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Adepiti AO, Nyamboki DK, Kibrom GB, Elujoba AA, Spiteller M, Matasyoh JC. Secondary metabolites from the stem bark of Alstonia boonei and the seeds of Picralima nitida with antibacterial activities. Nat Prod Res 2024:1-6. [PMID: 38684042 DOI: 10.1080/14786419.2024.2349254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 04/25/2024] [Indexed: 05/02/2024]
Abstract
The methanol stem bark extract of A. boonei and methanol seed extract of P. nitida, were subjected to purification using chromatographic techniques. A. boonei yielded loganic acid (1), sweroside (2) and secoxyloganin (3), while P. nitida afforded (1), akuammidine (4), akuammicine (5) and alstonine (6). The structures of the compounds were elucidated based on their nuclear magnetic resonance (NMR), high-resolution mass spectrometry (HRMS) profiles and comparison with literature data. The antibacterial activities of the compounds were evaluated using the disc diffusion assay with chloramphenicol as the positive control. Alstonine (6) demonstrated weak activity against Pseudomonas aeruginosa and Streptococcus agalactiae with zones of inhibition of 9.3 ± 0.6 and 10.0 ± 0.0 mm, respectively. This is the first report of sweroside (2) and secoxyloganin (3) in A. boonei.
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Affiliation(s)
- Awodayo Oluwatoyin Adepiti
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Dortmund, Germany
- Department of Pharmacognosy, Faculty of Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Divinah Kwamboka Nyamboki
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Dortmund, Germany
- Department of Chemistry, Faculty of Sciences, Egerton University, Egerton, Kenya
| | | | - Anthony Adebolu Elujoba
- Department of Pharmacognosy, Faculty of Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Dortmund, Germany
| | - Josphat Clement Matasyoh
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Dortmund, Germany
- Department of Chemistry, Faculty of Sciences, Egerton University, Egerton, Kenya
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2
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Ivanova B, Spiteller M. Stochastic dynamic ultraviolet photofragmentation and high collision energy dissociation mass spectrometric kinetics of triadimenol and sucralose. Environ Sci Pollut Res Int 2023; 30:32348-32370. [PMID: 36462070 DOI: 10.1007/s11356-022-24259-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 11/13/2022] [Indexed: 06/17/2023]
Abstract
The major goal of the paper is to provide empirical proof of view that innovative stochastic dynamic mass spectrometric equation D″SD = 2.6388·10-17·(< I2 > - < I > 2) determines the exact analyte concentration in solution via quantifying experimental variable intensity (I) of an analyte ion per any short span of scan time of any measurement, which also appears applicable to quantify laser-induced ultraviolet photofragmentation and high energy collision dissociation mass spectrometric processes. Triadimenol (1) and sucralose (2) using positive and negative polarity are examined. Laser irradiation energy λex = 213 nm is utilized. The issue is of central importance for monitoring organic micro-pollutants in surface, ground, and drinking water as well as tasks of risk assessment for environment and human health from contamination with organics. Despite the significant importance of the topic, answering the question of functional kinetic relations of such processes is by no means straightforward, so far, due to a lack of in-depth knowledge of mechanistic aspects of fragment paths of analytes in environment and foods as well as kinetics of processes under ultraviolet laser irradiation. Although there is truth in the classical theory of first-order reaction kinetics, it does not describe all kinetic data on analytes (1) and (2). A new damped sine wave functional response to a large amount of kinetics is presented. High-resolution mass spectrometric data and chemometrics are used. The study provides empirical evidence for claim that temporal behavior of mass spectrometric variable intensity under negative polarity obeys a certain scientific law written by means of equation above. It is the same for positive and negative soft-ionization mass spectrometric conditions.
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Affiliation(s)
- Bojidarka Ivanova
- Lehrstuhl Für Analytische Chemie, Institut Für Umweltforschung, Fakultät Für Chemie Und Chemische Biologie, Universität Dortmund, Otto-Hahn-Straße 6, 44221, Dortmund, Nordrhein-Westfalen, Germany.
| | - Michael Spiteller
- Lehrstuhl Für Analytische Chemie, Institut Für Umweltforschung, Fakultät Für Chemie Und Chemische Biologie, Universität Dortmund, Otto-Hahn-Straße 6, 44221, Dortmund, Nordrhein-Westfalen, Germany
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3
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Faloye KO, Adesida SA, Oguntimehin SA, Adewole AH, Omoyeni OB, Fajobi SJ, Ugwo JP, Asiyanbola ID, Bamimore VO, Fakola EG, Oladiran OJ, Spiteller M. LC-MS Analysis, Computational Investigation, and Antimalarial Studies of Azadirachta indica Fruit. Bioinform Biol Insights 2023; 17:11779322231154966. [PMID: 36860650 PMCID: PMC9969453 DOI: 10.1177/11779322231154966] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 01/17/2023] [Indexed: 03/03/2023] Open
Abstract
Malaria is a deadly disease that continues to pose a threat to children and maternal well-being. This study was designed to identify the chemical constituents in the ethanolic fruit extract of Azadirachta indica, elucidate the pharmacological potentials of identified phytochemicals through the density functional theory method and carry out the antimalarial activity of extract using chemosuppression and curative models. The liquid chromatography-mass spectrometry (LC-MS) analysis of the ethanolic extract was carried out, followed by the density functional theory studies of the identified phytochemicals using B3LYP and 6-31G (d, p) basis set. The antimalarial assays were performed using the chemosuppression (4 days) and curative models. The LC-MS fingerprint of the extract led to the identification of desacetylnimbinolide, nimbidiol, O-methylazadironolide, nimbidic acid, and desfurano-6α-hydroxyazadiradione. Also, the frontier molecular orbital properties, molecular electrostatic potential, and dipole moment studies revealed the identified phytochemicals as possible antimalarial agents. The ethanolic extract of A indica fruit gave 83% suppression at 800 mg/kg, while 84% parasitaemia clearance was obtained in the curative study. The study provided information about the phytochemicals and background pharmacological evidences of the antimalarial ethnomedicinal claim of A indica fruit. Thus, isolation and structure elucidation of the identified phytochemicals from the active ethanolic extract and extensive antimalarial studies towards the discovery of new therapeutic agents is recommended for further studies.
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Affiliation(s)
- Kolade O Faloye
- Department of Chemistry, Faculty of
Science, Obafemi Awolowo University, Ile-Ife, Nigeria,Kolade O Faloye, Department of Chemistry,
Faculty of Science, Obafemi Awolowo University, Ile-Ife, Nigeria.
| | - Stephen A Adesida
- Department of Pharmacognosy, Faculty of
Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Samuel A Oguntimehin
- Department of Pharmacognosy, Faculty of
Pharmacy, University of Ibadan, Ibadan, Nigeria
| | - Adetola H Adewole
- Department of Chemistry, University of
Pretoria, Pretoria, South Africa
| | - Olajide B Omoyeni
- Department of Chemistry, Faculty of
Science, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Sunday J Fajobi
- Department of Pharmacology, Faculty of
Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Jeremiah P Ugwo
- Department of Chemistry, School of
Science, Federal College of Education, Okene, Nigeria
| | - Isaac D Asiyanbola
- Department of Chemistry, School of
Science, Federal College of Education, Okene, Nigeria
| | - Victoria O Bamimore
- Department of Botany, Faculty of
Science, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Emmanuel G Fakola
- Department of Chemistry, Faculty of
Science, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Olayemi J Oladiran
- Department of Pharmacognosy, Faculty of
Pharmacy, Obafemi Awolowo University, Ile-Ife, Nigeria
| | - Michael Spiteller
- Institute of Environmental Research
(INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Dortmund,
Germany
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Nyamboki DK, Bedane KG, Hassan K, Spiteller M, Matasyoh JC. Cytotoxic compounds from the leaf of Bersama abyssinica subspecies abyssinica. Phytochemistry 2022; 198:113153. [PMID: 35240134 DOI: 10.1016/j.phytochem.2022.113153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 02/23/2022] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
From the leaves of Kenyan medicinal plant Bersama abyssinica Subspecies abyssinica, four previously undescribed compounds namely, three bufadienolides, 10β-formylpaulliniogenin B, 10β-formylpaulliniogenin A and 1β-acetoxy-3β,5β-dihydroxy-15-methoxy-16,19-dioxobufa-14(15),20,22-trienolide, and a phenolic compound 2,6,4'-trihydroxybenzophenone-4-O-(6‴-cinnamoyl)-β-D-glucoside were isolated together with four known compounds. The structural elucidation of the compounds was based on 1D and 2D NMR spectroscopy and HRMS data analyses. The relative configurations were defined by NOESY correlations. Cytotoxic activities on L929 and KB3.1 cell lines of the isolated compounds were investigated using MTT assay. The 1β-acetoxy-3β,5β-dihydroxy-15-methoxy-16,19-dioxobufa-14(15),20,22-trienolide showed significant cytotoxic activity against KB3.1 cell lines with IC50 of 3.9 ± 0.99 μM.
