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Cheredath A, Uppangala S, Jijo A, Lakshmi RV, Gowda GAN, Kalthur G, Adiga SK. Use of sensitivity-enhanced nuclear magnetic resonance spectroscopy equipped with a 1.7-mm cryogenically cooled micro-coil probe in identifying human sperm intracellular metabolites. Reprod Fertil Dev 2023; 35:661-668. [PMID: 37643634 DOI: 10.1071/rd22246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Accepted: 08/14/2023] [Indexed: 08/31/2023] Open
Abstract
CONTEXT The clinical value of human sperm metabolites has not been established due to the technical complexity in detecting these metabolites when sperm numbers are low. AIMS To detect endogenous intracellular metabolites in fresh and post-thaw human spermatozoa using 800MHz nuclear magnetic resonance (NMR) spectroscopy equipped with a 1.7-mm cryo-probe. METHODS Processed spermatozoa from 25 normozoospermic ejaculates were subjected to extraction of intracellular metabolites and then profiled by sensitivity-enhanced NMR spectroscopy equipped with a 1.7-mm cryogenically cooled micro-coil probe. In parallel, some of the processed sperm fractions were subjected to freeze-thawing and were then analysed for intracellular metabolites. KEY RESULTS Twenty-three metabolites were profiled from only 1.25million sperm cells. Comparison of the metabolomic signature of pre-freeze and post-thaw sperm cells did not show significant changes in the levels of metabolites. CONCLUSIONS Sensitivity-enhanced NMR spectroscopy equipped with a 1.7-mm cryogenically cooled micro-coil probe is a potential tool for identifying intracellular metabolites when sperm number is low. IMPLICATIONS Use of sensitivity-enhanced NMR spectroscopy opens up the opportunity to test for endogenous metabolites in samples with a limited number of spermatozoa, to understand the patho-physiology of infertility.
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Affiliation(s)
- Aswathi Cheredath
- Centre of Excellence in Clinical Embryology, Department of Reproductive Science, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576 104, India
| | - Shubhashree Uppangala
- Division of Reproductive Genetics, Department of Reproductive Science, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576 104, India
| | - Ameya Jijo
- Centre of Excellence in Clinical Embryology, Department of Reproductive Science, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576 104, India
| | - R Vani Lakshmi
- Department of Data Science, Prasanna School of Public Health, Manipal Academy of Higher Education, Manipal 576 104, India
| | - G A Nagana Gowda
- Northwest Metabolomics Research Centre, Anaesthesiology and Pain Medicine, University of Washington, Seattle, WA, USA
| | - Guruprasad Kalthur
- Division of Reproductive Biology, Department of Reproductive Science, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576 104, India
| | - Satish Kumar Adiga
- Centre of Excellence in Clinical Embryology, Department of Reproductive Science, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576 104, India
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Wong A. A roadmap to high-resolution standard microcoil MAS NMR spectroscopy for metabolomics. NMR IN BIOMEDICINE 2023; 36:e4683. [PMID: 34970795 DOI: 10.1002/nbm.4683] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 12/06/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
Current microcoil probe technology has emerged as a significant advancement in NMR applications to biofluids research. It has continued to excel as a hyphenated tool with other prominent microdevices, opening many new possibilities in multiple omics fields. However, this does not hold for biological samples such as intact tissue or organisms, due to the considerable challenges of incorporating the microcoil in a magic-angle spinning (MAS) probe without relinquishing the high-resolution spectral data. Not until 2012 did a microcoil MAS probe show promise in profiling the metabolome in a submilligram tissue biopsy with spectral resolution on par with conventional high-resolution MAS (HR-MAS) NMR. This result subsequently triggered a great interest in the possibility of NMR analysis with microgram tissues and striving toward the probe development of "high-resolution" capable microcoil MAS NMR spectroscopy. This review gives an overview of the issues and challenges in the probe development and summarizes the advancements toward metabolomics.
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Affiliation(s)
- Alan Wong
- NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, Gif-sur-Yvette, France
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Asampille G, Cheredath A, Joseph D, Adiga SK, Atreya HS. The utility of nuclear magnetic resonance spectroscopy in assisted reproduction. Open Biol 2020; 10:200092. [PMID: 33142083 PMCID: PMC7729034 DOI: 10.1098/rsob.200092] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 10/13/2020] [Indexed: 12/21/2022] Open
Abstract
Infertility affects approximately 15-20% of individuals of reproductive age worldwide. Over the last 40 years, assisted reproductive technology (ART) has helped millions of childless couples. However, ART is limited by a low success rate and risk of multiple gestations. Devising methods for selecting the best gamete or embryo that increases the ART success rate and prevention of multiple gestation has become one of the key goals in ART today. Special emphasis has been placed on the development of non-invasive approaches, which do not require perturbing the embryonic cells, as the current morphology-based embryo selection approach has shortcomings in predicting the implantation potential of embryos. An observed association between embryo metabolism and viability has prompted researchers to develop metabolomics-based biomarkers. Nuclear magnetic resonance (NMR) spectroscopy provides a non-invasive approach for the metabolic profiling of tissues, gametes and embryos, with the key advantage of having a minimal sample preparation procedure. Using NMR spectroscopy, biologically important molecules can be identified and quantified in intact cells, extracts or secretomes. This, in turn, helps to map out the active metabolic pathways in a system. The present review covers the contribution of NMR spectroscopy in assisted reproduction at various stages of the process.
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Affiliation(s)
- Gitanjali Asampille
- Department of Clinical Embryology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576104, India
| | - Aswathi Cheredath
- Department of Clinical Embryology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576104, India
| | - David Joseph
- NMR Research Centre, Indian Institute of Science, Bangalore 560012, India
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Satish K. Adiga
- Department of Clinical Embryology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education, Manipal 576104, India
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Tiwari R, Ahire D, Kumar H, Sinha S, Chauthe SK, Subramanian M, Iyer R, Sarabu R, Bajpai L. Use of Hybrid Capillary Tube Apparatus on 400 MHz NMR for Quantitation of Crucial Low-Quantity Metabolites Using aSICCO Signal. Drug Metab Dispos 2017; 45:1215-1224. [PMID: 28935657 DOI: 10.1124/dmd.117.077073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 09/13/2017] [Indexed: 11/22/2022] Open
Abstract
Metabolites of new chemical entities can influence safety and efficacy of a molecule and often times need to be quantified in preclinical studies. However, synthetic standards of metabolites are very rarely available in early discovery. Alternate approaches such as biosynthesis need to be explored to generate these metabolites. Assessing the quantity and purity of these small amounts of metabolites with a nondestructive analytical procedure becomes crucial. Quantitative NMR becomes the method of choice for these samples. Recent advances in high-field NMR (>500 MHz) with the use of cryoprobe technology have helped to improve sensitivity for analysis of small microgram quantity of such samples. However, this type of NMR instrumentation is not routinely available in all laboratories. To analyze microgram quantities of metabolites on a routine basis with lower-resolution 400 MHz NMR instrument fitted with a broad band fluorine observe room temperature probe, a novel hybrid capillary tube setup was developed. To quantitate the metabolite in the sample, an artificial signal insertion for calculation of concentration observed (aSICCO) method that introduces an internally calibrated mathematical signal was used after acquiring the NMR spectrum. The linearity of aSICCO signal was established using ibuprofen as a model analyte. The limit of quantification of this procedure was 0.8 mM with 10 K scans that could be improved further with the increase in the number of scans. This procedure was used to quantify three metabolites-phenytoin from fosphenytoin, dextrophan from dextromethorphan, and 4-OH-diclofenac from diclofenac-and is suitable for minibiosynthesis of metabolites from in vitro systems.
