1
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Merian A, Silva A, Wolf S, Frosch T, Frosch T. Ultrasensitive Raman Gas Spectroscopy for Dinitrogen Sensing at the Parts-per-Billion Level. Anal Chem 2024; 96:14884-14890. [PMID: 39231523 PMCID: PMC11412228 DOI: 10.1021/acs.analchem.4c02828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2024]
Abstract
Sensing small changes in the concentration of dinitrogen (N2) is a difficult analytical task. As N2-sensing is crucial for nitrogen cycle research in general and studies of denitrification in particular, researchers went to great lengths to develop techniques like the gas-flow-soil-core method, which achieves a precision of 200 ppb at 20 ppm of N2. Here, we present a Raman gas spectroscopic technique based on high pressure, high laser power, and high-NA signal collection, which achieves a limit of detection (LoD) of 59 ppb N2 and a precision of 27 ppb at 10 ppm of N2. This improves the lowest LoD for N2 reported for Raman gas spectroscopy by 2 orders of magnitude. Furthermore, this constitutes an improvement in precision by 1 order of magnitude compared to the GC-MS-based gas-flow-soil-core method currently established in denitrification research. We show that the presented setup is both stable and tight enough to ensure highly sensitive, precise, and repeatable measurements of N2. As Raman gas spectroscopy is a versatile and comprehensive method, the described technique could be easily expanded to other relevant gases like nitrous oxide or to simultaneous multigas sensing. In summary, our method offers possibilities for N2-sensing and could eventually enable denitrification studies with increased sensitivity and a larger scope.
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Affiliation(s)
- Andreas Merian
- Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstr. 25, 64283 Darmstadt, Germany
| | - Artur Silva
- Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstr. 25, 64283 Darmstadt, Germany
| | - Sebastian Wolf
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Timea Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Torsten Frosch
- Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstr. 25, 64283 Darmstadt, Germany
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
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2
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Jafari A, Seth K, Werner A, Shi S, Hofmann R, Hoyos-Villegas V. Probing Biological Nitrogen Fixation in Legumes Using Raman Spectroscopy. SENSORS (BASEL, SWITZERLAND) 2024; 24:4944. [PMID: 39123990 PMCID: PMC11314804 DOI: 10.3390/s24154944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Revised: 07/24/2024] [Accepted: 07/27/2024] [Indexed: 08/12/2024]
Abstract
Biological nitrogen fixation (BNF) by symbiotic bacteria plays a vital role in sustainable agriculture. However, current quantification methods are often expensive and impractical. This study explores the potential of Raman spectroscopy, a non-invasive technique, for rapid assessment of BNF activity in soybeans. Raman spectra were obtained from soybean plants grown with and without rhizobia bacteria to identify spectral signatures associated with BNF. δN15 isotope ratio mass spectrometry (IRMS) was used to determine actual BNF percentages. Partial least squares regression (PLSR) was employed to develop a model for BNF quantification based on Raman spectra. The model explained 80% of the variation in BNF activity. To enhance the model's specificity for BNF detection regardless of nitrogen availability, a subsequent elastic net (Enet) regularisation strategy was implemented. This approach provided insights into key wavenumbers and biochemicals associated with BNF in soybeans.
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Affiliation(s)
| | - Kritarth Seth
- AgResearch, Lincoln 7608, New Zealand; (K.S.); (S.S.)
| | - Armin Werner
- Lincoln Agritech, Lincoln University, Lincoln 7647, New Zealand;
| | - Shengjing Shi
- AgResearch, Lincoln 7608, New Zealand; (K.S.); (S.S.)
| | - Rainer Hofmann
- Plant Biology Department, Lincoln University, Lincoln 7647, New Zealand;
| | - Valerio Hoyos-Villegas
- Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, QC H3A 0G4, Canada;
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3
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Blohm A, Domes C, Merian A, Wolf S, Popp J, Frosch T. Comprehensive multi-gas study by means of fiber-enhanced Raman spectroscopy for the investigation of nitrogen cycle processes. Analyst 2024; 149:1885-1894. [PMID: 38357795 DOI: 10.1039/d4an00023d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
The extensive use of synthetic fertilizers has led to a considerable increase in reactive nitrogen input into agricultural and natural systems, resulting in negative effects in multiple ecosystems, the so-called nitrogen cascade. Since the global population relies on fertilization for food production, synthetic fertilizer use needs to be optimized by balancing crop yield and reactive nitrogen losses. Fiber-enhanced Raman spectroscopy (FERS) is introduced as a unique method for the simultaneous quantification of multiple gases to the study processes related to the nitrogen cycle. By monitoring changes in the headspace gas concentrations, processes such as denitrification, nitrification, respiration, and nitrogen fixation, as well as fertilizer addition were studied. The differences in concentration between the ambient and prepared process samples were evident in the Raman spectra, allowing for differentiation of process-specific spectra. Gas mixture concentrations were quantified within a range of low ppm to 100% for the gases N2, O2, CO2, N2O, and NH3. Compositional changes were attributed to processes of the nitrogen cycle. With help of multivariate curve resolution, it was possible to quantify N2O and CO2 simultaneously. The impact of fertilizers on N-cycle processes in soil was simulated and analyzed for identifying active processes. Thus, FERS was proven to be a suitable technique to optimize fertilizer composition and to quantify N2O and NH3 emissions, all with a single device and without further sample preparation.
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Affiliation(s)
- Annika Blohm
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Christian Domes
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Andreas Merian
- Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstraße 25, 64283 Darmstadt, Germany.
| | - Sebastian Wolf
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
- Abbe Centre of Photonics, Friedrich Schiller University, 07743 Jena, Germany
| | - Torsten Frosch
- Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstraße 25, 64283 Darmstadt, Germany.
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
- Abbe Centre of Photonics, Friedrich Schiller University, 07743 Jena, Germany
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4
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Blohm A, Domes C, Frosch T. Isotopomeric Peak Assignment for N 2O in Cross-Labeling Experiments by Fiber-Enhanced Raman Multigas Spectroscopy. Anal Chem 2024. [PMID: 38315571 PMCID: PMC10882577 DOI: 10.1021/acs.analchem.3c04236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Human intervention in nature, especially fertilization, greatly increased the amount of N2O emission. While nitrogen fertilizer is used to improve nitrogen availability and thus plant growth, one negative side effect is the increased emission of N2O. Successful regulation and optimization strategies require detailed knowledge of the processes producing N2O in soil. Nitrification and denitrification, the main processes responsible for N2O emissions, can be differentiated using isotopic analysis of N2O. The interplay between these processes is complex, and studies to unravel the different contributions require isotopic cross-labeling and analytical techniques that enable tracking of the labeled compounds. Fiber-enhanced Raman spectroscopy (FERS) was exploited for sensitive quantification of N2O isotopomers alongside N2, O2, and CO2 in multigas compositions and in cross-labeling experiments. FERS enabled the selective and sensitive detection of specific molecular vibrations that could be assigned to various isotopomer peaks. The isotopomers 14N15N16O (2177 cm-1) and 15N14N16O (2202 cm-1) could be clearly distinguished, allowing site-specific measurements. Also, isotopomers containing different oxygen isotopes, such as 14N14N17O, 14N14N18O, 15N15N16O, and 15N14N18O could be identified. A cross-labeling showed the capability of FERS to disentangle the contributions of nitrification and denitrification to the total N2O fluxes while quantifying the total sample headspace composition. Overall, the presented results indicate the potential of FERS for isotopic studies of N2O, which could provide a deeper understanding of the different pathways of the nitrogen cycle.
