prick testing. Combining the principle of agglutination of red blood cells with an on-device sedimentation-based separation, our device allows for the efficient and fast separation of plasma from a 25-µL blood volume within a mere 10 min and overcomes limitations such as clogging, analyte adsorption, and blood pre-dilution. To simplify this process, we stored the agglutination agent in a dried state on the test and incorporated a filter trench to initiate sedimentation-based separation. The separated plasma was then moved to the integrated mixing area, initiating the immunoreaction by rehydration of probe-specific fluorophore-conjugated antibodies. The biotinylated immune complex was subsequently trapped in the streptavidin-rich detection zone and quantitatively analyzed using a fluorescence microscope. Normalized to the centrifugation-based separation, our device demonstrated high separation efficiency of 96% and a yield of 7.23 µL (= 72%). Furthermore, we elaborate on its user-friendly nature and demonstrate its proof-of-concept through an all-dried ready-to-go NT-proBNP lateral flow immunoassay with clinical blood samples.
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Affiliation(s)
- Dan Strohmaier-Nguyen
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053, Regensburg, Germany
| | - Carina Horn
- Roche Diagnostics GmbH, 68305, Mannheim, Germany
| | - Antje J Baeumner
- Institute of Analytical Chemistry, Chemo- and Biosensors, University of Regensburg, 93053, Regensburg, Germany.
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2
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Li PR, Kiran Boilla S, Wang CH, Lin PC, Kuo CN, Tsai TH, Lee GB. A self-driven, microfluidic, integrated-circuit biosensing chip for detecting four cardiovascular disease biomarkers. Biosens Bioelectron 2024; 249:115931. [PMID: 38215636 DOI: 10.1016/j.bios.2023.115931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/23/2023] [Accepted: 12/11/2023] [Indexed: 01/14/2024]
Abstract
Cardiovascular diseases (CVDs) claimed the lives of nearly 21 million people worldwide in 2021, accounting for 30% of global deaths. However, one in five CVD patients is unaware that they have the disease, emphasizing the need for accurate biomarker monitoring. Herein we developed an integrated microfluidic system (IMS) for rapid quantification of four CVD biomarkers, including N-terminal pro B-type natriuretic peptide (NT-proBNP), fibrinogen, cardiac troponin I (cTnI), and C-reactive protein (CRP)- via aptamer-coated interdigitated electrodes (IDE) with integrated circuits (IC) and a self-driven IMS for sample treatment. The device was composed of plasma filtration, metering, and fluidic delay modules, and the former could extract 45% of plasma from a 20-μL blood sample; the metering module could quantify 5 μL of plasma within 90 s. Subsequently, the plasma was transported to a detection chamber, where IC-based IDE sensors made measurements within 5 min. The entire 15-min process allowed us to evaluate biomarkers across a wide dynamic range: NT-proBNP (0.1-10,000 pg/mL), fibrinogen (50-1,000 mg/dL), cTnI (0.1-10,000 pg/mL), and CRP (0.5-9 mg/L). Given that spiked blood samples were measured with reasonable accuracy (>80%), the IMS could see utility in CVD risk assessment and personalized medicine.
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Affiliation(s)
- Pei-Rong Li
- Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Sasi Kiran Boilla
- Institute of Nanoengineering and Microsystems, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Chih-Hung Wang
- Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
| | - Pei-Chien Lin
- Department of Electronic Engineering, National Chung Cheng University, Chiayi, 62102, Taiwan
| | - Chien-Nan Kuo
- Institute of Electronics, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan
| | - Tsung-Heng Tsai
- Industry Academy Innovation School, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.
| | - Gwo-Bin Lee
- Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan; Institute of Nanoengineering and Microsystems, National Tsing Hua University, Hsinchu, 30013, Taiwan.
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3
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Keyvani F, Debnath N, Ayman Saleh M, Poudineh M. An integrated microfluidic electrochemical assay for cervical cancer detection at point-of-care testing. Nanoscale 2022; 14:6761-6770. [PMID: 35506790 DOI: 10.1039/d1nr08252c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Cervical cancer (CC) is a major health care problem in low- and middle-income countries, necessitating the development of low-cost and easy-to-use assays for CC detection at point-of-care (POC) settings. An integrated microfluidic electrochemical assay for CC detection, named IMEAC, is presented that has the potential for identifying CC circulating DNA in whole blood samples. The IMEAC consists of two main modules: a plasma separator device that isolates plasma from whole blood with high purity and without the need for any external forces connected to a graphene oxide-based electrochemical biosensor that uses specific probe molecules for the detection of CC circulating DNA molecules. We fully characterize the performance of the individual modules and show that the integrated assay can be utilized for target DNA detection in whole blood samples, thus potentially transforming CC detection and screening at remote locations.