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Affiliation(s)
- Divinah Kwamboka Nyamboki
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany; Department of Chemistry, Faculty of Sciences, Egerton University, P.O. Box 536, 20115, Egerton, Kenya
| | - Kibrom Gebreheiwot Bedane
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany; Department of Chemistry, Addis Ababa University, P.O. Box 33658, Addis Ababa, Ethiopia
| | - Khadija Hassan
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, 38124, Braunschweig, Germany; German Centre for Infection Research (DZIF), Partner Site Hannover-Braunschweig, 38124, Braunschweig, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany
| | - Josphat Clement Matasyoh
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227, Dortmund, Germany; Department of Chemistry, Faculty of Sciences, Egerton University, P.O. Box 536, 20115, Egerton, Kenya.
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5
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Ivanova B, Spiteller M. Mass spectrometric stochastic dynamic 3D structural analysis of mixture of steroids in solution - Experimental and theoretical study. Steroids 2022; 181:109001. [PMID: 35257712 DOI: 10.1016/j.steroids.2022.109001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 02/23/2022] [Accepted: 02/28/2022] [Indexed: 12/16/2022]
Abstract
There is explored, herein, functional relation: Experimental mass spectrometric phenomenon, obeying a certain scientific law ⇔ 3D molecular conformations and electronic structures of analytes obtained for quantum chemical theories. The paper answers to questions: (a) What evidence claims these actual relations among measurable and theoretical parameters, experimental factors and molecular properties; (b) how the provided evidence is collected and used; and (c) how empirical proof relates to assign and explain mass spectrometric phenomena of steroids afforded by our innovative stochastic dynamic mass spectrometric formula, D″SD = 2.6388.10-17.(<I2>-<I>2), quantum chemical 3D conformations, electronic structures and energetics of molecules, respectively. The paper address issue concerning empirical evidence at very high-to-exact level of assignment of 3D molecular conformations of steroids to experimental mass spectrometric fragment ions, accounting precisely for (i) effect of protonation; (ii) intramolecular rearrangement for A-D rings of steroidal skeleton and proton transfer effect, if any; in addition to (iii) examination of enantiomers of steroids in mixture with different stereochemistry, (R) and (S), of a set of six atoms of the molecular backbone of hydrocortisone (1), deoxycorticosterone (2), progesterone (3) and methyltestosterone (4), respectively. Results from testosterone (5) are discussed, as well. There are used ultra-high resolution atmospheric pressure chemical ionization mass spectrometric data on analytes (1)-(4) at ng.(mL)-1 concentration levels in mixtures in solution obtained for positive operation mode. High accuracy static and molecular dynamic quantum chemical computations and chemometrics are also utilized. Experimental 3D structural parameters of steroids obtained for stochastic dynamic diffusion theory are correlated with available crystallographic data.
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Affiliation(s)
- Bojidarka Ivanova
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie und Chemische Biologie, Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Nordrhein-Westfalen, Germany.
| | - Michael Spiteller
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie und Chemische Biologie, Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Nordrhein-Westfalen, Germany
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6
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Ayoolu OS, Ogbole OO, Ajaiyeoba EO, Nchiozem-Ngnitedem VA, Demissie TB, Elbadawi M, Efferth T, Bedane KG, Spiteller M. Flavanols from Tetrapleura tetraptera with cytotoxic activities. Fitoterapia 2022; 160:105206. [DOI: 10.1016/j.fitote.2022.105206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 05/04/2022] [Accepted: 05/04/2022] [Indexed: 11/04/2022]
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Pitakbut T, Spiteller M, Kayser O. Genome Mining and Gene Expression Reveal Maytansine Biosynthetic Genes from Endophytic Communities Living inside Gymnosporia heterophylla (Eckl. and Zeyh.) Loes. and the Relationship with the Plant Biosynthetic Gene, Friedelin Synthase. Plants (Basel) 2022; 11:321. [PMID: 35161302 PMCID: PMC8840412 DOI: 10.3390/plants11030321] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/09/2022] [Accepted: 01/22/2022] [Indexed: 06/14/2023]
Abstract
Even though maytansine was first discovered from Celastraceae plants, it was later proven to be an endophytic bacterial metabolite. However, a pure bacterial culture cannot synthesize maytansine. Therefore, an exclusive interaction between plant and endophytes is required for maytansine production. Unfortunately, our understanding of plant-endophyte interaction is minimal, and critical questions remain. For example: how do endophytes synthesize maytansine inside their plant host, and what is the impact of maytansine production in plant secondary metabolites? Our study aimed to address these questions. We selected Gymnosporia heterophylla as our model and used amino-hydroxybenzoic acid (AHBA) synthase and halogenase genes as biomarkers, as these two genes respond to biosynthesize maytansine. As a result, we found a consortium of seven endophytes involved in maytansine production in G. heterophylla, based on genome mining and gene expression experiments. Subsequently, we evaluated the friedelin synthase (FRS) gene's expression level in response to biosynthesized 20-hydroxymaytenin in the plant. We found that the FRS expression level was elevated and linked with the expression of the maytansine biosynthetic genes. Thus, we achieved our goals and provided new evidence on endophyte-endophyte and plant-endophyte interactions, focusing on maytansine production and its impact on plant metabolite biosynthesis in G. heterophylla.
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Affiliation(s)
- Thanet Pitakbut
- Technical Biochemistry, Department of Biochemical and Chemical Engineering, TU Dortmund University, 44227 Dortmund, Germany;
| | - Michael Spiteller
- Department of Chemistry and Chemical Biology, Institute of Environmental Research (INFU), TU Dortmund University, 44227 Dortmund, Germany;
| | - Oliver Kayser
- Technical Biochemistry, Department of Biochemical and Chemical Engineering, TU Dortmund University, 44227 Dortmund, Germany;
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8
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Ivanova B, Spiteller M. Crystallographic and theoretical study of the atypical distorted octahedral geometry of the metal chromophore of zinc(II) bis((1R,2R)-1,2-diaminocyclohexane) dinitrate. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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Ivanova B, Spiteller M. Electrospray ionization stochastic dynamic mass spectrometric 3D structural analysis of Zn II–ion containing complexes in solution. INORG NANO-MET CHEM 2021. [DOI: 10.1080/24701556.2021.1956963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Bojidarka Ivanova
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie und Chemische Biologie, Universität Dortmund, Dortmund, Nordrhein-Westfalen, Deutschland
| | - Michael Spiteller
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie und Chemische Biologie, Universität Dortmund, Dortmund, Nordrhein-Westfalen, Deutschland
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10
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Pitakbut T, Spiteller M, Kayser O. In Vitro Production and Exudation of 20-Hydroxymaytenin from Gymnosporia heterophylla (Eckl. and Zeyh.) Loes. Cell Culture. Plants (Basel) 2021; 10:1493. [PMID: 34451538 PMCID: PMC8398937 DOI: 10.3390/plants10081493] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 07/09/2021] [Accepted: 07/10/2021] [Indexed: 12/27/2022]
Abstract
The metabolite 20-Hydroxymaytenin (20-HM) is a member of the quinone-methide pentacyclic triterpenoids (QMTs) group. This metabolite group is present only in Celastraceae plants, and it has shown various biological activities from antioxidant to anticancer properties. However, most QMTs metabolites including 20-HM cannot be synthesized in a laboratory. Therefore, we optimized a plant tissue culture protocol and examined the potential of Gymnosporia heterophylla (synonym. Maytenus heterophylla) to produce 20-HM in an in vitro experiment. For the first time, we reported the optimum callus induction medium with a high percentage success rate of 82% from the combination of 1 mg/L indole-3-butyric acid and 5 mg/L naphthalene acetic acid. Later, our cell suspension culture cultivated in the optimum medium provided approximately 0.35 mg/g fresh weight of 20-HM. This concentration is roughly 87.5 times higher than a concentration of 20-HM presenting in Elaeodendron croceum (Celastraceae) leaves. In addition, we also found that 20-HM presented in a cultivation medium, suggesting that G. heterophylla cells secreted 20-HM as an exudate in our experiment. Noticeably, 20-HM was missing when Penicillium cf. olsonii occurred in the medium. These findings hint at an antifungal property of 20-HM.
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Affiliation(s)
- Thanet Pitakbut
- Technical Biochemistry, Department of Biochemical and Chemical Engineering, TU Dortmund University, 44227 Dortmund, Germany;
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund University, 44227 Dortmund, Germany;
| | - Oliver Kayser
- Technical Biochemistry, Department of Biochemical and Chemical Engineering, TU Dortmund University, 44227 Dortmund, Germany;
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Nyamboki DK, Bedane KG, Hassan K, Brieger L, Strohmann C, Spiteller M, Matasyoh JC. Cytotoxic Compounds from the Stem Bark of Two subsp. of Bersama abyssinica. J Nat Prod 2021; 84:1453-1458. [PMID: 33974421 DOI: 10.1021/acs.jnatprod.0c01141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Three new bufadienolides, namely, paulliniogenin A (1), paulliniogenin B (2), and 16β-formyloxybersamagenin 1,3,5-orthoacetate (3), together with two known bufadienolides and six known phenolic substances, were isolated from the stem bark of Bersama abyssinica subsp. abyssinica and B. abyssinica subsp. paullinioides. The structures of the compounds were elucidated based on their NMR and HRMS data analyses. The relative configurations were defined by single-crystal X-ray crystallography and NOESY correlations. Cytotoxicity against the L929 and KB3.1 cancer cell lines of the isolated compounds was investigated using an MTT assay. Paulliniogenin A (1) and 16β-hydroxybersamagenin-1,3,5-orthoacetate (4) showed cytotoxicity against the KB3.1 cell line with IC50 values of 1.4 ± 0.77 and 1.6 ± 0.81 μM, respectively. Moreover, paulliniogenin A (1) and paulliniogenin B (2) demonstrated weak activity against Staphylococcus aureus.
