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Song Z, Lin ES, Uddin MH, Abid HA, Ong JW, Ng TW. Graphene Oxide Paper Manipulation of Micro-Reactor Drops. MICROMACHINES 2023; 14:1306. [PMID: 37512618 PMCID: PMC10384384 DOI: 10.3390/mi14071306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 06/22/2023] [Accepted: 06/24/2023] [Indexed: 07/30/2023]
Abstract
Digital microfluidics, which relies on the movement of drops, is relatively immune to clogging problems, making it suited for micro-reactor applications. Here, graphene oxide paper of 100 μm thickness, fabricated by blade coating sedimented dispersions onto roughened substrates, followed by drying and mechanical exfoliation, was found to be relatively free of cracks and curling. It also exhibited high wettability and elasto-capillary characteristics. Possessing low enough stiffness, it could rapidly and totally self-wrap water drops of 20 μL volume placed 2 mm from its edge when oriented between 0 and 60° to the horizontal. This complete wrapping behavior allowed drops to be translated via movement of the paper over long distances without dislodgement notwithstanding accelerations and decelerations. An amount of 2 drops that were wrapped with separate papers, when collided with each other at speeds up to 0.64 m/s, were found to eschew coalescence. This portends the development of robust digital microfluidic approaches for micro-reactors.
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Affiliation(s)
- Zhixiong Song
- Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Eric Shen Lin
- Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Md Hemayet Uddin
- Melbourne Centre for Nanofabrication, 151 Wellington Rd., Clayton, VIC 3168, Australia
| | - Hassan Ali Abid
- Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Jian Wern Ong
- Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Tuck Wah Ng
- Laboratory for Optics and Applied Mechanics, Department of Mechanical & Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
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2
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Apostolakis A, Barmpakos D, Pilatis A, Belessi V, Pagonis DN, Jaber F, Aidinis K, Kaltsas G. Study of Single and Multipass f-rGO Inkjet-Printed Structures with Various Concentrations: Electrical and Thermal Evaluation. SENSORS (BASEL, SWITZERLAND) 2023; 23:2058. [PMID: 36850655 PMCID: PMC9959197 DOI: 10.3390/s23042058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/03/2023] [Accepted: 02/06/2023] [Indexed: 06/18/2023]
Abstract
Reduced graphene oxide (rGO) is a derivative of graphene, which has been widely used as the conductive pigment of many water-based inks and is recognized as one of the most promising graphene-based materials for large-scale and low-cost production processes. In this work, we evaluate a custom functionalised reduced graphene oxide ink (f-rGO) via inkjet-printing technology. Test line structures were designed and fabricated by the inkjet printing process using the f-rGO ink on a pretreated polyimide substrate. For the electrical characterisation of these devices, two-point (2P) and four-point (4P) probe measurements were implemented. The results showed a major effect of the number of printed passes on the resulting resistance for all ink concentrations in both 2P and 4P cases. Interesting results can be extracted by comparing the obtained multipass resistance values that results to similar effective concentration with less passes. These measurements can provide the ground to grasp the variation in resistance values due to the different ink concentrations, and printing passes and can provide a useful guide in achieving specific resistance values with adequate precision. Accompanying topography measurements have been conducted with white-light interferometry. Furthermore, thermal characterisation was carried out to evaluate the operation of the devices as temperature sensors and heaters. It has been found that ink concentration and printing passes directly influence the performance of both the temperature sensors and heaters.