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Affiliation(s)
- Annika Blohm
- Leibniz Institute of Photonic Technology, Albert Einstein Str. 9, 07745 Jena, Germany
| | - Christian Domes
- Leibniz Institute of Photonic Technology, Albert Einstein Str. 9, 07745 Jena, Germany
| | - Torsten Frosch
- Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstr. 25, 64283 Darmstadt, Germany
- Leibniz Institute of Photonic Technology, Albert Einstein Str. 9, 07745 Jena, Germany
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5
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Zhang H, Plett JM, Catunda KLM, Churchill AC, Moore BD, Powell JR, Power SA, Yang J, Anderson IC. Rapid quantification of biological nitrogen fixation using optical spectroscopy. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:760-771. [PMID: 37891011 DOI: 10.1093/jxb/erad426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 10/27/2023] [Indexed: 10/29/2023]
Abstract
Biological nitrogen fixation (BNF) provides a globally important input of nitrogen (N); its quantification is critical but technically challenging. Leaf reflectance spectroscopy offers a more rapid approach than traditional techniques to measure plant N concentration ([N]) and isotopes (δ15N). Here we present a novel method for rapidly and inexpensively quantifying BNF using optical spectroscopy. We measured plant [N], δ15N, and the amount of N derived from atmospheric fixation (Ndfa) following the standard traditional methodology using isotope ratio mass spectrometry (IRMS) from tissues grown under controlled conditions and taken from field experiments. Using the same tissues, we predicted the same three parameters using optical spectroscopy. By comparing the optical spectroscopy-derived results with traditional measurements (i.e. IRMS), the amount of Ndfa predicted by optical spectroscopy was highly comparable to IRMS-based quantification, with R2 being 0.90 (slope=0.90) and 0.94 (slope=1.02) (root mean square error for predicting legume δ15N was 0.38 and 0.43) for legumes grown in glasshouse and field, respectively. This novel application of optical spectroscopy facilitates BNF studies because it is rapid, scalable, low cost, and complementary to existing technologies. Moreover, the proposed method successfully captures the dynamic response of BNF to climate changes such as warming and drought.
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Affiliation(s)
- Haiyang Zhang
- College of Life Sciences, Hebei University, Baoding, China
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Jonathan M Plett
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Karen L M Catunda
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Amber C Churchill
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
- Department of Ecology, Evolution and Behavior, University of Minnesota, 140 Gortner Laboratory, 1479 Gortner Ave., St Paul, MN 55108, USA
| | - Ben D Moore
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Jeff R Powell
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Sally A Power
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Jinyan Yang
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
| | - Ian C Anderson
- Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW, 2751, Australia
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6
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Domes R, Frosch T. Molecular Interactions Identified by Two-Dimensional Analysis-Detailed Insight into the Molecular Interactions of the Antimalarial Artesunate with the Target Structure β-Hematin by Means of 2D Raman Correlation Spectroscopy. Anal Chem 2023; 95:12719-12731. [PMID: 37586701 PMCID: PMC10469332 DOI: 10.1021/acs.analchem.3c01415] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2023] [Accepted: 07/11/2023] [Indexed: 08/18/2023]
Abstract
A thorough understanding of the interaction of endoperoxide antimalarial agents with their biological target structures is of utmost importance for the tailored design of future efficient antimalarials. Detailed insights into molecular interactions between artesunate and β-hematin were derived with a combination of resonance Raman spectroscopy, two-dimensional correlation analysis, and density functional theory calculations. Resonance Raman spectroscopy with three distinct laser wavelengths enabled the specific excitation of different chromophore parts of β-hematin. The resonance Raman spectra of the artesunate-β-hematin complexes were thoroughly analyzed with the help of high-resolution and highly sensitive two-dimensional correlation spectroscopy. Spectral changes in the peak properties were found with increasing artesunate concentration. Changes in the low-frequency, morphology-sensitive Raman bands indicated a loss in crystallinity of the drug-target complexes. Differences in the high-wavenumber region were assigned to increased distortions of the planarity of the structure of the target molecule due to the appearance of various coexisting alkylation species. Evidence for the appearance of high-valent ferryl-oxo species could be observed with the help of differences in the peak properties of oxidation-state sensitive Raman modes. To support those findings, the relaxed ground-state structures of ten possible covalent mono- and di-meso(Cm)-alkylated hematin-dihydroartemisinyl complexes were calculated using density functional theory. A very good agreement with the experimental peak properties was achieved, and the out-of-plane displacements along the lowest-frequency normal coordinates were investigated by normal coordinate structural decomposition analysis. The strongest changes in all data were observed in vibrations with a high participation of Cm-parts of β-hematin.
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Affiliation(s)
- Robert Domes
- Leibniz
Institute of Photonic Technology, Albert Einstein Strasse 9, D-07745 Jena, Germany
| | - Torsten Frosch
- Biophotonics and
Biomedical Engineering Group, Technical
University Darmstadt, Merckstraße 25, 64283 Darmstadt, Germany
- Leibniz
Institute of Photonic Technology, Albert Einstein Strasse 9, D-07745 Jena, Germany
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7
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Wolf S, Domes R, Merian A, Domes C, Frosch T. Parallelized Raman Difference Spectroscopy for the Investigation of Chemical Interactions. Anal Chem 2022; 94:10346-10354. [PMID: 35820661 DOI: 10.1021/acs.analchem.2c00222] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Raman spectroscopy provides an extremely high chemical selectivity. Raman difference spectroscopy is a technique to reveal even the smallest differences that occur due to weak interactions between substances and changes in the molecular structure. To enable parallelized and highly sensitive Raman difference spectroscopy in a microtiter-array, a diffractive optical element, a lens array, and a fiber bundle were integrated into a Raman spectroscopy setup in a unique fashion. The setup was evaluated with a microtiter-array containing pyridine-water complexes, and subwavenumber changes below the spectrometer's resolution could be resolved. The spectral changes were emphasized with two-dimensional correlation analysis. Density functional theory calculation and "atoms in molecule" analysis were performed to simulate the intermolecular long-range interactions between water and pyridine molecules and to get insight into the involved noncovalent interactions, respectively. It was found that by the addition of pyridine, the energy portion of hydrogen bonds to the total complexation energy between pyridine and water reduces. These results demonstrate the unique abilities of the new setup to investigate subtle changes due to biochemically important molecular interactions and opens new avenues to perform drug binding assays and to monitor highly parallelized chemical reactions.
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Affiliation(s)
- Sebastian Wolf
- Leibniz Institute of Photonic Technology, Jena 07745, Germany
| | - Robert Domes
- Leibniz Institute of Photonic Technology, Jena 07745, Germany
| | - Andreas Merian
- Leibniz Institute of Photonic Technology, Jena 07745, Germany
| | - Christian Domes
- Leibniz Institute of Photonic Technology, Jena 07745, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, Jena 07745, Germany.,Abbe Center of Photonics, Friedrich Schiller University, Jena 07745, Germany.,Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstraße 25, 64283 Darmstadt, Germany
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8
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Lee J, Hestrin R, Nuccio EE, Morrison KD, Ramon CE, Samo TJ, Pett-Ridge J, Ly SS, Laurence TA, Weber PK. Label-Free Multiphoton Imaging of Microbes in Root, Mineral, and Soil Matrices with Time-Gated Coherent Raman and Fluorescence Lifetime Imaging. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:1994-2008. [PMID: 35029104 DOI: 10.1021/acs.est.1c05818] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Imaging biogeochemical interactions in complex microbial systems─such as those at the soil-root interface─is crucial to studies of climate, agriculture, and environmental health but complicated by the three-dimensional (3D) juxtaposition of materials with a wide range of optical properties. We developed a label-free multiphoton nonlinear imaging approach to provide contrast and chemical information for soil microorganisms in roots and minerals with epi-illumination by simultaneously imaging two-photon excitation fluorescence (TPEF), coherent anti-Stokes Raman scattering (CARS), second-harmonic generation (SHG), and sum-frequency mixing (SFM). We used fluorescence lifetime imaging (FLIM) and time gating to correct CARS for the autofluorescence background native to soil particles and fungal hyphae (TG-CARS) using time-correlated single-photon counting (TCSPC). We combined TPEF, TG-CARS, and FLIM to maximize image contrast for live fungi and bacteria in roots and soil matrices without fluorescence labeling. Using this instrument, we imaged symbiotic arbuscular mycorrhizal fungi (AMF) structures within unstained plant roots in 3D to 60 μm depth. High-quality imaging was possible at up to 30 μm depth in a clay particle matrix and at 15 μm in complex soil preparation. TG-CARS allowed us to identify previously unknown lipid droplets in the symbiotic fungus, Serendipita bescii. We also visualized unstained putative bacteria associated with the roots of Brachypodium distachyon in a soil microcosm. Our results show that this multimodal approach holds significant promise for rhizosphere and soil science research.