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Affiliation(s)
- Divinah K Nyamboki
- Department of Chemistry, Faculty of Sciences, Egerton University, P.O. Box 536, 20115 Egerton, Kenya
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Kibrom G Bedane
- Department of Chemistry, Addis Ababa University, P.O. Box 33658, 1230 Addis Ababa, Ethiopia
| | - Khadija Hassan
- Department of Microbial Drugs, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany
| | - Lukas Brieger
- Inorganic Chemistry, Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Carsten Strohmann
- Inorganic Chemistry, Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Josphat C Matasyoh
- Department of Chemistry, Faculty of Sciences, Egerton University, P.O. Box 536, 20115 Egerton, Kenya
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12
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Omosa LK, Nchiozem-Ngnitedem VA, Mukavi J, Atieno Okoko B, Ombui Nyaboke H, Hashim I, Obegi Matundura J, Efferth T, Spiteller M. Cytotoxic alkaloids from the root of Zanthoxylum paracanthum (mildbr) Kokwaro. Nat Prod Res 2021; 36:2518-2525. [PMID: 33969756 DOI: 10.1080/14786419.2021.1913586] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Chemical investigation of the root of Zanthoxylum paracanthum afforded 1 new alkamide derivative, (2E,4E)-6-oxo-N-isobutyldeca-2,4-dienamide (1) together with 10 known congeners including one phenolic amide (2), four benzophenanthridines (3 - 6), three indolonaphthyridines (7 - 9) and two lignans (10 and 11). Their structures were elucidated by a combination of spectroscopic and spectrometric data. Using resazurin reduction assay, the crude extract (10 µg/mL) and isolates (10 µM) were screened for their cytotoxic activities against the drug-sensitive (CCRF-CEM) leukemia cell line and its multidrug-resistant counterpart (CEM/ADR5000). Compounds 3, 4 and 6 showed cytotoxicity against CCRF-CEM with IC50 values of 2.00 ± 0.33, 2.31 ± 0.20 and 0.11 ± 0.04 µM, respectively. Only compound 6 exhibited strong cytotoxic activity against CEM/ADR5000 with an IC50 value of 2.34 ± 0.34 µM in comparison with the standard drug doxorubicin which showed IC50 values of 0.01 ± 0.14 (CCRF-CEM) and 26.78 ± 3.30 µM (CEM/ADR5000).
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Affiliation(s)
| | - Vaderament-A Nchiozem-Ngnitedem
- Department of Chemistry, University of Nairobi, Nairobi, Kenya.,Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | - Justus Mukavi
- School of Pure and Applied Sciences, University of Embu, Embu, Kenya
| | | | | | - Ibrahim Hashim
- Department of Chemistry, University of Nairobi, Nairobi, Kenya.,Department of Chemistry, Federal University Lafia, Nasarawa State, Nigeria
| | | | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Mainz, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
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Nchiozem-Ngnitedem VA, Omosa LK, Bedane KG, Derese S, Spiteller M. Inhibition of Proinflammatory Cytokine Release by Flavones and Flavanones from the Leaves of Dracaena steudneri Engl. Planta Med 2021; 87:209-217. [PMID: 33285592 DOI: 10.1055/a-1306-1368] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The leaves of Dracaena steudneri yielded 6 new flavonoids-3,5,7-trihydroxy-6-methyl-3',4'-methylenedioxyflavone (1: ), 5,7-dihydroxy-3-methoxy-6-methyl-3',4'-methylenedioxyflavone (2: ), 3,5,7-trihydroxy-6-methoxy-3',4'-methylenedioxyflavone (3: ), (2S,3S)-3,7-dihydroxy-6-methoxy-3',4'-methylenedioxyflavanone (4: ), 4',5,7-trihydroxy-3,3',8-trimethoxy-6-methylflavone (5: ), (2R) 7-hydroxy-2',8-dimethoxyflavanone (6: )-together with 13 known congeners. Their structures were established using spectroscopic and spectrometric methods including NMR, CD, and HRMSn measurements. The compounds were evaluated for their anti-inflammatory potential through measurement of the levels of cytokines IL-1β, IL-2, GM-CSF, and TNF-α in the supernatant of human peripheral blood mononuclear cells stimulated by lipopolysaccharide. Flavones derivatives 1: -4: with a C-3'/4' methylenedioxy substituent led to a substantial increase in the production of IL-1β and GM-CSF out of 4 pro-inflammatory cytokines relative to LPS control. Quercetin derivatives 5, 11,: and 13: with a hydroxyl group at C-4' inhibited the production of IL-2, GM-CSF, and TNF-α. The presence of a C-2/C-3 double bond in 14: was pivotal to the significantly stronger (0.4 to 27.5% of LPS control) inhibitory effect compared to its dihydro derivative 8: (36.2 to 262.7% of LPS control) against all tested cytokines. It is important to note that the inhibitory activity of 14: was substantially higher than that of the standard drug used, ibuprofen.
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Affiliation(s)
- Vaderament-A Nchiozem-Ngnitedem
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | | | | | - Solomon Derese
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
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14
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Abstract
This paper deals with quantification of the following steroids in mixture: hydrocortisone (1), deoxycorticosterone (2), progesterone (3) and methyltestosterone (4) by means of mass spectrometry and implementing our innovative stochatic dynamic functional relationship between the analyte concentration in solution and the experimental variable intensity. The mass spectrometric data are correlated independently using chromatography. Chemometric analysis is carried out.
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Affiliation(s)
- Bojidarka Ivanova
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie und Chemische Biologie, Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Nordrhein-Westfalen, Germany.
| | - Michael Spiteller
- Lehrstuhl für Analytische Chemie, Institut für Umweltforschung, Fakultät für Chemie und Chemische Biologie, Universität Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Nordrhein-Westfalen, Germany
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15
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Schneider KM, Elfers C, Ghallab A, Schneider CV, Galvez EJC, Mohs A, Gui W, Candels LS, Wirtz TH, Zuehlke S, Spiteller M, Myllys M, Roulet A, Ouzerdine A, Lelouvier B, Kilic K, Liao L, Nier A, Latz E, Bergheim I, Thaiss CA, Hengstler JG, Strowig T, Trautwein C. Intestinal Dysbiosis Amplifies Acetaminophen-Induced Acute Liver Injury. Cell Mol Gastroenterol Hepatol 2020; 11:909-933. [PMID: 33189892 PMCID: PMC7900526 DOI: 10.1016/j.jcmgh.2020.11.002] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 10/31/2020] [Accepted: 11/02/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Acute liver failure (ALF) represents an unmet medical need in Western countries. Although the link between intestinal dysbiosis and chronic liver disease is well-established, there is little evidence for a functional role of gut-liver interaction during ALF. Here we hypothesized that intestinal dysbiosis may affect ALF. METHODS To test this hypothesis, we assessed the association of proton pump inhibitor (PPI) or long-term antibiotics (ABx) intake, which have both been linked to intestinal dysbiosis, and occurrence of ALF in the 500,000 participants of the UK BioBank population-based cohort. For functional studies, male Nlrp6-/- mice were used as a dysbiotic mouse model and injected with a sublethal dose of acetaminophen (APAP) or lipopolysaccharide (LPS) to induce ALF. RESULTS Multivariate Cox regression analyses revealed a significantly increased risk (odds ratio, 2.3-3) for developing ALF in UK BioBank participants with PPI or ABx. Similarly, dysbiotic Nlrp6-/- mice displayed exacerbated APAP- and LPS-induced liver injury, which was linked to significantly reduced gut and liver tissue microbiota diversity and correlated with increased intestinal permeability at baseline. Fecal microbiota transfer (FMT) from Nlrp6-/- mice into wild-type (WT) mice augmented liver injury on APAP treatment in recipient WT mice, resembling the inflammatory phenotype of Nlrp6-/- mice. Specifically, FMT skewed monocyte polarization in WT mice toward a Ly6Chi inflammatory phenotype, suggesting a critical function of these cells as sensors of gut-derived signals orchestrating the inflammatory response. CONCLUSIONS Our data show an important yet unknown function of intestinal microbiota during ALF. Intestinal dysbiosis was transferrable to healthy WT mice via FMT and aggravated liver injury. Our study highlights intestinal microbiota as a targetable risk factor for ALF.
