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LC–NMR for Natural Product Analysis: A Journey from an Academic Curiosity to a Robust Analytical Tool. SCI 2021. [DOI: 10.3390/sci3010006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Liquid chromatography (LC)–nuclear magnetic resonance (NMR) combines the advantage of the outstanding separation power of liquid chromatography (LC) and the superior structural elucidating capability of nuclear magnetic resonance (NMR). NMR has proved that it is a standout detector for LC by providing maximum structural information about plant originated extracts, particularly on the isolating ability of isomeric (same molecular formula) and/or isobaric (same molecular weight) compounds as compared to other detectors. The present review provides an overview of the developmental trends and application of LC–NMR in natural product analysis. The different LC–NMR operational modes are described, and how technical improvements assist in establishing this powerful technique as an important analytical tool in the analysis of complex plant-derived compounds is also highlighted. On-flow, stop-flow and loop-storage modes, as well as the new offline mode LC–solid phase extraction (SPE)–NMR and capillary LC (capLC)–NMR configurations which avoid the ingestion of expensive deuterated solvents throughout the experiment, are mentioned. Utilization of cryogenic probe and microprobe technologies, which are the other important promising approaches for guaranteeing sensitivity, are also described. Concluding remarks and future outlooks are also discussed.
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LC-NMR for Natural Products Analysis: A Journey from an Academic Curiosity to a Robust Analytical Tool. SCI 2019. [DOI: 10.3390/sci1010031] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
LC–NMR combines the advantage of the outstanding separation power of liquid chromatography (LC) and the superior structural elucidating capability of nuclear magnetic resonance (NMR). NMR has proved that it is a standout detector for LC by providing maximum structural information about plant originated extracts particularly in its isolating ability of isomeric (same molecular formula) and/or isobaric (same molecular weight) compounds as compared to other detectors. The present review provides an overview of the LC–NMR developmental trends and its application in natural products analysis. The different LC–NMR operational modes are described, as well as how technical improvements assist in establishing this powerful technique as an important analytical tool in the analysis of complex plant-derived compounds. On-flow, stop-flow and loop-storage modes, as well as the new offline mode LC–SPE–NMR and capLC-NMR configurations that avoid the ingestion of expensive deuterated solvents throughout the experiment are mentioned. Utilization of cryogenic probe and microprobe technologies which are the other important promising approaches for guaranteeing the sensitivity issues are also described. Concluding remarks and future outlooks are also discussed.
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Cretton S, Muñoz O, Tapia J, Marcourt L, Maes L, Christen P. Two New Hygroline and Tropane Alkaloids Isolated from Schizanthus Hookeri and S. Tricolor (Solanaceae). Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Two new hygroline and tropane alkaloids, 4-hydroxybenzenepropanoylhygroline (1) and 3α,4β-dihydroxy-6β-angeloyoxytropane (2) have been isolated from the aerial parts of Schizanthus hookeri and S. tricolor, respectively, two plants indigenous from Chile. Their structures were elucidated by spectroscopic methods and high resolution mass spectrometry. Their antiparasitic activity and cytotoxicity were measured.
