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Lee S, Kim TW, Lee YH, Kang DM, Ryoo R, Ko YJ, Ahn MJ, Kim KH. Two New Fatty Acid Derivatives, Omphalotols A and B and Anti-Helicobacterpylori Fatty Acid Derivatives from Poisonous Mushroom Omphalotus japonicus. Pharmaceuticals (Basel) 2022; 15:ph15020139. [PMID: 35215253 PMCID: PMC8874359 DOI: 10.3390/ph15020139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 01/19/2022] [Accepted: 01/23/2022] [Indexed: 01/22/2023] Open
Abstract
As part of ongoing systematic research into the discovery of bioactive secondary metabolites with novel structures from Korean wild mushrooms, we investigated secondary metabolites from a poisonous mushroom, Omphalotus japonicus (Kawam.) Kirchm. & O. K. Mill. belonging to the family Marasmiaceae, which causes nausea and vomiting after consumption. The methanolic extract of O. japonicus fruiting bodies was subjected to the fractionation by solvent partition, and the CH2Cl2 fraction was analyzed for the isolation of bioactive compounds, aided by an untargeted liquid chromatography mass spectrometry (LC–MS)-based analysis. Through chemical analysis, five fatty acid derivatives (1–5), including two new fatty acid derivatives, omphalotols A and B (1 and 2), were isolated from the CH2Cl2 fraction, and the chemical structures of the new compounds were determined using 1D and 2D nuclear magnetic resonance (NMR) spectroscopy and high resolution electrospray ionization mass spectrometry (HR-ESIMS), as well as fragmentation patterns in MS/MS data and chemical reactions followed by the application of Snatzke’s method and competing enantioselective acylation (CEA). In the anti-Helicobacter pylori activity test, compound 1 showed moderate antibacterial activity against H. pylori strain 51 with 27.4% inhibition, comparable to that of quercetin as a positive control. Specifically, compound 3 exhibited the most significant antibacterial activity against H. pylori strain 51, with MIC50 and MIC90 values of 9 and 20 μM, respectively, which is stronger inhibitory activity than that of another positive control, metronidazole (MIC50 = 17 μM and MIC90 = 46 μM). These findings suggested the experimental evidence that the compound 3, an α,β-unsaturated ketone derivative, could be used as a moiety in the development of novel antibiotics against H. pylori.
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Affiliation(s)
- Seulah Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
- Division of Life Sciences, Korea Polar Research Institute, KIOST, Incheon 21990, Korea
| | - Tae Wan Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
| | - Yong Hoon Lee
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
| | - Dong-Min Kang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 52828, Korea; (D.-M.K.); (M.-J.A.)
| | - Rhim Ryoo
- Special Forest Products Division, Forest Bioresources Department, National Institute of Forest Science, Suwon 16631, Korea;
| | - Yoon-Joo Ko
- Laboratory of Nuclear Magnetic Resonance, National Center for Inter-University Research Facilities (NCIRF), Seoul National University, Gwanak-gu, Seoul 08826, Korea;
| | - Mi-Jeong Ahn
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University, Jinju 52828, Korea; (D.-M.K.); (M.-J.A.)
| | - Ki Hyun Kim
- School of Pharmacy, Sungkyunkwan University, Suwon 16419, Korea; (S.L.); (T.W.K.); (Y.H.L.)
- Correspondence: ; Tel.: +82-31-290-7700
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Beppu K, Saito D, Muguruma Y, Takahashi M, Harada S, Inoue K. Stable Isotope Labeling by Carbon-13 in Bacteria Culture for the Analysis of Residual Avermectin Using Stable Isotope Dilution Liquid Chromatography Tandem Mass Spectrometry. ANAL SCI 2021; 37:1385-1390. [PMID: 33716264 DOI: 10.2116/analsci.21p058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study describes the development of a new stable isotope labeling method by carbon-13 in bacteria culture (SILCB) for the analysis of residual antibiotics via liquid chromatography with tandem mass spectrometry (LC-MS/MS). Stable isotope dilution (SID) LC-MS/MS with QuEChERS was employed to determine avermectin, particularly avermectin B1a (AV-a) and B1b (AV-b), based on completely 13C-labeled internal standards (13C-ISs) obtained from the SILCB. Our SILCB was developed from an optimal inorganic medium using 13C6-glucose for Streptomyces avermitilis (14893 strain). A rough extract containing 13C-ISs was purified via high-speed countercurrent chromatography with a volatile two-phase solvent system composed of n-hexane/ethyl acetate/methanol/0.5% formic acid in water (7/3/5/5/, V/V). The purified 13C-ISs were evaluated to confirm the presence of completely 13C-labeled ions with m/z 938 > 326 and m/z 923 > 309 for AV-a and AV-b, respectively. The QuEChERS approach with the 13C-ISs procedure achieved acceptable recovery rates in beef meat samples of 99.5 - 100.0% (RSD < 2.0%, n = 6). For the analysis of residual antibiotics in foodstuffs by SID-LC-MS/MS and QuEChERS, the SILCB represents a significant improvement over previous methods suffering from cumbersome sample preparation and matrix effects.
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Affiliation(s)
- Kodai Beppu
- College of Pharmaceutical Sciences, Ritsumeikan University
| | - Daichi Saito
- College of Pharmaceutical Sciences, Ritsumeikan University
| | | | - Miki Takahashi
- College of Pharmaceutical Sciences, Ritsumeikan University
| | | | - Koichi Inoue
- College of Pharmaceutical Sciences, Ritsumeikan University
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Shinomiya K, Tokura K, Hashimoto T, Watanabe R, Takeda T, Zaima K, Ito Y. Partition Efficiency of Eccentric Coil for Countercurrent Chromatographic Separation of Proteins Using Small-scale Cross-axis Coil Planet Centrifuge with Circular and Elliptic Cylindrical Columns. ANAL SCI 2021; 37:359-365. [PMID: 33100306 DOI: 10.2116/analsci.20p292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The partition efficiency of the double-spaced coil for eccentric and toroidal coils on countercurrent chromatographic separation of proteins was evaluated using the small-scale cross-axis coil planet centrifuge (CPC) equipped with circular and elliptic cylindrical columns. Standard cytochrome c, myoglobin and lysozyme samples were used for separation with the 12.5% (w/w) polyethylene glycol 1000 and 12.5% (w/w) dibasic potassium phosphate system. In the circular column, the double-spaced eccentric coil yielded better peak resolution than the double-spaced toroidal coil, and the double-spaced eccentric coil yielded better peak resolution than the single-spaced eccentric coil. In the elliptic column, the double-spaced eccentric coil also produced better peak resolution than the double-spaced toroidal coil, but the single-spaced eccentric coil yielded better peak resolution than the double-spaced eccentric coil. The overall results indicated that the double-spaced eccentric coil for the circular column and the single-spaced eccentric coil for the elliptic column yielded better protein separation using the small-scale cross-axis CPC with aqueous two-phase solvent systems.
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Affiliation(s)
| | - Koji Tokura
- College of Science and Technology, Nihon University
| | | | | | | | | | - Yoichiro Ito
- Laboratory of Bioseparation Technology, Biochemistry and Biophysics Center, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health
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Affiliation(s)
- Koichi INOUE
- Laboratory of Clinical and Analytical Chemistry, College of Pharmaceutical Sciences, Ritsumeikan University
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