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Affiliation(s)
- Kai Markus Schneider
- Department of Medicine III, University Hospital RWTH Aachen, Aachen, Germany; Department of Microbiology; Institute for Immunology; and Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Carsten Elfers
- Department of Medicine III, University Hospital RWTH Aachen, Aachen, Germany
| | - Ahmed Ghallab
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University Dortmund, Dortmund, Germany; Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt
| | | | - Eric J C Galvez
- Helmholtz Centre for Infection Research, Braunschweig, Germany; and Hannover Medical School, Hannover, Germany
| | - Antje Mohs
- Department of Medicine III, University Hospital RWTH Aachen, Aachen, Germany
| | - Wenfang Gui
- Department of Medicine III, University Hospital RWTH Aachen, Aachen, Germany
| | | | | | - Sebastian Zuehlke
- Department of Chemistry and Chemical Biology, Institute of Experimental Research (INFU), TU Dortmund University, Dortmund, Germany
| | - Michael Spiteller
- Department of Chemistry and Chemical Biology, Institute of Experimental Research (INFU), TU Dortmund University, Dortmund, Germany
| | - Maiju Myllys
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University Dortmund, Dortmund, Germany
| | | | | | | | - Konrad Kilic
- Department of Medicine III, University Hospital RWTH Aachen, Aachen, Germany
| | - Lijun Liao
- Department of Medicine III, University Hospital RWTH Aachen, Aachen, Germany; Department of Anesthesiology and Pain Management, Shanghai East Hospital, Tongji University, Shanghai, China
| | - Anika Nier
- Department of Nutritional Sciences, R.F. Molecular Nutritional Science, University of Vienna, Vienna, Austria
| | - Eicke Latz
- Institute for Innate Immunity, University of Bonn, Bonn, Germany
| | - Ina Bergheim
- Department of Nutritional Sciences, R.F. Molecular Nutritional Science, University of Vienna, Vienna, Austria
| | - Christoph A Thaiss
- Department of Microbiology; Institute for Immunology; and Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Jan G Hengstler
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University Dortmund, Dortmund, Germany
| | - Till Strowig
- Helmholtz Centre for Infection Research, Braunschweig, Germany; and Hannover Medical School, Hannover, Germany
| | - Christian Trautwein
- Department of Medicine III, University Hospital RWTH Aachen, Aachen, Germany.
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Daoud F, Zuehlke S, Spiteller M, Kayser O. Corrigendum to "Ozonation of rivaroxaban production waste water and comparison of generated transformation products with known in vivo and in vitro metabolites" [Sci. Total Environ. 714 (2020), 136825]. Sci Total Environ 2020; 742:140865. [PMID: 32703553 DOI: 10.1016/j.scitotenv.2020.140865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Affiliation(s)
- Fares Daoud
- Bayer AG, Friedrich-Ebert-Str. 217-333, 42096 Wuppertal, Germany.
| | - Sebastian Zuehlke
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Oliver Kayser
- Department of Technical Biochemistry, Technical University of Dortmund, Emil-Figge-Str. 66, 44227 Dortmund, Germany
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17
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Mukavi J, Omosa LK, Nchiozem-Ngnitedem VA, Nyaga J, Omole R, Bitchagno GTM, Spiteller M. Anti-inflammatory norhopanes from the root bark of Fagaropsis angolensis (Engl.) H.M.Gardner. Fitoterapia 2020; 146:104690. [DOI: 10.1016/j.fitote.2020.104690] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 06/17/2020] [Accepted: 07/14/2020] [Indexed: 12/31/2022]
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Nchiozem-Ngnitedem VA, Omosa LK, Bedane KG, Derese S, Brieger L, Strohmann C, Spiteller M. Anti-inflammatory steroidal sapogenins and a conjugated chalcone-stilbene from Dracaena usambarensis Engl. Fitoterapia 2020; 146:104717. [DOI: 10.1016/j.fitote.2020.104717] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 08/26/2020] [Accepted: 08/27/2020] [Indexed: 11/24/2022]
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Owor RO, Derese S, Bedane KG, Zühlke S, Ndakala A, Spiteller M. Isoflavones from the seedpods of Tephrosia vogelii and pyrazoisopongaflavone with anti-inflammatory effects. Fitoterapia 2020; 146:104695. [PMID: 32750400 DOI: 10.1016/j.fitote.2020.104695] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/23/2020] [Accepted: 07/28/2020] [Indexed: 11/25/2022]
Abstract
Phytochemical investigation of Tephrosia vogelii seedpods led to the isolation of twelve compounds: vogelisoflavone A (1), vogelisoflavone B (2), isopongaflavone (3), onogenin, luteolin, 4',7-dihydroxy-3'-methoxyflavanone, trans-p-hydroxycinnamic acid, tephrosin, 2-methoxygliricidol, dehydrorotenone, 6a,12a-dehydro-α-toxicarol and pinoresinol. Compounds 1 and 2 are reported as new natural products. Isopongaflavone (3) was structurally modified using hydrazine to pyrazoisopongaflavone (4). These compounds were characterized based on their NMR and HRESIMS data. Further, four compounds (1-4) were evaluated for their anti-inflammatory effects in lipopolysaccharide (LPS)-stimulated peripheral blood mononuclear cells (PBMCs). Treatment of the LPS-stimulated PBMCs with the compounds at a concentration of 100 μM suppressed the secretion of interleukin IL-1β interferon-gamma (IFN-γ), granulocyte macrophage-colony stimulating factor (GM-CSF) and tumour necrosis factor-alpha (TNF-α).
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Affiliation(s)
- Richard Oriko Owor
- Department of Chemistry, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya; Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, 44221 Dortmund, Germany; Department of Chemistry, Busitema University, P.O. Box 236, Tororo, Uganda.
| | - Solomon Derese
- Department of Chemistry, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya
| | | | - Sebastian Zühlke
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, 44221 Dortmund, Germany
| | - Albert Ndakala
- Department of Chemistry, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya.
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, 44221 Dortmund, Germany.
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Bedane KG, Brieger L, Strohmann C, Seo EJ, Efferth T, Spiteller M. Cytotoxic bufadienolides from the leaves of a medicinal plant Melianthus comosus collected in South Africa. Bioorg Chem 2020; 102:104102. [PMID: 32721779 DOI: 10.1016/j.bioorg.2020.104102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 05/24/2020] [Accepted: 07/12/2020] [Indexed: 10/23/2022]
Abstract
From the leaves of South African medicinal plant Melianthus comosus, four previously undescribed bufadienolides, 16β-formyloxymelianthugenin (1), 2β-acetoxymelianthusigenin (2), 2β-hydroxy-3β,5β-di-O-acetylhellebrigenin (3), and 2β-acetoxy-5β-O-acetylhellebrigenin (4) were isolated together with two known bufadienolides. The structural elucidation of the compounds was based on 1D and 2D NMR spectroscopy, high-resolution mass spectrometry, and other spectroscopic methods. The relative configurations were determined by single-crystal X-ray crystallography analysis and NOESY correlations. The isolated compounds displayed strong cytotoxicity against MCF-7 breast cancer cells, sensitive CCRF-CEM and multidrug-resistant CEM/ADR5000 leukemia cells. Compound 1 showed the most potent activity, with IC50 values of 0.07 μM towards CCRF-CEM, 0.06 μM towards CEM/ADR5000 and 0.36 μM towards MCF-7 followed by compound 4 with IC50 values of 0.13 μM towards CCRF-CEM, 0.08 μM towards CEM/ADR5000 and 0.53 μM towards MCF-7.
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Affiliation(s)
- Kibrom Gebreheiwot Bedane
- Department of Chemistry, Addis Ababa University, P.O. Box 33658, Addis Ababa, Ethiopia; Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany.
| | - Lukas Brieger
- Inorganic Chemistry, Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Carsten Strohmann
- Inorganic Chemistry, Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Ean-Jeong Seo
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany.
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21
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Abstract
Melianthus major is a medicinal plant endemic to South Africa. Its leaf extract led to the isolation of five new bufadienolides, 2β-acetoxy-3,5-di-O-acetylhellebrigenin (1), 2β-acetoxy-3-O-acetylhellebrigenin (2), 2β-acetoxy-14-deoxy-15β,16β-epoxymelianthugenin (4), 2β-acetoxy-14-deoxy-15β,16β-epoxymelianthusigenin (5), and 2β-hydroxymelianthusigenin (6), and four known analogues. The structures of the compounds were elucidated using NMR and HRESIMS data analyses. The relative configurations were defined by single-crystal X-ray crystallography and NOESY correlations. The isolated compounds exhibited strong cytotoxicity against MCF-7 breast cancer cells and sensitive CCRF-CEM and multidrug-resistant CEM/ADR5000 leukemia cells. Compound 1 showed the most potent activity, with IC50 values of 0.1 μM toward CCRF-CEM and CEM/ADR5000 and 0.3 μM toward MCF-7.