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Affiliation(s)
- Fatemeh Keyvani
- Department of Electrical and Computer Engineering, Faculty of Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
| | - Nandini Debnath
- Department of Electrical and Computer Engineering, Faculty of Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
| | - Mahmoud Ayman Saleh
- Department of Electrical and Computer Engineering, Faculty of Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
- Energy Materials Laboratory, School of Sciences and Engineering, The American University in Cairo, New Cairo 11835, Egypt
| | - Mahla Poudineh
- Department of Electrical and Computer Engineering, Faculty of Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
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4
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Wang Y, Nunna BB, Talukder N, Etienne EE, Lee ES. Blood Plasma Self-Separation Technologies during the Self-Driven Flow in Microfluidic Platforms. Bioengineering (Basel) 2021; 8:94. [PMID: 34356201 PMCID: PMC8301051 DOI: 10.3390/bioengineering8070094] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 06/19/2021] [Accepted: 06/30/2021] [Indexed: 02/06/2023] Open
Abstract
Blood plasma is the most commonly used biofluid in disease diagnostic and biomedical analysis due to it contains various biomarkers. The majority of the blood plasma separation is still handled with centrifugation, which is off-chip and time-consuming. Therefore, in the Lab-on-a-chip (LOC) field, an effective microfluidic blood plasma separation platform attracts researchers' attention globally. Blood plasma self-separation technologies are usually divided into two categories: active self-separation and passive self-separation. Passive self-separation technologies, in contrast with active self-separation, only rely on microchannel geometry, microfluidic phenomena and hydrodynamic forces. Passive self-separation devices are driven by the capillary flow, which is generated due to the characteristics of the surface of the channel and its interaction with the fluid. Comparing to the active plasma separation techniques, passive plasma separation methods are more considered in the microfluidic platform, owing to their ease of fabrication, portable, user-friendly features. We propose an extensive review of mechanisms of passive self-separation technologies and enumerate some experimental details and devices to exploit these effects. The performances, limitations and challenges of these technologies and devices are also compared and discussed.
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Affiliation(s)
- Yudong Wang
- Advanced Energy Systems and Microdevices Laboratory, Department of Mechanical and Industrial Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (Y.W.); (B.B.N.); (N.T.); (E.E.E.)
| | - Bharath Babu Nunna
- Advanced Energy Systems and Microdevices Laboratory, Department of Mechanical and Industrial Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (Y.W.); (B.B.N.); (N.T.); (E.E.E.)
- Division of Engineering in Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Harvard University, Cambridge, MA 02139, USA
| | - Niladri Talukder
- Advanced Energy Systems and Microdevices Laboratory, Department of Mechanical and Industrial Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (Y.W.); (B.B.N.); (N.T.); (E.E.E.)
| | - Ernst Emmanuel Etienne
- Advanced Energy Systems and Microdevices Laboratory, Department of Mechanical and Industrial Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (Y.W.); (B.B.N.); (N.T.); (E.E.E.)
| | - Eon Soo Lee
- Advanced Energy Systems and Microdevices Laboratory, Department of Mechanical and Industrial Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA; (Y.W.); (B.B.N.); (N.T.); (E.E.E.)