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Affiliation(s)
- Janghyuk Lee
- Materials Science Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Rachel Hestrin
- Nuclear and Chemical Sciences Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Erin E Nuccio
- Nuclear and Chemical Sciences Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Keith D Morrison
- Nuclear and Chemical Sciences Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Christina E Ramon
- Nuclear and Chemical Sciences Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Ty J Samo
- Nuclear and Chemical Sciences Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Jennifer Pett-Ridge
- Nuclear and Chemical Sciences Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
- Life and Environmental Sciences Department, University of California Merced, Merced, California 95343, United States
| | - Sonny S Ly
- Materials Science Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Ted A Laurence
- Materials Science Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Peter K Weber
- Nuclear and Chemical Sciences Division, Physical & Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
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9
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Wang J, Chen W, Wang P, Zhang Z, Wan F, Zhou F, Song R, Wang Y, Gao S. Fiber-enhanced Raman spectroscopy for highly sensitive H 2 and SO 2 sensing with a hollow-core anti-resonant fiber. OPTICS EXPRESS 2021; 29:32296-32311. [PMID: 34615304 DOI: 10.1364/oe.437693] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/13/2021] [Indexed: 06/13/2023]
Abstract
An innovative fiber-enhanced Raman gas sensing system with a hollow-core anti-resonant fiber is introduced. Two iris diaphragms are implemented for spatial filtering, and a reflecting mirror is attached to one fiber end that provides a highly improved Raman signal enhancement over 2.9 times than the typical bare fiber system. The analytical performance for multigas compositions is thoroughly demonstrated by recording the Raman spectra of carbon dioxide (CO2), oxygen (O2), nitrogen (N2), hydrogen (H2), and sulfur dioxide (SO2) with limits of detection down to low-ppm levels as well as a long-term instability < 1.05%. The excellent linear relationship between Raman signal intensity (peak height) and gas concentrations indicates a promising potential for accurate quantification.
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10
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Knebl A, Domes C, Domes R, Wolf S, Popp J, Frosch T. Hydrogen and C2-C6 Alkane Sensing in Complex Fuel Gas Mixtures with Fiber-Enhanced Raman Spectroscopy. Anal Chem 2021; 93:10546-10552. [PMID: 34297525 DOI: 10.1021/acs.analchem.1c01500] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Power-to-gas is a heavily discussed option to store surplus electricity from renewable sources. Part of the generated hydrogen could be fed into the gas grid and lead to fluctuations in the composition of the fuel gas. Consequently, both operators of transmission networks and end users would need to frequently monitor the gas to ensure safety as well as optimal and stable operation. Currently, gas chromatography-based analysis methods are the state of the art. However, these methods have several downsides for time-resolved and distributed application and Raman gas spectroscopy is favorable for future point-of-use monitoring. Here, we demonstrate that fiber-enhanced Raman gas spectroscopy (FERS) enables the simultaneous detection of all relevant gases, from major (methane, CH4; hydrogen, H2) to minor (C2-C6 alkanes) fuel gas components. The characteristic peaks of H2 (585 cm-1), CH4 (2917 cm-1), isopentane (765 cm-1), i-butane (798 cm-1), n-butane (830 cm-1), n-pentane (840 cm-1), propane (869 cm-1), ethane (993 cm-1), and n-hexane (1038 cm-1) are well resolved in the broadband spectra acquired with a compact spectrometer. The fiber enhancement achieved in a hollow-core antiresonant fiber enables highly sensitive measurements with limits of detection between 90 and 180 ppm for different hydrocarbons. Both methane and hydrogen were quantified with high accuracy with average relative errors of 1.1% for CH4 and 1.5% for H2 over a wide concentration range. These results show that FERS is ideally suited for comprehensive fuel gas analysis in a future, where regenerative sources lead to fluctuations in the composition of gas.
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Affiliation(s)
- Andreas Knebl
- Leibniz Institute of Photonic Technology Jena, Albert Einstein Strasse 9, Jena 07745, Germany
| | - Christian Domes
- Leibniz Institute of Photonic Technology Jena, Albert Einstein Strasse 9, Jena 07745, Germany
| | - Robert Domes
- Leibniz Institute of Photonic Technology Jena, Albert Einstein Strasse 9, Jena 07745, Germany
| | - Sebastian Wolf
- Leibniz Institute of Photonic Technology Jena, Albert Einstein Strasse 9, Jena 07745, Germany
| | - Juergen Popp
- Leibniz Institute of Photonic Technology Jena, Albert Einstein Strasse 9, Jena 07745, Germany.,Institute of Physical Chemistry & Abbe Center of Photonics, Friedrich Schiller University, Jena 07745, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology Jena, Albert Einstein Strasse 9, Jena 07745, Germany.,Institute of Physical Chemistry & Abbe Center of Photonics, Friedrich Schiller University, Jena 07745, Germany.,Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstraße 25, Darmstadt 64283, Germany
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11
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Blohm A, Kumar S, Knebl A, Herrmann M, Küsel K, Popp J, Frosch T. Activity and electron donor preference of two denitrifying bacterial strains identified by Raman gas spectroscopy. Anal Bioanal Chem 2021; 414:601-611. [PMID: 34297136 PMCID: PMC8748363 DOI: 10.1007/s00216-021-03541-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2021] [Revised: 07/06/2021] [Accepted: 07/08/2021] [Indexed: 11/26/2022]
Abstract
Human activities have greatly increased the input of reactive nitrogen species into the environment and disturbed the balance of the global N cycle. This imbalance may be offset by bacterial denitrification, an important process in maintaining the ecological balance of nitrogen. However, our understanding of the activity of mixotrophic denitrifying bacteria is not complete, as most research has focused on heterotrophic denitrification. The aim of this study was to investigate substrate preferences for two mixotrophic denitrifying bacterial strains, Acidovorax delafieldii and Hydrogenophaga taeniospiralis, under heterotrophic, autotrophic or mixotrophic conditions. This complex analysis was achieved by simultaneous identification and quantification of H2, O2, CO2, 14N2, 15N2 and 15N2O in course of the denitrification process with help of cavity-enhanced Raman spectroscopic (CERS) multi-gas analysis. To disentangle electron donor preferences for both bacterial strains, microcosm-based incubation experiments under varying substrate conditions were conducted. We found that Acidovorax delafieldii preferentially performed heterotrophic denitrification in the mixotrophic sub-experiments, while Hydrogenophaga taeniospiralis preferred autotrophic denitrification in the mixotrophic incubation. These observations were supported by stoichiometric calculations. The results demonstrate the prowess of advanced Raman multi-gas analysis to study substrate use and electron donor preferences in denitrification, based on the comprehensive quantification of complex microbial gas exchange processes.
