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Liu Y, Wu T, Wu Q, Chen W, Ye C, Wang M, He X. A Laser-Locked Hollow Waveguide Gas Sensor for Simultaneous Measurements of CO 2 Isotopologues with High Accuracy, Precision, and Sensitivity. Anal Chem 2021; 93:15468-15473. [PMID: 34766749 DOI: 10.1021/acs.analchem.1c03482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A laser frequency-locked hollow waveguide (HWG) gas sensor is demonstrated for simultaneous measurements of three isotopologues (12CO2, 13CO2, and 18OC16O) using wavelength modulation spectroscopy with a 2.73 μm distributed feedback laser. The first harmonic (1f) signal at the sampling point where the peak of the second harmonic (2f) signal was located was employed as the locking point to lock the laser frequency to the transition center of 13CO2, while the absorption lines of 12CO2 and 18OC16O were being scanned. Continuous measurements of the three isotopologues of 4.7% CO2 samples over 103 min under free running and frequency locking conditions were performed. The measurement accuracy and precision of the three isotopologues achieved under the frequency locking condition were at least 3 times and 1.3 times better than those obtained under the free running condition, respectively. The Allan variance plot of the developed laser-locked HWG gas sensor shows a detection limit of 0.72‰ for both δ13C and δ18O under the frequency locking condition with a long stability time of 766 s. This study demonstrated the high potential of a novel human breath diagnostic sensor for medical diagnostic with high accuracy, precision, and sensitivity and without frequently repeated calibration.
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Affiliation(s)
- Yang Liu
- Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
| | - Tao Wu
- Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
| | - Qiang Wu
- Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China.,Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle upon Tyne NE1 8ST, U.K
| | - Weidong Chen
- Laboratoire de Physicochimie de l'Atmosphère, Université du Littoral Côte d'Opale, 189A, Av. Maurice Schumann, Dunkerque 59140, France
| | - Chenwen Ye
- Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
| | - Mengyu Wang
- Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
| | - Xingdao He
- Key Laboratory of Nondestructive Test (Ministry of Education), Nanchang Hangkong University, Nanchang 330063, China
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2
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Glöckler J, Jaeschke C, Kocaöz Y, Kokoric V, Tütüncü E, Mitrovics J, Mizaikoff B. iHWG-MOX: A Hybrid Breath Analysis System via the Combination of Substrate-Integrated Hollow Waveguide Infrared Spectroscopy with Metal Oxide Gas Sensors. ACS Sens 2020; 5:1033-1039. [PMID: 32189494 DOI: 10.1021/acssensors.9b02554] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
According to their materials and operating parameters, metal oxide (MOX) sensors respond to target gases only by a change in sensor resistance with a lack in selectivity. By the use of infrared spectroscopy, highly discriminatory information from samples at a molecular level can be obtained and the selectivity can be enhanced. A low-volume gas cell was developed for a commercially available semiconducting MOX methane gas sensor and coupled directly to a mid-infrared gas sensor based on substrate-integrated hollow waveguide (iHWG) technology combined with a Fourier transform infrared spectrometer. This study demonstrates a sensing process with combined orthogonal sensors for fast, time-resolved, and synergic detection of methane and carbon dioxide in gas samples.
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Affiliation(s)
- Johannes Glöckler
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Carsten Jaeschke
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
- JLM Innovation GmbH, Vor dem Kreuzberg 17, 72070 Tübingen, Germany
| | - Yusuf Kocaöz
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Vjekoslav Kokoric
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Erhan Tütüncü
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Jan Mitrovics
- JLM Innovation GmbH, Vor dem Kreuzberg 17, 72070 Tübingen, Germany
| | - Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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3
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Zhou T, Wu T, Wu Q, Ye C, Hu R, Chen W, He X. Real-time measurement of CO 2 isotopologue ratios in exhaled breath by a hollow waveguide based mid-infrared gas sensor. OPTICS EXPRESS 2020; 28:10970-10980. [PMID: 32403618 DOI: 10.1364/oe.385103] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 03/05/2020] [Indexed: 06/11/2023]
Abstract
A hollow waveguide (HWG) based mid-infrared gas sensor using a 2.73 µm distributed feedback (DFB) laser was developed for simultaneously measuring the concentration changes of the three isotopologues 13CO2, 12CO2, and 18OC16O in exhaled breath by direct absorption spectroscopy, and then determining the 13CO2/12CO2 isotope ratio (δ13C) and 18OC16O/12CO2 isotope ratio (δ18O). The HWG sensor showed a fast response time of 3 s. Continuous measurement of δ13C and δ18O in the standard CO2 sample with known isotopic ratios for ∼2 h was performed. Precisions of 2.20‰ and 1.98‰ for δ13C and δ18O respectively at optimal integration time of 734 s were estimated from Allan variance analysis. Accuracy of -0.49‰ and -1.20‰ for δ13C and δ18O, respectively, were obtained with comparison to the values of the reference standard. The Kalman filtering method was employed to improve the precision and accuracy of the HWG sensor while maintaining high time resolution. Precision of 5.45‰ and 4.88‰ and the accuracy of 0.21‰ and -1.13‰ for δ13C and δ18O, respectively, were obtained at the integration time of 0.54 s with the application of Kalman filtering. The concentrations of 12CO2, 13CO2 and 18OC16O in breath cycles were measured and processed by Kalman filtering in real time. The measured values of δ18O and δ13C in exhaled breath were estimated to be -21.35‰ and -33.64‰, respectively, with the integration time of 1 s. This study demonstrates the ability of the HWG sensor to obtain δ13C and δ18O values in breath samples and its potential for immediate respiratory monitoring and disease diagnosis.
