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Cretton S, Genta-Jouve G, Kaiser M, Mäser P, Muñoz O, Bürgi T, Cuendet M, Christen P. Hygroline derivatives from Schizanthus tricolor and their anti-trypanosomatid and antiplasmodial activities. PHYTOCHEMISTRY 2021; 192:112957. [PMID: 34563977 DOI: 10.1016/j.phytochem.2021.112957] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/13/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
Chemical investigation of the alkaloid extract of the aerial parts of Schizanthus tricolor led to the targeted isolation of 26 hygroline derivatives of which 20 were fully characterized. They have not yet been described in the literature and their structures were established by 1D and 2D NMR, UV and IR spectroscopy, and HRESIMS. The configuration was determined by Gauge-Independent Atomic Orbital NMR chemical shift calculations supported by the advanced statistical method DP4 plus, vibrational circular dichroism, and measurement of optical rotation. Their anti-trypanosomatid, antiplasmodial and cytotoxic activities were measured. Several compounds exhibited low micromolar activity against Plasmodium falciparum. None of the identified molecules was cytotoxic.
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Affiliation(s)
- Sylvian Cretton
- School of Pharmaceutical Sciences, University of Geneva, 1211, Geneva, 4, Switzerland; Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211, Geneva, 4, Switzerland.
| | - Grégory Genta-Jouve
- Laboratoire Ecologie, Evolution, Interactions des Systèmes Amazoniens (LEEISA), USR 3456, Université De Guyane, CNRS Guyane, 97300, Cayenne, French Guyana, France
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute, 4002, Basel, Switzerland; University of Basel, 4003, Basel, Switzerland
| | - Pascal Mäser
- Swiss Tropical and Public Health Institute, 4002, Basel, Switzerland; University of Basel, 4003, Basel, Switzerland
| | - Orlando Muñoz
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile
| | - Thomas Bürgi
- Department of Physical Chemistry, University of Geneva, 1211, Geneva, 4, Switzerland
| | - Muriel Cuendet
- School of Pharmaceutical Sciences, University of Geneva, 1211, Geneva, 4, Switzerland; Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211, Geneva, 4, Switzerland
| | - Philippe Christen
- School of Pharmaceutical Sciences, University of Geneva, 1211, Geneva, 4, Switzerland; Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, 1211, Geneva, 4, Switzerland
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Tapping into Synchrotron and Benchtop Circular Dichroism Spectroscopy for Expanding Studies of Complex Polysaccharides and their Interactions in Anoxic Archaeological Wood. HERITAGE 2019. [DOI: 10.3390/heritage2010009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Circular dichroism (CD) (and synchrotron circular dichroism (SCD)) spectroscopy is a rapid, highly sensitive technique used to investigate structural conformational changes in biomolecules in response to interactions with ligands in solution and in film. It is a chiroptical method and at least one of the interacting molecules must possess optical activity (or chirality). In this review, we compare the capabilities of CD and SCD in the characterisation of celluloses and lignin polymers in archaeological wood. Cellulose produces a range of spectral characteristics dependent on environment and form; many of the reported transitions occur in the vacuum-ultraviolet region (< 180 nm) most conveniently delivered using a synchrotron source. The use of induced CD in which achiral dyes are bound to celluloses to give shifted spectra in the visible region is also discussed, together with its employment to identify the handedness of the chiral twists in nanocrystalline cellulose. Lignin is one target for the design of future consolidants that interact with archaeological wood to preserve it. It is reportedly achiral, but here we review several studies in which CD spectroscopy has successfully revealed lignin interactions with chiral enzymes, highlighting the potential usefulness of the technique in future research to identify new generation consolidants.