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Affiliation(s)
- Apostolos Apostolakis
- microSENSES Laboratory, Department of Electrical and Electronics Engineering, University of West Attica, 12244 Athens, Greece
| | - Dimitris Barmpakos
- microSENSES Laboratory, Department of Electrical and Electronics Engineering, University of West Attica, 12244 Athens, Greece
| | - Aggelos Pilatis
- microSENSES Laboratory, Department of Electrical and Electronics Engineering, University of West Attica, 12244 Athens, Greece
- Department of Naval Architecture, University of West Attica, 12244 Athens, Greece
| | - Vassiliki Belessi
- Department of Graphic Design and Visual Communication, Graphic Arts Technology Study Direction, University of West Attica, 12243 Athens, Greece
| | | | - Fadi Jaber
- Department of Biomedical Engineering, Ajman University, Ajman P.O. Box 346, United Arab Emirates
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman P.O. Box 346, United Arab Emirates
| | - Konstantinos Aidinis
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman P.O. Box 346, United Arab Emirates
- Department of Electrical and Computer Engineering, Ajman University, Ajman P.O. Box 346, United Arab Emirates
| | - Grigoris Kaltsas
- microSENSES Laboratory, Department of Electrical and Electronics Engineering, University of West Attica, 12244 Athens, Greece
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Tong Z, Shen C, Li Q, Yin H, Mao H. Combining sensors and actuators with electrowetting-on-dielectric (EWOD): advanced digital microfluidic systems for biomedical applications. Analyst 2023; 148:1399-1421. [PMID: 36752059 DOI: 10.1039/d2an01707e] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The concept of digital microfluidics (DMF) enables highly flexible and precise droplet manipulation at a picoliter scale, making DMF a promising approach to realize integrated, miniaturized "lab-on-a-chip" (LOC) systems for research and clinical purposes. Owing to its simplicity and effectiveness, electrowetting-on-dielectric (EWOD) is one of the most commonly studied and applied effects to implement DMF. However, complex biomedical assays usually require more sophisticated sample handling and detection capabilities than basic EWOD manipulation. Alternatively, combined systems integrating EWOD actuators and other fluidic handling techniques are essential for bringing DMF into practical use. In this paper, we briefly review the main approaches for the integration/combination of EWOD with other microfluidic manipulation methods or additional external fields for specified biomedical applications. The form of integration ranges from independently operating sub-systems to fully coupled hybrid actuators. The corresponding biomedical applications of these works are also summarized to illustrate the significance of these innovative combination attempts.
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Affiliation(s)
- Zhaoduo Tong
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. .,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chuanjie Shen
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. .,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qiushi Li
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
| | - Hao Yin
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China. .,Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hongju Mao
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
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Barmpakos D, Belessi V, Xanthopoulos N, Krontiras CA, Kaltsas G. Flexible Inkjet-Printed Heaters Utilizing Graphene-Based Inks. SENSORS (BASEL, SWITZERLAND) 2022; 22:1173. [PMID: 35161917 PMCID: PMC8839321 DOI: 10.3390/s22031173] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/28/2022] [Accepted: 01/31/2022] [Indexed: 02/01/2023]
Abstract
Thermal sensors are mainly based on the selective heating of specific areas, which in most cases is a critical feature for both the operation and the performance of the thermal device. In this work, we evaluate the thermoelectrical response of two graphitic materials, namely (a) a commercial 2.4%wt graphene-ethyl cellulose dispersion in cycloxehanone and terpineol (G) and (b) a custom functionalized reduced graphene oxide (f-rGO) ink in the range of -40 to 100 °C. Both inks were printed on a flexible polyimide substrate and the Thermal Coefficients of Resistance (TCR) were extracted as TCRG = -1.05 × 10-3 °C-1 (R2 = 0.9938) and TCRf-rGO = -3.86 × 10-3 °C-1 (R2 = 0.9967). Afterward, the inkjet-printed devices were evaluated as microheaters, in order to exploit their advantage for cost-effective production with minimal material waste. f-rGO and G printed heaters reached a maximum temperature of 97.5 °C at 242 mW and 89.9 °C at 314 mW, respectively, applied by a constant current source and monitored by an infrared camera. Repeatability experiments were conducted, highlighting the high robustness in long-term use. The power-temperature behavior was extracted by self-heating experiments to demonstrate the ability of the devices to serve as heaters. Both static and dynamic evaluation were performed in order to study the device behaviors and extract the corresponding parameters. After all the experimental processes, the resistance of the samples was again evaluated and found to differ less than 13% from the initial value. In this work, fabrication via inkjet printing and demonstration of efficient and stable microheaters utilizing a custom ink (f-rGO) and a commercial graphene ink are presented. This approach is suitable for fabricating selectively heated geometries on non-planar substrate with high repeatability and endurance in heat cycles.