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Affiliation(s)
- Annika Blohm
- Leibniz Institute of Photonic Technology, 07745, Jena, Germany
| | - Swatantar Kumar
- Institute of Biodiversity, Friedrich Schiller University Jena, 07743, Jena, Germany
| | - Andreas Knebl
- Leibniz Institute of Photonic Technology, 07745, Jena, Germany
| | - Martina Herrmann
- Institute of Biodiversity, Friedrich Schiller University Jena, 07743, Jena, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
| | - Kirsten Küsel
- Institute of Biodiversity, Friedrich Schiller University Jena, 07743, Jena, Germany
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, 04103, Leipzig, Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology, 07745, Jena, Germany
- Institute of Physical Chemistry, Friedrich Schiller University Jena, 07743, Jena, Germany
- Abbe Centre of Photonics, Friedrich Schiller University, 07743, Jena, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, 07745, Jena, Germany.
- Institute of Physical Chemistry, Friedrich Schiller University Jena, 07743, Jena, Germany.
- Abbe Centre of Photonics, Friedrich Schiller University, 07743, Jena, Germany.
- Biophotonics and Biomedical Engineering Group, Technical University Darmstadt, Merckstraße 25, 64283, Darmstadt, Germany.
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12
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Chisanga M, Muhamadali H, McDougall D, Xu Y, Lockyer N, Goodacre R. Metabolism in action: stable isotope probing using vibrational spectroscopy and SIMS reveals kinetic and metabolic flux of key substrates. Analyst 2021; 146:1734-1746. [PMID: 33465215 DOI: 10.1039/d0an02319a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Microbial communities play essential functions which drive various ecosystems supporting animal and aquatic life. However, linking bacteria with specific metabolic functions is difficult, since microbial communities consist of numerous and phylogenetically diverse microbes. Stable isotope probing (SIP) combined with single-cell tools has emerged as a novel culture-independent strategy for unravelling microbial metabolic roles and intertwined interactions in complex communities. In this study, we applied Raman and Fourier-transform infrared (FT-IR) spectroscopies, secondary ion mass spectrometry (SIMS) with SIP to probe the rate of 13C incorporation in Escherichia coli at 37 and 25 °C. Our results indicate quantitative enrichment and flow of 13C into E. coli at various time points. Multivariate and univariate analyses of Raman and FT-IR data demonstrated distinctive 13C concentration-dependent trends that were due to vibrational bands shifting to lower frequencies and these shifts were a result of incubation time and metabolic rate. SIMS results were in complete agreement with the spectroscopy findings, and confirmed the detected levels of 13C incorporation into microbial biomass at the investigated conditions. Having established that FT-IR and Raman spectroscopy with SIP can measure metabolism kinetics in this simple system, we have applied the kinetics concept to study the metabolism of phenol by Pseudomonas putida and metabolic interactions within a two-species consortia with E. coli that could not degrade phenol. Raman spectroscopy combined with SIP identified quantitative shifts in P. putida due to temporal assimilation of phenol. Although E. coli was unable to grow on phenol, in co-culture with P. putida, general metabolic probing using deuterated water for SIP revealed that E. coli displayed increasing metabolic activity, presumably due to cross feeding from metabolites generated by P. putida. This study clearly demonstrates that Raman and FT-IR combined with SIP provide rapid and sensitive detection of carbon incorporation rates and microbial interactions. These novel findings may guide the identification of primary substrate consumers in complex microbial communities in situ, which is a key step towards the characterisation of novel genes, enzymes and metabolic flux analysis in microbial consortia.
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Affiliation(s)
- Malama Chisanga
- Department of Chemistry, Manchester Institute of Biotechnology, University of Manchester, Manchester, M1 7DN, UK
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13
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A Short Review of Cavity-Enhanced Raman Spectroscopy for Gas Analysis. SENSORS 2021; 21:s21051698. [PMID: 33801211 PMCID: PMC7957899 DOI: 10.3390/s21051698] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 02/21/2021] [Accepted: 02/25/2021] [Indexed: 12/16/2022]
Abstract
The market of gas sensors is mainly governed by electrochemical, semiconductor, and non-dispersive infrared absorption (NDIR)-based optical sensors. Despite offering a wide range of detectable gases, unknown gas mixtures can be challenging to these sensor types, as appropriate combinations of sensors need to be chosen beforehand, also reducing cross-talk between them. As an optical alternative, Raman spectroscopy can be used, as, in principle, no prior knowledge is needed, covering nearly all gas compounds. Yet, it has the disadvantage of a low quantum yield through a low scattering cross section for gases. There have been various efforts to circumvent this issue by enhancing the Raman yield through different methods. For gases, in particular, cavity-enhanced Raman spectroscopy shows promising results. Here, cavities can be used to enhance the laser beam power, allowing higher laser beam-analyte interaction lengths, while also providing the opportunity to utilize lower cost equipment. In this work, we review cavity-enhanced Raman spectroscopy, particularly the general research interest into this topic, common setups, and already achieved resolutions.
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14
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Knebl A, Domes R, Wolf S, Domes C, Popp J, Frosch T. Fiber-Enhanced Raman Gas Spectroscopy for the Study of Microbial Methanogenesis. Anal Chem 2020; 92:12564-12571. [PMID: 32845132 DOI: 10.1021/acs.analchem.0c02507] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Microbial methanogenesis is a key biogeochemical process in the carbon cycle that is responsible for 70% of global emissions of the potent greenhouse gas methane (CH4). Further knowledge about microbial methanogenesis is crucial to mitigate emissions, increase climate model accuracy, or advance methanogenic biogas production. The current understanding of the substrate use of methanogenic microbes is limited, especially regarding the methylotrophic pathway. Here, we present fiber-enhanced Raman spectroscopy (FERS) of headspace gases as an alternate tool to study methanogenesis and substrate use in particular. The optical technique is nondestructive and sensitive to CH4, hydrogen (H2), and carbon dioxide with a large dynamic range from trace levels (demonstrated LoDs: CH4, 3 ppm; H2, 49 ppm) to pure gases. In addition, the portable FERS system can provide quantitative information about methanol concentration in the liquid phase of microbial cultures through headspace gas sampling (LoD 25 ppm). We demonstrate how FERS gas sensing could enable us to track substrate and product levels of microbial methanogenesis with just one instrument. The versatility of Raman gas spectroscopy could moreover help us to elucidate links between nitrogen and carbon cycle in microbial communities in the near future.
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Affiliation(s)
- Andreas Knebl
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Robert Domes
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Sebastian Wolf
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Christian Domes
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Juergen Popp
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany.,Friedrich Schiller University, Institute of Physical Chemistry, 07743 Jena, Germany.,Friedrich Schiller University, Abbe Center of Photonics, 07745 Jena, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany.,Friedrich Schiller University, Institute of Physical Chemistry, 07743 Jena, Germany.,Friedrich Schiller University, Abbe Center of Photonics, 07745 Jena, Germany
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15
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Wang P, Chen W, Wang J, Tang J, Shi Y, Wan F. Multigas Analysis by Cavity-Enhanced Raman Spectroscopy for Power Transformer Diagnosis. Anal Chem 2020; 92:5969-5977. [PMID: 32216282 DOI: 10.1021/acs.analchem.0c00179] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We demonstrate the utility of cavity-enhanced Raman spectroscopy (CERS) as a unique multigas analysis tool for power transformer diagnosis. For this purpose, improvements have been added to our recently introduced CERS apparatus. Based on optical feedback frequency-locking, laser radiation is coupled into a high-finesse optical cavity, thus resulting in huge intracavity laser power. With 20 s exposure time, ppm-level gas sensing at 1 bar total pressure is achieved, including carbon dioxide (CO2), carbon monoxide (CO), hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), nitrogen (N2), and oxygen (O2). By using the internal standard gas (sulfur hexafluoride, SF6), the quantification of multigas with high accuracy is also realized, which is confirmed by the measurement of calibration gases. For fault diagnosis, transformer oil is sampled from a 110 kV power transformer in service. Dissolved gases are extracted and analyzed by the CERS apparatus. Then the transformer is diagnosed according to the measurement results. CERS has the ability to analyze multigas with high selectivity, sensitivity, and accuracy, it has great potential in gas sensing fields.
