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New Coumarin Derivatives and Other Constituents from the Stem Bark of Zanthoxylum avicennae: Effects on Neutrophil Pro-Inflammatory Responses. Int J Mol Sci 2015; 16:9719-31. [PMID: 25938967 PMCID: PMC4463613 DOI: 10.3390/ijms16059719] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 04/10/2015] [Accepted: 04/14/2015] [Indexed: 11/17/2022] Open
Abstract
Three new coumarin derivatives, 8-formylalloxanthoxyletin (1), avicennone (2), and (Z)-avicennone (3), have been isolated from the stem bark of Zanthoxylum avicennae (Z. avicennae), together with 15 known compounds (4–18). The structures of these new compounds were determined through spectroscopic and MS analyses. Compounds 1, 4, 9, 12, and 15 exhibited inhibition (half maximal inhibitory concentration (IC50) values ≤7.65 µg/mL) of superoxide anion generation by human neutrophils in response to formyl-l-methionyl-l-leucyl-l-phenylalanine/cytochalasin B (fMLP/CB). Compounds 1, 2, 4, 8 and 9 inhibited fMLP/CB-induced elastase release with IC50 values ≤8.17 µg/mL. This investigation reveals bioactive isolates (especially 1, 2, 4, 8, 9, 12 and 15) could be further developed as potential candidates for the treatment or prevention of various inflammatory diseases.
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Controlled oxidation of aliphatic CH bonds in metallo-monooxygenases: Mechanistic insights derived from studies on deuterated and fluorinated hydrocarbons. J Inorg Biochem 2014; 134:118-33. [DOI: 10.1016/j.jinorgbio.2014.02.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2013] [Revised: 01/06/2014] [Accepted: 02/11/2014] [Indexed: 01/01/2023]
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3
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Pelit FO, Demirdöğen RE, Henden E. Investigation of heavy metal content of Turkish tobacco leaves, cigarette butt, ash, and smoke. ENVIRONMENTAL MONITORING AND ASSESSMENT 2013; 185:9471-9. [PMID: 23712460 DOI: 10.1007/s10661-013-3266-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 05/17/2013] [Indexed: 06/02/2023]
Abstract
A procedure for the determination of cadmium, copper, manganese, and zinc in Turkish tobaccos, which were of different origins, years, and grades, and in the butt, ash, and smoke, which were obtained by smoking the cigarettes that were prepared manually from the said tobaccos in a smoking apparatus, was devised as proposed. The collected samples were digested by wet ashing technique by using HNO3-HClO4 and were analyzed by flame atomic absorption spectrometry with satisfactory recoveries (94% to 98%). The regression coefficients were above 0.99, and the detection limits were in the range of 0.03-0.12 mg/L(-1). The performance and accuracy of the method was tested by analyzing "Certified Reference Material GBW 08501-Peach Leaves." The determined values were in agreement with the standard values for the heavy metals analyzed. Thus, it was concluded that the developed method could offer a wide range of application for establishing a relationship between the makeup and composition of tobacco plant, products, ash, smoke, and smoking.