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Lu X, Li H, Nafie JW, Pazderka T, Pazderková M, Dukor RK, Nafie LA. A Vibrational Circular Dichroism Microsampling Accessory: Mapping Enhanced Vibrational Circular Dichroism in Amyloid Fibril Films. APPLIED SPECTROSCOPY 2017; 71:1117-1126. [PMID: 28436688 DOI: 10.1177/0003702817701457] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report the first vibrational circular dichroism (VCD) measurement of spatial heterogeneity in a sample using infrared (IR) microsampling. Vibrational circular dichroism spectra are typically measured using a standard IR cell with an IR beam diameter of 10 mm or greater making it impossible to investigate the spatial heterogeneity of a solid film sample. We have constructed a VCD sampling assembly with either 3 mm or 1 mm spatial resolution. An XY-translation stage was used to measure spectra at different spatial locations producing IR and VCD maps of the sample. In addition, a rotating sample stage was employed using a dual photoelastic modulator (PEM) setup to suppress artifacts due to linear birefringence in solid-phase or film samples. Infrared and VCD mapping of an insulin fibril film has been carried out at both 3 and 1 mm spatial resolution, and lysozyme films were mapped at 1 mm resolution. The IR spectra of different spots vary in intensity due primarily to sample thickness. The changes in the VCD intensity across the map largely correlate to corresponding changes in the IR map. Closer inspection of the insulin map revealed changes in the relative intensities of the VCD spectra not present in the parent IR spectra, which indicated differences in the degree of supramolecular chirality of the fibrils in the various spatial regions. For lysozyme films, in addition to different degrees of supramolecular chirality, reversal of the net fibril chirality was observed. The large signal-to-noise ratio observed at 1 mm resolution implies the feasibility of further increasing the spatial resolution by one or two orders of magnitude for protein fibril film samples.
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Affiliation(s)
| | | | | | - Tomáš Pazderka
- 2 Institute of Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
| | - Markéta Pazderková
- 2 Institute of Physics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
| | | | - Laurence A Nafie
- 1 BioTools Inc., Jupiter, FL, USA
- 3 Department of Chemistry, Syracuse University, Syracuse, NY, USA
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Miyake H, Terada K, Tsukube H. Lanthanide Tris(β-diketonates) as Useful Probes for Chirality Determination of Biological Amino Alcohols in Vibrational Circular Dichroism: Ligand to Ligand Chirality Transfer in Lanthanide Coordination Sphere. Chirality 2014; 26:293-9. [DOI: 10.1002/chir.22319] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 02/07/2014] [Accepted: 02/11/2014] [Indexed: 01/21/2023]
Affiliation(s)
- Hiroyuki Miyake
- Department of Chemistry, Graduate School of Science; Osaka City University; Sugimoto, Sumiyoshi-ku Osaka Japan
| | - Keiko Terada
- Department of Chemistry, Graduate School of Science; Osaka City University; Sugimoto, Sumiyoshi-ku Osaka Japan
| | - Hiroshi Tsukube
- Department of Chemistry, Graduate School of Science; Osaka City University; Sugimoto, Sumiyoshi-ku Osaka Japan
- JST, CREST; Osaka City University; Sugimoto, Sumiyoshi-ku Osaka Japan
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Taniguchi T, Usuki T. Circular Dichroism SpectroscopyDedicated to Professor Koji Nakanishi on the occasion of his 85th birthday. Supramol Chem 2012. [DOI: 10.1002/9780470661345.smc029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kikuchi S, Yoshida S, Sugawara Y, Yamada W, Cheng HM, Fukui K, Sekine K, Iwakura I, Ikeno T, Yamada T. Silver-Catalyzed Carbon Dioxide Incorporation and Rearrangement on Propargylic Derivatives. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2011. [DOI: 10.1246/bcsj.20110078] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Nakahashi A, Yaguchi Y, Miura N, Emura M, Monde K. A vibrational circular dichroism approach to the determination of the absolute configurations of flavorous 5-substituted-2(5H)-furanones. JOURNAL OF NATURAL PRODUCTS 2011; 74:707-711. [PMID: 21381697 DOI: 10.1021/np1007763] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Sotolon (1) and maple furanone (2) are naturally occurring chiral furanones. These 5-substituted-2(5H)-furanones are industrially significant aroma compounds due to their characteristic organoleptic properties and extraordinarily low odor thresholds. Each enantiomer of 1 and 2 was successfully obtained by preparative enantioselective supercritical fluid chromatography. The absolute configuration of 1 was confirmed as (R)-(-)-1 and (S)-(+)-1 by adopting the vibrational circular dichroism (VCD) approach. The absolute configuration of 2, which has remained ambiguous since its discovery in 1957, was determined as (R)-(+)-2 and (S)-(-)-2 for the first time by the VCD technique. Surprisingly, the signs of the optical rotation of 2 are opposite of those of 1 regardless of their identical absolute configurations. This observation emphasizes the risk in absolute configurational assignments based on comparison of optical rotation signs of similar structures. Odor evaluation of the enantiomers of 2 revealed different odor intensities.