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Affiliation(s)
- Dimitris Barmpakos
- microSENSES Laboratory, Department of Electrical and Electronics Engineering, University of West Attica, 122 43 Athens, Greece;
| | - Vassiliki Belessi
- Department of Graphic Design and Visual Communication, University of West Attica, 122 43 Athens, Greece;
| | | | | | - Grigoris Kaltsas
- microSENSES Laboratory, Department of Electrical and Electronics Engineering, University of West Attica, 122 43 Athens, Greece;
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Valikhani D, Bolivar JM, Pelletier JN. An Overview of Cytochrome P450 Immobilization Strategies for Drug Metabolism Studies, Biosensing, and Biocatalytic Applications: Challenges and Opportunities. ACS Catal 2021. [DOI: 10.1021/acscatal.1c02017] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Donya Valikhani
- Department of Chemistry, Université de Montréal and Center for Green Chemistry and Catalysis (CGCC), 1375 Thérèse-Lavoie-Roux Ave., Montréal, Quebec H2 V 0B3, Canada
- PROTEO, The Québec Network for Research on Protein Function, Engineering and Applications, Québec City Quebec G1 V 0A6, Canada
| | - Juan M. Bolivar
- Chemical and Materials Engineering Department, Faculty of Chemical Sciences, Complutense University of Madrid, Complutense Ave., 28040 Madrid, Spain
| | - Joelle N. Pelletier
- Department of Chemistry, Université de Montréal and Center for Green Chemistry and Catalysis (CGCC), 1375 Thérèse-Lavoie-Roux Ave., Montréal, Quebec H2 V 0B3, Canada
- PROTEO, The Québec Network for Research on Protein Function, Engineering and Applications, Québec City Quebec G1 V 0A6, Canada
- Department of Biochemistry, Université de Montréal, 2900 Édouard-Montpetit ave, Montréal, Quebec H3T 1J4, Canada
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Sathyanarayanan G, Haapala M, Sikanen T. Digital Microfluidics-Enabled Analysis of Individual Variation in Liver Cytochrome P450 Activity. Anal Chem 2020; 92:14693-14701. [PMID: 33099994 DOI: 10.1021/acs.analchem.0c03258] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The superfamily of hepatic cytochrome P450 (CYP) enzymes is responsible for the intrinsic clearance of the majority of therapeutic drugs in humans. However, the kinetics of drug clearance via CYPs varies significantly among individuals due to both genetic and external factors, and the enzyme amount and function are also largely impacted by many liver diseases. In this study, we developed a new methodology, based on digital microfluidics (DMF), for rapid determination of individual alterations in CYP activity from human-derived liver samples in biopsy-scale. The assay employs human liver microsomes (HLMs), immobilized on magnetic beads to facilitate determination of the activity of microsomal CYP enzymes in a parallelized system at physiological temperature. The thermal control is achieved with the help of a custom-designed, inkjet-printed microheater array modularly integrated with the DMF platform. The CYP activities are determined with the help of prefluorescent, enzyme-selective model compounds by quantifying the respective fluorescent metabolites based on optical readout in situ. The selectivity and sensitivity of the assay was established for four different CYP model reactions, and the diagnostic concept was validated by determining the interindividual variation in one of the four model reaction activities, that is, ethoxyresorufin O-deethylation (CYP1A1/2), between five donors. Overall, the developed protocol consumes only about 15 μg microsomal protein per assay. It is thus technically adaptable to screening of individual differences in CYP enzyme function from biopsy-scale liver samples in an automated fashion, so as to support tailoring of medical therapies, for example, in the context of liver disease diagnosis.