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Affiliation(s)
- Füsun Okçu Pelit
- Department of Chemistry, Faculty of Science, Ege University, 35100, Bornova-İzmir, Turkey,
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Hu QF, Wu XH, Yang GY, Huang ZJ, Yin JY. Study on the Determination of Cobalt, Nickel, Copper, Zinc and Vanadium in Environmental Samples by a Rapid High-Performance Liquid Chromatography. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200500042] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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5
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Mohammadhosseini M, Tehrani MS, Ganjali MR. Preconcentration, Determination and Speciation of Chromium(III) Using Solid Phase Extraction and Flame Atomic Absorption Spectrometry. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200600072] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Ghaedi M, Niknam K, Shokrollahi A, Niknam E. Determination of Cu, Fe, Pb and Zn by Flame-AAS after Preconcentration Using Sodium Dodecyl Sulfate Coated Alumina Modified with Complexing Agent. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200900021] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Maji S, Lee JCM, Lu YJ, Chen CL, Hung MC, Chen PPY, Yu SSF, Chan SI. Dioxygen Activation of a Trinuclear CuICuICuI Cluster Capable of Mediating Facile Oxidation of Organic Substrates: Competition between O-Atom Transfer and Abortive Intercomplex Reduction. Chemistry 2012; 18:3955-68. [DOI: 10.1002/chem.201103075] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2011] [Indexed: 11/09/2022]
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8
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Yang CH, Cheng MJ, Lee SJ, Yang CW, Chang HS, Chen IS. Secondary metabolites and cytotoxic activities from the stem bark of Zanthoxylum nitidum. Chem Biodivers 2009; 6:846-57. [PMID: 19551734 DOI: 10.1002/cbdv.200800107] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A dihydrobenzo[c]phenanthridine alkaloid, epizanthocadinanine A (1), together with 27 known compounds, including eight benzo[c]phenanthridines, i.e., oxynitidine (2), oxyavicine (3), oxychelerythrine (4), dihydrochelerythrine (5), 6-acetonyldihydrochelerythrine (6), norchelerythrine (7), decarine (8), and arnottianamide (9); two 2-quinolones, i.e., flindersine (10) and 4-methoxy-1-methyl-2-quinolone (11); two furoquinolines, i.e., skimmianine (12) and gamma-fagarine (13); three aporphines, i.e., liriodenine (14), N-acetyldehydroanonaine (15), and N-acetylanonaine (16); six lignans, i.e., sesamin (17), episesamin (18), piperitol-3,3-dimethylallyl ether (19), xanthoxylol-3,3-dimethylallyl ether (20), savinin (21), and 2,3-bis(3,4-methylenedioxybenzyl)but-2-en-4-olide (22); three terpenoids, i.e., alpha-cadinol (23), anticopalol (24), and spathulenol (25); one coumarin, i.e., aesculetin dimethyl ether (26); and two steroids, i.e., beta-sitosterol (27) and beta-sitostenone (28) were isolated from the stem bark of Zanthoxylum nitidum. Their structures were elucidated on the basis of extensive 1D- and 2D-NMR as well as MS analyses. Moreover, the recently reported structures 2'-4' of rhoifolines B and A, and '8-methoxynorchelerythrine', resp., isolated as new compounds from Z. rhoifolium and Z. nitidum, resp., could be assigned the revised structures 2-4 by reinvestigation of the spectroscopic data. In addition, the cytotoxicity of the isolates was evaluated on the MCF-7, NCI-H460, and SF-268 cell lines. Among these isolates, liriodenine (14) was the most active compound against the MCF-7, NCI-H460, and SF-268 cell lines with IC(50) values of 2.19, 2.38, and 3.19 microg/ml, resp.
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Affiliation(s)
- Cheng-Hui Yang
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan 807, R. O. C
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Prenyloxyphenylpropanoids as a novel class of anticonvulsive agents. Bioorg Med Chem Lett 2009; 19:5419-22. [PMID: 19679472 DOI: 10.1016/j.bmcl.2009.07.110] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2009] [Revised: 07/22/2009] [Accepted: 07/23/2009] [Indexed: 12/19/2022]
Abstract
In this study, we synthesized some natural and semi-synthetic prenyloxyphenylpropanoids (e.g., acetophenones, benzoic and cinnamic acids, chalcones, and coumarins), and we assessed their in vivo neuroprotective activity, using the mouse maximal electroshock-induced seizure model (MES test). 7-Isopentenyloxycoumarin and (2E)-3-{4-[(3-methylbut-2-enyl)oxy]phenyl}prop-2-enoic acid, administered ip at a dose of 300 mg/kg, suppressed MES-induced seizures in mice in a time- and dose-dependent manner.