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Affiliation(s)
| | | | | | - Ean-Jeong Seo
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmacy and Biomedical Sciences, Johannes Gutenberg University, Staudinger Weg 5, 55128 Mainz, Germany
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22
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Kyekyeku JO, Asare-Nkansah S, Bekoe SO, Sezgin S, Adosraku RK, Spiteller M. MALDI-HRMS imaging and HPLC-HRESI-MS n characterisation of kaurane diterpenes in the fruits of Xylopia aethiopica (Dunal) A. Rich (Annonaceae). Phytochem Anal 2020; 31:349-354. [PMID: 31875345 DOI: 10.1002/pca.2901] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 10/21/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
INTRODUCTION Kaurane diterpenes, notably xylopic acid, have demonstrated important biological activities including analgesia, anti-oxidant, antimicrobial and cytotoxicity. The fruits of Xylopia aethiopica have been reported to be a rich source of kaurane diterpenes. OBJECTIVE An analytical approach for detailed imaging and characterisation of selected kaurane diterpenes was developed using matrix-assisted laser desorption/ionisation high-resolution mass spectrometry (MALDI-HRMS) imaging techniques and high-performance liquid chromatography-high resolution electrospray ionisation-tandem mass spectrometry (HPLC-HRESI-MSn ) studies, respectively. METHODS The images of the compounds were constructed based on selected ions from their HRESI-MS spectra. The matrix employed comprised a solution of α-cyano-4-hydroxycinnamic acid (HCCA) in acetonitrile-water with trifluoroacetic acid (TFA). HPLC-HRESI-MSn measurements were conducted on an LTQ-Orbitrap spectrometer equipped with a heated electrospray ionisation (HESI)-II source. RESULTS The analytical strategy adopted showed the spatial distribution of the compounds in the fruits of X. aethiopica based on the dominant ions at m/z 301.2163 [M + H - HOCOCH3 ]+ and m/z 399.1932 [M + K]+ for xylopic acid, m/z 317.2111 [M + H]+ and m/z 355.1670 [M + K]+ for 15-oxo-ent-kaur-16-en-19-oic acid and m/z 303.2319 [M + H]+ for ent-kaur-16-en-19-oic acid. The fragmentation patterns of the compounds were proposed based on the HRESI-MSn measurements. CONCLUSIONS The study revealed the spatial variability, differential behaviours and specificity of the selected kaurane diterpenes in the fruit, seed and pericarp. The compounds under study were predominantly restricted to the pericarp of the fruit with trace amounts in the seed.
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Affiliation(s)
- James Oppong Kyekyeku
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Pharmaceutical Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Samuel Asare-Nkansah
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Pharmaceutical Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Samuel Oppong Bekoe
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Pharmaceutical Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Selahaddin Sezgin
- Chair of Environmental Chemistry and Analytical Chemistry, Department of Chemistry and Chemical Biology, Institute of Environmental Research (INFU), Dortmund, Germany
| | - Reimmel Kwame Adosraku
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy and Pharmaceutical Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
| | - Michael Spiteller
- Chair of Environmental Chemistry and Analytical Chemistry, Department of Chemistry and Chemical Biology, Institute of Environmental Research (INFU), Dortmund, Germany
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Owor RO, Bedane KG, Zühlke S, Derese S, Ong'amo GO, Ndakala A, Spiteller M. Anti-inflammatory Flavanones and Flavones from Tephrosia linearis. J Nat Prod 2020; 83:996-1004. [PMID: 32155073 DOI: 10.1021/acs.jnatprod.9b00922] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Phytochemical analysis of a methanol-dichloromethane (1:1) extract of the aerial parts of Tephrosialinearis led to the isolation of 18 compounds. Seven of these, namely, lineaflavones A-D (1-4), 6-methoxygeraldone (5), 8″-acetylobovatin (6), and 5-hydroxy-7-methoxysaniculamin A (7) are new compounds. The compounds were characterized based on their NMR and HRMSn data. The anti-inflammatory effects of the crude extract and isolated compounds were evaluated by measuring the levels of interleukins (IL-1β, IL-2, and IL-6), granulocyte-macrophage colony-stimulating factor (GM-CSF), and tumor necrosis factor-α (TNF-α) in lipopolysaccharide (LPS)-stimulated peripheral blood mononuclear cells (PBMCs). The crude extract inhibited the release of all cytokines except IL-1β, which slightly increased in comparison to the LPS control. All the tested compounds suppressed the production of IL-2, GM-CSF, and TNF-α. Whereas compounds 1, 2, 4-8, 10-15, 17, and 18 decreased production of IL-6, compounds 1, 2, 4, 7, 10, 13-15, and 17 inhibited the release of IL-1β. It is worth noting that most of the compounds tested showed a superior reduction in cytokines release compared to the reference drug ibuprofen.
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Affiliation(s)
- Richard Oriko Owor
- Department of Chemistry, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
- Department of Chemistry, Busitema University, P.O. Box 236, Tororo, Uganda
| | - Kibrom Gebreheiwot Bedane
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | - Sebastian Zühlke
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | - Solomon Derese
- Department of Chemistry, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya
| | | | - Albert Ndakala
- Department of Chemistry, University of Nairobi, P.O. Box 30197-00100, Nairobi, Kenya
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
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Daoud F, Zuehlke S, Spiteller M, Kayser O. Ozonation of rivaroxaban production waste water and comparison of generated transformation products with known in vivo and in vitro metabolites. Sci Total Environ 2020; 714:136825. [PMID: 31991279 DOI: 10.1016/j.scitotenv.2020.136825] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 01/18/2020] [Accepted: 01/18/2020] [Indexed: 06/10/2023]
Abstract
During production of rivaroxaban, an orally administrated anticoagulant, process waste water is generated at several stages of manufacturing. Due to low biodegradability in conventional waste water treatment plants, it is currently incinerated. Thus, new pre-treatment methods for rivaroxaban-containing waste water could facilitate its subsequent biological processing. In this study, ozonation was investigated as the pre-treatment method, with special emphasis on the elimination of the target compound and the generation of its main transformation products. These were determined by high performance liquid chromatography - high resolution mass spectrometry (HPLC-HRMS). Our results show that the concentration of rivaroxaban in the ozonated waste water can be effectively reduced (below detection limit) under acidic conditions, whereas neutral or basic reaction environment proved less suitable. Four main transformation products were identified and their concentrations determined. Rivaroxaban and its most prominent transformation product acetoxamide were elucidated in multiple-stage mass spectrometry (MSn) experiments. Transformation products derived from the degradation of rivaroxaban were then compared to its natural (animal and human) metabolites as well as other known derivatives. In contrast to previously published rivaroxaban-derived metabolites, the presented ozonation experiments resulted in new transformation products.
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Affiliation(s)
- Fares Daoud
- Bayer AG, Friedrich-Ebert-Str. 217-333, 42096 Wuppertal, Germany.
| | - Sebastian Zuehlke
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Oliver Kayser
- Department of Technical Biochemistry, Technical University of Dortmund, Emil-Figge-Str. 66, 44227 Dortmund, Germany
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Owor RO, Bedane KG, Openda YI, Zühlke S, Derese S, Ong'amo G, Ndakala A, Spiteller M. Synergistic anti-inflammatory activities of a new flavone and other flavonoids from Tephrosia hildebrandtii vatke. Nat Prod Res 2020; 35:4486-4493. [PMID: 32233673 DOI: 10.1080/14786419.2020.1736065] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A new flavone, named hildeflavone (1) along with 7 other known flavonoids were isolated from the aerial parts of Tephrosia hildebrandtii Vatke. Their characterisation was based on NMR and MS data analysis. The anti-inflammatory properties of the crude extract, isolated compounds and combination of the compounds were investigated in lipopolysaccharide (LPS)-stimulated peripheral blood mononuclear cells (PBMCs). Treatment of the LPS-stimulated PBMCs with the isolated flavonoids at a concentration of 100 µM significantly reduced the production of interleukins (IL-1β, IL-2 and IL-6), interferon-gamma (IFN-γ), granulocyte macrophage-colony stimulating factor (GM-CSF) and tumour necrosis factor-alpha (TNF-α). It was also found that the combination of a flavone and flavanones exhibited remarkable synergistic anti-inflammatory effects on the production of the cytokines.
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Affiliation(s)
- Richard Oriko Owor
- Department of Chemistry, University of Nairobi, Nairobi, Kenya.,Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany.,Department of Chemistry, Busitema University, Tororo, Uganda
| | - Kibrom Gebreheiwot Bedane
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany.,Department of Chemistry, Addis Ababa University, Addis Ababa, Ethiopia
| | | | - Sebastian Zühlke
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | - Solomon Derese
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
| | - George Ong'amo
- School of Biological Sciences, University of Nairobi, Nairobi, Kenya
| | - Albert Ndakala
- Department of Chemistry, University of Nairobi, Nairobi, Kenya
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
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Ivanova B, Spiteller M. 3D structural analysis of isomers of benzaldehydes and benzoic acids and their base catalysed C–C coupled derivatives under electrospray ionization conditions – mass spectrometric stochastic dynamic and quantum chemical approaches. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Hartmann H, Burhenne J, Müller K, Frede HG, Spiteller M. Rapid Target Analysis for Pesticides in Water by Online Coated Capillary Microextraction Combined with Liquid Chromatography and Tandem Mass Spectrometry. J AOAC Int 2019. [DOI: 10.1093/jaoac/83.3.762] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
The applicability of online trace enrichment with custom-made coated capillaries combined with tandem mass spectrometry was demonstrated for the target analysis of selected pesticides (mainly herbicides, e.g., triazines, phenylureas, and acetanilides) in water. The developed method allows rapid determination of several widely used plant protectants within a total analysis time of 11 min. Good linearity (r ≥ 0.995) was obtained for the selected pesticides in the range of 0.050–50 μg/L. The relative standard deviations (RSDs) of the peak areas were ≤3.8% for spiked Milli-Q water (5 μg/L). The RSDs obtained in analyses of spiked (1 μg/L) water samples (brook water, river water, sewage plant effluent) ranged from 2.9 to 6.8%, indicating low influence of the matrix on enrichment and detection. The detection limits, which ranged from 10 to 90 ng/L, fulfilled the requirements of the European regulations for drinking water. The polyacrylate coating of the extraction capillary showed good stability in the presence of water and acetonitrile and allowed ≥100 extractions with 1 capillary.