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Affiliation(s)
- Pinyi Wang
- State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, No. 174, Shazheng Street, Chongqing, 400044, China
| | - Weigen Chen
- State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, No. 174, Shazheng Street, Chongqing, 400044, China
| | - Jianxin Wang
- State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, No. 174, Shazheng Street, Chongqing, 400044, China
| | - Jun Tang
- State Grid Sichuan Electric Power Company, No. 18, Jiaozi North Second Road, Chengdu, 610041, China
| | - Yongli Shi
- China Southern Power Grid Company Limited, No. 137, Guanshan West Road, Guiyang, 550081, China
| | - Fu Wan
- State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, No. 174, Shazheng Street, Chongqing, 400044, China
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16
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Rapid Raman Spectroscopic Analysis of Stress Induced Degradation of the Pharmaceutical Drug Tetracycline. Molecules 2020; 25:molecules25081866. [PMID: 32316681 PMCID: PMC7221697 DOI: 10.3390/molecules25081866] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/07/2020] [Accepted: 04/08/2020] [Indexed: 12/14/2022] Open
Abstract
Stress factors caused by inadequate storage can induce the unwanted degradation of active compounds in pharmaceutical formulations. Resonance Raman spectroscopy is presented as an analytical tool for rapid monitoring of small concentration changes of tetracycline and the metabolite 4˗epianhydrotetracycline. These degradation processes were experimentally induced by changes in temperature, humidity, and irradiation with visible light over a time period of up to 23 days. The excitation wavelength λexc = 413 nm was proven to provide short acquisition times for the simultaneous Raman spectroscopic detection of the degradation of tetracycline and production of its impurity in small sample volumes. Small concentration changes could be detected (down to 1.4% for tetracycline and 0.3% for 4-epianhydrotetracycline), which shows the potential of resonance Raman spectroscopy for analyzing the decomposition of pharmaceutical products.
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17
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Patel J, Cai R, Milton R, Chen H, Minteer SD. Pyrene‐Based Noncovalent Immobilization of Nitrogenase on Carbon Surfaces. Chembiochem 2020; 21:1729-1732. [DOI: 10.1002/cbic.201900697] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Janki Patel
- Department of Chemistry University of Utah 315 S 1400 E Salt Lake City UT 84112 USA
| | - Rong Cai
- Department of Chemistry University of Utah 315 S 1400 E Salt Lake City UT 84112 USA
| | - Ross Milton
- Department of Inorganic and Analytical Chemistry University of Geneva, Sciences II Quai Ernest-Ansermet 30 1211 Geneva 4 Switzerland
| | - Hui Chen
- Department of Chemistry University of Utah 315 S 1400 E Salt Lake City UT 84112 USA
| | - Shelley D. Minteer
- Department of Chemistry University of Utah 315 S 1400 E Salt Lake City UT 84112 USA
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18
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Wolf S, Frosch T, Popp J, Pletz MW, Frosch T. Highly Sensitive Detection of the Antibiotic Ciprofloxacin by Means of Fiber Enhanced Raman Spectroscopy. Molecules 2019; 24:molecules24244512. [PMID: 31835489 PMCID: PMC6943513 DOI: 10.3390/molecules24244512] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 12/05/2019] [Accepted: 12/06/2019] [Indexed: 12/13/2022] Open
Abstract
Sepsis and septic shock exhibit a rapid course and a high fatality rate. Antibiotic treatment is time-critical and precise knowledge of the antibiotic concentration during the patients’ treatment would allow individual dose adaption. Over- and underdosing will increase the antimicrobial efficacy and reduce toxicity. We demonstrated that fiber enhanced Raman spectroscopy (FERS) can be used to detect very low concentrations of ciprofloxacin in clinically relevant doses, down to 1.5 µM. Fiber enhancement was achieved in bandgap shifted photonic crystal fibers. The high linearity between the Raman signals and the drug concentrations allows a robust calibration for drug quantification. The needed sample volume was very low (0.58 µL) and an acquisition time of 30 s allowed the rapid monitoring of ciprofloxacin levels in a less invasive way than conventional techniques. These results demonstrate that FERS has a high potential for clinical in-situ monitoring of ciprofloxacin levels.
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Affiliation(s)
- Sebastian Wolf
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Timea Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Juergen Popp
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
- Institute of Physical Chemistry, Friedrich Schiller University, 07743 Jena, Germany
- Abbe Center of Photonics, Friedrich Schiller University, 07745 Jena, Germany
| | - Mathias W. Pletz
- Institute of Infectious Diseases and Infection Control, University Hospital, 07747 Jena, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
- Institute of Physical Chemistry, Friedrich Schiller University, 07743 Jena, Germany
- Abbe Center of Photonics, Friedrich Schiller University, 07745 Jena, Germany
- Correspondence: or
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19
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Frosch T, Wyrwich E, Yan D, Popp J, Frosch T. Fiber-Array-Based Raman Hyperspectral Imaging for Simultaneous, Chemically-Selective Monitoring of Particle Size and Shape of Active Ingredients in Analgesic Tablets. Molecules 2019; 24:E4381. [PMID: 31801249 PMCID: PMC6930444 DOI: 10.3390/molecules24234381] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 11/17/2019] [Accepted: 11/28/2019] [Indexed: 11/20/2022] Open
Abstract
The particle shape, size and distribution of active pharmaceutical ingredients (API) are relevant quality indicators of pharmaceutical tablets due to their high impact on the manufacturing process. Furthermore, the bioavailability of the APIs from the dosage form depends largely on these characteristics. Routinely, particle size and shape are only analyzed in the powder form, without regard to the effect of the formulation procedure on the particle characteristics. The monitoring of these parameters improves the understanding of the process; therefore, higher quality and better control over the biopharmaceutical profile can be ensured. A new fiber-array-based Raman hyperspectral imaging technique is presented for direct simultaneous in-situ monitoring of three different active pharmaceutical ingredients- acetylsalicylic acid, acetaminophen and caffeine- in analgesic tablets. This novel method enables a chemically selective, noninvasive assessment of the distribution of the active ingredients down to 1 µm spatial resolution. The occurrence of spherical and needle-like particles, as well as agglomerations and the respective particle size ranges, were rapidly determined for two commercially available analgesic tablet types. Subtle differences were observed in comparison between these two tablets. Higher amounts of acetaminophen were visible, more needle-shaped and bigger acetylsalicylic acid particles, and a higher incidence of bigger agglomerations were found in one of the analgesic tablets.
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Affiliation(s)
- Timea Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany; (T.F.); (E.W.); (D.Y.); (J.P.)
| | - Elisabeth Wyrwich
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany; (T.F.); (E.W.); (D.Y.); (J.P.)
| | - Di Yan
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany; (T.F.); (E.W.); (D.Y.); (J.P.)
| | - Juergen Popp
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany; (T.F.); (E.W.); (D.Y.); (J.P.)
- Institute of Physical Chemistry, Friedrich Schiller University, 07743 Jena, Germany
- Abbe Centre of Photonics, Friedrich Schiller University, 07745 code Jena, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany; (T.F.); (E.W.); (D.Y.); (J.P.)