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Affiliation(s)
- Ranjeet Tiwari
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Deepak Ahire
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Hemantha Kumar
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Sarmistha Sinha
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Siddheshwar Kisan Chauthe
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Murali Subramanian
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Ramaswamy Iyer
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Ramakanth Sarabu
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
| | - Lakshmikant Bajpai
- Discovery Analytical Sciences (R.T., H.K., S.K.C., R.S., L.B.) and Pharmaceutical Candidate Optimization (D.A., S.S., M.S.), Bristol-Myers Squibb-Biocon Research Center, Bangalore, India; and Pharmaceutical Candidate Optimization, Bristol-Myers Squibb, Princeton, New Jersey (R.I.)
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Duong NT, Yamato M, Nakano M, Kume S, Tamura Y, Kataoka Y, Wong A, Nishiyama Y. Capillary-Inserted Rotor Design for HRµMASNMR-Based Metabolomics on Mass-Limited Neurospheres. Molecules 2017; 22:E1289. [PMID: 28771206 PMCID: PMC6152061 DOI: 10.3390/molecules22081289] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2017] [Accepted: 07/30/2017] [Indexed: 11/17/2022] Open
Abstract
Nuclear magnetic resonance (NMR) spectroscopy is a powerful analytical technique and has been widely used in metabolomics. However, the intrinsic low sensitivity of NMR prevents its applications to systems with limited sample availabilities. In this study, a new experimental approach is presented to analyze mass-scarce samples in limited volumes of less than 300 nL with simple handling. The sample is loaded into the glass capillary, and this capillary is then inserted into a Kel-F rotor. The experimental performance of the capillary-inserted rotor (capillary-insert) is investigated on an isotropic solution of sucrose by the use of a high-resolution micro-sized magic angle spinning (HRµMAS) probe. The acquired NMR signal's sensitivity to a given sample amount is comparable or even higher in comparison to that recorded by the standard solution NMR probe. More importantly, this capillary-insert coupled with the HRµMAS probe allows in-depth studies of heterogeneous samples as the MAS removes the line broadening caused by the heterogeneity. The NMR analyses of mass-limited cultured neurospheres have been demonstrated, resulting in high quality spectra where numerous metabolites are unambiguously identified.
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Affiliation(s)
- Nghia Tuan Duong
- Advanced Solid-State NMR Unit, RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan.
| | - Masanori Yamato
- Multi-Modal Microstructure Analysis Unit, RIKEN CLST-JEOL Collaboration Center, RIKEN, Kobe, Hyogo 650-0047, Japan.
- Cellular Function Imaging Team, RIKEN Center for Life Science Technologies, Kobe, Hyogo 650-0047, Japan.
| | - Masayuki Nakano
- Cellular Function Imaging Team, RIKEN Center for Life Science Technologies, Kobe, Hyogo 650-0047, Japan.
- Department of Physiology, Osaka City University Graduate School of Medicine, Abeno-ku, Osaka 545-8585, Japan.
| | - Satoshi Kume
- Multi-Modal Microstructure Analysis Unit, RIKEN CLST-JEOL Collaboration Center, RIKEN, Kobe, Hyogo 650-0047, Japan.
- Cellular Function Imaging Team, RIKEN Center for Life Science Technologies, Kobe, Hyogo 650-0047, Japan.
| | - Yasuhisa Tamura
- Multi-Modal Microstructure Analysis Unit, RIKEN CLST-JEOL Collaboration Center, RIKEN, Kobe, Hyogo 650-0047, Japan.
- Cellular Function Imaging Team, RIKEN Center for Life Science Technologies, Kobe, Hyogo 650-0047, Japan.
| | - Yosky Kataoka
- Multi-Modal Microstructure Analysis Unit, RIKEN CLST-JEOL Collaboration Center, RIKEN, Kobe, Hyogo 650-0047, Japan.
- Cellular Function Imaging Team, RIKEN Center for Life Science Technologies, Kobe, Hyogo 650-0047, Japan.
- Department of Physiology, Osaka City University Graduate School of Medicine, Abeno-ku, Osaka 545-8585, Japan.
| | - Alan Wong
- NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France.
| | - Yusuke Nishiyama
- Advanced Solid-State NMR Unit, RIKEN CLST-JEOL Collaboration Center, RIKEN, Yokohama, Kanagawa 230-0045, Japan.
- Engineering Division, JEOL RESONANCE Inc., Musashino, Akishima, Tokyo 196-8558, Japan.
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Di Tullio V, Capitani D, Atrei A, Benetti F, Perra G, Presciutti F, Proietti N, Marchettini N. Advanced NMR methodologies and micro-analytical techniques to investigate the stratigraphy and materials of 14th century Sienese wooden paintings. Microchem J 2016. [DOI: 10.1016/j.microc.2015.11.036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Guo W, Jin M, Miao Z, Qu K, Liu X, Zhang P, Qin H, Zhu H, Wang Y. Structure Elucidation of the Metabolites of 2', 3', 5'-Tri-O-Acetyl-N6-(3-Hydroxyphenyl) Adenosine in Rat Urine by HPLC-DAD, ESI-MS and Off-Line Microprobe NMR. PLoS One 2015; 10:e0127583. [PMID: 26029929 PMCID: PMC4451981 DOI: 10.1371/journal.pone.0127583] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 04/16/2015] [Indexed: 11/19/2022] Open
Abstract
2', 3', 5'-Tri-O-acetyl-N6-(3-hydroxyphenyl) adenosine (also known as WS070117) is a new adenosine analog that displays anti-hyperlipidemic activity both in vitro and in vivo experiments as shown in many preliminary studies. Due to its new structure, little is known about the metabolism of WS070117. Hence, the in vivo metabolites of WS070117 in rat urine following oral administration were investigated. Identification of the metabolites was conducted using the combination of high-performance liquid chromatography (HPLC) coupled with diode array detector (DAD), ion trap electrospray ionization-mass spectrometry (ESI-MS), and off-line microprobe nuclear magnetic resonance (NMR) measurements. Seven metabolites were obtained as pure compounds at the sub-milligram to milligram levels. Results of structure elucidation unambiguously revealed that the phase I metabolite, N6-(3-hydroxyphenyl) adenosine (M8), was a hydrolysate of WS070117 by hydrolysis on the three ester groups. N6-(3-hydr-oxyphenyl) adenine (M7), also one of the phase I metabolites, was the derivative of M8 by the loss of ribofuranose. In addition to two phase I metabolites, there were five phase II metabolites of WS070117 found in rat urine. 8-hydroxy-N6-(3-hydroxy-phenyl) adenosine (M6) was the product of M7 by hydrolysis at position 8. The other four were elucidated to be N6-(3-O-β-D-glucuronyphenyl) adenine (M2), N8-hydroxy-N6-(3-O-sulfophenyl) adenine (M3), N6-(3-O-β-D-glucuronyphenyl) adenosine (M4), and N6-(3-O- sulfophenyl) adenosine (M5). Phase II metabolic pathways were proven to consist of hydroxylation, glucuronidation and sulfation. This study provides new and valuable information on the metabolism of WS070117, and also demonstrates the HPLC/MS/off-line microprobe NMR approach as a robust means for rapid identification of metabolites.