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5
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Affiliation(s)
- Vijai Laxmi
- Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
| | - Suhas S. Joshi
- Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
| | - Amit Agrawal
- Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
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6
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Affiliation(s)
- Vijai Laxmi
- Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
| | - Suhas S Joshi
- Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
| | - Amit Agrawal
- Indian Institute of Technology, Bombay, Powai, Mumbai 400076, India
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Qiu X, Jiang H, Zhang X, Li K, Ge S, Xia N, Mauk MG. A plasma separator with a multifunctional deformable chamber equipped with a porous membrane for point-of-care diagnostics. Analyst 2020; 145:6138-6147. [PMID: 32869771 DOI: 10.1039/d0an01014f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Traditionally, plasma is extracted from whole blood using centrifuges in clinical laboratories, which is unsuitable for on-site testing. For point-of-care diagnostics, for example in HIV tests, to ensure the detection sensitivity for low-abundance analytical targets, a relatively large volume of plasma needs to be extracted from milliliters of blood with a simpler and easier-to-operate method than centrifugation. We report the development of a membrane-assisted, sedimentation-facilitated plasma separator with a multifunctional deformable chamber, which is able to perform plasma separation from undiluted whole blood in a short time. Multiple steps related to plasma separation, including cell sedimentation, cell filtration, and plasma driving and discharging, are all performed in or through the multifunctional deformable chamber equipped with a top-layer porous membrane, which significantly reduces the device complexity. Assisted by a simple jig or even hands, plasma separation can be conveniently performed upon mechanical actuation of the deformable chamber. Within 8 min, ∼130 μL of plasma can be conveniently extracted with the described device from 2.3 mL of whole blood. It has been demonstrated that HIV antibodies or virus spiked in whole blood can be successfully detected with reasonable sensitivity from the extracted plasma with the described pump-free device.
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Affiliation(s)
- Xianbo Qiu
- Institute of Microfluidic Chip Development in Biomedical Engineering, College of Information Science and Technology, Beijing University of Chemical Technology, Beijing, 100029, China.
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Song K, Zhang L, Zhou Z, Huang R, Zheng X. Synchronization and control of capillary flows in rectangular microchannel with spacers. Biomicrofluidics 2020; 14:044105. [PMID: 32699565 PMCID: PMC7368666 DOI: 10.1063/5.0010175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 07/02/2020] [Indexed: 06/11/2023]
Abstract
Liquid control in microchannels is quite important in microfluidic devices used in, for example, lab-on-a-chip and point-of-care applications. Capillary microfluidics, being self-powered, is especially advantageous for use in passive devices, and has attracted significant attention. In this paper, capillary flows in rectangular microchannels with spacers are studied experimentally and theoretically; in particular, capillary flow synchronization (or waiting) behavior is identified and investigated. Based on changes of channel walls, two basic synchronization modes are proposed for flows isolated by spacers in a channel. Experimental results show that the velocities of faster capillary flows are reduced by the liquid pinning effect and that the time delay between two capillary flows is automatically balanced. The synchronization behavior of capillary flows is explained by analyzing the time delay, contact angle variation, and capillary forces. In addition, the quantity of liquid flowing out of the waiting channels is estimated and verified. Then a model for the change in contact angle during synchronization is derived and verified. Finally, we conceive a series of studies of the control of capillary flows for different spacer designs and conduct an experiment to study the dynamic behaviors of a number of capillary flows by adding many spacers in a microchannel. This study expands the applications of capillary microfluidics.
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Affiliation(s)
- Kui Song
- College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China
| | - Lina Zhang
- College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China
| | - Zheng Zhou
- College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China
| | - Ruijie Huang
- College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, Hunan, China
| | - Xu Zheng
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
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9
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Gao Q, Chang Y, Deng Q, You H. A simple and rapid method for blood plasma separation driven by capillary force with an application in protein detection. Anal Methods 2020; 12:2560-2570. [PMID: 32930282 DOI: 10.1039/d0ay00240b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Blood plasma separation is a vital sample pre-treatment procedure for microfluidic devices in blood diagnostics, and it requires reliability and speediness. In this work, we propose a novel and simple method for microvolume blood plasma separation driven by capillary force. Flat-shaped filter membranes combined with hydrophilic narrow capillaries are introduced into devices, in order to reduce the residual volumes of blood plasma. An interference fit is used to ensure no leakage of blood or cells. There is desired trapping efficiency of blood cells in the devices. The method provides high efficiency with a plasma extraction yield of 71.7% within 6 min, using 60 μL of undiluted whole human blood with 45% haematocrit. The influence from structural parameters on the separation kinetics and the dependence of the haematocrit levels on the separation efficiency are also investigated. The total protein detection shows considerable protein recovery of 82.3% in the extracted plasma. Thus, the plasma separation unit with a very simple structure is suitable for integrating into microfluidic devices, presenting promising prospects for clinical diagnostics as well as for point-of-care testing applications.