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4
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Seichter F, Vogt JA, Wachter U, Radermacher P, Mizaikoff B. Strategies for 13C enrichment calculation in Fourier-transform infrared CO2 spectra containing spectral overlapping and nonlinear abundance-amount relations utilizing response surface fits. Anal Chim Acta 2020; 1095:48-60. [DOI: 10.1016/j.aca.2019.10.038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 09/17/2019] [Accepted: 10/18/2019] [Indexed: 11/28/2022]
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5
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Dong B, Luo X, Zhu S, Hu T, Li M, Hasan D, Zhang L, Chua SJ, Wei J, Chang Y, Ma Y, Vachon P, Lo GQ, Ang KW, Kwong DL, Lee C. Thermal annealing study of the mid-infrared aluminum nitride on insulator (AlNOI) photonics platform. OPTICS EXPRESS 2019; 27:19815-19826. [PMID: 31503736 DOI: 10.1364/oe.27.019815] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Accepted: 05/28/2019] [Indexed: 05/19/2023]
Abstract
Aluminum nitride on insulator (AlNOI) photonics platform has great potential for mid-infrared applications thanks to the large transparency window, piezoelectric property, and second-order nonlinearity of AlN. However, the deployment of AlNOI platform might be hindered by the high propagation loss. We perform thermal annealing study and demonstrate significant loss improvement in the mid-infrared AlNOI photonics platform. After thermal annealing at 400°C for 2 hours in ambient gas environment, the propagation loss is reduced by half. Bend loss and taper coupling loss are also investigated. The performance of multimode interferometer, directional coupler, and add/drop filter are improved in terms of insertion loss, quality factor, and extinction ratio. Fourier-transform infrared spectroscopy, Raman spectroscopy, and X-ray diffraction spectroscopy suggest the loss improvement is mainly attributed to the reduction of extinction coefficient in the silicon dioxide cladding. Apart from loss improvement, appropriate thermal annealing also helps in reducing thin film stress.
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Tütüncü E, Nägele M, Becker S, Fischer M, Koeth J, Wolf C, Köstler S, Ribitsch V, Teuber A, Gröger M, Kress S, Wepler M, Wachter U, Vogt J, Radermacher P, Mizaikoff B. Advanced Photonic Sensors Based on Interband Cascade Lasers for Real-Time Mouse Breath Analysis. ACS Sens 2018; 3:1743-1749. [PMID: 30074387 DOI: 10.1021/acssensors.8b00477] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A multiparameter gas sensor based on distributed feedback interband cascade lasers emitting at 4.35 μm and ultrafast electro-spun luminescence oxygen sensors has been developed for the quantification and continuous monitoring of 13CO2/12CO2 isotopic ratio changes and oxygen in exhaled mouse breath samples. Mid-infrared absorption spectra for quantitatively monitoring the enrichment of 13CO2 levels were recorded in a miniaturized dual-channel substrate-integrated hollow waveguide using balanced ratiometric detection, whereas luminescence quenching was used for synchronously detecting exhaled oxygen levels. Allan variance analysis verified a CO2 measurement precision of 1.6‰ during a 480 s integration time. Routine online monitoring of exhaled mouse breath was performed in 14 mechanically ventilated and instrumented mice and demonstrated the feasibility of online isotope-selective exhaled breath analysis within microliters of probed gas samples using the reported combined sensor platform.