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Affiliation(s)
- Wei Guo
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Mengxia Jin
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Zhaoxia Miao
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Kai Qu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation Study, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xia Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Peicheng Zhang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Hailin Qin
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Haibo Zhu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Beijing Key Laboratory of New Drug Mechanisms and Pharmacological Evaluation Study, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yinghong Wang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines & Ministry of Health Key Laboratory of Biosynthesis of Natural Products, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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Zalesskiy SS, Danieli E, Blümich B, Ananikov VP. Miniaturization of NMR systems: desktop spectrometers, microcoil spectroscopy, and "NMR on a chip" for chemistry, biochemistry, and industry. Chem Rev 2014; 114:5641-94. [PMID: 24779750 DOI: 10.1021/cr400063g] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sergey S Zalesskiy
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Moscow, 119991, Russia
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Proietti N, Capitani D, Di Tullio V. Applications of nuclear magnetic resonance sensors to cultural heritage. SENSORS 2014; 14:6977-97. [PMID: 24755519 PMCID: PMC4029666 DOI: 10.3390/s140406977] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2014] [Revised: 04/08/2014] [Accepted: 04/15/2014] [Indexed: 11/24/2022]
Abstract
In recent years nuclear magnetic resonance (NMR) sensors have been increasingly applied to investigate, characterize and monitor objects of cultural heritage interest. NMR is not confined to a few specific applications, but rather its use can be successfully extended to a wide number of different cultural heritage issues. A breakthrough has surely been the recent development of portable NMR sensors which can be applied in situ for non-destructive and non-invasive investigations. In this paper three studies illustrating the potential of NMR sensors in this field of research are reported.
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Affiliation(s)
- Noemi Proietti
- Laboratorio di Risonanza Magnetica "Annalaura Segre", Istituto di Metodologie Chimiche, CNR Area della Ricerca di Roma 1, Via Salaria Km 29,300, 00015 Monterotondo (Rome), Italy.
| | - Donatella Capitani
- Laboratorio di Risonanza Magnetica "Annalaura Segre", Istituto di Metodologie Chimiche, CNR Area della Ricerca di Roma 1, Via Salaria Km 29,300, 00015 Monterotondo (Rome), Italy.
| | - Valeria Di Tullio
- Laboratorio di Risonanza Magnetica "Annalaura Segre", Istituto di Metodologie Chimiche, CNR Area della Ricerca di Roma 1, Via Salaria Km 29,300, 00015 Monterotondo (Rome), Italy.
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11
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Quantitative preparative gas chromatography of caffeine with nuclear magnetic resonance spectroscopy. J Sep Sci 2013; 36:1774-80. [DOI: 10.1002/jssc.201201081] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 02/11/2013] [Accepted: 03/05/2013] [Indexed: 11/07/2022]
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Mazumder A, Kumar A, Dubey DK. High resolution 19F{1H} nuclear magnetic resonance spectroscopy and liquid chromatography–solid phase extraction–offline 1H nuclear magnetic resonance spectroscopy for conclusive detection and identification of cyanide in water samples. J Chromatogr A 2013; 1284:88-99. [DOI: 10.1016/j.chroma.2013.02.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Revised: 01/31/2013] [Accepted: 02/01/2013] [Indexed: 10/27/2022]
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Koskela H. A set of triple-resonance nuclear magnetic resonance experiments for structural characterization of organophosphorus compounds in mixture samples. Anal Chim Acta 2012; 751:105-11. [PMID: 23084058 DOI: 10.1016/j.aca.2012.09.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 09/09/2012] [Accepted: 09/15/2012] [Indexed: 10/27/2022]
Abstract
The (1)H, (13)C correlation NMR spectroscopy utilizes J(CH) couplings in molecules, and provides important structural information from small organic molecules in the form of carbon chemical shifts and carbon-proton connectivities. The full potential of the (1)H, (13)C correlation NMR spectroscopy has not been realized in the Chemical Weapons Convention (CWC) related verification analyses due to the sample matrix, which usually contains a high amount of non-related compounds obscuring the correlations of the relevant compounds. Here, the results of the application of (1)H, (13)C, (31)P triple-resonance NMR spectroscopy in characterization of OP compounds related to the CWC are presented. With a set of two-dimensional triple-resonance experiments the J(HP), J(CH) and J(PC) couplings are utilized to map the connectivities of the atoms in OP compounds and to extract the carbon chemical shift information. With the use of the proposed pulse sequences the correlations from the OP compounds can be recorded without significant artifacts from the non-OP compound impurities in the sample. Further selectivity of the observed correlations is achieved with the application of phosphorus band-selective pulse in the pulse sequences to assist the analysis of multiple OP compounds in mixture samples. The use of the triple-resonance experiments in the analysis of a complex sample is shown with a test mixture containing typical scheduled OP compounds, including the characteristic degradation products of nerve agents sarin, soman, and VX. The viability of the approach in verification analysis is demonstrated in the analysis of the 30th OPCW Proficiency Test sample.
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Nadal-Desbarats L, Veau S, Blasco H, Emond P, Royere D, Andres CR, Guérif F. Is NMR metabolic profiling of spent embryo culture media useful to assist in vitro human embryo selection? MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2012; 26:193-202. [DOI: 10.1007/s10334-012-0331-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 06/11/2012] [Accepted: 07/12/2012] [Indexed: 01/12/2023]
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Capitani D, Di Tullio V, Proietti N. Nuclear magnetic resonance to characterize and monitor Cultural Heritage. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2012; 64:29-69. [PMID: 22578316 DOI: 10.1016/j.pnmrs.2011.11.001] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Accepted: 11/01/2011] [Indexed: 05/31/2023]
Affiliation(s)
- Donatella Capitani
- Magnetic Resonance Laboratory Annalaura Segre, Institute of Chemical Methodologies, CNR Research Area of Rome, Via Salaria km. 29.300, 00015 Monterotondo, Rome, Italy.
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Mazumder A, Kumar A, Purohit AK, Dubey DK. A high-resolution phosphorus-31 nuclear magnetic resonance (NMR) spectroscopic method for the non-phosphorus markers of chemical warfare agents. Anal Bioanal Chem 2011; 402:1643-52. [DOI: 10.1007/s00216-011-5561-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 11/02/2011] [Accepted: 11/03/2011] [Indexed: 10/14/2022]
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Mühlebach A, Adam J, Schön U. Streamlined approach to high-quality purification and identification of compound series using high-resolution MS and NMR. J Sep Sci 2011; 34:2983-8. [PMID: 21998008 DOI: 10.1002/jssc.201100382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 08/08/2011] [Accepted: 08/08/2011] [Indexed: 11/12/2022]
Abstract
Automated medicinal chemistry (parallel chemistry) has become an integral part of the drug-discovery process in almost every large pharmaceutical company. Parallel array synthesis of individual organic compounds has been used extensively to generate diverse structural libraries to support different phases of the drug-discovery process, such as hit-to-lead, lead finding, or lead optimization. In order to guarantee effective project support, efficiency in the production of compound libraries has been maximized. As a consequence, also throughput in chromatographic purification and analysis has been adapted. As a recent trend, more laboratories are preparing smaller, yet more focused libraries with even increasing demands towards quality, i.e. optimal purity and unambiguous confirmation of identity. This paper presents an automated approach how to combine effective purification and structural conformation of a lead optimization library created by microwave-assisted organic synthesis. The results of complementary analytical techniques such as UHPLC-HRMS and NMR are not only regarded but even merged for fast and easy decision making, providing optimal quality of compound stock. In comparison with the previous procedures, throughput times are at least four times faster, while compound consumption could be decreased more than threefold.
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Affiliation(s)
- Anneke Mühlebach
- Abbott Products GmbH, Unit Chemical Design and Synthesis, Hannover, Germany.
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Botana A, Howe PWA, Caër V, Morris GA, Nilsson M. High resolution 13C DOSY: the DEPTSE experiment. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 211:25-29. [PMID: 21507692 DOI: 10.1016/j.jmr.2011.03.016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 03/11/2011] [Accepted: 03/18/2011] [Indexed: 05/30/2023]
Abstract
High Resolution Diffusion-ordered Spectroscopy (HR-DOSY) is a valuable tool for mixture analysis by NMR. It separates the signals from different components according to their diffusion behavior, and can provide exquisite diffusion resolution when there is no signal overlap. In HR-DOSY experiments on (1)H (by far the most common nucleus used for DOSY) there is frequent signal overlap that confuses interpretation. In contrast, a (13)C spectrum usually has little overlap, and is in this respect a much better option for a DOSY experiment. The low signal-to-noise ratio is a critical limiting factor, but with recent technical advances such as cryogenic probes this problem is now less acute. The most widely-used pulse sequences for (13)C DOSY perform diffusion encoding with (1)H, using a stimulated echo in which half of the signal is lost. This signal loss can be avoided by encoding diffusion with (13)C in a spin echo experiment such as the DEPTSE pulse sequence described here.
