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Andreasen SZ, Sanger K, Jendresen CB, Nielsen AT, Emnéus J, Boisen A, Zór K. Extraction, Enrichment, and in situ Electrochemical Detection on Lab-on-a-Disc: Monitoring the Production of a Bacterial Secondary Metabolite. ACS Sens 2019; 4:398-405. [PMID: 30525464 DOI: 10.1021/acssensors.8b01277] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Development of microsystems, which enable "sample-to-answer" detection from real samples, is often challenging. We present the first integration of supported liquid membrane extraction combined with electrochemical detection on a centrifugal fluidic platform. The developed lab-on-a-disc (LoD) system enabled the separation, enrichment, and subsequent electrochemical detection of the target analyte from a complex sample mixture. As a case study, we quantified the amount of a dietary supplement and pharmaceutical precursor, p-coumaric acid, from bacterial growth media at different time points during production. The assay, extraction, and detection, performed on the LoD device, proved to be a low cost and environmentally friendly approach, requiring only a few tens of microliters of organic solvent and enabled detection in a 3 μL volume. In addition, the data obtained from the centrifugal platform showed a good correlation with data obtained from the high performance liquid chromatography analysis.
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Affiliation(s)
- Sune Zoëga Andreasen
- Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Kuldeep Sanger
- Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Christian Bille Jendresen
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2970 Hørsholm, Denmark
| | - Alex Toftgaard Nielsen
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2970 Hørsholm, Denmark
| | - Jenny Emnéus
- Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Anja Boisen
- Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
| | - Kinga Zór
- Department of Micro- and Nanotechnology, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
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Viehrig M, Thilsted AH, Matteucci M, Wu K, Catak D, Schmidt MS, Zór K, Boisen A. Injection-Molded Microfluidic Device for SERS Sensing Using Embedded Au-Capped Polymer Nanocones. ACS APPLIED MATERIALS & INTERFACES 2018; 10:37417-37425. [PMID: 30277378 DOI: 10.1021/acsami.8b13424] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
To enable affordable detection and diagnostic, there is a need for low-cost and mass producible miniaturized sensing platforms. We present a fully polymeric microfluidic lab-on-a-chip device with integrated gold (Au)-capped nanocones for sensing applications based on surface-enhanced Raman spectroscopy (SERS). All base components of the device were fabricated via injection molding (IM) and can be easily integrated using ultrasonic welding. The SERS sensor array, embedded in the bottom of a fluidic channel, was created by evaporating Au onto IM nanocone structures, resulting in densely packed Au-capped SERS active nanostructures. Using a Raman active model analyte, trans-1,2-bis-(4-pyridyl)-ethylene, we found a surface-averaged SERS enhancement factor of ∼5 × 106 with a relative standard deviation of 14% over the sensor area (2 × 2 mm2), and a 18% signal variation among substrates. This reproducible fabrication method is cost-effective, less time consuming, and allows mass production of fully integrated polymeric, microfluidic systems with embedded high-density and high-aspect ratio SERS sensor.
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Affiliation(s)
- Marlitt Viehrig
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
| | - Anil H Thilsted
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
| | - Marco Matteucci
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
| | - Kaiyu Wu
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
| | - Darmin Catak
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
| | - Michael S Schmidt
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
| | - Kinga Zór
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
| | - Anja Boisen
- The Danish National Research Foundation and Villum Foundation's Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Micro- and Nanotechnology , Technical University of Denmark , Ørsted Plads , 2800 Kgs. Lyngby , Denmark
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Miled A, Greener J. Recent Advancements towards Full-System Microfluidics. SENSORS (BASEL, SWITZERLAND) 2017; 17:E1707. [PMID: 28757587 PMCID: PMC5579583 DOI: 10.3390/s17081707] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 07/22/2017] [Accepted: 07/22/2017] [Indexed: 02/07/2023]
Abstract
Microfluidics is quickly becoming a key technology in an expanding range of fields, such as medical sciences, biosensing, bioactuation, chemical synthesis, and more. This is helping its transformation from a promising R&D tool to commercially viable technology. Fuelling this expansion is the intensified focus on automation and enhanced functionality through integration of complex electrical control, mechanical properties, in situ sensing and flow control. Here we highlight recent contributions to the Sensors Special Issue series called "Microfluidics-Based Microsystem Integration Research" under the following categories: (i) Device fabrication to support complex functionality; (ii) New methods for flow control and mixing; (iii) Towards routine analysis and point of care applications; (iv) In situ characterization; and (v) Plug and play microfluidics.
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Affiliation(s)
- Amine Miled
- Electrical and Computer Engineering Department, Faculty of Sciences and Engineering, Université Laval, Quebec City, QC G1V 0A6, Canada.
| | - Jesse Greener
- Department of Chemistry, Faculty of Sciences and Engineering, Université Laval, Quebec City, QC G1V 0A6, Canada.
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Bashirzadeh Y, Maruthamuthu V, Qian S. Electrokinetic Phenomena in Pencil Lead-Based Microfluidics. MICROMACHINES 2016; 7:E235. [PMID: 30404407 PMCID: PMC6190385 DOI: 10.3390/mi7120235] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Revised: 12/09/2016] [Accepted: 12/12/2016] [Indexed: 01/05/2023]
Abstract
Fabrication of microchannels and associated electrodes to generate electrokinetic phenomena often involves costly materials and considerable effort. In this study, we used graphite pencil-leads as low cost, disposable 3D electrodes to investigate various electrokinetic phenomena in straight cylindrical microchannels, which were themselves fabricated by using a graphite rod as the microchannel mold. Individual pencil-leads were employed as the micro-electrodes arranged along the side walls of the microchannel. Efficient electrokinetic phenomena provided by the 3D electrodes, including alternating current electroosmosis (ACEO), induced-charge electroosmosis (ICEO), and dielectrophoresis (DEP), were demonstrated by the introduced pencil-lead based microfluidic devices. The electrokinetic phenomena were characterized by micro-particle image velocimetry (micro-PIV) measurements and microscopy imaging. Highly efficient electrokinetic phenomena using 3D pencil-lead electrodes showed the affordability and ease of this technique to fabricate microfluidic devices embedded with electrodes for electrokinetic fluid and particle manipulations.
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Affiliation(s)
- Yashar Bashirzadeh
- Department of Mechanical & Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA.
| | - Venkat Maruthamuthu
- Department of Mechanical & Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA.
| | - Shizhi Qian
- Department of Mechanical & Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA.
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