1
|
Liu Y, Cao Q, Xu H, Lin G. Flow tweezing of anisotropic magnetic microrobots in a dynamic magnetic trap for active retention and localized flow sensing. LAB ON A CHIP 2024. [PMID: 39118487 DOI: 10.1039/d4lc00474d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
Controlled manipulation of microscale robotic devices in complex fluidic networks is critical for various applications in biomedical endovascular sensing, lab-on-chip biochemical assays, and environmental monitoring. However, achieving controlled transport and active retention of microscale robots with flow sensing capability has proven to be challenging. Here, we report the dynamic tweezing of an anisotropic magnetic microrobot in a rotating magnetic trap for active retention and localized flow sensing under confined fluidic conditions. We reveal a series of unconventional motion modes and the dynamics of the microrobot transporting in a confined fluidic flow, which manifest themselves as transitions from on-trap centre rolling to large-area revolution and off-trap centre rolling with varying rotating frequencies. By retaining the robot within the magnetic trap and its motion modulated by the field frequency, the off-centre rolling of the microrobot endows it with crucial localized flow sensing capabilities, including flow rate and flow direction determination. The magnetic microrobot serves as a mobile platform for measuring the flow profile along a curved channel, mimicking a blood vessel. Our findings unlock a new strategy to determine the local magnetic tweezing force profile and flow conditions in arbitrary flow channels, revealing strong potential for microfluidics, chemical reactors, and in vivo endovascular flow measurement.
Collapse
Affiliation(s)
- Yuan Liu
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, Guangdong Province, P. R. China.
| | - Quanliang Cao
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, 430074, China
- State Key Laboratory of Advanced Electromagnetic Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Haifeng Xu
- Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen 518055, Guangdong Province, P. R. China.
| | - Gungun Lin
- Institute for Biomedical Materials and Devices, School of Mathematical and Physical Sciences, Faculty of Science, University of Technology Sydney, 15 Broadway, Ultimo, NSW 2007, Australia.
| |
Collapse
|
2
|
Fitzgerald S, O'Shea DF. Continuous Flow Bioconjugations of NIR‐AZA Fluorophores via Strained Alkyne Cycloadditions with Intra‐Chip Fluorogenic Monitoring**. Chemistry 2022; 28:e202104111. [PMID: 34979050 PMCID: PMC9305252 DOI: 10.1002/chem.202104111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Indexed: 11/17/2022]
Abstract
The importance of bioconjugation reactions continues to grow for cell specific targeting and dual therapeutic plus diagnostic medical applications. This necessitates the development of new bioconjugation chemistries, in‐flow synthetic and analytical methods. With this goal, continuous flow bioconjugations were readily achieved with short residence times for strained alkyne substituted carbohydrate and therapeutic peptide biomolecules in reaction with azide and tetrazine substituted fluorophores. The strained alkyne substrates included substituted 2‐amino‐2‐deoxy‐α‐D‐glucopyranose, and the linear and cyclic peptide sequences QIRQQPRDPPTETLELEVSPDPAS‐OH and c(RGDfK) respectively. The catalyst and reagent‐free inverse electron demand tetrazine cycloadditions proved more favourable than the azide 1,3‐dipolar cycloadditions. Reaction completion was achieved with residence times of 5 min at 40 °C for tetrazine versus 10 min at 80 °C for azide cycloadditions. The use of a fluorogenic tetrazine fluorophore, in a glass channelled reactor chip, allowed for intra‐chip reaction monitoring by recording fluorescence intensities at various positions throughout the chip. As the Diels‐Alder reactions proceeded through the chip, the fluorescence intensity increased accordingly in real‐time. The application of continuous flow fluorogenic bioconjugations could offer an efficient translational access to theranostic agents.