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Affiliation(s)
- Atsufumi Nakahashi
- Faculty of Advanced Life Science, Frontier Research Center for the Post-Genome Science and Technology, Hokkaido University, Kita 21, Nishi11, Sapporo 001-0021, Japan
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Kuwahara S, Obata K, Fujita T, Miura N, Nakahashi A, Monde K, Harada N. (R)-(+)-[VCD(-)984]-4-Ethyl-4-methyloctane: A Cryptochiral Hydrocarbon with a Quaternary Chiral Center. (2) Vibrational CD Spectra of Both Enantiomers and Absolute Configurational Assignment. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000778] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Monde K, Nakahashi A, Miura N, Yaguchi Y, Sugimoto D, Emura M. Stereochemical study of a novel tautomeric furanone, homofuraneol. Chirality 2010; 21 Suppl 1:E110-5. [PMID: 19899151 DOI: 10.1002/chir.20788] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A mixture of tautomers with unique keto-enol structures, 5-ethyl-4-hydroxy-2-methylfuran-3(2H)-one and 2-ethyl-4-hydroxy-5-methylfuran-3(2H)-one (EHMF, homofuraneol, 1a and 1b), comprises four structural isomers including their enantiomers. The four isomers were successfully separated by chromatographic optical resolution, and their odor evaluation was performed. Determination of the absolute chemistry of 1a and 1b were accomplished for the first time by direct measurement of the VCD spectra of their methyl ether derivatives 4a and 4b compared with the calculated ones as well as chemical relay reaction. The relationship between odor characteristics and stereochemistry was also examined.
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Affiliation(s)
- Kenji Monde
- Faculty of Advanced Life Science, Frontier Research Center for the Post-Genome Science and Technology, Hokkaido University, Sapporo, Japan.
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Yoshida S, Fukui K, Kikuchi S, Yamada T. Silver-Catalyzed Enantioselective Carbon Dioxide Incorporation into Bispropargylic Alcohols. J Am Chem Soc 2010; 132:4072-3. [DOI: 10.1021/ja1007118] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shunsuke Yoshida
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Kosuke Fukui
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Satoshi Kikuchi
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
| | - Tohru Yamada
- Department of Chemistry, Keio University, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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An DL, Chen Q, Fang J, Yan H, Orita A, Miura N, Nakahashi A, Monde K, Otera J. Vibrational CD spectroscopy as a powerful tool for stereochemical study of cyclophynes in solution. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.01.095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yaguchi Y, Nakahashi A, Miura N, Sugimoto D, Monde K, Emura M. Stereochemical study of chiral tautomeric flavorous furanones by vibrational circular dichroism. Org Lett 2008; 10:4883-5. [PMID: 18817404 DOI: 10.1021/ol801966t] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
2-Substituted-3(2H)-furanone derivatives are industrially significant aroma compounds possessing a unique keto-enol tautomeric feature causing their racemization. Absolute configurations of two flavorous furanones, which have remained unclear for the past 40 years since their discovery, were clarified by the vibrational circular dichroism technique as well as chemical relay reactions. Odor evaluation of each enantiomer revealed relationships between their configurations and their odor activities.