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Affiliation(s)
- Erhan Tütüncü
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Markus Nägele
- OptoPrecision GmbH, Auf der Höhe 15, 28357 Bremen, Germany
| | - Steffen Becker
- nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany
| | - Marc Fischer
- nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany
| | - Johannes Koeth
- nanoplus Nanosystems and Technologies GmbH, Oberer Kirschberg 4, 97218 Gerbrunn, Germany
| | - Christian Wolf
- Joanneum Research
Forschungsgesellschaft mbH., Materials - Institut für Oberflächentechnologien
und Photonik, Franz-Pichler-Straße 30, 8160 Weiz, Austria
| | - Stefan Köstler
- Joanneum Research
Forschungsgesellschaft mbH., Materials - Institut für Oberflächentechnologien
und Photonik, Franz-Pichler-Straße 30, 8160 Weiz, Austria
| | | | - Andrea Teuber
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Michael Gröger
- Institute of Anesthesiologic Pathophysiology and Method Development, Ulm University Medical Center, Helmholtzstr. 8/1, 89081 Ulm, Germany
| | - Sandra Kress
- Institute of Anesthesiologic Pathophysiology and Method Development, Ulm University Medical Center, Helmholtzstr. 8/1, 89081 Ulm, Germany
| | - Martin Wepler
- Institute of Anesthesiologic Pathophysiology and Method Development, Ulm University Medical Center, Helmholtzstr. 8/1, 89081 Ulm, Germany
| | - Ulrich Wachter
- Institute of Anesthesiologic Pathophysiology and Method Development, Ulm University Medical Center, Helmholtzstr. 8/1, 89081 Ulm, Germany
| | - Josef Vogt
- Institute of Anesthesiologic Pathophysiology and Method Development, Ulm University Medical Center, Helmholtzstr. 8/1, 89081 Ulm, Germany
| | - Peter Radermacher
- Institute of Anesthesiologic Pathophysiology and Method Development, Ulm University Medical Center, Helmholtzstr. 8/1, 89081 Ulm, Germany
| | - Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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7
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Wallace MAG, Pleil JD. Evolution of clinical and environmental health applications of exhaled breath research: Review of methods and instrumentation for gas-phase, condensate, and aerosols. Anal Chim Acta 2018; 1024:18-38. [PMID: 29776545 PMCID: PMC6082128 DOI: 10.1016/j.aca.2018.01.069] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 01/29/2018] [Accepted: 01/31/2018] [Indexed: 12/20/2022]
Abstract
Human breath, along with urine and blood, has long been one of the three major biological media for assessing human health and environmental exposure. In fact, the detection of odor on human breath, as described by Hippocrates in 400 BC, is considered the first analytical health assessment tool. Although less common in comparison to contemporary bio-fluids analyses, breath has become an attractive diagnostic medium as sampling is non-invasive, unlimited in timing and volume, and does not require clinical personnel. Exhaled breath, exhaled breath condensate (EBC), and exhaled breath aerosol (EBA) are different types of breath matrices used to assess human health and disease state. Over the past 20 years, breath research has made many advances in assessing health state, overcoming many of its initial challenges related to sampling and analysis. The wide variety of sampling techniques and collection devices that have been developed for these media are discussed herein. The different types of sensors and mass spectrometry instruments currently available for breath analysis are evaluated as well as emerging breath research topics, such as cytokines, security and airport surveillance, cellular respiration, and canine olfaction.
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Affiliation(s)
- M Ariel Geer Wallace
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC, 27711, USA.
| | - Joachim D Pleil
- U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, 109 T.W. Alexander Drive, Research Triangle Park, NC, 27711, USA.