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Affiliation(s)
- Holger Hartmann
- University of Kassel, Department of Ecological Chemistry and Ecotoxicology, Nordbahnhofstr. 1a, D-37213 Witzenhausen, Germany
| | - Jürgen Burhenne
- University of Kassel, Department of Ecological Chemistry and Ecotoxicology, Nordbahnhofstr. 1a, D-37213 Witzenhausen, Germany
| | - Karin Müller
- University of Giessen, Department of Agricultural Ecology and Natural Resources Management, Senckenbergstr. 3, D-35290 Giessen, Germany
| | - Hans G Frede
- University of Giessen, Department of Agricultural Ecology and Natural Resources Management, Senckenbergstr. 3, D-35290 Giessen, Germany
| | - Michael Spiteller
- University of Dortmund, Institute of Environmental Research, Otto-Hahn-Str. 6, D-44221 Dortmund, Germany
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Ivanova B, Spiteller M. Stochastic dynamic electrospray ionization mass spectrometric diffusion parameters and 3D structural determination of complexes of AgI–ion – Experimental and theoretical treatment. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.111307] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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29
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Ivanova B, Spiteller M. Noncentrosymmetric organic crystals of barbiturates as potential nonlinear optical phores: experimental and theoretical analyses. Chem Pap 2019. [DOI: 10.1007/s11696-019-00835-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Ivanova B, Spiteller M. Stochastic dynamic electrospray ionization mass spectrometric diffusion parameters and 3D structural analysis of coordination species of copper(II) ion with glycylhomopentapeptide and its dimeric associates. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.02.116] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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31
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Kubicki M, Lamshöft M, Lagojda A, Spiteller M. Metabolism and spatial distribution of metalaxyl in tomato plants grown under hydroponic conditions. Chemosphere 2019; 218:36-41. [PMID: 30469002 DOI: 10.1016/j.chemosphere.2018.11.069] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Revised: 11/05/2018] [Accepted: 11/10/2018] [Indexed: 06/09/2023]
Abstract
Knowledge about translocation of plant protection products (PPP's) in plants is important to understand the uptake via the root system. Here we report the combination of analysis of tissue extracts by LC-HRMSn, autoradiography of 14C-labeled compounds and MALDI-MSI, which combine qualitative and quantitative information of chemical composition and the spatial distribution of PPP's and their metabolites in situ. Therefore, the uptake of the phenylamide fungicide metalaxyl was studied in tomato plants (Solanum lycopersicum) using a hydroponic system. The plants have been cultivated in perlite until the two-leaf stage and were transferred into the hydroponic test system afterwards. The radioactive labeled fungicide was readily taken up by the roots during the normal water consumption and radioactivity was translocated uniformly to the aboveground part of the tomato plants, while only small proportion of the applied radioactivity were observed in the roots. The distribution of metalaxyl after the plant uptake experiment in the primary roots where analyzed by a transversal tissue section in the zone of maturation. Metalaxyl is mainly localized in root xylem and in cortex located at the epidermis. With LC-HRMSn and radiochemical analyses of stem and leaf, no parent compound was detectable. Four polar metabolites were the main identified components of the residue and could be visualized by MALDI-imaging mass spectrometry. With these results we could show, that the fungicide metalaxyl is taken up by the plant via the roots during the regular water consumption and transported to xylem.
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Affiliation(s)
- Michael Kubicki
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Germany
| | - Marc Lamshöft
- Bayer AG, Alfred-Nobel-Straße 50, 40789 Monheim am Rhein, Germany.
| | - Andreas Lagojda
- Bayer AG, Alfred-Nobel-Straße 50, 40789 Monheim am Rhein, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Germany.
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Ghallab A, Hofmann U, Sezgin S, Vartak N, Hassan R, Zaza A, Godoy P, Schneider KM, Guenther G, Ahmed YA, Abbas AA, Keitel V, Kuepfer L, Dooley S, Lammert F, Trautwein C, Spiteller M, Drasdo D, Hofmann AF, Jansen PL, Hengstler JG, Reif R. Bile Microinfarcts in Cholestasis Are Initiated by Rupture of the Apical Hepatocyte Membrane and Cause Shunting of Bile to Sinusoidal Blood. Hepatology 2019; 69:666-683. [PMID: 30102412 PMCID: PMC6587841 DOI: 10.1002/hep.30213] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2017] [Accepted: 07/02/2018] [Indexed: 12/31/2022]
Abstract
Bile duct ligation (BDL) is an experimental procedure that mimics obstructive cholestatic disease. One of the early consequences of BDL in rodents is the appearance of so-called bile infarcts that correspond to Charcot-Gombault necrosis in human cholestasis. The mechanisms causing bile infarcts and their pathophysiological relevance are unclear. Therefore, intravital two photon-based imaging of BDL mice was performed with fluorescent bile salts (BS) and non-BS organic anion analogues. Key findings were followed up by matrix-assisted laser desorption ionization imaging, clinical chemistry, immunostaining, and gene expression analyses. In the acute phase, 1-3 days after BDL, BS concentrations in bile increased and single-cell bile microinfarcts occurred in dispersed hepatocytes throughout the liver caused by the rupture of the apical hepatocyte membrane. This rupture occurred after loss of mitochondrial membrane potential, followed by entry of bile, cell death, and a "domino effect" of further death events of neighboring hepatocytes. Bile infarcts provided a trans-epithelial shunt between bile canaliculi and sinusoids by which bile constituents leaked into blood. In the chronic phase, ≥21 days after BDL, uptake of BS tracers at the sinusoidal hepatocyte membrane was reduced. This contributes to elevated concentrations of BS in blood and decreased concentrations in the biliary tract. Conclusion: Bile microinfarcts occur in the acute phase after BDL in a limited number of dispersed hepatocytes followed by larger infarcts involving neighboring hepatocytes, and they allow leakage of bile from the BS-overloaded biliary tract into blood, thereby protecting the liver from BS toxicity; in the chronic phase after BDL, reduced sinusoidal BS uptake is a dominant protective factor, and the kidney contributes to the elimination of BS until cholemic nephropathy sets in.
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Affiliation(s)
- Ahmed Ghallab
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary MedicineSouth Valley UniversityQenaEgypt
| | - Ute Hofmann
- Dr. Margarete Fischer‐Bosch Institute of Clinical Pharmacology and University of TübingenStuttgartGermany
| | - Selahaddin Sezgin
- Institute of Environmental Research, Department of Chemistry and Chemical BiologyTechnical University Dortmund UniversityDortmundGermany
| | - Nachiket Vartak
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
| | - Reham Hassan
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary MedicineSouth Valley UniversityQenaEgypt
| | - Ayham Zaza
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
- Institute National de Recherche en Informatique et en AutomatiqueLe ChesnayFrance
| | - Patricio Godoy
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
| | | | - Georgia Guenther
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
| | - Yasser A. Ahmed
- Department of Histology, Faculty of Veterinary MedicineSouth Valley UniversityQenaEgypt
| | - Aya A. Abbas
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary MedicineSouth Valley UniversityQenaEgypt
| | - Verena Keitel
- Clinic for Gastroenterology, Hepatology and Infectious DiseasesUniversity Hospital Düsseldorf, Medical Faculty at Heinrich‐Heine‐UniversityDüsseldorfGermany
| | | | - Steven Dooley
- Department of Medicine II, Medical Faculty MannheimHeidelberg UniversityMannheimGermany
| | - Frank Lammert
- Department of Medicine IISaarland University Medical Center, Saarland UniversityHomburgGermany
| | | | - Michael Spiteller
- Institute of Environmental Research, Department of Chemistry and Chemical BiologyTechnical University Dortmund UniversityDortmundGermany
| | - Dirk Drasdo
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
- Institute National de Recherche en Informatique et en AutomatiqueLe ChesnayFrance
| | - Alan F. Hofmann
- Department of MedicineUniversity of CaliforniaSan Diego, San DiegoCA
| | - Peter L.M. Jansen
- Maastricht Centre of Systems BiologyUniversity of MaastrichtMaastrichtThe Netherlands
| | - Jan G. Hengstler
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
| | - Raymond Reif
- Leibniz Research Centre for Working Environment and Human Factors at the Technical University DortmundDortmundGermany
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Ivanova B, Spiteller M. Experimental and theoretical mass spectrometric quantification of diffusion parameters and 3D structural determination of ions of L-tryptophyl-l-tryptophan in electrospray ionization conditions in positive operation mode. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.07.055] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Eckelmann D, Kusari S, Spiteller M. Stable Isotope Labeling of Prodiginines and Serratamolides Produced by Serratia marcescens Directly on Agar and Simultaneous Visualization by Matrix-Assisted Laser Desorption/Ionization Imaging High-Resolution Mass Spectrometry. Anal Chem 2018; 90:13167-13172. [PMID: 30379065 DOI: 10.1021/acs.analchem.8b03633] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Matrix-assisted laser desorption/ionization imaging high-resolution mass spectrometry (MALDI-imaging-HRMS) is an important technique for visualizing the spatial distribution of compounds directly on the surface of organisms such as microorganisms, insects, plants, animals, and human tissues. However, MALDI-imaging-HRMS and the stable isotope labeling approach have never been combined for the detection and simultaneous visualization of labeled and unlabeled compounds, their analogues and derivatives, as well as their precursors. Herein, we present a methodology that labels microbial secondary metabolites directly on agar with stable isotopes and allows concurrent spatial distribution analyses by MALDI-imaging-HRMS. Using a thin film of labeled agar supplemented with [1-13C]-l-proline, [methyl-D3]-l-methionine, 15NH4Cl, or [15N]-l-serine overlaid on unlabeled agar, we demonstrate the incorporation of labeled precursors into prodiginines and serratamolides produced by an endophytic bacterium, Serratia marcescens, by MALDI-imaging-HRMS and HPLC-HRMS. Further, we show the incorporation of CD3 into prodigiosin as well as its characteristic fragments directly by MALDI-imaging-HRMS2. Our methodology has several advantages over currently existing techniques. First, both labeled and unlabeled compounds can be visualized simultaneously in high spatial resolution along with their labeled and unlabeled precursors. Second, by using a thin film of labeled agar, we utilize minimum amounts of expensive labeled compounds (1-3 mg) ensuring a cost-effective method for investigating biosynthetic pathways. Finally, our method allows in situ visualization and identification of target and nontarget compounds without the need of isolating the compounds. This is important for compounds that are produced by microorganisms in low, physiologically, or ecologically relevant concentrations.
