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Structural determination and pro-angiogenic effect of polysaccharide from the pollen of Typha angustifolia L. Int J Biol Macromol 2022; 222:2028-2040. [DOI: 10.1016/j.ijbiomac.2022.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 09/18/2022] [Accepted: 10/01/2022] [Indexed: 11/05/2022]
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Smith AJR, York R, Uhrín D, Bell NGA. 19F-centred NMR analysis of mono-fluorinated compounds. RSC Adv 2022; 12:10062-10070. [PMID: 35424946 PMCID: PMC8966657 DOI: 10.1039/d1ra08046f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 03/15/2022] [Indexed: 11/29/2022] Open
Abstract
Addressing limitations of the existing NMR techniques for the structure determination of mono-fluorinated compounds, we have developed methodology that uses 19F as the focal point of this process. The proposed 19F-centred NMR analysis consists of a complementary set of broadband, phase-sensitive NMR experiments that utilise the substantial sensitivity of 19F and its far reaching couplings with 1H and 13C to obtain a large number of NMR parameters. The assembled 1H, 13C and 19F chemical shifts, values of JHF, JHH, and JFC coupling constants and the size of 13C induced 19F isotopic shifts constitute a rich source of information that enables structure elucidation of fluorinated moieties and even complete structures of molecules. Here we introduce the methodology, provide a detailed description of each NMR experiment and illustrate their interpretation using 3-fluoro-3-deoxy-d-glucose. This novel approach performs particularly well in the structure elucidation of fluorinated compounds embedded in complex mixtures, eliminating the need for compound separation or use of standards to confirm the structures. It represents a major contribution towards the analysis of fluorinated agrochemicals and (radio)pharmaceuticals at any point during their lifetime, including preparation, use, biotransformation and biodegradation in the environment. The developed methodology can also assist with the investigations of the stability of fluoroorganics and their pharmacokinetics. Studies of reaction mechanisms using fluorinated molecules as convenient reporters of these processes, will also benefit. 19F is the focal point of broadband, phase-sensitive 2D NMR experiments that provide 1H, 13C and 19F chemical shifts, values of JHF, JHH, and JFC coupling constants and 13C-induced 19F isotopic shifts to elucidate structures of fluorinated molecules.![]()
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Affiliation(s)
- Alan J R Smith
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
| | - Richard York
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
| | - Dušan Uhrín
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
| | - Nicholle G A Bell
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
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Smith AJR, York R, Uhrín D, Bell NGA. New 19F NMR methodology reveals structures of molecules in complex mixtures of fluorinated compounds. Chem Sci 2022; 13:3766-3774. [PMID: 35432904 PMCID: PMC8966635 DOI: 10.1039/d1sc06057k] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Accepted: 02/25/2022] [Indexed: 11/24/2022] Open
Abstract
Although the number of natural fluorinated compounds is very small, fluorinated pharmaceuticals and agrochemicals are numerous. 19F NMR spectroscopy has a great potential for the structure elucidation of fluorinated organic molecules, starting with their production by chemical or chemoenzymatic reactions, through monitoring their structural integrity, to their biotic and abiotic transformation and ultimate degradation in the environment. Additionally, choosing to incorporate 19F into any organic molecule opens a convenient route to study reaction mechanisms and kinetics. Addressing limitations of the existing 19F NMR techniques, we have developed methodology that uses 19F as a powerful spectroscopic spy to study mixtures of fluorinated molecules. The proposed 19F-centred NMR analysis utilises the substantial resolution and sensitivity of 19F to obtain a large number of NMR parameters, which enable structure determination of fluorinated compounds without the need for their separation or the use of standards. Here we illustrate the 19F-centred structure determination process and demonstrate its power by successfully elucidating the structures of chloramination disinfectant by-products of a single mono-fluorinated phenolic compound, which would have been impossible otherwise. This novel NMR approach for the structure elucidation of molecules in complex mixtures represents a major contribution towards the analysis of chemical and biological processes involving fluorinated compounds. 19F-centred NMR structure determination protocol alleviates the need for compound separation. Disinfection byproducts of chloramination were unraveled by analyzing the reaction pathways of a single fluorinated molecule.![]()
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Affiliation(s)