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Affiliation(s)
- Sylvian Cretton
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Orlando Muñoz
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Jorge Tapia
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Laurence Marcourt
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
| | - Louis Maes
- Laboratory for Microbiology, Parasitology and Hygiene (LMPH), Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, Universiteitsplein 1, 2610 Antwerp, Belgium
| | - Philippe Christen
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Rue Michel-Servet 1, CH-1211 Geneva 4, Switzerland
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Zhu D, Miao ZY, Yang RX, Wen HM, Li W, Chen J, Kang A, Shan CX, Yu S, Hu Y. Layer-by-layer functionalized porous Zinc sulfide nanospheres-based solid-phase extraction combined with liquid chromatography time-of-flight/mass and gas chromatography-mass spectrometry for the specific enrichment and identification of alkaloids from Crinum asiaticum var. sinicum. Anal Chim Acta 2016; 932:60-8. [DOI: 10.1016/j.aca.2016.05.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 05/17/2016] [Accepted: 05/20/2016] [Indexed: 11/15/2022]
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Lam SH, Chen CK, Wang JS, Lee SS. Investigation of Flavonoid Glycosides fromNeolitsea Sericeavar.Auratavia the General Method and HPLC-SPE-NMR. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200800067] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Wolfender JL, Queiroz EF, Hostettmann K. The importance of hyphenated techniques in the discovery of new lead compounds from nature. Expert Opin Drug Discov 2013; 1:237-60. [PMID: 23495845 DOI: 10.1517/17460441.1.3.237] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Nature represents an extraordinary reservoir of novel molecules and there is currently a resurgence of interest in natural products as a possible source of new lead compounds for introduction into therapeutical screening programmes. To discover new bioactive natural products, the dereplication of crude extracts performed prior to isolation work is of crucial importance for avoiding the tedious isolation of known constituents. In this respect, chemical screening strategies based on hyphenated techniques such as liquid chromatography-ultraviolet photodiode array detection, liquid chromatography-mass spectrometry, liquid chromatography tandom mass spectrometry and liquid chromatography-nuclear magnetic resonance (LC-NMR) are more and more extensively used. In the laboratory of Hostettmann's group, these analytical methods have been fully integrated into the isolation process and are used for the chemical screening of crude plant extracts, in complement with online or at-line bioassays, for rapid localisation and identification of new bioactive compounds. In this paper, possibilities and limitations of hyphenated techniques for de novo online natural product identification are discussed. As LC-NMR is playing a key role in this respect, the main part of the paper is dedicated to this technique. In particular, various ways of integrating NMR in the dereplication process are illustrated and strategies involving either direct or indirect hyphenation are presented.
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Affiliation(s)
- Jean-Luc Wolfender
- Laboratory of Pharmacognosy and Pytochemistry, School of Pharmaceutical Sciences, University of Geneva, Univerity of Lausanne, 30 quai Ernest-Ansermet, CH-1211, Geneva, Switzerland; †
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Johansen KT, Ebild SJ, Christensen SB, Godejohann M, Jaroszewski JW. Alkaloid analysis by high-performance liquid chromatography-solid phase extraction-nuclear magnetic resonance: New strategies going beyond the standard. J Chromatogr A 2012. [DOI: 10.1016/j.chroma.2012.10.072] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Analysis of alkaloids from different chemical groups by different liquid chromatography methods. OPEN CHEM 2012. [DOI: 10.2478/s11532-012-0037-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractAlkaloids are biologically active compounds widely used as pharmaceuticals and synthesised as secondary methabolites in plants. Many of these compounds are strongly toxic. Therefore, they are often subject of scientific interests and analysis. Since alkaloids — basic compounds appear in aqueous solutions as ionized and unionized forms, they are difficult for chromatographic separation for peak tailing, poor systems efficiency, poor separation and poor column-to-column reproducibility. For this reason it is necessity searching of more suitable chromatographic systems for analysis of the compounds. In this article we present an overview on the separation of selected alkaloids from different chemical groups by liquid chromatography thus indicating the range of useful methods now available for alkaloid analysis. Different selectivity, system efficiency and peaks shape may be achieved in different LC methods separations by use of alternative stationary phases: silica, alumina, chemically bonded stationary phases, cation exchange phases, or by varying nonaqueous or aqueous mobile phase (containing different modifier, different buffers at different pH, ion-pairing or silanol blocker reagents). Developments in TLC (NP and RP systems), HPLC (NP, RP, HILIC, ion-exchange) are presented and the advantages of each method for alkaloids analysis are discussed.
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Humam M, Shoul T, Jeannerat D, Muñoz O, Christen P. Chirality and numbering of substituted tropane alkaloids. Molecules 2011; 16:7199-209. [PMID: 21869748 PMCID: PMC6264358 DOI: 10.3390/molecules16097199] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2011] [Revised: 08/16/2011] [Accepted: 08/17/2011] [Indexed: 11/17/2022] Open
Abstract
The strict application of IUPAC rules for the numbering of tropane alkaloids is not always applied by authors and there is hence a lot of confusion in the literature. In most cases, the notation of 3, 6/7-disubstituted derivatives has been chosen arbitrarily, based on NMR and MS data, without taking into account the absolute configuration of these two carbons. This paper discusses the problem and the relevance of CD and NMR to determine molecular configurations. We report on the use of (1)H-NMR anisochrony (Δδ) induced by the Mosher's chiral auxiliary reagents (R)-(-)- and (S)-(+)-α-methoxy-α-trifluoromethyl-phenylacetyl chlorides (MTPA-Cl), to determine the absolute configuration of (3R,6R)-3α-hydroxy-6β-senecioyloxytropane, a disubstituted tropane alkaloid isolated from the aerial parts of Schizanthus grahamii (Solanaceae). These analytical tools should help future works in correctly assigning the configuration of additional 3, 6/7 disubstituted tropane derivatives.