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Affiliation(s)
- Qingxue Gao
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China
- University of Science and Technology of China, Hefei, Anhui 230026, PR China
| | - Yongjia Chang
- Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China
| | - Qingmei Deng
- Department of Laboratory, Cancer Hospital, Chinese Academy of Sciences, Hefei, Anhui 230031, PR China
| | - Hui You
- School of Mechanical Engineering, Guangxi University, Nanning, Guangxi 530004, PR China.
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10
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Kumar P, Agrawal P, Chatterjee K. Challenges and opportunities in blood flow through porous substrate: A design and interface perspective of dried blood spot. J Pharm Biomed Anal 2019; 175:112772. [DOI: 10.1016/j.jpba.2019.07.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 07/09/2019] [Accepted: 07/10/2019] [Indexed: 12/13/2022]
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11
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Yang CH, Hsieh YL, Tsou PH, Li BR. Thermopneumatic suction integrated microfluidic blood analysis system. PLoS One 2019; 14:e0208676. [PMID: 30845239 DOI: 10.1371/journal.pone.0208676] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 02/13/2019] [Indexed: 01/21/2023] Open
Abstract
Blood tests provide crucial diagnostic information regarding several diseases. A key factor that affects the precision and accuracy of blood tests is the interference of red blood cells; however, the conventional methods of blood separation are often complicated and time consuming. In this study, we devised a simple but high-efficiency blood separation system on a self-strained microfluidic device that separates 99.7 ± 0.3% of the plasma in only 6 min. Parameters, such as flow rate, design of the filter trench, and the relative positions of the filter trench and channel, were optimized through microscopic monitoring. Moreover, this air-difference-driven device uses a cost-effective and easy-to-use heater device that creates a low-pressure environment in the microchannel within minutes. With the aforementioned advantages, this blood separation device could be another platform choice for point-of-care testing.
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12
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Yap BK, M Soair SN, Talik NA, Lim WF, Mei I L. Potential Point-of-Care Microfluidic Devices to Diagnose Iron Deficiency Anemia. Sensors (Basel) 2018; 18:E2625. [PMID: 30103424 PMCID: PMC6111990 DOI: 10.3390/s18082625] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 07/18/2018] [Accepted: 07/18/2018] [Indexed: 12/20/2022]
Abstract
Over the past 20 years, rapid technological advancement in the field of microfluidics has produced a wide array of microfluidic point-of-care (POC) diagnostic devices for the healthcare industry. However, potential microfluidic applications in the field of nutrition, specifically to diagnose iron deficiency anemia (IDA) detection, remain scarce. Iron deficiency anemia is the most common form of anemia, which affects billions of people globally, especially the elderly, women, and children. This review comprehensively analyzes the current diagnosis technologies that address anemia-related IDA-POC microfluidic devices in the future. This review briefly highlights various microfluidics devices that have the potential to detect IDA and discusses some commercially available devices for blood plasma separation mechanisms. Reagent deposition and integration into microfluidic devices are also explored. Finally, we discuss the challenges of insights into potential portable microfluidic systems, especially for remote IDA detection.
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Affiliation(s)
- Boon Kar Yap
- Electronics and Communication Department, College of Engineering, Universiti Tenaga Nasional, KM-7 Jalan Uniten-Ikram, 43000 Kajang, Selangor, Malaysia.
| | - Siti Nur'Arifah M Soair
- Electronics and Communication Department, College of Engineering, Universiti Tenaga Nasional, KM-7 Jalan Uniten-Ikram, 43000 Kajang, Selangor, Malaysia.
| | - Noor Azrina Talik
- Electronics and Communication Department, College of Engineering, Universiti Tenaga Nasional, KM-7 Jalan Uniten-Ikram, 43000 Kajang, Selangor, Malaysia.