- Alan J R Smith
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
| | - Richard York
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
| | - Dušan Uhrín
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
| | - Nicholle G A Bell
- EaStCHEM School of Chemistry, University of Edinburgh David Brewster Rd Edinburgh EH9 3FJ UK
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Shi Q, Yan J, Jiang B, Chi X, Wang J, Liang X, Ai X. A general strategy for the structural determination of carbohydrates by multi-dimensional NMR spectroscopies. Carbohydr Polym 2021; 267:118218. [PMID: 34119172 DOI: 10.1016/j.carbpol.2021.118218] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 05/01/2021] [Accepted: 05/14/2021] [Indexed: 11/19/2022]
Abstract
Two-dimensional NMR spectroscopies are one of the most frequently used techniques for the structural determination of carbohydrates. However, the data analysis is challenging because of the signal overlap in the 1H homonuclear correlation spectra. We attempted to explore a general strategy for the structural determination of carbohydrates by combined multi-dimensional spectroscopies. The strategy was applied to a human milk oligosaccharide lacto-N-difucohexaose I, that has been previously studied by conventional two-dimensional NMR spectroscopy. Assignment of the intra-residue resonances of the hexasaccharide using the three-dimensional spectrum was straightforward. Consequently, data analysis of the multi-dimensional spectra was significantly simplified, leading to a quicker determination of the intra- and inter-residue connections in the hexasaccharide. Application of the NMR strategy to chondroitin sulfate from bovine cartilage revealed two repeating disaccharide regions of the A and C units of chondroitin sulfate, indicating the high potential of this technique for the structural determination of complex polysaccharides.
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Affiliation(s)
- Qi Shi
- School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China; Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jingyu Yan
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Bin Jiang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China
| | - Xiujuan Chi
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jihui Wang
- School of Biological Engineering, Dalian Polytechnic University, Dalian 116034, China; School of Chemical Engineering and Energy Technology, Institute of Science and Technology Innovation, Dongguan University of Technology, Dongguan 523808, China.
| | - Xinmiao Liang
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
| | - Xuanjun Ai
- Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
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Xiao J, Wang Y, Yang Y, Liu J, Chen G, Lin B, Hou Y, Li N. Natural potential neuroinflammatory inhibitors from Stephania epigaea H.S. Lo. Bioorg Chem 2020; 107:104597. [PMID: 33450546 DOI: 10.1016/j.bioorg.2020.104597] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Revised: 12/22/2020] [Accepted: 12/22/2020] [Indexed: 12/23/2022]
Abstract
Stephania epigaea H. S. Lo is a folk medicine widely distributed in the south of China, especially in Yunnan and Guangxi province. An in vitro anti-neuroinflammatory study showed that total alkaloids of it can potently inhibit LPS-induced NO releasing of BV2 cells with an IC50 value of 10.05 ± 2.03 μg/mL (minocycline as the positive drug, IC50 15.49 ± 2.14 μM). The phytochemical investigation of the total alkaloids afforded three new phenanthrene (1-3), two lactams (4a, 4b), and nine aporphine derivatives (5-13). The final structure of 1 was identified by computer-assisted structure elucidation (ACD/Structure Elucidator software and the 13C NMR calculation with GIAO method) due to many possibilities of the substituent pattern. All isolates were evaluated for their anti-neuroinflammatory effects, and as a result, 5, 8, 10, and 11 exhibited stronger inhibitory activities than the minocycline. The results suggested S. epigaea could provide potential therapeutic agents for neurodegenerative diseases.
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Affiliation(s)
- Jiao Xiao
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, People's Republic of China
| | - Yingjie Wang
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, People's Republic of China
| | - Yanqiu Yang
- College of Life and Health Sciences, Northeastern University, Shenyang 110004, People's Republic of China
| | - Jingyu Liu
- College of Life and Health Sciences, Northeastern University, Shenyang 110004, People's Republic of China
| | - Gang Chen
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, People's Republic of China
| | - Bin Lin
- School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, People's Republic of China
| | - Yue Hou
- College of Life and Health Sciences, Northeastern University, Shenyang 110004, People's Republic of China.
| | - Ning Li
- School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, People's Republic of China.