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Affiliation(s)
- Dennis Eckelmann
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry , TU Dortmund , Otto-Hahn-Straße 6 , 44221 Dortmund , Germany
| | - Souvik Kusari
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry , TU Dortmund , Otto-Hahn-Straße 6 , 44221 Dortmund , Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry , TU Dortmund , Otto-Hahn-Straße 6 , 44221 Dortmund , Germany
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Kamtcha DW, Tene M, Bedane KG, Knauer L, Brieger L, Strohmann C, Tane P, Kusari S, Spiteller M. Cardenolides and dihydro-β-agarofuran sesquiterpenes from the seeds of Salacia staudtiana. Fitoterapia 2018; 131:174-181. [DOI: 10.1016/j.fitote.2018.10.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 10/15/2018] [Accepted: 10/19/2018] [Indexed: 01/07/2023]
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Ivanova BB, Spiteller M. On the [2+2] cycloaddition reaction of configurationally locked polyenes – An experimental and theoretical study. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.05.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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37
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Sezgin S, Hassan R, Zühlke S, Kuepfer L, Hengstler JG, Spiteller M, Ghallab A. Spatio-temporal visualization of the distribution of acetaminophen as well as its metabolites and adducts in mouse livers by MALDI MSI. Arch Toxicol 2018; 92:2963-2977. [DOI: 10.1007/s00204-018-2271-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Accepted: 07/17/2018] [Indexed: 01/20/2023]
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Eckelmann D, Spiteller M, Kusari S. Spatial-temporal profiling of prodiginines and serratamolides produced by endophytic Serratia marcescens harbored in Maytenus serrata. Sci Rep 2018; 8:5283. [PMID: 29588473 PMCID: PMC5869619 DOI: 10.1038/s41598-018-23538-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Accepted: 03/15/2018] [Indexed: 12/21/2022] Open
Abstract
An endophytic bacterium, Serratia marcescens MSRBB2, isolated from inner bark of a Cameroonian Maytenus serrata plant, was subjected to the OSMAC (One Strain Many Compounds) approach and metabolic profiling using HPLC-HRMSn. We identified 7 prodiginines along with 26 serratamolides. Their biosynthetic pathways were elucidated by feeding with labeled precursors in combination with HRMSn. Dual-culture confrontation/restriction assays of the bacterial endophyte were devised with coexisting fungal endophytes (Pestalotiopsis virgatula, Aspergillus caesiellus and Pichia spp.) as well as with unrelated, non-endophytic fungi belonging to the same genera. The assays were combined with scanning electron microscopy (SEM) as well as matrix-assisted laser desorption ionization imaging high-resolution mass spectrometry (MALDI-imaging-HRMS) for visualizing, both in high spatial and temporal resolution, the distribution and interplay of the compounds during microbial interactions. We demonstrated the effect of prodigiosin produced by endophytic S. marcescens MSRBB2 as an allelochemical that specifically inhibits coexisting endophytic fungi. Our results provide new insights into the physiological and ecological relevance of prodiginines and serratamolides within the context of allelopathy and chemical defense interaction occurring between coexisting endophytes harbored in M. serrata.
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Affiliation(s)
- Dennis Eckelmann
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Straße 6, 44221, Dortmund, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Straße 6, 44221, Dortmund, Germany
| | - Souvik Kusari
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Straße 6, 44221, Dortmund, Germany.
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Ivanova B, Spiteller M. Cation-π-complex of Ag(I) ion with 1H-indole-5-carboxylic acid – Structural analysis and energetics of the M–L bonds. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.10.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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40
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Happi GM, Talontsi FM, Laatsch H, Zühlke S, Ngadjui BT, Spiteller M, Kouam SF. seco -Tiaminic acids B and C: Identification of two novel 3,4- seco -tirucallane triterpenoids isolated from the root of Entandrophragma congoënse (Meliaceae). Fitoterapia 2018; 124:17-22. [DOI: 10.1016/j.fitote.2017.10.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Revised: 10/02/2017] [Accepted: 10/03/2017] [Indexed: 10/18/2022]
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41
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Kohnen KL, Sezgin S, Spiteller M, Hagels H, Kayser O. Localization and Organization of Scopolamine Biosynthesis in Duboisia myoporoides R. Br. Plant Cell Physiol 2018; 59:107-118. [PMID: 29095998 DOI: 10.1093/pcp/pcx165] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 10/25/2017] [Indexed: 05/11/2023]
Abstract
Tropane alkaloids (TAs), especially hyoscyamine and scopolamine, are important precursors for anticholinergic and antispasmodic drugs. Hyoscyamine and scopolamine are currently obtained at commercial scale from hybrid crosses of Duboisia myoporoides × Duboisia leichhardtii plants. In this study, we present a global investigation of the localization and organization of TA biosynthesis in a Duboisia myoporoides R. Br. wild-type line. The tissue-specific spatial distribution of TAs within D. myoporoides is presented, including quantification of the TAs littorine, 6-hydroxy hyoscyamine, hyoscyamine, scopolamine and, additionally, hyoscyamine aldehyde as well as scopolamine glucoside. Scopolamine (14.77 ± 5.03 mg g-1), and to a lesser extent hyoscyamine (3.01 ± 1.54 mg g-1) as well as 6-hydroxy hyoscyamine (4.35 ± 1.18 mg g-1), are accumulated in leaves during plant development, with the highest concentration of total TAs detected in 6-month-old plants. Littorine, an early precursor in TA biosynthesis, was present only in the roots (0.46 ± 0.07 mg g-1). During development, the spatial distribution of all investigated alkaloids changed due to secondary growth in the roots. Transcripts of pmt, tr-I and cyp80f1 genes, involved in early stages of TA biosynthesis, were found to be most abundant in the roots. In contrast, the transcript encoding hyoscyamine 6β-hydroxylase (h6h) was highest in the leaves of 3-month-old plants. This investigation presents the spatial distribution of biochemical components as well as gene expression profiles of genetic factors known to participate in TA biosynthesis in D. myoporoides. The results of this investigation may aid in future breeding or genetic enhancement strategies aimed at increasing the yields of TAs in these medicinally valuable plant species.