Collapse
Affiliation(s)
| | - Donal F. O'Shea
- Chemistry Department, RCSI 123 St. Stephen's Green Dublin 2 Ireland
| |
Collapse
|
3
|
Azimzadeh M, Khashayar P, Amereh M, Tasnim N, Hoorfar M, Akbari M. Microfluidic-Based Oxygen (O 2) Sensors for On-Chip Monitoring of Cell, Tissue and Organ Metabolism. BIOSENSORS 2021; 12:bios12010006. [PMID: 35049634 PMCID: PMC8774018 DOI: 10.3390/bios12010006] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/14/2021] [Accepted: 12/14/2021] [Indexed: 05/08/2023]
Abstract
Oxygen (O2) quantification is essential for assessing cell metabolism, and its consumption in cell culture is an important indicator of cell viability. Recent advances in microfluidics have made O2 sensing a crucial feature for organ-on-chip (OOC) devices for various biomedical applications. OOC O2 sensors can be categorized, based on their transducer type, into two main groups, optical and electrochemical. In this review, we provide an overview of on-chip O2 sensors integrated with the OOC devices and evaluate their advantages and disadvantages. Recent innovations in optical O2 sensors integrated with OOCs are discussed in four main categories: (i) basic luminescence-based sensors; (ii) microparticle-based sensors; (iii) nano-enabled sensors; and (iv) commercial probes and portable devices. Furthermore, we discuss recent advancements in electrochemical sensors in five main categories: (i) novel configurations in Clark-type sensors; (ii) novel materials (e.g., polymers, O2 scavenging and passivation materials); (iii) nano-enabled electrochemical sensors; (iv) novel designs and fabrication techniques; and (v) commercial and portable electrochemical readouts. Together, this review provides a comprehensive overview of the current advances in the design, fabrication and application of optical and electrochemical O2 sensors.
Collapse
Affiliation(s)
- Mostafa Azimzadeh
- Medical Nanotechnology & Tissue Engineering Research Center, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd 89195-999, Iran;
- Stem Cell Biology Research Center, Yazd Reproductive Sciences Institute, Shahid Sadoughi University of Medical Sciences, Yazd 89195-999, Iran
- Department of Medical Biotechnology, School of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd 89165-887, Iran
| | - Patricia Khashayar
- Center for Microsystems Technology, Imec and Ghent University, 9050 Ghent, Belgium;
| | - Meitham Amereh
- Laboratory for Innovations in Micro Engineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada;
- Center for Advanced Materials and Related Technologies, University of Victoria, Victoria, BC V8P 5C2, Canada
- Department of Mechanical Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada;
| | - Nishat Tasnim
- Department of Mechanical Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada;
| | - Mina Hoorfar
- Department of Mechanical Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada;
- Correspondence: (M.H.); (M.A.)
| | - Mohsen Akbari
- Laboratory for Innovations in Micro Engineering (LiME), Department of Mechanical Engineering, University of Victoria, Victoria, BC V8P 5C2, Canada;
- Center for Advanced Materials and Related Technologies, University of Victoria, Victoria, BC V8P 5C2, Canada
- Biotechnology Center, Silesian University of Technology, Akademicka 2A, 44-100 Gliwice, Poland
- Correspondence: (M.H.); (M.A.)
| |
Collapse
|
4
|
Rivera KR, Yokus MA, Erb PD, Pozdin VA, Daniele M. Measuring and regulating oxygen levels in microphysiological systems: design, material, and sensor considerations. Analyst 2019; 144:3190-3215. [PMID: 30968094 PMCID: PMC6564678 DOI: 10.1039/c8an02201a] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
As microfabrication techniques and tissue engineering methods improve, microphysiological systems (MPS) are being engineered that recapitulate complex physiological and pathophysiological states to supplement and challenge traditional animal models. Although MPS provide unique microenvironments that transcend common 2D cell culture, without proper regulation of oxygen content, MPS often fail to provide the biomimetic environment necessary to activate and investigate fundamental pathways of cellular metabolism and sub-cellular level. Oxygen exists in the human body in various concentrations and partial pressures; moreover, it fluctuates dramatically depending on fasting, exercise, and sleep patterns. Regulating oxygen content inside MPS necessitates a sensitive biological sensor to quantify oxygen content in real-time. Measuring oxygen in a microdevice is a non-trivial requirement for studies focused on understanding how oxygen impacts cellular processes, including angiogenesis and tumorigenesis. Quantifying oxygen inside a microdevice can be achieved via an array of technologies, with each method having benefits and limitations in terms of sensitivity, limits of detection, and invasiveness that must be considered and optimized. This article will review oxygen physiology in organ systems and offer comparisons of organ-specific MPS that do and do not consider oxygen microenvironments. Materials used in microphysiological models will also be analyzed in terms of their ability to control oxygen. Finally, oxygen sensor technologies are critically compared and evaluated for use in MPS.