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Sakas J, Bell NGA. Reduced dimensionality hyphenated NMR experiments for the structure determination of compounds in mixtures. Faraday Discuss 2019; 218:191-201. [PMID: 31155629 DOI: 10.1039/c9fd00008a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the structure determination of molecules in mixtures using NMR spectroscopy, the dispersion of 13C chemical shifts provides much needed separation of resonances in the indirectly detected dimension of 2D heterocorrelated NMR experiments. This separation is crucial for establishing networks of coupled spins by hyphenated techniques that combine hetero- and homonuclear polarisation transfers. However, as the sample complexity increases, 13C chemical shifts stop being unique, hindering spectral interpretation. The resulting ambiguities can be removed by adding another dimension to these experiments. However, the spectra obtained from complex samples are riddled with overlapped signals, meaning that another dimension will only reduce the spectral resolution and prevent structure determination. A promising solution is to stay in two dimensions and use the combined 13C and 1H chemical shifts to separate signals. We have developed a suite of (3,2)D reduced dimensionality hyphenated NMR experiments that preserve the information content of 3D spectra but offer all of the advantages of 2D spectra - high resolution and ease of manipulation with only a mild sensitivity penalty. The proposed experiments complement the existing (3,2)D HSQC-TOCSY and include a (3,2)D HSQC-NOESY/ROESY, (3,2)D HSQC-CLIP-COSY and (3,2)D HSQC-HSQMBC. The new experiments represent a set of NMR techniques typically employed in the structure determination of complex compounds and have been adopted here for use on mixtures. The resolving power of these experiments is illustrated on the analysis of hot water extracts of green tea.
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Affiliation(s)
- Justinas Sakas
- EaStCHEM School of Chemistry, University of Edinburgh, King's Buildings, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, UK.
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Becker J, Koos MRM, Schulze-Sünninghausen D, Luy B. ASAP-HSQC-TOCSY for fast spin system identification and extraction of long-range couplings. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2019; 300:76-83. [PMID: 30711785 DOI: 10.1016/j.jmr.2018.12.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 12/19/2018] [Accepted: 12/20/2018] [Indexed: 06/09/2023]
Abstract
Based on Ernst-angle-type excitation and Acceleration by Sharing Adjacent Polarization (ASAP), a fast HSQC-TOCSY experiment is introduced. In the approach, the DIPSI-2 isotropic mixing period of the ASAP-HSQC is simply shifted, which provides a TOCSY period without additional application of rf-energy. The ASAP-HSQC-TOCSY allows the acquisition of a conventional 2D in about 30 s. Alternatively, it allows the acquisition of highly carbon-resolved spectra (several Hz digital resolution) on the order of minutes. An ASAP-HSQC-TOCSY-IPAP variant, finally, allows the sign-sensitive extraction of heteronuclear long-range coupling constants from a pair of highly resolved spectra in less than an hour. Pulse sequences, several example spectra, and a discussion of results are given.
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Affiliation(s)
- Johanna Becker
- Institut für Organische Chemie and Institut für Biologische Grenzflächen, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Martin R M Koos
- Institut für Organische Chemie and Institut für Biologische Grenzflächen, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - David Schulze-Sünninghausen
- Institut für Organische Chemie and Institut für Biologische Grenzflächen, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany
| | - Burkhard Luy
- Institut für Organische Chemie and Institut für Biologische Grenzflächen, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, 76131 Karlsruhe, Germany.
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Ustyuzhanina NE, Bilan MI, Nifantiev NE, Usov AI. New insight on the structural diversity of holothurian fucosylated chondroitin sulfates. PURE APPL CHEM 2019. [DOI: 10.1515/pac-2018-1211] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Abstract
Fucosylated chondroitin sulfates (FCS) are unique glycosaminoglycans isolated from body walls of sea cucumbers (holothuria). These biopolymers are composed of a chondroitin core [→4)-β-D-GlcA-(1→3)-β-D-GalNAc-(1→]n bearing fucosyl branches and sulfate groups. Structural variations of FCS are species specific and depend on type, amount and position of branches, as well as on degree and pattern of sulfation of a backbone and branches. A wide spectrum of biological properties was determined for these polysaccharides including anticoagulant, antithrombotic, antitumor, anti-inflammatory activities. Structural features of FCS influence significantly on their biological effect. In this review recent data about structural variations within holothurian FCS are summarized. The NMR data of the key building blocks are presented, which may be used for the analysis of new FCS.