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Affiliation(s)
- Adolfo Botana
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK
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20
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NMR techniques in biomedical and pharmaceutical analysis. J Pharm Biomed Anal 2011; 55:1-15. [DOI: 10.1016/j.jpba.2010.12.023] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Revised: 12/12/2010] [Accepted: 12/15/2010] [Indexed: 01/04/2023]
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Nanogram-scale preparation and NMR analysis for mass-limited small volatile compounds. PLoS One 2011; 6:e18178. [PMID: 21464906 PMCID: PMC3065492 DOI: 10.1371/journal.pone.0018178] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2010] [Accepted: 02/22/2011] [Indexed: 11/19/2022] Open
Abstract
Semiochemicals are often produced in infinitesimally small quantities, so their isolation requires large amounts of starting material, not only requiring significant effort in sample preparation, but also resulting in a complex mixture of compounds from which the bioactive compound needs to be purified and identified. Often, compounds cannot be unambiguously identified by their mass spectra alone, and NMR analysis is required for absolute chemical identification, further exacerbating the situation because NMR is relatively insensitive and requires large amounts of pure analyte, generally more than several micrograms. We developed an integrated approach for purification and NMR analysis of <1 µg of material. Collections from high performance preparative gas-chromatography are directly eluted with minimal NMR solvent into capillary NMR tubes. With this technique, 1H-NMR spectra were obtained on 50 ng of geranyl acetate, which served as a model compound, and reasonable H-H COSY NMR spectra were obtained from 250 ng of geranyl acetate. This simple off-line integration of preparative GC and NMR will facilitate the purification and chemical identification of novel volatile compounds, such as insect pheromones and other semiochemicals, which occur in minute (sub-nanogram), and often limited, quantities.
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NMR spectroscopy as a tool to close the gap on metabolite characterization under MIST. Bioanalysis 2011; 2:1263-76. [PMID: 21083239 DOI: 10.4155/bio.10.77] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Withdrawals from the market due to unforeseen adverse events have triggered changes in the way therapeutics are discovered and developed. This has resulted in an emphasis on truly understanding the efficacy and toxicity profile of new chemical entities (NCE) and the contributions of their metabolites to on-target pharmacology and off-target receptor-mediated toxicology. Members of the pharmaceutical industry, scientific community and regulatory agencies have held dialogues with respect to metabolites in safety testing (MIST); and both the US FDA and International Conference on Harmonisation have issued guidances with respect to when and how to characterize metabolites for human safety testing. This review provides a brief overview of NMR spectroscopy as applied to the structure elucidation and quantification of drug metabolites within the drug discovery and development process. It covers advances in this technique, including cryogenic cooling of detection circuitry for enhanced sensitivity, hyphenated LC-NMR techniques, improved dynamic range through new solvent-suppression pulse sequences and quantitation. These applications add to the already diverse NMR toolkit and further anchor NMR as a technique that is directly applicable to meeting the requirements of MIST guidelines.
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Fratila RM, Velders AH. Small-volume nuclear magnetic resonance spectroscopy. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2011; 4:227-249. [PMID: 21391818 DOI: 10.1146/annurev-anchem-061010-114024] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Nuclear magnetic resonance (NMR) spectroscopy is one of the most information-rich analytical techniques available. However, it is also inherently insensitive, and this drawback precludes the application of NMR spectroscopy to mass- and volume-limited samples. We review a particular approach to increase the sensitivity of NMR experiments, namely the use of miniaturized coils. When the size of the coil is reduced, the sample volume can be brought down to the nanoliter range. We compare the main coil geometries (solenoidal, planar, and microslot/stripline) and discuss their applications to the analysis of mass-limited samples. We also provide an overview of the hyphenation of microcoil NMR spectroscopy to separation techniques and of the integration with lab-on-a-chip devices and microreactors.
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Affiliation(s)
- Raluca M Fratila
- MIRA Institute for Biomedical Engineering and Technical Medicine, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands.
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Bourry D, Sinnaeve D, Gheysen K, Fritzinger B, Vandenborre G, Van Damme EJM, Wieruszeski JM, Lippens G, Ampe C, Martins JC. Intermolecular interaction studies using small volumes. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2011; 49:9-15. [PMID: 21162136 DOI: 10.1002/mrc.2699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2010] [Revised: 09/15/2010] [Accepted: 10/13/2010] [Indexed: 05/30/2023]
Abstract
We present the use of 1-mm room-temperature probe technology to perform intermolecular interaction studies using chemical shift perturbation methods and saturation transfer difference (STD) spectroscopy using small sample volumes. The use of a small sample volume (5-10 µl) allows for an alternative titration protocol where individual samples are prepared for each titration point, rather than the usual protocol used for a 5-mm probe setup where the ligand is added consecutively to the solution containing the protein or host of interest. This allows for considerable economy in the consumption and cost of the protein and ligand amounts required for interaction studies. For titration experiments, the use of the 1-mm setup consumes less than 10% of the ligand amount required using a 5-mm setup. This is especially significant when complex ligands that are only available in limited quantities, typically because they are obtained from natural sources or through elaborate synthesis efforts, need to be investigated. While the use of smaller volumes does increase the measuring time, we demonstrate that the use of commercial small volume probes allows the study of interactions that would otherwise be impossible to address by NMR.
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Affiliation(s)
- David Bourry
- Department of Chemistry, Ghent University, Ghent, Belgium
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Dunn WB, Broadhurst DI, Atherton HJ, Goodacre R, Griffin JL. Systems level studies of mammalian metabolomes: the roles of mass spectrometry and nuclear magnetic resonance spectroscopy. Chem Soc Rev 2010; 40:387-426. [PMID: 20717559 DOI: 10.1039/b906712b] [Citation(s) in RCA: 557] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The study of biological systems in a holistic manner (systems biology) is increasingly being viewed as a necessity to provide qualitative and quantitative descriptions of the emergent properties of the complete system. Systems biology performs studies focussed on the complex interactions of system components; emphasising the whole system rather than the individual parts. Many perturbations to mammalian systems (diet, disease, drugs) are multi-factorial and the study of small parts of the system is insufficient to understand the complete phenotypic changes induced. Metabolomics is one functional level tool being employed to investigate the complex interactions of metabolites with other metabolites (metabolism) but also the regulatory role metabolites provide through interaction with genes, transcripts and proteins (e.g. allosteric regulation). Technological developments are the driving force behind advances in scientific knowledge. Recent advances in the two analytical platforms of mass spectrometry (MS) and nuclear magnetic resonance (NMR) spectroscopy have driven forward the discipline of metabolomics. In this critical review, an introduction to metabolites, metabolomes, metabolomics and the role of MS and NMR spectroscopy will be provided. The applications of metabolomics in mammalian systems biology for the study of the health-disease continuum, drug efficacy and toxicity and dietary effects on mammalian health will be reviewed. The current limitations and future goals of metabolomics in systems biology will also be discussed (374 references).
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Affiliation(s)
- Warwick B Dunn
- Manchester Centre for Integrative Systems Biology, University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK.