Collapse
Affiliation(s)
- Kristina R Rivera
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, 911 Oval Dr., Raleigh, NC 27695, USA.
| | | | | | | | | |
Collapse
|
5
|
Maddipatla D, Narakathu BB, Ochoa M, Rahimi R, Zhou J, Yoon CK, Jiang H, Al-Zubaidi H, Obare SO, Zieger MA, Ziaie B, Atashbar MZ. Rapid prototyping of a novel and flexible paper based oxygen sensing patch via additive inkjet printing process. RSC Adv 2019; 9:22695-22704. [PMID: 35519443 PMCID: PMC9067098 DOI: 10.1039/c9ra02883h] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 07/18/2019] [Indexed: 11/21/2022] Open
Abstract
A novel and flexible oxygen sensing patch was successfully developed for wearable, industrial, food packaging, pharmaceutical and biomedical applications using a cost-efficient and rapid prototypable additive inkjet print manufacturing process. An oxygen sensitive ink was formulated by dissolving ruthenium dye and ethyl cellulose polymer in ethanol in a 1 : 1 : 98 (w/w/w) ratio. The patch was fabricated by depositing the oxygen sensitive ink on a flexible parchment paper substrate using an inkjet printing process. A maximum absorbance from 430 nm to 480 nm and a fluorescence of 600 nm was observed for the oxygen sensitive ink. The capability of the oxygen sensitive patch was investigated by measuring the fluorescence quenching lifetime of the printed dye for varying oxygen concentration levels. A fluorescence lifetime decay (τ) from ≈4 μs to ≈1.9 μs was calculated for the printed oxygen sensor patch, for oxygen concentrations varying from ≈5 mg L−1 to ≈25 mg L−1. A sensitivity of 0.11 μs mg L−1 and a correlation coefficient of 0.9315 was measured for the printed patches. The results demonstrated the feasibility of employing an inkjet printing process for the rapid prototyping of flexible and moisture resistant oxygen sensitive patches which facilitates a non-invasive method for monitoring oxygen and its concentration levels. A paper-based low cost and rapid prototypable flexible oxygen sensing patch was developed for the first time using a cost-efficient additive inkjet print manufacturing process for wearable, food packaging, pharmaceutical and biomedical applications.![]()
Collapse
Affiliation(s)
- Dinesh Maddipatla
- Department of Electrical and Computer Engineering
- Western Michigan University
- USA
| | - Binu B. Narakathu
- Department of Electrical and Computer Engineering
- Western Michigan University
- USA
| | - Manuel Ochoa
- School of Electrical and Computer Engineering
- Purdue University
- USA
| | - Rahim Rahimi
- School of Electrical and Computer Engineering
- Purdue University
- USA
| | - Jiawei Zhou
- School of Electrical and Computer Engineering
- Purdue University
- USA
| | - Chang K. Yoon
- School of Electrical and Computer Engineering
- Purdue University
- USA
| | - Hongjie Jiang
- School of Electrical and Computer Engineering
- Purdue University
- USA
| | | | | | | | - Babak Ziaie
- School of Electrical and Computer Engineering
- Purdue University
- USA
| | - Massood Z. Atashbar
- Department of Electrical and Computer Engineering
- Western Michigan University
- USA
| |
Collapse
|
6
|
Nemati SH, Liyu DA, Canul AJ, Vasdekis AE. Solvent immersion imprint lithography: A high-performance, semi-automated procedure. BIOMICROFLUIDICS 2017; 11:024111. [PMID: 28798847 PMCID: PMC5533493 DOI: 10.1063/1.4979575] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Accepted: 03/20/2017] [Indexed: 06/07/2023]
Abstract
We expand upon our recent, fundamental report on solvent immersion imprint lithography (SIIL) and describe a semi-automated and high-performance procedure for prototyping polymer microfluidics and optofluidics. The SIIL procedure minimizes manual intervention through a cost-effective (∼$200) and easy-to-assemble apparatus. We analyze the procedure's performance specifically for Poly (methyl methacrylate) microsystems and report repeatable polymer imprinting, bonding, and 3D functionalization in less than 5 min, down to 8 μm resolutions and 1:1 aspect ratios. In comparison to commercial approaches, the modified SIIL procedure enables substantial cost reductions, a 100-fold reduction in imprinting force requirements, as well as a more than 10-fold increase in bonding strength. We attribute these advantages to the directed polymer dissolution that strictly localizes at the polymer-solvent interface, as uniquely offered by SIIL. The described procedure opens new desktop prototyping opportunities, particularly for non-expert users performing live-cell imaging, flow-through catalysis, and on-chip gas detection.