- Institute of Physical Chemistry, Friedrich Schiller University, 07743 Jena, Germany
- Abbe Centre of Photonics, Friedrich Schiller University, 07745 code Jena, Germany
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20
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Le VH, Caumon MC, Tarantola A, Randi A, Robert P, Mullis J. Quantitative Measurements of Composition, Pressure, and Density of Microvolumes of CO2–N2 Gas Mixtures by Raman Spectroscopy. Anal Chem 2019; 91:14359-14367. [DOI: 10.1021/acs.analchem.9b02803] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Van-Hoan Le
- Université de Lorraine, CNRS, GeoResssources Laboratory, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
| | - Marie-Camille Caumon
- Université de Lorraine, CNRS, GeoResssources Laboratory, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
| | - Alexandre Tarantola
- Université de Lorraine, CNRS, GeoResssources Laboratory, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
| | - Aurélien Randi
- Université de Lorraine, CNRS, GeoResssources Laboratory, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
| | - Pascal Robert
- Université de Lorraine, CNRS, GeoResssources Laboratory, BP 70239, F-54506 Vandoeuvre-lès-Nancy, France
| | - Josef Mullis
- Mineralogisch-Petrographisches Institut, Bernoullistrasse 30, CH-4056 Basel, Switzerland
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21
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Metcalfe GD, Alahmari S, Smith TW, Hippler M. Cavity-Enhanced Raman and Helmholtz Resonator Photoacoustic Spectroscopy to Monitor the Mixed Sugar Metabolism of E. coli. Anal Chem 2019; 91:13096-13104. [PMID: 31525022 PMCID: PMC7006961 DOI: 10.1021/acs.analchem.9b03284] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
![]()
We
introduce and compare two powerful new techniques for headspace
gas analysis above bacterial batch cultures by spectroscopy, Raman
spectroscopy enhanced in an optical cavity (CERS), and photoacoustic
detection in a differential Helmholtz resonator (DHR). Both techniques
are able to monitor O2 and CO2 and its isotopomers
with excellent sensitivity and time resolution to characterize bacterial
growth and metabolism. We discuss and show some of the shortcomings
of more conventional optical density (OD) measurements if used on
their own without more sophisticated complementary measurements. The
spectroscopic measurements can clearly and unambiguously distinguish
the main phases of bacterial growth in the two media studied, LB and
M9. We demonstrate how 13C isotopic labeling of sugars
combined with spectroscopic detection allows the study of bacterial
mixed sugar metabolism to establish whether sugars are sequentially
or simultaneously metabolized. For E. coli, we have
characterized the shift from glucose to lactose metabolism without
a classic diauxic lag phase. DHR and CERS are shown to be cost-effective
and highly selective analytical tools in the biosciences and in biotechnology,
complementing and superseding existing conventional techniques. They
also provide new capabilities for mechanistic investigations and show
a great deal of promise for use in stable isotope bioassays.
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Affiliation(s)
- George D Metcalfe
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K
| | - Saeed Alahmari
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K
| | - Thomas W Smith
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K.,Water and Environmental Engineering Group, Faculty of Engineering and Physical Sciences , University of Southampton , Southampton SO17 1BJ , U.K
| | - Michael Hippler
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K
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22
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Sieburg A, Knebl A, Jacob JM, Frosch T. Characterization of fuel gases with fiber-enhanced Raman spectroscopy. Anal Bioanal Chem 2019; 411:7399-7408. [DOI: 10.1007/s00216-019-02145-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 08/19/2019] [Accepted: 09/06/2019] [Indexed: 12/15/2022]
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23
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Frosch T, Wyrwich E, Yan D, Domes C, Domes R, Popp J, Frosch T. Counterfeit and Substandard Test of the Antimalarial Tablet Riamet ® by Means of Raman Hyperspectral Multicomponent Analysis. Molecules 2019; 24:molecules24183229. [PMID: 31491881 PMCID: PMC6767462 DOI: 10.3390/molecules24183229] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 08/31/2019] [Accepted: 09/02/2019] [Indexed: 02/06/2023] Open
Abstract
The fight against counterfeit pharmaceuticals is a global issue of utmost importance, as failed medication results in millions of deaths every year. Particularly affected are antimalarial tablets. A very important issue is the identification of substandard tablets that do not contain the nominal amounts of the active pharmaceutical ingredient (API), and the differentiation between genuine products and products without any active ingredient or with a false active ingredient. This work presents a novel approach based on fiber-array based Raman hyperspectral imaging to qualify and quantify the antimalarial APIs lumefantrine and artemether directly and non-invasively in a tablet in a time-efficient way. The investigations were carried out with the antimalarial tablet Riamet® and self-made model tablets, which were used as examples of counterfeits and substandard. Partial least-squares regression modeling and density functional theory calculations were carried out for quantification of lumefantrine and artemether and for spectral band assignment. The most prominent differentiating vibrational signatures of the APIs were presented.
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Affiliation(s)
- Timea Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | | | - Di Yan
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Christian Domes
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Robert Domes
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Juergen Popp
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
- Friedrich Schiller University, Institute of Physical Chemistry, 07745 Jena, Germany
- Friedrich Schiller University, Abbe Centre of Photonics, 07745 Jena, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany.
- Friedrich Schiller University, Institute of Physical Chemistry, 07745 Jena, Germany.
- Friedrich Schiller University, Abbe Centre of Photonics, 07745 Jena, Germany.
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24
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Bytnerowicz TA, Min E, Griffin KL, Menge DNL. Repeatable, continuous and real‐time estimates of coupled nitrogenase activity and carbon exchange at the whole‐plant scale. Methods Ecol Evol 2019. [DOI: 10.1111/2041-210x.13186] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thomas A. Bytnerowicz
- Department of Ecology, Evolution and Environmental Biology Columbia University New York NY
| | - Elizabeth Min
- Department of Earth and Environmental Sciences Columbia University Palisades NY
| | - Kevin L. Griffin
- Department of Ecology, Evolution and Environmental Biology Columbia University New York NY
- Department of Earth and Environmental Sciences Columbia University Palisades NY
| | - Duncan N. L. Menge
- Department of Ecology, Evolution and Environmental Biology Columbia University New York NY
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25
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Knebl A, Domes R, Yan D, Popp J, Trumbore S, Frosch T. Fiber-Enhanced Raman Gas Spectroscopy for 18O- 13C-Labeling Experiments. Anal Chem 2019; 91:7562-7569. [PMID: 31050402 DOI: 10.1021/acs.analchem.8b05684] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Stable isotopes are used in ecology to track and disentangle different processes and pathways. Especially for studies focused on the gas exchange of plants, sensing techniques that offer oxygen (O2) and carbon dioxide (CO2) sensitivity with isotopic discrimination are highly sought after. Addressing this challenge, fiber-enhanced Raman gas spectroscopy is introduced as a fast optical technique directly combining 13CO2 and 12CO2 as well as 18O2 and 16O2 measurements in one instrument. We demonstrate how a new type of optical hollow-core fiber, the so-called revolver fiber, is utilized for enhanced Raman gas sensing. Carbon dioxide and oxygen isotopologues were measured at concentrations expected when using 13C- and 18O-labeled gases in plant experiments. Limits of detection have been determined to be 25 ppm for CO2 and 150 ppm for O2. The combination of measurements with different integration times allows the creation of highly resolved broadband spectra. With the help of calculations based on density functional theory, the line at 1512 cm-1 occurring in the oxygen spectrum is assigned to 18O16O. The relative abundances of the isotopologues 18O16O and nitrogen 15N14N were in good agreement with typical values. For CO2, fiber-enhanced Raman spectra show the Fermi diad and hotbands of 12C16O2, 13C16O2, and 12C18O16O. Several weak lines were observed, and the line at 1426 cm-1 was identified as originating from the (0 4 0 2) → (0 2 0 2) transition of 12C16O2. With the demonstrated sensitivity and discriminatory power, fiber-enhanced Raman spectroscopy is a possible alternative means to investigate plant metabolism, directly combining 13CO2 and 12CO2 measurements with 18O2 and 16O2 measurements in one instrument. The presented method thus has large potential for basic analytical investigations as well as for applications in the environmental sciences.