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Coen M, Wevers RA, Lindon JC, Blom HJ. High-resolution 1H NMR spectroscopic investigation of a chick embryo model of neural tube development. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2009; 47 Suppl 1:S62-S67. [PMID: 19862797 DOI: 10.1002/mrc.2534] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
High-field (1)H nuclear magnetic resonance (NMR) spectroscopy together with cryogenic probe capabilities have been applied to obtain metabolic profiles of chick embryos and to determine the suitability of the platform for profiling such mass-limited samples. Metabolic profiles were generated for both pooled and single embryo samples at early stages of neural development, using both 600 and 800 MHz (1)H NMR spectrometer platforms. High-resolution metabolic profiles, representing metabolites from many chemical classes, including triglycerides, organic acids, carbohydrates, amino acids and nucleosides, were rapidly acquired. Neural tube defects (NTDs) are severe congenital malformations, and evidence exists for prevention of NTDs by periconceptional supplementation of the diet with folate. The molecular basis for the protective ability of folate in prevention of NTDs is not clear, although the involvement of methylation has been postulated. Thus, the metabolic profiles of chick embryos following inhibition of enzymes of the methylation cycle and the effect of their action on neural tube closure were investigated. The embryos were profiled at early stages of development, and closure of the neural tube was followed via digital imaging. Metabolic profiles of embryo samples representing both neural tube closure and the neural tube remaining open were discriminated; glucose levels were found to be significantly higher in methylation-inhibited samples. The application of a non-targeted metabolic profiling approach for the study of a chick embryo model of NTDs is novel and presents the exciting potential to provide metabolic insight necessary to elucidate the complex interplay of one-carbon moiety metabolism and NTDs.
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Affiliation(s)
- Muireann Coen
- Biomolecular Medicine, Department of Surgery and Cancer, Faculty of Medicine, Imperial College London, Sir Alexander Fleming Building, South Kensington, London, SW7 2AZ, UK.
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28
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Rapid etiological classification of meningitis by NMR spectroscopy based on metabolite profiles and host response. PLoS One 2009; 4:e5328. [PMID: 19390697 PMCID: PMC2669500 DOI: 10.1371/journal.pone.0005328] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2008] [Accepted: 03/18/2009] [Indexed: 11/25/2022] Open
Abstract
Bacterial meningitis is an acute disease with high mortality that is reduced by early treatment. Identification of the causative microorganism by culture is sensitive but slow. Large volumes of cerebrospinal fluid (CSF) are required to maximise sensitivity and establish a provisional diagnosis. We have utilised nuclear magnetic resonance (NMR) spectroscopy to rapidly characterise the biochemical profile of CSF from normal rats and animals with pneumococcal or cryptococcal meningitis. Use of a miniaturised capillary NMR system overcame limitations caused by small CSF volumes and low metabolite concentrations. The analysis of the complex NMR spectroscopic data by a supervised statistical classification strategy included major, minor and unidentified metabolites. Reproducible spectral profiles were generated within less than three minutes, and revealed differences in the relative amounts of glucose, lactate, citrate, amino acid residues, acetate and polyols in the three groups. Contributions from microbial metabolism and inflammatory cells were evident. The computerised statistical classification strategy is based on both major metabolites and minor, partially unidentified metabolites. This data analysis proved highly specific for diagnosis (100% specificity in the final validation set), provided those with visible blood contamination were excluded from analysis; 6–8% of samples were classified as indeterminate. This proof of principle study suggests that a rapid etiologic diagnosis of meningitis is possible without prior culture. The method can be fully automated and avoids delays due to processing and selective identification of specific pathogens that are inherent in DNA-based techniques.
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Dalisay DS, Molinski TF. NMR quantitation of natural products at the nanomole scale. JOURNAL OF NATURAL PRODUCTS 2009; 72:739-44. [PMID: 19399996 PMCID: PMC2753506 DOI: 10.1021/np900009b] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We describe a simple and accurate method for quantitation by solvent 13C-satellites (QSCS) of very small amounts of natural products using microprobe NMR spectroscopy. The method takes advantage of integration of 13C satellite peaks of deuterated solvents, in particular CDCl3, that have favorable intensities for measurements of samples in NMR microcoils and microprobe tubes in the 1-200 nanomole range.
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Affiliation(s)
- Doralyn S. Dalisay
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
| | - Tadeusz F. Molinski
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358
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Koskela H, Ervasti M, Björk H, Vanninen P. On-Flow Pulsed Field Gradient Heteronuclear Correlation Spectrometry in Off-Line LC−SPE−NMR Analysis of Chemicals Related to the Chemical Weapons Convention. Anal Chem 2009; 81:1262-9. [DOI: 10.1021/ac802407t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Harri Koskela
- VERIFIN, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Technology and Transport, Helsinki Metropolia University of Applied Sciences, P.O. Box 4000, FIN-00079 Helsinki, Finland
| | - Mia Ervasti
- VERIFIN, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Technology and Transport, Helsinki Metropolia University of Applied Sciences, P.O. Box 4000, FIN-00079 Helsinki, Finland
| | - Heikki Björk
- VERIFIN, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Technology and Transport, Helsinki Metropolia University of Applied Sciences, P.O. Box 4000, FIN-00079 Helsinki, Finland
| | - Paula Vanninen
- VERIFIN, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Technology and Transport, Helsinki Metropolia University of Applied Sciences, P.O. Box 4000, FIN-00079 Helsinki, Finland
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Application of microscale-preparative multidimensional gas chromatography with nuclear magnetic resonance spectroscopy for identification of pure methylnaphthalenes from crude oils. J Chromatogr A 2008; 1215:168-76. [DOI: 10.1016/j.chroma.2008.10.102] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Revised: 10/30/2008] [Accepted: 10/30/2008] [Indexed: 11/30/2022]
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32
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Walker GS, O'Connell TN. Comparison of LC-NMR and conventional NMR for structure elucidation in drug metabolism studies. Expert Opin Drug Metab Toxicol 2008; 4:1295-305. [PMID: 18798699 DOI: 10.1517/17425255.4.10.1295] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Liquid chromatography-nuclear magnetic resonance (LC-NMR) has proven to be a useful technique for the structure elucidation of novel metabolites from pharmaceutical compounds. Proponents of LC-NMR tout the advantage of eliminating the step of a separate chromatographic isolation. However, the advantages of directly coupling NMR and HPLC instrumentation must be weighed against compromises in performance made to each technique to achieve a hyphenated system. While significant advances have been made in LC-NMR technology, a strong case can be made that HPLC purification of metabolites followed by conventional tube NMR is equally useful. It is relatively rare that one approach will be successful and the other not. The fundamental consideration is whether there is sufficient chromatographic expertise in the NMR laboratory to adequately design and execute appropriate experiments such that a pure chromatographic peak will be produced in the hyphenated system. Due to speed and sensitivity differences between NMR spectroscopy and mass spectrometry, liquid chromatography/mass spectrometry (LC/MS) continues to be the front-line approach for the structure elucidation of metabolites.
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Affiliation(s)
- Gregory S Walker
- Pfizer, Inc., Global Research and Development, Eastern Point Road, Groton, CT 06340, USA.