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Affiliation(s)
- Munir Humam
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland; (M.H.); (T.S.)
| | - Tarik Shoul
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland; (M.H.); (T.S.)
| | - Damien Jeannerat
- Department of Organic Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland;
| | - Orlando Muñoz
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile;
| | - Philippe Christen
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland; (M.H.); (T.S.)
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Humam M, Kehrli T, Jeannerat D, Muñoz O, Hostettmann K, Christen P. Schizanthines N, O, and P, tropane alkaloids from the aerial parts of Schizanthus tricolor. JOURNAL OF NATURAL PRODUCTS 2011; 74:50-53. [PMID: 21171571 DOI: 10.1021/np1005423] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Three tropane alkaloids, named schizanthines N, O, and P (1-3), have been isolated from the crude alkaloid extract of the endemic Chilean plant Schizanthus tricolor. On the basis of extensive NMR studies and MS fragmentation analysis, their structures were determined to be 3α-(E)-4-hydroxysenecioyloxy-6β-angeloyloxytropane (1), 3α-(E)-4-hydroxysenecioyloxy-6β-senecioyloxytropane (2), and 3α-mesaconyloxy-6β-senecioyloxytropane (3). Compounds 1 and 2 are the first isomeric alkaloids in the tropane series possessing a hydroxysenecioyl substituent as an esterifying moiety.
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Affiliation(s)
- Munir Humam
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland
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Kühnle M, Kreidler D, Holtin K, Czesla H, Schuler P, Schurig V, Albert K. Online coupling of enantioselective capillary gas chromatography with proton nuclear magnetic resonance spectroscopy. Chirality 2010; 22:808-12. [PMID: 20803744 DOI: 10.1002/chir.20840] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The hyphenation of enantioselective capillary gas chromatography and mass spectrometry is not always sufficient to distinguish between structural isomers, thus requiring peak identification by NMR spectroscopy. Here the first online coupling of enantioselective capillary gas chromatography with proton nuclear resonance spectroscopy is described for the unfunctionalized chiral alkane 2,4-dimethylhexane resolved on octakis(6-O-methyl-2,3-di-O-pentyl)-gamma-cyclodextrin at 60 degrees C. NMR allows constitutional and configurational isomers (diastereomers and enantiomers) to be distinguished. Enantiomers display identical spectra at different retention times, which enable an indirect identification of these unfunctionalized alkanes. The presented method is still at an early development stage, and will require instrumental optimization in the future.
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Affiliation(s)
- Maximilian Kühnle
- Institute of Organic Chemistry, University of Tübingen, Tübingen D-72076, Germany
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Cretton S, Glauser G, Humam M, Jeannerat D, Muñoz O, Maes L, Christen P, Hostettmann K. Isomeric tropane alkaloids from the aerial parts of Schizanthus tricolor. JOURNAL OF NATURAL PRODUCTS 2010; 73:844-847. [PMID: 20166702 DOI: 10.1021/np900780w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Investigation of the aerial parts of Schizanthus tricolor yielded seven isomeric tropane alkaloids: 3alpha-(1-methylitaconyl)-6beta-senecioyloxytropane (1), 3alpha-(1-methylitaconyl)-6beta-angeloyloxytropane (2), 3alpha-(1-methylmesaconyl)-6beta-senecioyloxytropane (3), 3alpha-(1-methylmesaconyl)-6beta-angeloyloxytropane (4), 3alpha-(1-methylmesaconyl)-6beta-tigloyloxytropane (5), 3alpha-(1-methylcitraconyl)-6beta-senecioyloxytropane (6), and 3alpha-(1-methylcitraconyl)-6beta-angeloyloxytropane (7). Their structures were established by NMR including (1)H, (13)C NMR, HSQC, HMBC, COSY, and NOESY experiments, UV, IR, and mass spectrometry. Compounds 1, 6, and 7 are new to the literature. Alkaloids 1, 3, 4, and 5 and a mixture of 3, 4, and 5 were evaluated for in vitro antiplasmodial and cytotoxic activity. Compounds 1, 4, and 5 showed marginal inhibition of Plasmodium falciparum strain K1 with IC(50) values of 22.8, 24.8, and 36.0 microM and displayed no cytotoxicity on MRC-65 cells (CC(50) > 64 microM). Alkaloid 3 was inactive (IC(50) 63.5 microM). The alkaloid mixture exhibited slightly higher activity (IC(50) 17.0 microM) than the pure compounds, indicating some synergy between the different isomers.