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Affiliation(s)
- Gowtham Sathyanarayanan
- Faculty of Pharmacy, Drug Research Program, Division of Pharmaceutical Chemistry and Technology University of Helsinki, Viikinkaari 5 E 00014, Finland
| | - Markus Haapala
- Faculty of Pharmacy, Drug Research Program, Division of Pharmaceutical Chemistry and Technology University of Helsinki, Viikinkaari 5 E 00014, Finland
| | - Tiina Sikanen
- Faculty of Pharmacy, Drug Research Program, Division of Pharmaceutical Chemistry and Technology University of Helsinki, Viikinkaari 5 E 00014, Finland
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7
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Winning the numbers game in enzyme evolution - fast screening methods for improved biotechnology proteins. Curr Opin Struct Biol 2020; 63:123-133. [PMID: 32615371 DOI: 10.1016/j.sbi.2020.05.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 04/28/2020] [Accepted: 05/08/2020] [Indexed: 01/02/2023]
Abstract
The booming demand for environmentally benign industrial processes relies on the ability to quickly find or engineer a biocatalyst suitable to ideal process conditions. Both metagenomic approaches and directed evolution involve the screening of huge libraries of protein variants, which can only be managed reasonably by flexible platforms for (ultra)high-throughput profiling against the desired criteria. Here, we review the most recent additions toward a growing toolbox of versatile assays using fluorescence, absorbance and mass spectrometry readouts. While conventional solution based high-throughput screening in microtiter plate formats is still important, the implementation of novel screening protocols for microfluidic cell or droplet sorting systems supports technological advances for ultra-high-frequency screening that now can dramatically reduce the timescale of engineering projects. We discuss practical issues of scope, scalability, sensitivity and stereoselectivity for the improvement of biotechnologically relevant enzymes from different classes.
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8
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Dixon C, Lamanna J, Wheeler AR. Direct loading of blood for plasma separation and diagnostic assays on a digital microfluidic device. LAB ON A CHIP 2020; 20:1845-1855. [PMID: 32338260 DOI: 10.1039/d0lc00302f] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Finger-stick blood sampling is convenient for point of care diagnostics, but whole blood samples are problematic for many assays because of severe matrix effects associated with blood cells and cell debris. We introduce a new digital microfluidic (DMF) diagnostic platform with integrated porous membranes for blood-plasma separation from finger-stick blood volumes, capable of performing complex, multi-step, diagnostic assays. Importantly, the samples can be directly loaded onto the device by a finger "dab" for user-friendly operation. We characterize the platform by comparison to plasma generated via the "gold standard" centrifugation technique, and demonstrate a 21-step rubella virus (RV) IgG immunoassay yielding a detection limit of 1.9 IU mL-1, below the diagnostic cut-off. We propose that this work represents a critical next step in DMF based portable diagnostic assays-allowing the analysis of whole blood samples without pre-processing.
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Affiliation(s)
- Christopher Dixon
- Department of Chemistry, University of Toronto, 80. St. George Street, Toronto, Ontario M5S 3H6, Canada.
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9
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Nuchtavorn N, Leanpolchareanchai J, Suntornsuk L, Macka M. Paper-based sol-gel thin films immobilized cytochrome P450 for enzyme activity measurement. Anal Chim Acta 2020; 1098:86-93. [DOI: 10.1016/j.aca.2019.11.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/28/2019] [Accepted: 11/05/2019] [Indexed: 12/18/2022]
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10
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Loo JFC, Ho AHP, Turner APF, Mak WC. Integrated Printed Microfluidic Biosensors. Trends Biotechnol 2019; 37:1104-1120. [PMID: 30992149 DOI: 10.1016/j.tibtech.2019.03.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 03/07/2019] [Accepted: 03/07/2019] [Indexed: 02/07/2023]
Abstract
Integrated printed microfluidic biosensors are one of the most recent point-of-care (POC) sensor developments. Fast turnaround time for production and ease of customization, enabled by the integration of recognition elements and transducers, are key for on-site biosensing for both healthcare and industry and for speeding up translation to real-life applications. Here, we provide an overview of recent progress in printed microfluidics, from the 2D to the 4D level, accompanied by novel sensing element integration. We also explore the latest trends in integrated printed microfluidics for healthcare, especially POC diagnostics, and food safety applications.