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Omar WA, Hormi OE. Synthesis of 4-(2-arylvinyl)-8-hydroxyquinolines via anhydrous Heck coupling reaction and the PL properties of their Al complexes. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.03.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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11
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A New Dihydroagarofuranoid Sesquiterpene and Antituberculosis Constituents from the Root ofMicrotropis japonica. Chem Biodivers 2008; 5:1412-8. [DOI: 10.1002/cbdv.200890129] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Veitch NC, Grayer RJ. Flavonoids and their glycosides, including anthocyanins. Nat Prod Rep 2008; 25:555-611. [DOI: 10.1039/b718040n] [Citation(s) in RCA: 216] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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MOGHIMI A, SABER-TEHRANI M, WAQIF-HUSAIN S, MOHAMMADHOSSEINI M. Preconcentration and Determination of Chromium Species Using Octadecyl Silica Membrane Disks and Flame Atomic Absorption Spectrometry. CHINESE J CHEM 2007. [DOI: 10.1002/cjoc.200790343] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Chou TH, Chen IS, Sung PJ, Peng CF, Shieh PC, Chen JJ. A New Dihydroagarofuranoid Sesquiterpene fromMicrotropis fokienensis with Antituberculosis Activity. Chem Biodivers 2007; 4:1594-600. [PMID: 17638341 DOI: 10.1002/cbdv.200790139] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A new dihydroagarofuran-based sesquiterpene, 8-acetoxymutangin (1), was isolated from the stems of Microtropis fokienensis, together with eight known compounds, including mutangin (2). Their structures were determined through in-depth spectroscopic and mass-spectrometric analyses. Among the isolated compounds, 1 exhibited potent in vitro antituberculosis activity, with an MIC value of 10.0 microg/ml against Mycobacterium tuberculosis 90-221387, which is considerably better than that of mutangin (2). The activity of 1 lies in the same range as that of the clinic drug ethambutol (MIC 6.25 microg/ml), despite completely different chemical structures, which indicates different modes of action.
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Affiliation(s)
- Tsung-Hsien Chou
- Graduate Institute of Pharmaceutical Technology, Tajen University, Pingtung 907, Taiwan
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Pratap R, Ram VJ. 2-Oxobenzo[h]chromene: a novel entry for the synthesis of functionalized angular polycyclic azaarenes. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.106] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Chan S, Wang VC, Lai JH, Yu SF, Chen PY, Chen KC, Chen CL, Chan M. Redox Potentiometry Studies of Particulate Methane Monooxygenase: Support for a Trinuclear Copper Cluster Active Site. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604647] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Chan SI, Wang VCC, Lai JCH, Yu SSF, Chen PPY, Chen KHC, Chen CL, Chan MK. Redox Potentiometry Studies of Particulate Methane Monooxygenase: Support for a Trinuclear Copper Cluster Active Site. Angew Chem Int Ed Engl 2007; 46:1992-4. [PMID: 17274089 DOI: 10.1002/anie.200604647] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sunney I Chan
- Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan 11529, Republic of China.
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de Fatima Pereira M, Thiéry V, Besson T. Synthesis of novel 2,3-substituted quinazolin-4-ones by condensation of alkyl or aromatic diamines with 5-(N-arylimino)-4-chloro-5H-1,2,3-dithiazoles. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.11.028] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Lomas JS, Adenier A, Cordier C. Proton NMR and IR study of self-association in pyridylalkanols: open or cyclic dimers? higher polymers? J PHYS ORG CHEM 2006. [DOI: 10.1002/poc.1056] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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20
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Chen PPY, Chan SI. Theoretical modeling of the hydroxylation of methane as mediated by the particulate methane monooxygenase. J Inorg Biochem 2006; 100:801-9. [PMID: 16494948 DOI: 10.1016/j.jinorgbio.2005.12.014] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2005] [Accepted: 12/13/2005] [Indexed: 11/22/2022]
Abstract
We present here the results of density functional theory (DFT) calculations directed toward elucidation of the CH bond activation mechanism that might be adopted by the particulate methane monooxygenase (pMMO) in the hydroxylation of methane and related small alkanes. In these calculations, we considered three of the most probable models for the transition metal active site mediating the "oxo-transfer": (i) the trinuclear copper cluster bis(mu(3)-oxo)trinuclear copper(II, II, III) complex 1, recently proposed by Chan et al. [S.I. Chan, K.H.-C. Chen, S.S.-F. Yu, C.-L. Chen, S.S.-J. Kuo, Biochemistry 43 (2004) 4421-4430.]; (ii) the most frequently used model complex, bis(mu-oxo)Cu(III)(2) complex 2; and (iii) the mixed-valence bis(mu-oxo)Cu(II)Cu(III) complex 3. The results obtained indicate that the methane hydroxylation chemistry mediated by the trinuclear copper cluster bis(mu(3)-oxo)trinuclear copper(II, II, III) complex 1 offers the most facile pathway for methane hydroxylation, and this model yields KIE values that are in good agreement with experiment. In this mechanism, the reaction proceeds along a "singlet" potential surface and a "singlet oxene" is directly inserted across a CH bond in a concerted manner. Kinetic isotope effects (k(H)/k(D) or KIE) associated with the concerted oxene insertion process mediated by complex 1 are calculated to be 5.2 at 300K when tunneling effects are included. Overall rate constants for the methane hydroxylation by the three models have been calculated as a function of temperature, and the rates are at least 5-6 orders of magnitude more facile when the chemistry is mediated by complex 1 compared to complex 2 or complex 3.