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Affiliation(s)
- Nadezhda E. Ustyuzhanina
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky Prospect 47 , Moscow 119991 , Russia
| | - Maria I. Bilan
- Laboratory of Carbohydrate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky Prospect 47 , Moscow 119991 , Russia
| | - Nikolay E. Nifantiev
- Laboratory of Glycoconjugate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky Prospect 47 , Moscow 119991 , Russia
| | - Anatolii I. Usov
- Laboratory of Carbohydrate Chemistry, N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences , Leninsky Prospect 47 , Moscow 119991 , Russia
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Song Y, Wang Q, Wang Q, He Y, Ren D, Liu S, Wu L. Structural characterization and antitumor effects of fucoidans from brown algae Kjellmaniella crassifolia farmed in northern China. Int J Biol Macromol 2018; 119:125-133. [PMID: 30041037 DOI: 10.1016/j.ijbiomac.2018.07.126] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 07/19/2018] [Accepted: 07/20/2018] [Indexed: 12/20/2022]
Abstract
Brown alga-derived fucoidan has been proven to have a variety of bioactivities. To explore the antitumor effect of fucoidan, Kjellmaniella crassifolia (farmed in Dalian, China)was enzymatically digested to obtain the crude extract (F), which was further separated into three fractions (F1, F2 and F3). The monosaccharide composition and structural characteristics of the isolated fractions were determined using high-performance liquid chromatography (HPLC), Fourier-transform infrared spectroscopy (FTIR) and 1D and 2D nuclear magnetic resonance (NMR) spectroscopy. F1 is an acetylated galactofucan, and F2 consists of fucose, galactose, mannose and glucuronic acid. F3 has two components, an acetylated galactofucan and a pure sulfated fucan. F, F1 and F2 showed limited cytotoxicity against murine hepatocarcinoma Hca-F cells in vitro. Oral administration of F at a dose of 450 mg/kg d significantly inhibited lump growth in Hca-F-inoculated mice and led to upregulated FAS expression in tumor tissues compared to that of the control. F1 and F2 did not show competitive antineoplastic efficacy, as did the crude extract. Crude fucoidan could be a promising antitumor adjuvant. The origin of its efficacy may be the small molecules, such as phenols that attached to native fucoidan. This theory needs to be further confirmed.
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Affiliation(s)
- Yuefan Song
- National R & D Branch Center for Seaweed Processing, Dalian 116023, PR China; Key Laboratory of Aquatic Product Processing and Utilization of Liaoning Province, Dalian 116023, PR China; College of Food Science and Engineering, Dalian Ocean University, Dalian 116023, PR China
| | - Qiukuan Wang
- National R & D Branch Center for Seaweed Processing, Dalian 116023, PR China; Key Laboratory of Aquatic Product Processing and Utilization of Liaoning Province, Dalian 116023, PR China; College of Food Science and Engineering, Dalian Ocean University, Dalian 116023, PR China.
| | - Qingjun Wang
- National R & D Branch Center for Seaweed Processing, Dalian 116023, PR China; Key Laboratory of Aquatic Product Processing and Utilization of Liaoning Province, Dalian 116023, PR China; College of Food Science and Engineering, Dalian Ocean University, Dalian 116023, PR China
| | - Yunhai He
- National R & D Branch Center for Seaweed Processing, Dalian 116023, PR China; Key Laboratory of Aquatic Product Processing and Utilization of Liaoning Province, Dalian 116023, PR China; College of Food Science and Engineering, Dalian Ocean University, Dalian 116023, PR China
| | - Dandan Ren
- National R & D Branch Center for Seaweed Processing, Dalian 116023, PR China; Key Laboratory of Aquatic Product Processing and Utilization of Liaoning Province, Dalian 116023, PR China; College of Food Science and Engineering, Dalian Ocean University, Dalian 116023, PR China
| | - Shu Liu
- National R & D Branch Center for Seaweed Processing, Dalian 116023, PR China; Key Laboratory of Aquatic Product Processing and Utilization of Liaoning Province, Dalian 116023, PR China; College of Food Science and Engineering, Dalian Ocean University, Dalian 116023, PR China
| | - Long Wu
- National R & D Branch Center for Seaweed Processing, Dalian 116023, PR China; Key Laboratory of Aquatic Product Processing and Utilization of Liaoning Province, Dalian 116023, PR China; College of Food Science and Engineering, Dalian Ocean University, Dalian 116023, PR China
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