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Affiliation(s)
- Jacky F C Loo
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong Special Administrative Region
| | - Aaron H P Ho
- Department of Biomedical Engineering, The Chinese University of Hong Kong, Hong Kong Special Administrative Region
| | | | - Wing Cheung Mak
- Biosensors and Bioelectronics Centre, Department of Physics, Chemistry and Biology (IFM), Linköping University, 58183, Linköping, Sweden.
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Zhang J, Chen J, Peng S, Peng S, Zhang Z, Tong Y, Miller PW, Yan XP. Emerging porous materials in confined spaces: from chromatographic applications to flow chemistry. Chem Soc Rev 2019; 48:2566-2595. [DOI: 10.1039/c8cs00657a] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Porous materials confined within capillary columns/microfluidic devices are discussed, and progress in chromatographic and membrane separations and catalysis is reviewed.
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Affiliation(s)
- Jianyong Zhang
- Sun Yat-Sen University
- MOE Laboratory of Polymeric Composite and Functional Materials
- Guangzhou 510275
- China
| | - Junxing Chen
- Sun Yat-Sen University
- MOE Laboratory of Polymeric Composite and Functional Materials
- Guangzhou 510275
- China
| | - Sheng Peng
- Sun Yat-Sen University
- MOE Laboratory of Polymeric Composite and Functional Materials
- Guangzhou 510275
- China
| | - Shuyin Peng
- Sun Yat-Sen University
- MOE Laboratory of Polymeric Composite and Functional Materials
- Guangzhou 510275
- China
| | - Zizhe Zhang
- Sun Yat-Sen University
- MOE Laboratory of Polymeric Composite and Functional Materials
- Guangzhou 510275
- China
| | - Yexiang Tong
- Sun Yat-Sen University
- MOE Laboratory of Polymeric Composite and Functional Materials
- Guangzhou 510275
- China
| | | | - Xiu-Ping Yan
- State Key Laboratory of Food Science and Technology
- International Joint Laboratory on Food Safety
- School of Food Science and Technology
- Jiangnan University
- Wuxi 214122
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Sathyanarayanan G, Haapala M, Sikanen T. Interfacing Digital Microfluidics with Ambient Mass Spectrometry Using SU-8 as Dielectric Layer. MICROMACHINES 2018; 9:E649. [PMID: 30544772 PMCID: PMC6316065 DOI: 10.3390/mi9120649] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 11/27/2018] [Accepted: 12/06/2018] [Indexed: 01/20/2023]
Abstract
This work describes the interfacing of electrowetting-on-dielectric based digital microfluidic (DMF) sample preparation devices with ambient mass spectrometry (MS) via desorption atmospheric pressure photoionization (DAPPI). The DMF droplet manipulation technique was adopted to facilitate drug distribution and metabolism assays in droplet scale, while ambient mass spectrometry (MS) was exploited for the analysis of dried samples directly on the surface of the DMF device. Although ambient MS is well-established for bio- and forensic analyses directly on surfaces, its interfacing with DMF is scarce and requires careful optimization of the surface-sensitive processes, such as sample precipitation and the subsequent desorption/ionization. These technical challenges were addressed and resolved in this study by making use of the high mechanical, thermal, and chemical stability of SU-8. In our assay design, SU-8 served as the dielectric layer for DMF as well as the substrate material for DAPPI-MS. The feasibility of SU-8 based DMF devices for DAPPI-MS was demonstrated in the analysis of selected pharmaceuticals following on-chip liquid-liquid extraction or an enzymatic dealkylation reaction. The lower limits of detection were in the range of 1⁻10 pmol per droplet (0.25⁻1.0 µg/mL) for all pharmaceuticals tested.
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Affiliation(s)
- Gowtham Sathyanarayanan
- Drug Research Program, Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Viikinkaari 5E, 00790 Helsinki, Finland.
| | - Markus Haapala
- Drug Research Program, Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Viikinkaari 5E, 00790 Helsinki, Finland.
| | - Tiina Sikanen
- Drug Research Program, Faculty of Pharmacy, Division of Pharmaceutical Chemistry and Technology, University of Helsinki, Viikinkaari 5E, 00790 Helsinki, Finland.
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