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Affiliation(s)
- Andreas Knebl
- Leibniz Institute of Photonic Technology , 07745 Jena , Germany.,Max-Planck-Institute for Biogeochemistry , 07745 Jena , Germany
| | - Robert Domes
- Leibniz Institute of Photonic Technology , 07745 Jena , Germany
| | - Di Yan
- Leibniz Institute of Photonic Technology , 07745 Jena , Germany
| | - Juergen Popp
- Leibniz Institute of Photonic Technology , 07745 Jena , Germany.,Institute of Physical Chemistry & Abbe Center of Photonics , Friedrich Schiller University , 07743 Jena , Germany
| | - Susan Trumbore
- Max-Planck-Institute for Biogeochemistry , 07745 Jena , Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology , 07745 Jena , Germany.,Institute of Physical Chemistry & Abbe Center of Photonics , Friedrich Schiller University , 07743 Jena , Germany
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26
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Weller L, Kuvshinov M, Hochgreb S. Gas-phase Raman spectroscopy of non-reacting flows: comparison between free-space and cavity-based spontaneous Raman emission. APPLIED OPTICS 2019; 58:C92-C103. [PMID: 31045056 DOI: 10.1364/ao.58.000c92] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 03/06/2019] [Indexed: 06/09/2023]
Abstract
We report on a comparison of free-space and cavity-enhanced Raman spectroscopy for gas-phase measurements of nitrogen and oxygen in ambient air. Real-time analysis capabilities and continuous Raman signals with low power diodes make the technique non-invasive, affordable, compact, and applicable for usage in non-reacting flows. We derive a comprehensive model for estimation of photon emission for both free-space and cavity-based signals and discuss trade-offs in how to organize the cavity geometry for maximum gain relative to free space. Measurements in both free and cavity configurations are compared to the expected signals, demonstrating the usefulness of the model in predicting amplification. The present results can serve as a quick guide on how to use low-power continuous wave lasers in a cavity setup to obtain enhanced laser-induced spontaneous Raman scattering.
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27
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Yan D, Frosch T, Kobelke J, Bierlich J, Popp J, Pletz MW, Frosch T. Fiber-Enhanced Raman Sensing of Cefuroxime in Human Urine. Anal Chem 2018; 90:13243-13248. [PMID: 30387601 DOI: 10.1021/acs.analchem.8b01355] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Fiber-enhanced Raman spectroscopy was developed for the chemically selective and sensitive quantification of the important antibiotic cefuroxime in human urine. A novel optical sensor fiber was drawn and precisely prepared. In this fiber structure, light is strongly confined in the selectively filled liquid core, and the Raman scattered signal is collected with unprecedented efficiency over an extended interaction length. The filling, emptying, and robustness are highly improved due to the large core size (>30 μm). Broadband step-index guidance allows the free choice of the most suitable excitation wavelength in complex body fluids. The limit of detection of cefuroxime in human urine was improved by 2 orders of magnitude (to μM level). The quantification of cefuroxime was achieved in urine after oral administration. This method has great potential for the point-of-care monitoring of antibiotics concentrations and is an important step forward to enable clinicians to rapidly adjust doses.
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Affiliation(s)
- Di Yan
- Leibniz Institute of Photonic Technology , Jena 07745 , Germany
| | - Timea Frosch
- Leibniz Institute of Photonic Technology , Jena 07745 , Germany
| | - Jens Kobelke
- Leibniz Institute of Photonic Technology , Jena 07745 , Germany
| | - Jörg Bierlich
- Leibniz Institute of Photonic Technology , Jena 07745 , Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology , Jena 07745 , Germany.,Friedrich Schiller University , Institute of Physical Chemistry , Jena 07743 , Germany.,Friedrich Schiller University , Abbe Centre of Photonics , Jena 07745 , Germany
| | - Mathias W Pletz
- Center for Infectious Diseases and Infection Control , Jena University Hospital , Jena 07740 , Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology , Jena 07745 , Germany.,Friedrich Schiller University , Institute of Physical Chemistry , Jena 07743 , Germany.,Friedrich Schiller University , Abbe Centre of Photonics , Jena 07745 , Germany
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28
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Sieburg A, Jochum T, Trumbore SE, Popp J, Frosch T. Onsite cavity enhanced Raman spectrometry for the investigation of gas exchange processes in the Earth's critical zone. Analyst 2018; 142:3360-3369. [PMID: 28853462 DOI: 10.1039/c7an01149k] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Raman gas spectrometry is introduced as a robust, versatile method for onsite, battery-powered field measurements of gases in the unsaturated and saturated critical zone. In this study, depth-profiles of the concentrations of oxygen and carbon dioxide were simultaneously monitored down to ∼70 meters depth in the subsurface via a transect of drilling holes located in the Hainich Critical Zone Exploratory in central Germany. A special multichannel monitoring system was designed to access and analyze these gases non-consumptively onsite in a closed loop measurement cycle. During the timeframe of six months, seasonal changes in groundwater levels and microbial activity were related to changes observed in gas concentrations. High oxygen concentrations were found in the depths surrounding a karstified aquifer complex, while low oxygen concentrations were found in a fractured aquifer complex. Raman gas depth-profiles complement standard dissolved oxygen measurements as they also deliver oxygen concentrations in the unsaturated zone. The measured depth-profiles of the gas concentrations indicated that regions of anoxia can exist between the aquifer complexes. Lateral transport of O2 in the deeper aquifer complex provides a local source of O2 that can influence metabolism. Correlations were found between the observed CO2 concentrations and pH-values, indicating strong control of carbonate equilibria. The concentrations of O2 and CO2 were largely decoupled, thus simultaneous measurements of O2 soil effluxes give additional insights into biotic and abiotic processes in the Hainich CZE. These results illustrate the versatility of robust onsite Raman multigas measurements of the soil atmosphere and how they can contribute to the analysis of complex processes in previous uncharacterized environments in the critical zone.
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Affiliation(s)
- Anne Sieburg
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany.