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8
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Kokoric V, Theisen J, Wilk A, Penisson C, Bernard G, Mizaikoff B, Gabriel JCP. Determining the Partial Pressure of Volatile Components via Substrate-Integrated Hollow Waveguide Infrared Spectroscopy with Integrated Microfluidics. Anal Chem 2018; 90:4445-4451. [DOI: 10.1021/acs.analchem.7b04425] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vjekoslav Kokoric
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Johannes Theisen
- ICSM, CEA/CNRS/UM2/ENSCM UMR5257, CEA Grenoble, 17 Avenue des Martyrs, 38000 Grenoble, France
| | - Andreas Wilk
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Christophe Penisson
- ICSM, CEA/CNRS/UM2/ENSCM UMR5257, CEA Grenoble, 17 Avenue des Martyrs, 38000 Grenoble, France
| | - Gabriel Bernard
- ICSM, CEA/CNRS/UM2/ENSCM UMR5257, CEA Grenoble, 17 Avenue des Martyrs, 38000 Grenoble, France
| | - Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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9
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Stach R, Haas J, Tütüncü E, Daboss S, Kranz C, Mizaikoff B. polyHWG: 3D Printed Substrate-Integrated Hollow Waveguides for Mid-Infrared Gas Sensing. ACS Sens 2017; 2:1700-1705. [PMID: 29090579 DOI: 10.1021/acssensors.7b00649] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Gas analysis via mid-infrared (MIR) spectroscopic techniques has gained significance due to its inherent molecular selectivity and sensitivity probing pronounced vibrational, rotational, and roto-vibrational modes. In addition, MIR gas sensors are suitable for real-time monitoring in a wide variety of sensing scenarios. Our research team has recently introduced so-called substrate-integrated hollow waveguides (iHWGs) fabricated by precision milling, which have been demonstrated to be useful in online process monitoring, environmental sensing, and exhaled breath analysis especially if low sample volumes (i.e., few hundreds of microliters) are probed with rapid signal transients. A logical next step is to establish ultralightweight, potentially disposable, and low-cost substrate-integrated hollow waveguides, which may be readily customized and tailored to specific applications using 3D printing techniques. 3D printing provides access to an unprecedented variety of thermoplastic materials including biocompatible polylactides, readily etchable styrene copolymers, and magnetic or conductive materials. Thus, the properties of the waveguide may be adapted to suit its designated application, e.g., drone-mounted ultralightweight waveguides for environmental monitoring or biocompatible disposable sensor interfaces in medical/clinical applications.
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Affiliation(s)
- Robert Stach
- Institute of Analytical and
Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Julian Haas
- Institute of Analytical and
Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Erhan Tütüncü
- Institute of Analytical and
Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Sven Daboss
- Institute of Analytical and
Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Christine Kranz
- Institute of Analytical and
Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Boris Mizaikoff
- Institute of Analytical and
Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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10
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Tütüncü E, Kokoric V, Wilk A, Seichter F, Schmid M, Hunt WE, Manuel AM, Mirkarimi P, Alameda JB, Carter JC, Mizaikoff B. Fiber-Coupled Substrate-Integrated Hollow Waveguides: An Innovative Approach to Mid-infrared Remote Gas Sensors. ACS Sens 2017; 2:1287-1293. [PMID: 28792208 DOI: 10.1021/acssensors.7b00253] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, an innovative approach based on fiberoptically coupled substrate-integrated hollow waveguide (iHWG) gas cells for the analysis of low sample volumes suitable for remote broad- and narrow-band mid-infrared (MIR; 2.5-20 μm) sensing applications is reported. The feasibility of remotely addressing iHWG gas cells, configured in a double-pass geometry via a reflector, by direct coupling to a 7-around-1 mid-infrared fiber bundle is demonstrated, facilitating low-level hydrocarbon gas analysis. For comparison studies, two iHWGs with substrate dimensions of 50 × 50 × 12 mm (L × W × H) and geometric channel lengths of 138 and 58.5 mm, serving as miniature light-guiding gas cells, were fiber-coupled to a Fourier transform infrared spectrometer enabling broadband MIR sensing. In addition to the fundamental feasibility of this concept, the achievable sensitivity toward several gaseous hydrocarbons and the reproducibility of assembling the fiber-iHWG interface were investigated.