- Institute of Power Electronics (IPE), College of Engineering, Universiti Tenaga Nasional, KM-7 Jalan Uniten-Ikram, 43000 Kajang, Selangor, Malaysia.
| | - Wai Feng Lim
- Integrative Pharmacogenomics Institute (iPROMISE), Universiti Teknologi MARA Selangor, Puncak Alam Campus, 42300 Bandar Puncak Alam, Selangor, Malaysia.
| | - Lai Mei I
- Department of Pathology, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
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Iqbal R, Majhy B, Sen AK. Facile Fabrication and Characterization of a PDMS-Derived Candle Soot Coated Stable Biocompatible Superhydrophobic and Superhemophobic Surface. ACS Appl Mater Interfaces 2017; 9:31170-31180. [PMID: 28829562 DOI: 10.1021/acsami.7b09708] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We report a simple, inexpensive, rapid, and one-step method for the fabrication of a stable and biocompatible superhydrophobic and superhemophobic surface. The proposed surface comprises candle soot particles embedded in a mixture of PDMS+n-hexane serving as the base material. The mechanism responsible for the superhydrophobic behavior of the surface is explained, and the surface is characterized based on its morphology and elemental composition, wetting properties, mechanical and chemical stability, and biocompatibility. The effect of %n-hexane in PDMS, the thickness of the PDMS+n-hexane layer (in terms of spin coating speed) and sooting time on the wetting property of the surface is studied. The proposed surface exhibits nanoscale surface asperities (average roughness of 187 nm), chemical compositions of soot particles, very high water and blood repellency along with excellent mechanical and chemical stability and excellent biocompatibility against blood sample and biological cells. The water contact angle and roll-off angle is measured as 160° ± 1° and 2°, respectively, and the blood contact angle is found to be 154° ± 1°, which indicates that the surface is superhydrophobic and superhemophobic. The proposed superhydrophobic and superhemophobic surface offers significantly improved (>40%) cell viability as compared to glass and PDMS surfaces.
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Affiliation(s)
- R Iqbal
- Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai 600036, India
| | - B Majhy
- Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai 600036, India
| | - A K Sen
- Department of Mechanical Engineering, Indian Institute of Technology Madras , Chennai 600036, India
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14
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Affiliation(s)
- Ayantika Sett
- Dept. of Chemical Engineering; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
| | - Uzma Bano
- Dept. of Chemical Engineering; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
| | - Sunando DasGupta
- Dept. of Chemical Engineering; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
| | - Debasish Sarkar
- Dept. of Chemical Engineering; University of Calcutta; Kolkata 700009 India
| | - Arijit Mitra
- Dept. of Metallurgical and Material Engineering; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
| | - Siddhartha Das
- Dept. of Metallurgical and Material Engineering; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
| | - Swagata Dasgupta
- Dept. of Chemistry; Indian Institute of Technology Kharagpur; Kharagpur 721302 India
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15
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Maria MS, Rakesh PE, Chandra TS, Sen AK. Capillary flow-driven microfluidic device with wettability gradient and sedimentation effects for blood plasma separation. Sci Rep 2017; 7:43457. [PMID: 28256564 PMCID: PMC5335260 DOI: 10.1038/srep43457] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 01/24/2017] [Indexed: 12/12/2022] Open
Abstract
We report a capillary flow-driven microfluidic device for blood-plasma separation that comprises a cylindrical well between a pair of bottom and top channels. Exposure of the well to oxygen-plasma creates wettability gradient on its inner surface with its ends hydrophilic and middle portion hydrophobic. Due to capillary action, sample blood self-infuses into bottom channel and rises up the well. Separation of plasma occurs at the hydrophobic patch due to formation of a ‘self-built-in filter’ and sedimentation. Capillary velocity is predicted using a model and validated using experimental data. Sedimentation of RBCs is explained using modified Steinour’s model and correlation between settling velocity and liquid concentration is found. Variation of contact angle on inner surface of the well is characterized and effects of well diameter and height and dilution ratio on plasma separation rate are investigated. With a well of 1.0 mm diameter and 4.0 mm height, 2.0 μl of plasma was obtained (from <10 μl whole blood) in 15 min with a purification efficiency of 99.9%. Detection of glucose was demonstrated with the plasma obtained. Wetting property of channels was maintained by storing in DI water under vacuum and performance of the device was found to be unaffected over three weeks.
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Affiliation(s)
- M Sneha Maria
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India.,Department of Biotechnology, Indian Institute of Technology Madras, Chennai-600036, India
| | - P E Rakesh
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India
| | - T S Chandra
- Department of Biotechnology, Indian Institute of Technology Madras, Chennai-600036, India
| | - A K Sen
- Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai-600036, India
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