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29
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Kumar S, Herrmann M, Blohm A, Hilke I, Frosch T, Trumbore SE, Küsel K. Thiosulfate- and hydrogen-driven autotrophic denitrification by a microbial consortium enriched from groundwater of an oligotrophic limestone aquifer. FEMS Microbiol Ecol 2018; 94:5056153. [DOI: 10.1093/femsec/fiy141] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 07/18/2018] [Indexed: 01/17/2023] Open
Affiliation(s)
- Swatantar Kumar
- Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University Jena, Dornburger Strasse 159, D-07743 Jena, Germany
- Max Planck Institute for Biogeochemistry, Hans-Knöll-Strasse 10, D-07745 Jena, Germany
| | - Martina Herrmann
- Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University Jena, Dornburger Strasse 159, D-07743 Jena, Germany
- German Center for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103 Leipzig, Germany
| | - Annika Blohm
- Max Planck Institute for Biogeochemistry, Hans-Knöll-Strasse 10, D-07745 Jena, Germany
- Leibniz Institute of Photonic Technology, Albert-Einstein-Strasse 9, D-07745 Jena, Germany
| | - Ines Hilke
- Max Planck Institute for Biogeochemistry, Hans-Knöll-Strasse 10, D-07745 Jena, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, Albert-Einstein-Strasse 9, D-07745 Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Albert-Einstein-Strasse 6, D-07745, Jena, Germany
| | - Susan E Trumbore
- Max Planck Institute for Biogeochemistry, Hans-Knöll-Strasse 10, D-07745 Jena, Germany
| | - Kirsten Küsel
- Aquatic Geomicrobiology, Institute of Biodiversity, Friedrich Schiller University Jena, Dornburger Strasse 159, D-07743 Jena, Germany
- German Center for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103 Leipzig, Germany
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30
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31
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Cui L, Yang K, Li HZ, Zhang H, Su JQ, Paraskevaidi M, Martin FL, Ren B, Zhu YG. Functional Single-Cell Approach to Probing Nitrogen-Fixing Bacteria in Soil Communities by Resonance Raman Spectroscopy with 15N 2 Labeling. Anal Chem 2018; 90:5082-5089. [PMID: 29557648 DOI: 10.1021/acs.analchem.7b05080] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Nitrogen (N) fixation is the conversion of inert nitrogen gas (N2) to bioavailable N essential for all forms of life. N2-fixing microorganisms (diazotrophs), which play a key role in global N cycling, remain largely obscure because a large majority are uncultured. Direct probing of active diazotrophs in the environment is still a major challenge. Herein, a novel culture-independent single-cell approach combining resonance Raman (RR) spectroscopy with 15N2 stable isotope probing (SIP) was developed to discern N2-fixing bacteria in a complex soil community. Strong RR signals of cytochrome c (Cyt c, frequently present in diverse N2-fixing bacteria), along with a marked 15N2-induced Cyt c band shift, generated a highly distinguishable biomarker for N2 fixation. 15N2-induced shift was consistent well with 15N abundance in cell determined by isotope ratio mass spectroscopy. By applying this biomarker and Raman imaging, N2-fixing bacteria in both artificial and complex soil communities were discerned and imaged at the single-cell level. The linear band shift of Cyt c versus 15N2 percentage allowed quantification of N2 fixation extent of diverse soil bacteria. This single-cell approach will advance the exploration of hitherto uncultured diazotrophs in diverse ecosystems.
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Affiliation(s)
- Li Cui
- Key Lab of Urban Environment and Health, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China
| | - Kai Yang
- Key Lab of Urban Environment and Health, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China.,University of Chinese Academy of Sciences , 19A Yuquan Road , Beijing 100049 , China
| | - Hong-Zhe Li
- Key Lab of Urban Environment and Health, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China.,University of Chinese Academy of Sciences , 19A Yuquan Road , Beijing 100049 , China
| | - Han Zhang
- Key Lab of Urban Environment and Health, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China
| | - Jian-Qiang Su
- Key Lab of Urban Environment and Health, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China
| | - Maria Paraskevaidi
- School of Pharmacy and Biomedical Sciences , University of Central Lancashire , Preston PR1 2HE , U.K
| | - Francis L Martin
- School of Pharmacy and Biomedical Sciences , University of Central Lancashire , Preston PR1 2HE , U.K
| | - Bin Ren
- Department of Chemistry , Xiamen University , Xiamen 361005 , China
| | - Yong-Guan Zhu
- Key Lab of Urban Environment and Health, Institute of Urban Environment , Chinese Academy of Sciences , Xiamen 361021 , China.,State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences , Chinese Academy of Sciences , Beijing 100085 , China
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32
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Sieburg A, Schneider S, Yan D, Popp J, Frosch T. Monitoring of gas composition in a laboratory biogas plant using cavity enhanced Raman spectroscopy. Analyst 2018; 143:1358-1366. [DOI: 10.1039/c7an01689a] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cavity-enhanced Raman spectroscopy is a powerful tool for online detection of multiple gases during the process of biogas production.
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Affiliation(s)
- Anne Sieburg
- Leibniz Institute of Photonic Technology
- 07745 Jena
- Germany
| | | | - Di Yan
- Leibniz Institute of Photonic Technology
- 07745 Jena
- Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology
- 07745 Jena
- Germany
- Friedrich Schiller University
- Institute of Physical Chemistry
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology
- 07745 Jena
- Germany
- Friedrich Schiller University
- Institute of Physical Chemistry
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33
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Yan D, Popp J, Frosch T. Analysis of Fiber-Enhanced Raman Gas Sensing Based on Raman Chemical Imaging. Anal Chem 2017; 89:12269-12275. [DOI: 10.1021/acs.analchem.7b03209] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Di Yan
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
- Friedrich Schiller University, Institute of Physical
Chemistry, 07743 Jena, Germany
- Friedrich Schiller University, Abbe Center of Photonics, 07745 Jena, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology, 07745 Jena, Germany
- Friedrich Schiller University, Institute of Physical
Chemistry, 07743 Jena, Germany
- Friedrich Schiller University, Abbe Center of Photonics, 07745 Jena, Germany
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34
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Domes C, Domes R, Popp J, Pletz MW, Frosch T. Ultrasensitive Detection of Antiseptic Antibiotics in Aqueous Media and Human Urine Using Deep UV Resonance Raman Spectroscopy. Anal Chem 2017; 89:9997-10003. [PMID: 28840713 DOI: 10.1021/acs.analchem.7b02422] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Deep UV resonance Raman spectroscopy is introduced as an analytical tool for ultrasensitive analysis of antibiotics used for empirical treatment of patients with sepsis and septic shock, that is, moxifloxacin, meropenem, and piperacillin in aqueous solution and human urine. By employing the resonant excitation wavelengths λexc = 244 nm and λexc = 257 nm, only a small sample volume and short acquisition times are needed. For a better characterization of the matrix urine, the main ingredients were investigated. The capability of detecting the antibiotics in clinically relevant concentrations in aqueous media (LODs: 13.0 ± 1.4 μM for moxifloxacin, 43.6 ± 10.7 μM for meropenem, and 7.1 ± 0.6 μM for piperacillin) and in urine (LODs: 36.6 ± 11.0 μM for moxifloxacin, and 114.8 ± 3.1 μM for piperacillin) points toward the potential of UV Raman spectroscopy as point-of-care method for therapeutic drug monitoring (TDM). This procedure enables physicians to achieve fast adequate dosing of antibiotics to improve the outcome of patients with sepsis.
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Affiliation(s)
- Christian Domes
- Leibniz Institute of Photonic Technology , Jena 07745, Germany
| | - Robert Domes
- Leibniz Institute of Photonic Technology , Jena 07745, Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology , Jena 07745, Germany.,Friedrich Schiller University , Institute for Physical Chemistry, Jena 07743, Germany.,Friedrich Schiller University , Abbe Centre of Photonics, Jena 07745, Germany
| | - Mathias W Pletz
- Center for Infectious Diseases and Infection Control, Jena University Hospital , Jena 07743, Germany
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology , Jena 07745, Germany.,Friedrich Schiller University , Institute for Physical Chemistry, Jena 07743, Germany.,Friedrich Schiller University , Abbe Centre of Photonics, Jena 07745, Germany
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35
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Domes R, Domes C, Albert CR, Bringmann G, Popp J, Frosch T. Vibrational spectroscopic characterization of arylisoquinolines by means of Raman spectroscopy and density functional theory calculations. Phys Chem Chem Phys 2017; 19:29918-29926. [DOI: 10.1039/c7cp05415g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Seven new AIQ antimalarial agents were investigated using FT-NIR and deep-UV resonance Raman spectroscopy.
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Affiliation(s)
- Robert Domes
- Leibniz Institute of Photonic Technology
- Jena
- Germany
| | | | | | - Gerhard Bringmann
- Julius-Maximilians University
- Institute of Organic Chemistry
- Würzburg
- Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology
- Jena
- Germany
- Friedrich Schiller University
- Institute for Physical Chemistry
| | - Torsten Frosch
- Leibniz Institute of Photonic Technology
- Jena
- Germany
- Friedrich Schiller University
- Institute for Physical Chemistry
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