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Affiliation(s)
- Yoshihiro Yaguchi
- Corporate Research and Development Division, Takasago International Corporation, 4-11, 1-Chome, Nishi-yawata, Hiratsuka city, Kanagawa 254-0073, Japan
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Nakahashi A, Taniguchi T, Miura N, Monde K. Stereochemical studies of sialic acid derivatives by vibrational circular dichroism. Org Lett 2007; 9:4741-4. [PMID: 17935341 DOI: 10.1021/ol702042m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Systematic VCD studies of N-acetylneuraminic acid (Neu5Ac), a recognition-related unique carbohydrate, were performed for the first time. Two pairs of anomeric isomers regarding a quaternary C2 asymmetric carbon of Neu5Ac derivatives were synthesized. VCD spectral patterns around the ester carbonyl region, as well as other Mid-IR regions, would be practical markers to distinguish the C2 stereochemistry.
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Affiliation(s)
- Atsufumi Nakahashi
- Graduate School of Advanced Life Science, Frontier Research Center for Post-Genome Science and Technology, Hokkaido University, Kita-ku, Sapporo, Japan
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Taniguchi T, Monde K. Spectrum–Structure Relationship in Carbohydrate Vibrational Circular Dichroism and Its Application to Glycoconjugates. Chem Asian J 2007; 2:1258-66. [PMID: 17768735 DOI: 10.1002/asia.200700180] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Preliminary reports of the nature of the vibrational circular dichroism (VCD) peak at around 1145 cm(-1), which is characteristic of axial glycosidic sugars and is called the glycoside band (J. Am. Chem. Soc. 2004, 126, 9496), have been thoroughly examined. Through systematic carbohydrate measurements, it was found that the sign of the glycoside band reflects not only the anomeric configuration but also the pyranose conformation. Isotope and theoretical studies characterized its vibrational mode as C1-H1 deformation coupled with C1-O1 stretching, which indicates its applicability to more-complicated glycoconjugates. In this study, for the first time, carbohydrate VCD spectra were reliably predicted by means of density functional theory (DFT) calculations. The VCD technique was applied to glycopeptides, and simultaneous analysis of both the carbohydrate and aglycan parts was carried out.
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Affiliation(s)
- Tohru Taniguchi
- Laboratory of Advanced Chemical Biology, Graduate School of Advanced Life Science, Frontier Research Center for Post-Genome Science and Technology, Hokkaido University, Kita-ku, Sapporo 001-0021, Japan
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Taniguchi T, Tone I, Monde K. Observation and characterization of a specific vibrational circular dichroism band in phenyl glycosides. Chirality 2007; 20:446-53. [PMID: 17853396 DOI: 10.1002/chir.20465] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Application of vibrational circular dichroism (VCD) spectroscopy to structural analysis of carbohydrates has recently progressed. However, few studies on glycoconjugates VCD have thus far been reported, despite the fact that naturally occurring carbohydrates exist as various glycoconjugates. To further explore the application of the VCD technique, we have measured a series of aromatic glycosides and found that axial aromatic glycosides exhibited a negative band at around 1230 cm(-1) while equatorial ones showed flat features in this region. This is the first structure-spectra relationship on glycoconjugate VCD that distinguishes the stereochemistry of the sugar anomers. Several model compounds were prepared and their vibrational properties calculated by using the density functional theory (DFT) method, which assigned the vibrational mode of this band based on the stretching motion of the glycosidic oxygen and aromatic carbon. This concept that aglycan parts can reflect stereochemical information of sugar moieties may encourage further VCD studies on glycoconjugates to realize practical structural analysis of carbohydrates.
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Affiliation(s)
- Tohru Taniguchi
- Laboratory of Advanced Chemical Biology, Graduate School of Advanced Life Science, Frontier Research Center for Post-Genome Science and Technology, Hokkaido University, Kita-ku, Sapporo 001-0021, Japan
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