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Affiliation(s)
- Sylvian Cretton
- School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, Quai Ernest-Ansermet 30, CH-1211 Geneva 4, Switzerland
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Jousse C, Vu TD, Tran TLM, Al Balkhi MH, Molinié R, Boitel-Conti M, Pilard S, Mathiron D, Hehn A, Bourgaud F, Gontier E. Tropane alkaloid profiling of hydroponic Datura innoxia Mill. Plants inoculated with Agrobacterium rhizogenes. PHYTOCHEMICAL ANALYSIS : PCA 2010; 21:118-127. [PMID: 19904728 DOI: 10.1002/pca.1180] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
INTRODUCTION Hydroponics has been shown as a possible way to produce high quality plant biomass with improved phytochemical levels. Nevertheless, effects of plant biotic and abiotic environment can lead to drastic changes and plant growth conditions must be optimised. OBJECTIVE To evaluate how much microbes and Agrobacterium rhizogenes TR7 wild strain may affect the tropane alkaloid profile in Datura innoxia Mill. plants cultivated in hydroponic conditions. METHODOLOGY Datura innoxia Mill. plants were cultivated in hydroponic with sterile or non-sterile conditions. For half of the non-sterile plants, Agrobacterium rhizogenes TR7 strain was added to the nutrient solution for hydroponics. The tropane alkaloid content of leaves and roots was analysed by UFLC/ESI-HRMS and MS/MS. The metabolite profiles were compared using partial least square-discriminant analysis. RESULTS In sterile conditions, aerial parts contained more scopolamine than the roots. However, the diversity of tropane alkaloids was greater in roots. Furthermore, 21 known compounds and four non-elucidated tropane alkaloids were found. The tropane alkaloid profile was shown to be statistically different between sterile and non-sterile hydroponic conditions. The levels of 3-acetoxy-6-hydroxytropane and 3-hydroxylittorine were higher in plants inoculated with A. rhizogenes. Five other tropane compounds were found in higher amounts in non-axenic control plants. Hyoscyamine and scopolamine total contents were much higher in the whole plant co-cultivated with A. rhizogenes TR7 than in controls. Furthermore, the leaves and roots of axenic plants contained more alkaloids than non-sterile ones. CONCLUSION In hydroponic conditions, microbes induced variations of the phytochemical levels. Addition of A. rhizogenes TR7 into the nutrient solutions improved the total hyoscyamine and scopolamine production.
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Affiliation(s)
- Cyril Jousse
- Plant and Insect Biology Research Unit EA3900 BioPI-UPJV, University of Picardy Jules Verne, UFR Sciences, 33 rue Saint Leu, 80039 Amiens cedex, France.
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Christen P, Bieri S, Muñoz O. Characterization of Positional and Configurational Tropane Alkaloid Isomers by Combining GC with NPD, MS and FTIR. Nat Prod Commun 2009. [DOI: 10.1177/1934578x0900401006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A purified stem bark extract from Schizanthus grahamii was analyzed by combining capillary gas chromatography with a selective nitrogen phosphorus detector, mass spectrometry and Fourier transform infrared spectroscopy. Several positional and configurational tropane isomers were detected and their structural elucidation was tentatively determined based on mass spectra and confirmed by vapor phase infrared spectra. Electron impact mass spectra of the isomeric alkaloids were virtually superimposable, whereas the corresponding infrared spectra differed markedly. Retention indices were established under isothermal and temperature program conditions for further peak assignment and identification. In order to point out possible artifacts in the hot and surface-active injection port, different sample introduction techniques were evaluated, namely split, splitless and on-column injections.