Collapse
Affiliation(s)
- S H Nemati
- Department of Physics, University of Idaho, Moscow, Idaho 83844, USA
| | - D A Liyu
- Department of Physics, University of Idaho, Moscow, Idaho 83844, USA
| | - A J Canul
- Department of Physics, University of Idaho, Moscow, Idaho 83844, USA
| | - A E Vasdekis
- Department of Physics, University of Idaho, Moscow, Idaho 83844, USA
| |
Collapse
|
7
|
Mao Y, Zhao Q, Pan T, Shi J, Jiang S, Chen M, Zhou B, Tian Y. Platinum porphyrin/3-(trimethoxysily)propylmethacrylate functionalized flexible PDMS micropillar arrays as optical oxygen sensors. NEW J CHEM 2017. [DOI: 10.1039/c7nj01187c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A PtTPP/TPMA functionalized PDMS-based micropillar array film was presented as a flexible optical oxygen sensor with efficiently improved sensing capabilities.
Collapse
Affiliation(s)
- Yongyun Mao
- Institute of Applied Physics and Materials Engineering
- University of Macau
- Avenida da Universidade
- Taipa
- China
| | - Qian Zhao
- Department of Materials Science and Engineering
- South University of Science and Technology of China
- Shenzhen
- China
- Key Laboratory of Supramolecular Structure and Materials
| | - Tingting Pan
- Department of Materials Science and Engineering
- South University of Science and Technology of China
- Shenzhen
- China
- State Key Laboratory of Quality Research in Chinese Medicine
| | - Jiayan Shi
- Department of Materials Science and Engineering
- South University of Science and Technology of China
- Shenzhen
- China
| | - Shimei Jiang
- Key Laboratory of Supramolecular Structure and Materials
- Jilin University
- Changchun 130012
- P. R. China
| | - Meiwan Chen
- State Key Laboratory of Quality Research in Chinese Medicine
- Institute of Chinese Medical Sciences
- University of Macau
- Avenida da Universidade
- Taipa
| | - Bingpu Zhou
- Institute of Applied Physics and Materials Engineering
- University of Macau
- Avenida da Universidade
- Taipa
- China
| | - Yanqing Tian
- Department of Materials Science and Engineering
- South University of Science and Technology of China
- Shenzhen
- China
| |
Collapse
|
8
|
Moore JS, Xantheas SS, Grate JW, Wietsma TW, Gratton E, Vasdekis AE. Modular Polymer Biosensors by Solvent Immersion Imprint Lithography. ACTA ACUST UNITED AC 2015; 54:98-103. [PMID: 27867256 DOI: 10.1002/polb.23961] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We recently demonstrated Solvent Immersion Imprint Lithography (SIIL), a rapid benchtop microsystem prototyping technique, including polymer functionalization, imprinting and bonding. Here, we focus on the realization of planar polymer sensors using SIIL through simple solvent immersion without imprinting. We describe SIIL's impregnation characteristics, including an inherent mechanism that not only achieves practical doping concentrations, but their unexpected 2-fold enhancement compared to the immersion solution. Subsequently, we developed and characterized optical sensors for detecting molecular O2. To this end, a substantially high dynamic range is reported, including its control through the immersion duration, a manifestation of SIIL's modularity. Overall, SIIL exhibits the potential of improving the operating characteristics of polymer sensors, while significantly accelerating their prototyping, as it requires a few seconds of processing and no need for substrates or dedicated instrumentation. These are critical for O2 sensing as probed by way of example here, as well as any polymer permeable reactant.