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Eyres GT, Urban S, Morrison PD, Dufour JP, Marriott PJ. Method for Small-Molecule Discovery Based on Microscale-Preparative Multidimensional Gas Chromatography Isolation with Nuclear Magnetic Resonance Spectroscopy. Anal Chem 2008; 80:6293-9. [DOI: 10.1021/ac8007847] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Graham T. Eyres
- Australian Centre for Research on Separation Science (ACROSS) and Marine And Terrestrial Natural Product (MATNAP) Research Group, School of Applied Sciences, RMIT University, G.P.O. Box 2476V, Melbourne, Victoria 3001, Australia, and Department of Food Science, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Sylvia Urban
- Australian Centre for Research on Separation Science (ACROSS) and Marine And Terrestrial Natural Product (MATNAP) Research Group, School of Applied Sciences, RMIT University, G.P.O. Box 2476V, Melbourne, Victoria 3001, Australia, and Department of Food Science, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Paul D. Morrison
- Australian Centre for Research on Separation Science (ACROSS) and Marine And Terrestrial Natural Product (MATNAP) Research Group, School of Applied Sciences, RMIT University, G.P.O. Box 2476V, Melbourne, Victoria 3001, Australia, and Department of Food Science, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Jean-Pierre Dufour
- Australian Centre for Research on Separation Science (ACROSS) and Marine And Terrestrial Natural Product (MATNAP) Research Group, School of Applied Sciences, RMIT University, G.P.O. Box 2476V, Melbourne, Victoria 3001, Australia, and Department of Food Science, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
| | - Philip J. Marriott
- Australian Centre for Research on Separation Science (ACROSS) and Marine And Terrestrial Natural Product (MATNAP) Research Group, School of Applied Sciences, RMIT University, G.P.O. Box 2476V, Melbourne, Victoria 3001, Australia, and Department of Food Science, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand
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Koskela H, Vanninen P. Application of a Microcoil Probe Head in NMR Analysis of Chemicals Related to the Chemical Weapons Convention. Anal Chem 2008; 80:5556-64. [DOI: 10.1021/ac800623p] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Harri Koskela
- VERIFIN, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
| | - Paula Vanninen
- VERIFIN, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland
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Bjarnholt N, Rook F, Motawia MS, Cornett C, Jørgensen C, Olsen CE, Jaroszewski JW, Bak S, Møller BL. Diversification of an ancient theme: hydroxynitrile glucosides. PHYTOCHEMISTRY 2008; 69:1507-16. [PMID: 18342345 DOI: 10.1016/j.phytochem.2008.01.022] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2007] [Revised: 01/27/2008] [Accepted: 01/29/2008] [Indexed: 05/08/2023]
Abstract
Many plants produce cyanogenic glucosides as part of their chemical defense. They are alpha-hydroxynitrile glucosides, which release toxic hydrogen cyanide (HCN) upon cleavage by endogenous plant beta-glucosidases. In addition to cyanogenic glucosides, several plant species produce beta- and gamma-hydroxynitrile glucosides. These do not release HCN upon hydrolysis by beta-glucosidases and little is known about their biosynthesis and biological significance. We have isolated three beta-hydroxynitrile glucosides, namely (2Z)-2-(beta-D-glucopyranosyloxy)but-2-enenitrile and (2R,3R)- and (2R,3S)-2-methyl-3-(beta-D-glucopyranosyloxy)butanenitrile, from leaves of Ribesuva-crispa. These compounds have not been identified previously. We show that in several species of the genera Ribes, Rhodiola and Lotus, these beta-hydroxynitrile glucosides co-occur with the L-isoleucine-derived hydroxynitrile glucosides, lotaustralin (alpha-hydroxynitrile glucoside), rhodiocyanosides A (gamma-hydroxynitrile glucoside) and D (beta-hydroxynitrile glucoside) and in some cases with sarmentosin (a hydroxylated rhodiocyanoside A). Radiolabelling experiments demonstrated that the hydroxynitrile glucosides in R. uva-crispa and Hordeum vulgare are derived from L-isoleucine and L-leucine, respectively. Metabolite profiling of the natural variation in the content of cyanogenic glucosides and beta- and gamma-hydroxynitrile glucosides in wild accessions of Lotus japonicus in combination with genetic crosses and analyses of the metabolite profile of the F2 population provided evidence that a single recessive genetic trait is most likely responsible for the presence or absence of beta- and gamma-hydroxynitrile glucosides in L. japonicus. Our findings strongly support the notion that the beta- and gamma-hydroxynitrile glucosides are produced by diversification of the cyanogenic glucoside biosynthetic pathway at the level of the nitrile intermediate.
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Affiliation(s)
- Nanna Bjarnholt
- Plant Biochemistry Laboratory and Center for Molecular Plant Physiology (PlaCe), Department of Plant Biology, Faculty of Life Sciences, University of Copenhagen, Frederiksberg C, Copenhagen, Denmark
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Koehn FE. High impact technologies for natural products screening. PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 2007; 65:175, 177-210. [PMID: 18084916 DOI: 10.1007/978-3-7643-8117-2_5] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Natural products have historically been a rich source of lead molecules in drug discovery. However, natural products have been de-emphasized as high throughput screening resources in the recent past, in part because of difficulties in obtaining high quality natural products screening libraries, or in applying modern screening assays to these libraries. In addition, natural products programs based on screening of extract libraries, bioassay-guided isolation, structure elucidation and subsequent production scale-up are challenged to meet the rapid cycle times that are characteristic of the modern HTS approach. Fortunately, new technologies in mass spectrometry, NMR and other spectroscopic techniques can greatly facilitate the first components of the process - namely the efficient creation of high-quality natural products libraries, bimolecular target or cell-based screening, and early hit characterization. The success of any high throughput screening campaign is dependent on the quality of the chemical library. The construction and maintenance of a high quality natural products library, whether based on microbial, plant, marine or other sources is a costly endeavor. The library itself may be composed of samples that are themselves mixtures - such as crude extracts, semi-pure mixtures or single purified natural products. Each of these library designs carries with it distinctive advantages and disadvantages. Crude extract libraries have lower resource requirements for sample preparation, but high requirements for identification of the bioactive constituents. Pre-fractionated libraries can be an effective strategy to alleviate interferences encountered with crude libraries, and may shorten the time needed to identify the active principle. Purified natural product libraries require substantial resources for preparation, but offer the advantage that the hit detection process is reduced to that of synthetic single component libraries. Whether the natural products library consists of crude or partially fractionated mixtures, the library contents should be profiled to identify the known components present - a process known as dereplication. The use of mass spectrometry and HPLC-mass spectrometry together with spectral databases is a powerful tool in the chemometric profiling of bio-sources for natural product production. High throughput, high sensitivity flow NMR is an emerging tool in this area as well. Whether by cell based or biomolecular target based assays, screening of natural product extract libraries continues to furnish novel lead molecules for further drug development, despite challenges in the analysis and prioritization of natural products hits. Spectroscopic techniques are now being used to directly screen natural product and synthetic libraries. Mass spectrometry in the form of methods such as ESI-ICRFTMS, and FACS-MS as well as NMR methods such as SAR by NMR and STD-NMR have been utilized to effectively screen molecular libraries. Overall, emerging advances in mass spectrometry, NMR and other technologies are making it possible to overcome the challenges encountered in screening natural products libraries in today's drug discovery environment. As we apply these technologies and develop them even further, we can look forward to increased impact of natural products in the HTS based drug discovery.
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Affiliation(s)
- Frank E Koehn
- Natural Products Discovery Research - Chemical and Screening Sciences, Wyeth Research, Pearl River, NY 10965, USA.