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Affiliation(s)
- Kathrin Laura Kohnen
- Technical Biochemistry, Department of Biochemical and Chemical Engineering, Technical University Dortmund, D-44227 Dortmund, Germany
| | - Selahaddin Sezgin
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University Dortmund, D-44227 Dortmund, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University Dortmund, D-44227 Dortmund, Germany
| | - Hansjörg Hagels
- Boehringer Ingelheim Pharma GmbH und Co. KG, 55216 Ingelheim am Rhein, Germany
| | - Oliver Kayser
- Technical Biochemistry, Department of Biochemical and Chemical Engineering, Technical University Dortmund, D-44227 Dortmund, Germany
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Ivanova B, Spiteller M. Quantitative collision induced mass spectrometry of substituted piperazines – A correlative analysis between theory and experiment. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.07.107] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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43
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Ivanova B, Spiteller M. On the nature of the coordination bonding of metal–organics for ions with the d 10 electronic configuration – Experimental and theoretical analyses. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.08.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Kusari S, Eckelmann D, Spiteller M. In situ MALDI-HRMS-imaging of Maytenus senegalensis during the germination process reveals the ecological role of the important anticancer compound maytansine. Am J Transl Res 2017. [DOI: 10.1055/s-0037-1608245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- S Kusari
- Institute of Environmental Research (INFU), TU Dortmund, Dortmund, Germany
| | - D Eckelmann
- Institute of Environmental Research (INFU), TU Dortmund, Dortmund, Germany
| | - M Spiteller
- Institute of Environmental Research (INFU), TU Dortmund, Dortmund, Germany
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Daoud F, Pelzer D, Zuehlke S, Spiteller M, Kayser O. Ozone pretreatment of process waste water generated in course of fluoroquinolone production. Chemosphere 2017; 185:953-963. [PMID: 28747007 DOI: 10.1016/j.chemosphere.2017.07.040] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 06/23/2017] [Accepted: 07/09/2017] [Indexed: 06/07/2023]
Abstract
During production of active pharmaceutical ingredients, process waste water is generated at several stages of manufacturing. Whenever possible, the resulting waste water will be processed by conventional waste water treatment plants. Currently, incineration of the process waste water is the method to eliminate compounds with high biological activity. Thus, ozone treatment followed by biological waste water treatment was tested as an alternative method. Two prominent representatives of the large group of fluoroquinolone antibiotics (ciprofloxacin and moxifloxacin) were investigated, focussing on waste water of the bulk production. Elimination of the target compounds and generation of their main transformation products were determined by liquid chromatography - high resolution mass spectrometry (LC-HRMS). The obtained results demonstrated, that the concentration of moxifloxacin and its metabolites can be effectively reduced (>99.7%) prior entering the receiving water. On the contrary, the concentration of ciprofloxacin and its metabolites remained too high for safe discharge, necessitating application of prolonged ozonation for its further degradation. The required ozonation time can be estimated based on the determined kinetics. To assure a low biological activity the ecotoxicity of the ozonated waste water was investigated using three trophic levels. By means of multiple-stage mass spectrometry (MSn) experiments several new transformation products of the fluoroquinolones were identified. Thus, previously published proposed structures could be corrected or confirmed.
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Affiliation(s)
- Fares Daoud
- Bayer AG, Friedrich-Ebert-Str. 217-333, 42096 Wuppertal, Germany
| | - David Pelzer
- Organic Chemistry, Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Sebastian Zuehlke
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Technical University of Dortmund, Otto-Hahn Str. 6, 44227 Dortmund, Germany
| | - Oliver Kayser
- Department of Technical Biochemistry, Technical University of Dortmund, Emil-Figge-Str. 66, 44227 Dortmund, Germany.
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Nigutová K, Kusari S, Sezgin S, Petijová L, Henzelyová J, Bálintová M, Spiteller M, Čellárová E. Chemometric evaluation of hypericin and related phytochemicals in 17 in vitro cultured Hypericum species, hairy root cultures and hairy root-derived transgenic plants. J Pharm Pharmacol 2017; 71:46-57. [DOI: 10.1111/jphp.12782] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 06/11/2017] [Indexed: 01/19/2023]
Abstract
Abstract
Objectives
The objective of this study was to ascertain the presence and correlations among eight important secondary metabolites viz. hypericin, pseudohypericin, emodin, hyperforin, rutin, hyperoside, quercetin and quercitrin in different organs of 17 in vitro cultured Hypericum species, along with H. tomentosum and H. tetrapterum hairy root cultures, and hairy root-derived transgenic plants of H. tomentosum.
Methods
Samples were extracted and analysed by LC-MS. The LC-MS data were subjected to chemometric evaluations for metabolite profiling and correlating the phytochemical compositions in different samples.
Key findings
Hypericin, pseudohypericin and their proposed precursor emodin were detected in various levels in the leaves of eight Hypericum species. The highest content of hypericins and emodin was found in H. tetrapterum, which contains the studied secondary metabolites in all plant organs. A significant positive correlation between hypericins and emodin was observed both by principal component analysis (PCA) and multidimensional scaling (MDS), indicating the role of emodin as a possible precursor in the biosynthetic pathway of hypericins. Flavonoids were found in all tested plant organs except roots of H. pulchrum. The hairy roots lacked hypericin, pseudohypericin, emodin, hyperforin and rutin. However, the hairy root-derived transgenic plants showed a significant increase in flavonoids.
Conclusions
This study broadens knowledge about the phytochemical composition of selected in vitro cultured Hypericum species, compared to that of hairy root cultures and hairy root-derived transgenic plants.
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Affiliation(s)
- Katarína Nigutová
- Department of Genetics, Institute of Biology and Ecology, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
| | - Souvik Kusari
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | - Selahaddin Sezgin
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | - Linda Petijová
- Department of Genetics, Institute of Biology and Ecology, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
| | - Jana Henzelyová
- Department of Genetics, Institute of Biology and Ecology, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
| | - Miroslava Bálintová
- Department of Genetics, Institute of Biology and Ecology, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Dortmund, Germany
| | - Eva Čellárová
- Department of Genetics, Institute of Biology and Ecology, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
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Eckelmann D, Kusari S, Spiteller M. Spatial profiling of maytansine during the germination process of Maytenus senegalensis seeds. Fitoterapia 2017; 119:51-56. [DOI: 10.1016/j.fitote.2017.03.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 03/27/2017] [Accepted: 03/30/2017] [Indexed: 12/21/2022]
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Tatsimo SJN, Tamokou JDD, Tsague VT, Lamshoft M, Sarkar P, Bag PK, Spiteller M. Antibacterial-guided isolation of constituents from Senna alata leaves with a particular reference against Multi-Drug-Resistant Vibrio cholerae and Shigella flexneri. ACTA ACUST UNITED AC 2017. [DOI: 10.4314/ijbcs.v11i1.4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Abstract
Covering: 2009 to 2015Lignans and neolignans are a large group of natural products derived from the oxidative coupling of two C6-C3 units. Owing to their biological activities ranging from antioxidant, antitumor, anti-inflammatory to antiviral properties, they have been used for a long time both in ethnic as well as in conventional medicine. This review describes 564 of the latest examples of naturally occurring lignans and neolignans, and their glycosides in some cases, which have been isolated between 2009 and 2015. It comprises the data reported in more than 200 peer-reviewed articles and covers their source, isolation, structure elucidation and bioactivities (where available), and highlights the biosynthesis and total synthesis of some important ones.
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Affiliation(s)
- Rémy Bertrand Teponno
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, 44221 Dortmund, Germany. and Department of Chemistry, Faculty of Science, University of Dschang, P. O. Box 67, Dschang, Cameroon
| | - Souvik Kusari
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, 44221 Dortmund, Germany.
| | - Michael Spiteller
- Institute of Environmental Research (INFU), Department of Chemistry and Chemical Biology, Chair of Environmental Chemistry and Analytical Chemistry, TU Dortmund, Otto-Hahn-Str. 6, 44221 Dortmund, Germany.
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Tala MF, Talontsi FM, Zeng GZ, Wabo HK, Spiteller M, Tan NH, Tane P. Phytochemical Analysis of a Cytotoxic Fraction of Quassia silvestris using LC-HR-ESI-MS n. Phytochem Anal 2017; 28:210-216. [PMID: 28028887 DOI: 10.1002/pca.2663] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 10/15/2016] [Accepted: 10/24/2016] [Indexed: 06/06/2023]
Abstract
INTRODUCTION The genus Quassia is a promising source of secondary metabolites with biological potential including antimalarial and cytotoxic activities. Limited data are available on the phytochemistry and pharmacology of Quassia silvestris Cheek & Jongkind, a Cameroonian medicinal plant used to treat various ailments. OBJECTIVES To carry out the bioassay-guided fractionation and LC-HR-ESI-MS analyses of the leaves extract from Q. silvestris; to purify the active fractions and isolate the major compounds using different chromatographic and spectroscopic methods. The obtained compounds will be evaluated for their biological activity. MATERIAL AND METHODS Following the cytotoxic screening and LC-HR-ESI-MS profiling of fractions obtained from partition of the methanolic extract of Q. silvestris leaves, the CH2 Cl2 -soluble fraction which exhibited the highest cytotoxicity was retained for further investigations. RESULTS Sixteen squalene-derived metabolites were identified with oxasqualenoid derivatives being the most predominant. Among the isolates, structure elucidation of two new oxasqualenoids quassiols E (1) and F (2), were achieved by NMR (one-dimensional (1D) and two-dimensional (2D)) and MS methods. The newly characterised compounds 1 and 2, together with the known tetraol (3) and 3-oxo-oleanoic acid (16) displayed moderate cytotoxicity. CONCLUSION The identification and structural characterisation of highly oxidised squalene derived metabolites from this plant may provide important insight data for further pharmacological investigations. The LC-HR-ESI-MSn method reported here could be developed as a rapid and efficient tool for the analyses of structurally related compounds in the genera Quassia, Simarouba, and Eurycoma of the subfamily Simarouboideae. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Michel Feussi Tala
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, P.R. China
| | - Ferdinand Mouafo Talontsi
- Institute of Environmental Research (INFU) of the Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221, Dortmund, Germany
| | - Guang-Zhi Zeng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, P.R. China
| | | | - Michael Spiteller
- Institute of Environmental Research (INFU) of the Faculty of Chemistry and Chemical Biology, TU Dortmund, Otto-Hahn-Str. 6, D-44221, Dortmund, Germany
| | - Ning-Hua Tan
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
| | - Pierre Tane
- Department of Chemistry, University of Dschang, P.O. Box 67, Dschang, Cameroon
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