Collapse
Affiliation(s)
- J S Moore
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - S S Xantheas
- Physical Sciences Division, Pacific Northwest National Laboratory, PO Box 999, Richland, WA, 99352, USA
| | - J W Grate
- Physical Sciences Division, Pacific Northwest National Laboratory, PO Box 999, Richland, WA, 99352, USA
| | - T W Wietsma
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - E Gratton
- Laboratory of Fluorescence Dynamics, Biomedical Engineering Department, University of California, Irvine, CA 92697, USA
| | - A E Vasdekis
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, USA.; Department of Physics, University of Idaho, Moscow, ID, 83844, USA
| |
Collapse
|
9
|
Meier TA, Poehler E, Kemper F, Pabst O, Jahnke HG, Beckert E, Robitzki A, Belder D. Fast electrically assisted regeneration of on-chip SERS substrates. LAB ON A CHIP 2015; 15:2923-7. [PMID: 26040796 DOI: 10.1039/c5lc00397k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
A microfluidic chip approach utilising integrated electrically connected stationary SERS targets based on inkjet-printed silver nanoparticles is presented. It enables multiple interference-free consecutive surface-enhanced Raman measurements inside chip channels by electrically assisted regeneration of the stationary SERS substrate. Thereby it circumvents common adsorption and memory effect problems associated with stationary SERS targets allowing multiple consecutive measurements in a continuous-flow system.
Collapse
Affiliation(s)
- T-A Meier
- Institut für Analytische Chemie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Pfeiffer SA, Nagl S. Microfluidic platforms employing integrated fluorescent or luminescent chemical sensors: a review of methods, scope and applications. Methods Appl Fluoresc 2015; 3:034003. [DOI: 10.1088/2050-6120/3/3/034003] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
11
|
Sun S, Ungerböck B, Mayr T. Imaging of oxygen in microreactors and microfluidic systems. Methods Appl Fluoresc 2015; 3:034002. [DOI: 10.1088/2050-6120/3/3/034002] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
|
12
|
Poehler E, Herzog C, Suendermann M, Pfeiffer SA, Nagl S. Development of microscopic time-domain dual lifetime referencing luminescence detection for pH monitoring in microfluidic free-flow isoelectric focusing. Eng Life Sci 2015. [DOI: 10.1002/elsc.201400081] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Elisabeth Poehler
- Institut für Analytische Chemie; Universität Leipzig; Leipzig Germany
| | - Christin Herzog
- Institut für Analytische Chemie; Universität Leipzig; Leipzig Germany
| | | | - Simon A. Pfeiffer
- Institut für Analytische Chemie; Universität Leipzig; Leipzig Germany
| | - Stefan Nagl
- Institut für Analytische Chemie; Universität Leipzig; Leipzig Germany
| |
Collapse
|
13
|
Lasave LC, Borisov SM, Ehgartner J, Mayr T. Quick and simple integration of optical oxygen sensors into glass-based microfluidic devices. RSC Adv 2015. [DOI: 10.1039/c5ra15591f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel simple and inexpensive technique for integration of optical oxygen sensors into microfluidic channels made of glass. The channels are coated with conjugated polymeric nanoparticles containing a covalently grafted oxygen indicator.