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Hertkorn N, Ruecker C, Meringer M, Gugisch R, Frommberger M, Perdue EM, Witt M, Schmitt-Kopplin P. High-precision frequency measurements: indispensable tools at the core of the molecular-level analysis of complex systems. Anal Bioanal Chem 2007; 389:1311-27. [PMID: 17924102 PMCID: PMC2259236 DOI: 10.1007/s00216-007-1577-4] [Citation(s) in RCA: 225] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2007] [Accepted: 08/20/2007] [Indexed: 11/30/2022]
Abstract
This perspective article provides an assessment of the state-of-the-art in the molecular-resolution analysis of complex organic materials. These materials can be divided into biomolecules in complex mixtures (which are amenable to successful separation into unambiguously defined molecular fractions) and complex nonrepetitive materials (which cannot be purified in the conventional sense because they are even more intricate). Molecular-level analyses of these complex systems critically depend on the integrated use of high-performance separation, high-resolution organic structural spectroscopy and mathematical data treatment. At present, only high-precision frequency-derived data exhibit sufficient resolution to overcome the otherwise common and detrimental effects of intrinsic averaging, which deteriorate spectral resolution to the degree of bulk-level rather than molecular-resolution analysis. High-precision frequency measurements are integral to the two most influential organic structural spectroscopic methods for the investigation of complex materials-NMR spectroscopy (which provides unsurpassed detail on close-range molecular order) and FTICR mass spectrometry (which provides unrivalled resolution)-and they can be translated into isotope-specific molecular-resolution data of unprecedented significance and richness. The quality of this standalone de novo molecular-level resolution data is of unparalleled mechanistic relevance and is sufficient to fundamentally advance our understanding of the structures and functions of complex biomolecular mixtures and nonrepetitive complex materials, such as natural organic matter (NOM), aerosols, and soil, plant and microbial extracts, all of which are currently poorly amenable to meaningful target analysis. The discrete analytical volumetric pixel space that is presently available to describe complex systems (defined by NMR, FT mass spectrometry and separation technologies) is in the range of 10(8-14) voxels, and is therefore capable of providing the necessary detail for a meaningful molecular-level analysis of very complex mixtures. Nonrepetitive complex materials exhibit mass spectral signatures in which the signal intensity often follows the number of chemically feasible isomers. This suggests that even the most strongly resolved FTICR mass spectra of complex materials represent simplified (e.g. isomer-filtered) projections of structural space.
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Affiliation(s)
- N Hertkorn
- GSF Research Center for Environment and Health, Institute of Ecological Chemistry, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany.
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Clarkson C, Sibum M, Mensen R, Jaroszewski JW. Evaluation of on-line solid-phase extraction parameters for hyphenated, high-performance liquid chromatography–solid-phase extraction–nuclear magnetic resonance applications. J Chromatogr A 2007; 1165:1-9. [PMID: 17709113 DOI: 10.1016/j.chroma.2007.07.016] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2007] [Revised: 06/20/2007] [Accepted: 07/02/2007] [Indexed: 10/23/2022]
Abstract
The hyphenated technique HPLC-SPE-NMR is proving to be a useful analytical tool for structure elucidation of mixture components, particularly for mass-limited samples where traditional isolation procedures are either time consuming or challenging. In this work, we investigated SPE trapping performance of 25 model natural products within a format corresponding to that of HPLC-SPE-NMR hyphenation. Six different silica-based bonded phases and two polymeric phases were evaluated. The trapping efficiency of polystyrene/divinylbenzene polymers was generally superior compared to silica bonded phases, which showed variable results and performed well only with hydrophobic analytes. Acetonitrile concentration in the loading solvent was critical for trapping on polymeric phase (Resin GP), as small changes of the organic solvent concentration (+/-3%) could alter the trapping efficiency significantly. Flow rate changes of the loading solvent within 0.8-5.0 mL/min did not affect trapping kinetics. Simulation of multiple trapping showed excellent performance of this approach for hydrophobic analytes, and moderate gain for more polar analytes that do not trap quantitatively in a single trapping step. Determination of 50% breakthrough levels by frontal chromatography analysis showed feasibility of accumulation of analyte amounts corresponding to about 0.5 micromol (10 mm x 2 mm i.d. Resin GP cartridge).
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Affiliation(s)
- Cailean Clarkson
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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Aramini JM, Rossi P, Anklin C, Xiao R, Montelione GT. Microgram-scale protein structure determination by NMR. Nat Methods 2007; 4:491-3. [PMID: 17496898 DOI: 10.1038/nmeth1051] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2006] [Accepted: 04/06/2007] [Indexed: 11/09/2022]
Abstract
Using conventional triple-resonance nuclear magnetic resonance (NMR) experiments with a 1 mm triple-resonance microcoil NMR probe, we determined near complete resonance assignments and three-dimensional (3D) structure of the 68-residue Methanosarcina mazei TRAM protein using only 72 mug (6 microl, 1.4 mM) of protein. This first example of a complete solution NMR structure determined using microgram quantities of protein demonstrates the utility of microcoil-probe NMR technologies for protein samples that can be produced in only limited quantities.
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Affiliation(s)
- James M Aramini
- Center for Advanced Biotechnology and Medicine, Department of Molecular Biology and Biochemistry, and Northeast Structural Genomics Consortium (NESG), Rutgers University, Piscataway, New Jersey 08854, USA
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40
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Want EJ, Nordström A, Morita H, Siuzdak G. From exogenous to endogenous: the inevitable imprint of mass spectrometry in metabolomics. J Proteome Res 2007; 6:459-68. [PMID: 17269703 DOI: 10.1021/pr060505+] [Citation(s) in RCA: 197] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mass spectrometry (MS) is an established technology in drug metabolite analysis and is now expanding into endogenous metabolite research. Its utility derives from its wide dynamic range, reproducible quantitative analysis, and the ability to analyze biofluids with extreme molecular complexity. The aims of developing mass spectrometry for metabolomics range from understanding basic biochemistry to biomarker discovery and the structural characterization of physiologically important metabolites. In this review, we will discuss the techniques involved in this exciting area and the current and future applications of this field.
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Affiliation(s)
- Elizabeth J Want
- Department of Molecular Biology, The Scripps Center for Mass Spectrometry, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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41
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Want EJ, Cravatt BF, Siuzdak G. The expanding role of mass spectrometry in metabolite profiling and characterization. Chembiochem 2006; 6:1941-51. [PMID: 16206229 DOI: 10.1002/cbic.200500151] [Citation(s) in RCA: 175] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Mass spectrometry has a strong history in drug-metabolite analysis and has recently emerged as the foremost technology in endogenous metabolite research. The advantages of mass spectrometry include a wide dynamic range, the ability to observe a diverse number of molecular species, and reproducible quantitative analysis. These attributes are important in addressing the issue of metabolite profiling, as the dynamic range easily exceeds nine orders of magnitude in biofluids, and the diversity of species ranges from simple amino acids to lipids to complex carbohydrates. The goals of the application of mass spectrometry range from basic biochemistry to clinical biomarker discovery with challenges in generating a comprehensive profile, data analysis, and structurally characterizing physiologically important metabolites. The precedent for this work has already been set in neonatal screening, as blood samples from millions of neonates are tested routinely by mass spectrometry as a diagnostic tool for inborn errors of metabolism. In this review, we will discuss the background from which contemporary metabolite research emerged, the techniques involved in this exciting area, and the current and future applications of this field.
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Affiliation(s)
- Elizabeth J Want
- Department of Molecular Biology and The Center for Mass Spectrometry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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Jansma A, Chuan T, Albrecht RW, Olson DL, Peck TL, Geierstanger BH. Automated microflow NMR: routine analysis of five-microliter samples. Anal Chem 2005; 77:6509-15. [PMID: 16194121 PMCID: PMC1395504 DOI: 10.1021/ac050936w] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A microflow CapNMR probe double-tuned for 1H and 13C was installed on a 400-MHz NMR spectrometer and interfaced to an automated liquid handler. Individual samples dissolved in DMSO-d6 are submitted for NMR analysis in vials containing as little as 10 microL of sample. Sets of samples are submitted in a low-volume 384-well plate. Of the 10 microL of sample per well, as with vials, 5 microL is injected into the microflow NMR probe for analysis. For quality control of chemical libraries, 1D NMR spectra are acquired under full automation from 384-well plates on as many as 130 compounds within 24 h using 128 scans per spectrum and a sample-to-sample cycle time of approximately 11 min. Because of the low volume requirements and high mass sensitivity of the microflow NMR system, 30 nmol of a typical small molecule is sufficient to obtain high-quality, well-resolved, 1D proton or 2D COSY NMR spectra in approximately 6 or 20 min of data acquisition time per experiment, respectively. Implementation of pulse programs with automated solvent peak identification and suppression allow for reliable data collection, even for samples submitted in fully protonated DMSO. The automated microflow NMR system is controlled and monitored using web-based software.