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Affiliation(s)
- Philippe Christen
- Laboratory of Pharmacognosy and Phytochemistry, School of Pharmaceutical Sciences, University of Geneva, University of Lausanne, 30 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Stefan Bieri
- Official Food Control Authority of Geneva, 22 Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland
| | - Orlando Muñoz
- Universidad de Chile, Departamento de Quimica, Facultad de Ciencias, Casilla 653, Santiago, Chile
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Staerk D, Kesting JR, Sairafianpour M, Witt M, Asili J, Emami SA, Jaroszewski JW. Accelerated dereplication of crude extracts using HPLC-PDA-MS-SPE-NMR: quinolinone alkaloids of Haplophyllum acutifolium. PHYTOCHEMISTRY 2009; 70:1055-1061. [PMID: 19540540 DOI: 10.1016/j.phytochem.2009.05.004] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 04/15/2009] [Accepted: 05/14/2009] [Indexed: 05/27/2023]
Abstract
Direct hyphenation of analytical-scale high-performance liquid chromatography, photo-diode array detection, mass spectrometry, solid-phase extraction and nuclear magnetic resonance spectroscopy (HPLC-PDA-MS-SPE-NMR) has been used for accelerated dereplication of crude extract of Haplophyllum acutifolium (syn. Haplophyllum perforatum). This technique allowed fast on-line identification of six quinolinone alkaloids, named haplacutine A-F, as well as of acutine, haplamine, eudesmine, and 2-nonylquinolin-4(1H)-one. Acutine and haplacutine E, isolated by preparative-scale HPLC, showed moderate antiplasmodial activity with IC(50) values of 2.17+/-0.22 microM and 3.79+/-0.24 microM, respectively (chloroquine-sensitive Plasmodium falciparum 3D7 strain).
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Affiliation(s)
- Dan Staerk
- Department of Medicinal Chemistry, Faculty of Pharmaceutical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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Moco S, Schneider B, Vervoort J. Plant Micrometabolomics: The Analysis of Endogenous Metabolites Present in a Plant Cell or Tissue. J Proteome Res 2009; 8:1694-703. [DOI: 10.1021/pr800973r] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sofia Moco
- Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, and Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany
| | - Bernd Schneider
- Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, and Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany
| | - Jacques Vervoort
- Laboratory of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, and Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany
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Arráez-Román D, Zurek G, Bäßmann C, Segura-Carretero A, Fernández-Gutiérrez A. Characterization ofAtropa belladonna L. compounds by capillary electrophoresis-electrospray ionization-time of flight-mass spectrometry and capillary electrophoresis-electrospray ionization-ion trap-mass spectrometry. Electrophoresis 2008; 29:2112-6. [DOI: 10.1002/elps.200700468] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
The Solanaceae is comprised of some 2500 species of cosmopolitan plants, especially native to the American continent. They have great value as food, like the well-known potato, tomato and eggplants, and medicines, like species of Atropa, Withania and Physalis, but many plants of this family are toxic, and sometimes lethal to mammals, in particular to man. Some of them also produce hallucinations and perceptual changes. The toxic species of this family are characterized by the occurrence of a variety of chemical compounds, some of which are responsible for the toxicity and lethality observed after ingestion, while others are suspected to be toxic. In this review, the following toxic compounds belonging to different members of the Solanaceae family are described: Tropane alkaloids ( Atropa, Datura, Hyoscyamus, Mandragora); pyrrolidine and pyrrolic alkaloids ( Nierembergia, Physalis, Solanum); protoalkaloids ( Nierembergia); glycoalkaloids ( Lycopersicon, Solanum); nicotine ( Nicotiana); cardenolides ( Cestrum, Nierembergia); capsaicinoids ( Capsicum); kaurene-type tetracyclic diterpenes ( Cestrum); steroidal glycosides ( Cestrum, Solanum); 1,25-dihydroxyvitamin D3 and vitamin D3 ( Cestrum, Solanum, Nierembergia); and withasteroids, withanolides ( Withania), and physalins ( Physalis). Other bioactive chemical constituents of members of this family are sugar esters and lectins. Phenylpropanoids are not included in this paper.