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Affiliation(s)
- Erhan Tütüncü
- Institute
of Analytical and Bioanalytical Chemistry (IABC), Ulm University, Albert-Einstein-Allee
11, 89081 Ulm, Germany
| | - Vjekoslav Kokoric
- Institute
of Analytical and Bioanalytical Chemistry (IABC), Ulm University, Albert-Einstein-Allee
11, 89081 Ulm, Germany
| | - Andreas Wilk
- Institute
of Analytical and Bioanalytical Chemistry (IABC), Ulm University, Albert-Einstein-Allee
11, 89081 Ulm, Germany
| | - Felicia Seichter
- Institute
of Analytical and Bioanalytical Chemistry (IABC), Ulm University, Albert-Einstein-Allee
11, 89081 Ulm, Germany
| | - Michael Schmid
- Institute
of Analytical and Bioanalytical Chemistry (IABC), Ulm University, Albert-Einstein-Allee
11, 89081 Ulm, Germany
| | - William E. Hunt
- Lawrence Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore, California 94550, United States
| | - Anastacia M. Manuel
- Lawrence Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore, California 94550, United States
| | - Paul Mirkarimi
- Lawrence Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore, California 94550, United States
| | - Jennifer B. Alameda
- Lawrence Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore, California 94550, United States
| | - J. Chance Carter
- Lawrence Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore, California 94550, United States
| | - Boris Mizaikoff
- Institute
of Analytical and Bioanalytical Chemistry (IABC), Ulm University, Albert-Einstein-Allee
11, 89081 Ulm, Germany
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11
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Seichter F, Vogt J, Radermacher P, Mizaikoff B. Nonlinear calibration transfer based on hierarchical Bayesian models and Lagrange Multipliers: Error bounds of estimates via Monte Carlo – Markov Chain sampling. Anal Chim Acta 2017; 951:32-45. [DOI: 10.1016/j.aca.2016.11.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 09/09/2016] [Accepted: 11/09/2016] [Indexed: 10/20/2022]
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12
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Kokoric V, Widmann D, Wittmann M, Behm RJ, Mizaikoff B. Infrared spectroscopy via substrate-integrated hollow waveguides: a powerful tool in catalysis research. Analyst 2016; 141:5990-5995. [DOI: 10.1039/c6an01534d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Monitoring catalyst performance via substrate-integrated hollow waveguide (iHWGs) assisted infrared spectroscopy.
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Affiliation(s)
- V. Kokoric
- Institute of Analytical and Bioanalytical Chemistry
- Ulm University
- 89081 Ulm
- Germany
| | - D. Widmann
- Institute of Surface Chemistry and Catalysis
- Ulm University
- 89069 Ulm
- Germany
| | - M. Wittmann
- Institute of Surface Chemistry and Catalysis
- Ulm University
- 89069 Ulm
- Germany
| | - R. J. Behm
- Institute of Surface Chemistry and Catalysis
- Ulm University
- 89069 Ulm
- Germany
| | - B. Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry
- Ulm University
- 89081 Ulm
- Germany
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13
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14
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Infrared attenuated total reflectance spectroscopy: an innovative strategy for analyzing mineral components in energy relevant systems. Sci Rep 2014; 4:6764. [PMID: 25358261 PMCID: PMC4215304 DOI: 10.1038/srep06764] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Accepted: 08/26/2014] [Indexed: 11/08/2022] Open
Abstract
The direct qualitative and quantitative determination of mineral components in shale rocks is a problem that has not been satisfactorily resolved to date. Infrared spectroscopy (IR) is a non-destructive method frequently used in mineral identification, yet challenging due to the similarity of spectral features resulting from quartz, clay, and feldspar minerals. This study reports on a significant improvement of this methodology by combining infrared attenuated total reflection spectroscopy (IR-ATR) with partial least squares (PLS) regression techniques for classifying and quantifying various mineral components present in a number of different shale rocks. The developed multivariate classification model was calibrated using pure component mixtures of the most common shale minerals (i.e., kaolinite, illite, montmorillonite, calcite, and quartz). Using this model, the IR spectra of 11 real-world shale samples were analyzed and evaluated. Finally, the performance of the developed IR-ATR method was compared with results obtained via X-ray diffraction (XRD) analysis.
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15
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Perez-Guaita D, Kokoric V, Wilk A, Garrigues S, Mizaikoff B. Towards the determination of isoprene in human breath using substrate-integrated hollow waveguide mid-infrared sensors. J Breath Res 2014; 8:026003. [PMID: 24848160 DOI: 10.1088/1752-7155/8/2/026003] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Selected volatile organic compounds (VOCs) in breath may be considered biomarkers if they are indicative of distinct diseases or disease states. Given the inherent molecular selectivity of vibrational spectroscopy, infrared sensing technologies appear ideally suitable for the determination of endogenous VOCs in breath. The aim of this study was to determine that mid-infrared (MIR; 3-20 µm) gas phase sensing is capable of determining isoprene in exhaled breath as an exemplary medically relevant VOC by hyphenating novel substrate-integrated hollow waveguides (iHWG) with a likewise miniaturized preconcentration system. A compact preconcentrator column for sampling isoprene from exhaled breath was coupled to an iHWG serving simultaneously as highly miniaturized gas cell and light conduit in combination with a compact Fourier transform infrared spectrometer. A gas mixing system enabled extensive system calibration using isoprene standards. After system optimization, a calibration function obtaining a limit of quantification of 106 ppb was achieved. According to the literature, the obtained sensitivity is sufficient for quantifying middle to high isoprene concentrations occurring in exhaled breath. Finally, a volunteer breath sample was analysed proving comparable values of isoprene in a real-world scenario. Despite its fundamental utility, the proposed methodology contains some limitations in terms of sensitivity and temporal resolution in comparison with the readily available measurement techniques that should be addressed during future optimization of the system. Nonetheless, this study presents the first determination of endogenous VOCs in breath via advanced hollow waveguide MIR sensor technology, clearly demonstrating its potential for the analysis of volatile biomarkers in exhaled breath.