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Affiliation(s)
- Peter P-Y Chen
- Institute of Chemistry, Academia Sinica, 128 Section 2, Academia Road, Nankang, Taipei 115, Taiwan, ROC
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Osuji LC, Avwiri GO. Flared Gases and Other Pollutants Associated with Air Quality in Industrial Areas of Nigeria: An Overview. Chem Biodivers 2005; 2:1277-89. [PMID: 17191928 DOI: 10.1002/cbdv.200590099] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Nigeria, like any other developing nation, is faced with the twin problem of development without destruction. Industrialization, though an important component of development, has had a large share in the despoilation of air quality in the country by the release of high amounts of pollutants into the atmosphere. Petroleum hydrocarbons from refineries, flared gases, dusts, and fumes of metal-smelting and cement works, odorous gases of chemical and allied industries, carbon monoxide and oxides of sulfur and nitrogen of internal combustion engines, the charred particulates and sulfur dioxide emissions of the steel industries etc., all constitute pollutants or co-pollutants of the Nigerian atmosphere. This review article gives an insight into the phenomenal concentrations of some of these pollutants in the Nigerian atmosphere, which point to their unsafe levels and concomitant health risks. It is against this background that there should be continuous but sound monitoring exercise of the Nigerian environment, devoid of the peculiar mix of politics and science, in order to properly audit the quality of air, especially in areas of heavy industrial pollution. Such checks and balances would provide empirical data to assess the various trade-offs of atmospheric pollution in industrial areas of the country such as the Niger Delta region where oil and gas are produced. There should also be enforcement, thereof, of all existing and/or revised standards or regulations such as the compliance limits of the Department of Petroleum Resources (DPR) or the erstwhile Federal Environmental Protection Agency (FEPA).
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Affiliation(s)
- Leo C Osuji
- Department of Pure and Industrial Chemistry, University of Port Harcourt, P.M.B. 5323 Choba, Port Harcourt, Nigeria.
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Affiliation(s)
- Joseph P Michael
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Wits, 2050, South Africa.
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Lieberman RL, Rosenzweig AC. The quest for the particulate methane monooxygenase active site. Dalton Trans 2005:3390-6. [PMID: 16234916 DOI: 10.1039/b506651d] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Particulate methane monooxygenase is a copper-containing, membrane-bound metalloenzyme that converts methane to methanol in Nature. How pMMO accomplishes this difficult reaction under ambient conditions is one of the major unsolved problems in bioinorganic chemistry. Despite considerable research efforts in the past 20 years, the active site of the enzyme remains unknown. We recently solved the first crystal structure of pMMO to 2.8 è resolution, revealing the overall structure, oligomerization state, subunit ratio, and composition and location of the metal centers. Almost none of the key structural features were predicted. In this Perspective, we review the state of knowledge before and after the structure determination, emphasizing elucidation of the pMMO active site.
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Affiliation(s)
- Raquel L Lieberman
- Department of Biochemistry, Northwestern University, Evanston, Illinois 60208, USA
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