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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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Affiliation(s)
- R K Gilpin
- Brehm Research Laboratory, University Park, Wright State University, Fairborn, Ohio 45324-2031, USA
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Baker DD, Chu M, Oza U, Rajgarhia V. The value of natural products to future pharmaceutical discovery. Nat Prod Rep 2007; 24:1225-44. [PMID: 18033577 DOI: 10.1039/b602241n] [Citation(s) in RCA: 207] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Natural products have provided considerable value to the pharmaceutical industry over the past half century. In particular, the therapeutic areas of infectious diseases and oncology have benefited from numerous drug classes derived from natural product sources. Unfortunately, pharmaceutical companies have significantly decreased activities in natural product discovery during the past several years. Biotechnology companies working in the fields of combinatorial biosynthesis, genetic engineering and metagenomic approaches to identify novel natural product lead molecules have had limited success. Despite what appears to be a slow death of natural product discovery research, many new and interesting molecules with biological activity have been published in the past few years. If natural product materials continue to be tested for desirable therapeutic activities, we believe that significant progress in identifying new antibiotics, oncology therapeutics and other useful medicines will be made.
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Affiliation(s)
- Dwight D Baker
- Cubist Pharmaceuticals, Inc., 65 Hayden Avenue, Lexington, Massachusetts 02421, USA.
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Lam SH, Wang CY, Chen CK, Lee SS. Chemical investigation of Phyllanthus reticulatus by HPLC-SPE-NMR and conventional methods. PHYTOCHEMICAL ANALYSIS : PCA 2007; 18:251-5. [PMID: 17500369 DOI: 10.1002/pca.979] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Eight compounds, including two flavonoid glycosides, were isolated from the butanol-soluble fraction of the methanolic extract of the leaves of Phyllanthus reticulatus by conventional methods. A polyphenol rich fraction, obtained by Sephadex LH-20 fractionation, was also studied using an HPLC-SPE-NMR technique leading to the characterization of six compounds including three additional flavonoid glycosides. The latter approach used only 1 mg of samples, theoretically equivalent to 0.3 g of dry leaves. This study demonstrates that HPLC-SPE-NMR is very useful for thorough chemical investigation and also offers the advantages of saving time, plant materials and consumables over more conventional methods.
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Affiliation(s)
- Sio-Hong Lam
- School of Pharmacy, College of Medicine, National Taiwan University, Taipei, Taiwan
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Seger C, Godejohann M, Spraul M, Stuppner H, Hadacek F. Reaction product analysis by high-performance liquid chromatography-solid-phase extraction-nuclear magnetic resonance. J Chromatogr A 2006; 1136:82-8. [PMID: 17027010 DOI: 10.1016/j.chroma.2006.09.058] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2006] [Revised: 09/13/2006] [Accepted: 09/19/2006] [Indexed: 11/28/2022]
Abstract
The absolute configuration of secondary hydroxy functions of seven natural occurring polyyne derivatives has been elucidated by the application of Mosher method of diastereomeric methoxy-2-trifluoromethyl-phenylacetyl (MTPA) ester formation. High-performance liquid chromatography with diode array detection (HPLC-DAD) of the reaction mixture using a water/acetonitrile gradient allowed monitoring the reaction progress. Coupling of high-performance liquid chromatography to solid-phase extraction combined with nuclear magnetic resonance (HPLC-SPE-NMR) was utilized to generate highly reproducible (1)H and (19)F NMR data needed as input for the absolute configuration determination based on the analysis of relative shift differences. Chromatographic peaks of reaction substrates and reaction products bearing less 10mug analyte were trapped on SPE cartridges with the aid of water as makeup solvent. Deuterated chloroform was used to elute and transfer the peak content from the SPE to the 60mul flow cell of a 500MHz NMR spectrometer. For each analyte (1)H NMR spectra were obtained within 15min. Additionally (19)F NMR spectra were recorded for selected analytes in the same timeframe. Based on the obtained NMR data, the absolute configuration of all polyynes under investigation was successfully designated.
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Affiliation(s)
- Christoph Seger
- Institute of Pharmacy, Center of Molecular Biosciences, Leopold Franzens University Innsbruck, Innrain 52, A-6020 Innsbruck, Austria.
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