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Affiliation(s)
- David Perez-Guaita
- Analytical Chemistry Department, University of Valencia, EdificiJeroni Muñoz, Burjassot, Spain
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16
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Abstract
Despite providing the opportunity for directly sensing molecular constituents with inherent fingerprint specificity in the 2.5-20 μm spectral regime, mid-infrared optical sensing technologies have not yet achieved the same penetration in waveguide-based chem/bio sensing compared to related sensing schemes operating at visible and near-infrared frequencies. In this review, current advances in mid-infrared chem/bio sensor technology will be highlighted and contrasted with the prevalent bottlenecks that have to date limited a more widespread adoption of mid-infrared sensing devices. However, with the increasing availability of advanced light sources such as quantum cascade lasers and the advent of on-chip semiconductor waveguide technologies, a prosperous future of this sensing concept for label-free detection in environmental analysis, process monitoring, and bioanalytics is perceived.
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Affiliation(s)
- Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, University of Ulm, Albert-Einstein-Allee 11, 89081 Ulm, Germany.
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17
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Libardi SH, Skibsted LH, Cardoso DR. Oxidation of carbon monoxide by perferrylmyoglobin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:1950-5. [PMID: 24506496 DOI: 10.1021/jf4053176] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Perferrylmyoglobin is found to oxidize CO in aerobic aqueous solution to CO2. Tryptophan hydroperoxide in the presence of tetra(4-sulfonatophenyl)-porphyrinate-iron(III) or simple iron(II)/(III) salts shows similar reactivity against CO. The oxidation of CO is for tryptophan hydroperoxide concluded to depend on the formation of alkoxyl radicals by reductive cleavage by iron(II) or on the formation of peroxyl radicals by oxidative cleavage by iron(III). During oxidation of CO, the tryptophan peroxyl radical was depleted with a rate constant of 0.26 ± 0.01 s(-1) for CO-saturated aqueous solution of pH 7.4 at 25 °C without concomitant reduction of the iron(IV) center. Carbon monoxide is as a natural metabolite accordingly capable of scavenging tryptophan radicals in myoglobin activated by peroxides with a second-order rate constant of (3.3 ± 0.6) × 10(2) L mol(-1) s(-1), a reaction that might be of importance in cellular membranes of the intestine for protection of tissue against radical damage during meat digestion.
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Affiliation(s)
- Silvia H Libardi
- Instituto de Quı́mica de São Carlos, Universidade de São Paulo , Av. Trabalhador São Carlense 400, CP 780, CEP 13560-970 São Carlos, SP, Brazil
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Wilk A, Carter JC, Chrisp M, Manuel AM, Mirkarimi P, Alameda JB, Mizaikoff B. Substrate-Integrated Hollow Waveguides: A New Level of Integration in Mid-Infrared Gas Sensing. Anal Chem 2013; 85:11205-10. [DOI: 10.1021/ac402391m] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andreas Wilk
- Institute
of Analytical and Bioanalytical Chemistry (IABC), University of Ulm, Albert-Einstein-Allee
11, 89081 Ulm, Germany
| | - J. Chance Carter
- Lawrence
Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore California 94550, United States
| | - Michael Chrisp
- Lawrence
Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore California 94550, United States
| | - Anastacia M. Manuel
- Lawrence
Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore California 94550, United States
| | - Paul Mirkarimi
- Lawrence
Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore California 94550, United States
| | - Jennifer B. Alameda
- Lawrence
Livermore National Laboratory (LLNL), 7000 East Avenue, Livermore California 94550, United States
| | - Boris Mizaikoff
- Institute
of Analytical and Bioanalytical Chemistry (IABC), University of Ulm, Albert-Einstein-Allee
11, 89081 Ulm, Germany
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Improving the performance of hollow waveguide-based infrared gas sensors via tailored chemometrics. Anal Bioanal Chem 2013; 405:8223-32. [DOI: 10.1007/s00216-013-7230-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Revised: 06/21/2013] [Accepted: 07/08/2013] [Indexed: 11/25/2022]
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