Collapse
Affiliation(s)
- Liliana C. Lasave
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz
- Austria
| | - Sergey M. Borisov
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz
- Austria
| | - Josef Ehgartner
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz
- Austria
| | - Torsten Mayr
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz
- Austria
| |
Collapse
|
14
|
Meier TA, Beulig RJ, Klinge E, Fuss M, Ohla S, Belder D. On-chip monitoring of chemical syntheses in microdroplets via surface-enhanced Raman spectroscopy. Chem Commun (Camb) 2015; 51:8588-91. [DOI: 10.1039/c4cc09595b] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
An approach for inline monitoring of organic syntheses in a microfluidic droplet chip via surface-enhanced Raman spectroscopy is presented. In a proof of concept it was successfully applied to follow thiazole syntheses in real-time.
Collapse
Affiliation(s)
- T.-A. Meier
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - R. J. Beulig
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - E. Klinge
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - M. Fuss
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - S. Ohla
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| | - D. Belder
- Institut für Analytische Chemie
- Universität Leipzig
- D-04103 Leipzig
- Germany
| |
Collapse
|
15
|
Hoera C, Ohla S, Shu Z, Beckert E, Nagl S, Belder D. An integrated microfluidic chip enabling control and spatially resolved monitoring of temperature in micro flow reactors. Anal Bioanal Chem 2014; 407:387-96. [DOI: 10.1007/s00216-014-8297-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 10/18/2014] [Accepted: 10/21/2014] [Indexed: 12/30/2022]
|
16
|
Culbertson CT, Mickleburgh TG, Stewart-James SA, Sellens KA, Pressnall M. Micro total analysis systems: fundamental advances and biological applications. Anal Chem 2014; 86:95-118. [PMID: 24274655 PMCID: PMC3951881 DOI: 10.1021/ac403688g] [Citation(s) in RCA: 106] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Tom G. Mickleburgh
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA
| | | | - Kathleen A. Sellens
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA
| | - Melissa Pressnall
- Department of Chemistry, Kansas State University, Manhattan, Kansas 66506, USA
| |
Collapse
|
17
|
Ungerböck B, Fellinger S, Sulzer P, Abel T, Mayr T. Magnetic optical sensor particles: a flexible analytical tool for microfluidic devices. Analyst 2014; 139:2551-9. [DOI: 10.1039/c4an00169a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetic optical sensor particles are used to generate in situ sensor spots within microfluidic channels and serve as flexible analytical tools.
Collapse
Affiliation(s)
- Birgit Ungerböck
- Applied Sensors
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz, Austria
| | - Siegfried Fellinger
- Applied Sensors
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz, Austria
| | - Philipp Sulzer
- Applied Sensors
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz, Austria
| | - Tobias Abel
- Applied Sensors
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz, Austria
| | - Torsten Mayr
- Applied Sensors
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- 8010 Graz, Austria
| |
Collapse
|
18
|
Ehgartner J, Wiltsche H, Borisov SM, Mayr T. Low cost referenced luminescent imaging of oxygen and pH with a 2-CCD colour near infrared camera. Analyst 2014; 139:4924-33. [DOI: 10.1039/c4an00783b] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A low cost imaging set-up for NIR-emitting optical chemical sensors for pH and oxygen based on a 2-CCD camera is presented.
Collapse
Affiliation(s)
- Josef Ehgartner
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- Graz, Austria
| | - Helmar Wiltsche
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- Graz, Austria
| | - Sergey M. Borisov
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- Graz, Austria
| | - Torsten Mayr
- Institute of Analytical Chemistry and Food Chemistry
- Graz University of Technology
- Graz, Austria
| |
Collapse
|
19
|
|