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Affiliation(s)
- Ariane Jansma
- Protein Sciences Department, Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, California 92121-1125, USA
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Webb AG. Nuclear magnetic resonance coupled microseparations. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:688-96. [PMID: 16049953 DOI: 10.1002/mrc.1616] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The increased separation efficiency afforded by reducing the size of the separation column has resulted in 'microseparations' becoming an important component in many chemical and biochemical applications. The coupling of microseparations with NMR detection is an area of increasing interest owing to the high structural information of NMR. In order to couple efficiently with the separation, the NMR detector must be reduced in size to correspond to that of the separation peak. This paper summarizes some of the approaches used in coupling NMR detection with pressure-driven and electrophoretic microseparations, the design of small NMR detectors and applications of this technology.
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Affiliation(s)
- A G Webb
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, 61801, USA.
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Lewis RJ, Bernstein MA, Duncan SJ, Sleigh CJ. A comparison of capillary-scale LC-NMR with alternative techniques: spectroscopic and practical considerations. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:783-9. [PMID: 16049949 DOI: 10.1002/mrc.1614] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Experimental and practical details for the use of capillary LC (CapLC)-NMR are reported. The capillary NMR probe has high sensitivity and excellent flow characteristics and we found CapLC-NMR to be best suited to samples that are truly mass limited. CapLC-NMR relies on good capillary-scale chromatography where highly concentrated peaks with a volume closely matched to the NMR flow cell are achievable. Provided that the loading capacity of the capillary column is not limiting, the combination of high sensitivity and high solvent suppression quality makes CapLC-NMR an excellent choice. For many real samples, however, the loading is limiting and we found the combination of LC-SPE-MS-NMR with a cryoprobe enables more material to be purified for NMR analysis, while retaining sensitivity.
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Affiliation(s)
- Richard J Lewis
- Department of Physical and Metabolic Science, AstraZeneca R & D Charnwood, Loughborough, UK
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45
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Webb AG. Microcoil nuclear magnetic resonance spectroscopy. J Pharm Biomed Anal 2005; 38:892-903. [PMID: 16087050 DOI: 10.1016/j.jpba.2005.01.048] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2004] [Revised: 01/15/2005] [Accepted: 01/22/2005] [Indexed: 11/16/2022]
Abstract
In comparison with most analytical chemistry techniques, nuclear magnetic resonance has an intrinsically low sensitivity, and many potential applications are therefore precluded by the limited available quantity of certain types of sample. In recent years, there has been a trend, both commercial and academic, towards miniaturization of the receiver coil in order to increase the mass sensitivity of NMR measurements. These small coils have also proved very useful in coupling NMR detection with commonly used microseparation techniques. A further development enabled by small detectors is parallel data acquisition from many samples simultaneously, made possible by incorporating multiple receiver coils into a single NMR probehead. This review article summarizes recent developments and applications of "microcoil" NMR spectroscopy.
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Affiliation(s)
- A G Webb
- Department of Electrical and Computer Engineering, and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 4221 Beckman Institute, 405 N. Mathews, Urbana, IL 61801, USA.
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Kenseth JR, Coldiron SJ. High-throughput characterization and quality control of small-molecule combinatorial libraries. Curr Opin Chem Biol 2005; 8:418-23. [PMID: 15288253 DOI: 10.1016/j.cbpa.2004.06.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
To fully realize the potential of combinatorial synthesis and high-throughput screening for increasing the efficiency of the drug discovery and development process, issues related to compound purity must be addressed. Impurities, often present after synthesis, can lead to ambiguous screening results and inhibit the development of quality structure-activity relationships. The demand for high-throughput analytical characterization of combinatorial libraries has prompted the development of more rapid methods to keep pace with compound production. Recent progress has focused upon the development of parallel separation methods, multiplexed detector interfaces, and synergistic combinations of different detectors possessing complementary selectivities.
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Dunn AJ, Sidebottom PJ. Fast 1H-13C correlation data for use in automatic structure confirmation of small organic compounds. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43:124-131. [PMID: 15593356 DOI: 10.1002/mrc.1517] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A method of speeding up the acquisition of 1H-13C correlation data has been developed. It is applicable in situations where the experiment time is determined by the need to sample the second dimension adequately rather than by signal-to-noise ratio requirements. Two spectra with different, reduced, 13C sweep widths are measured, time being saved by reducing the number of increments in line with the reduction in the sweep width. Rules are presented for the selection of the two reduced sweep widths so that the correct 13C chemical shifts can be easily and unambiguously calculated. The benefits and limitations of this approach, in the context of the structure confirmation of small (MW < or = 450) organic compounds, is discussed. The use of a third spectrum to resolve problems that may be encountered when proton signals overlap is demonstrated.
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Affiliation(s)
- Adrian J Dunn
- GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
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48
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Spyros A, Anglos D. Study of Aging in Oil Paintings by 1D and 2D NMR Spectroscopy. Anal Chem 2004; 76:4929-36. [PMID: 15373425 DOI: 10.1021/ac049350k] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nuclear magnetic resonance spectroscopy is proposed as an efficient analytical tool in the study of painted artworks. The binding medium from two original oil paintings, dated from the early 20th and the late 17th century, was studied via high-resolution 1D and 2D NMR, establishing the advanced state of hydrolysis and oxidation of the oil paint. Studies of the solvent-extractable component from model samples of various drying oils, raw oil paints, and aged oil paints allowed the definition of several markers based on the integral ratios of various chemical species present in the 1H and 13C NMR spectra. These markers are sensitive to hydrolytic and oxidative processes that reflect the extent of aging in oil paintings. The rapidity, simplicity, and nondestructive nature of the proposed analytical NMR methodology represents a great advantage, since the usually minute sample quantities available from original artwork can be subsequently analyzed further by other analytical techniques, if necessary.
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Affiliation(s)
- Apostolos Spyros
- NMR Laboratory, Department of Chemistry, University of Crete, Knossos Avenue, 71409 Heraklion, Crete, Greece.
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Fura A, Shu YZ, Zhu M, Hanson RL, Roongta V, Humphreys WG. Discovering Drugs through Biological Transformation: Role of Pharmacologically Active Metabolites in Drug Discovery. J Med Chem 2004; 47:4339-51. [PMID: 15317447 DOI: 10.1021/jm040066v] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aberra Fura
- Bristol Myers Squibb, Pharmaceutical Research Institute, P.O. Box 5400, Princeton, New Jersey 08534, USA.
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50
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Li Y, Logan TM, Edison AS, Webb A. Design of small volume HX and triple-resonance probes for improved limits of detection in protein NMR experiments. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2003; 164:128-135. [PMID: 12932464 DOI: 10.1016/s1090-7807(03)00184-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Three- and four-frequency nuclear magnetic-resonance probes have been designed for the study of small amounts of protein. Both "HX" (1H, X, and 2H channels) and "triple-resonance" (1H, 15N, 13C, and 2H) probes were implemented using a single transmit/receive coil and multiple-frequency impedance matching circuits. The coil used was a six-turn solenoid with an observe volume of 15 microl. A variable pitch design was used to improve the B1 homogeneity of the coil. Two-dimensional HSQC spectra of approximately 1mM single labeled 15N- and double labeled 15N/13C-proteins were acquired in experimental times of approximately 2h. Triple-resonance capability of the small-volume triple-resonance probe was demonstrated by acquiring three-dimensional HNCO spectra from the same protein samples. In addition to enabling very small quantities of protein to be used, the extremely short pulse widths (1H = 4, 15N = 4, and 13C = 2 micros) of this particular design result in low power decoupling and wide-bandwidth coverage, an important factor for the ever-higher operating frequencies used for protein NMR studies.
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Affiliation(s)
- Yu Li
- Department of Electrical and Computer Engineering and Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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