51
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Ito C, Itoigawa M, Furukawa A, Hirano T, Murata T, Kaneda N, Hisada Y, Okuda K, Furukawa H. Quinolone alkaloids with nitric oxide production inhibitory activity from Orixa japonica. JOURNAL OF NATURAL PRODUCTS 2004; 67:1800-3. [PMID: 15568765 DOI: 10.1021/np0401462] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Four new quinolone alkaloids, orixalone A (1), B (2), C (3), and D (4), together with 12 known compounds were isolated from the stems of Orixa japonica. Orixalone A (1) inhibited nitric oxide production in murine macrophage-like RAW 264.7 cells stimulated with interferon-gamma and lipopolysaccharide.
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52
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Sunderland J, Lovering AM, Tobin CM, MacGowan AP, Roe JM, Delsol AA. A reverse-phase HPLC assay for the simultaneous determination of enrofloxacin and ciprofloxacin in pig faeces. Int J Antimicrob Agents 2004; 23:390-3. [PMID: 15081089 DOI: 10.1016/j.ijantimicag.2003.07.014] [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] [Received: 06/23/2003] [Accepted: 07/18/2003] [Indexed: 11/26/2022]
Abstract
A reverse-phase HPLC assay is described for the simultaneous assay of enrofloxacin (ENR) and ciprofloxacin (CPX) in pig faeces. Extraction used dichloromethane, 2-propanol and 0.3M ortho-phosphoric acid (1:5:4 v/v/v). Separation was achieved using a Spherisorb S5 C8 column, heated to 50 degrees C and a mobile phase of 0.16% ortho-phosphoric acid (adjusted to pH 3.0 with tetrabutylammonium hydroxide solution) with 20 ml acetonitrile per litre solution. The method used fluorescence detection (Ex 310 nm; Em 445 nm), a flow rate of 1 ml/min and a 20 microl injection volume. Retention times were approximately 6 min for ciprofloxacin and 10 min for enrofloxacin. The linearity range for both compounds was 0-20 mg/kg, lowest limit of quantification 0.3 mg/kg and recoveries were >92%.
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53
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Subbaraju GV, Kavitha J, Rajasekhar D, Jimenez JI. Jusbetonin, the first indolo[3,2-b]quinoline alkaloid glycoside, from Justicia betonica. JOURNAL OF NATURAL PRODUCTS 2004; 67:461-462. [PMID: 15043432 DOI: 10.1021/np030392y] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A new indolo[3,2-b]quinoline alkaloid glycoside, jusbetonin (1), and three known alkaloids, namely, 10H-quindoline (2), 6H-quinindoline (3), and 5H,6H-quinindolin-11-one (4), have been isolated from the leaves of Justicia betonica. The structure of 1 was established on the basis of 1D and 2D NMR ((1)H-(1)H COSY, HMQC, and HMBC) and HRFABMS data. Compound 1 is the first example of a glycosylated indolo[3,2-b]quinoline alkaloid, while compound 4 was isolated for the first time from a natural source.
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54
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Jiménez-Lozano E, Roy D, Barrón D, Barbosa J. Effective sorbents for solid-phase extraction in the analysis of quinolones in animal tissues by capillary electrophoresis. Electrophoresis 2004; 25:65-73. [PMID: 14730570 DOI: 10.1002/elps.200305656] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In this work, several commercial sorbents (Zorbax C18, Bond Elut C18, Isolute ENV+, Oasis HLB, Oasis MAX, SDB-RPS, and MPC-SD) were compared for the solid-phase extraction of the series of quinolones regulated by the European Community in chicken tissues in order to establish a method for the determination of this series of quinolones by capillary electrophoresis and diode array detection. Sorbents were chosen in order to achieve maximum recoveries and optimal clean-up efficiency. Better results were obtained using SDB-RPS and Oasis MAX which would provide suitable limits of detection, below of the maximum residue limits (MRLs) regulated.
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55
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Jin HZ, Lee JH, Lee D, Lee HS, Hong YS, Kim YH, Lee JJ. Quinolone Alkaloids with Inhibitory Activity against Nuclear Factor of Activated T Cells from the Fruits of Evodia rutaecarpa. Biol Pharm Bull 2004; 27:926-8. [PMID: 15187449 DOI: 10.1248/bpb.27.926] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nine quinolone alkaloids (1-9) from the fruits of Evodia rutaecarpa were investigated for their inhibitory activity on nuclear factor of activated T cells (NFAT)-dependent transcription in comparison with nuclear factor (NF)-kappa B-dependent transcription using a reporter gene assay. These alkaloids showed inhibitory effects against NFAT activity, with IC(50) values between 0.91 microM and 15.91 microM. Of the N-methylated quinolones, the longer aliphatic side chain at the quinolone ring showed stronger inhibition of NFAT activity. These N-methylated compounds showed comparable inhibitory effects against NF-kappa B activity. However, quinolone alkaloids without the N-methyl group showed a more selective inhibition of NFAT activity.
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56
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Tani M, Gyobu Y, Sasaki T, Takenouchi O, Kawamura T, Kamimura T, Harada T. SF2809 Compounds, Novel Chymase Inhibitors from Dactylosporangium sp. 1. Taxonomy, Fermentation, Isolation and Biological Properties. J Antibiot (Tokyo) 2004; 57:83-8. [PMID: 15112955 DOI: 10.7164/antibiotics.57.83] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Six novel chymase inhibitors, SF2809-I, SF2809-II, SF2809-III, SF2809-IV, SF2809-V and SF2809-VI, were isolated from the fermentation broth of an actinomycete strain SF2809. The strain was identified as Dactylosporangium sp. by morphological, chemotaxonomical and phylogenetic studies. These six novel compounds inhibited recombinant human chymase in the range between IC50 of 0.014 and 7.3 microM. However, they showed little or no inhibitory activity against chymotrypsin or cathepsin G, even though these two and chymase belong to the chymotryptic serine protease family. This result indicates that these compounds work as specific chymase inhibitors.
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57
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Shim JH, Lee MH, Kim MR, Lee CJ, Kim IS. Simultaneous measurement of fluoroquinolones in eggs by a combination of supercritical fluid extraction and high pressure liquid chromatography. Biosci Biotechnol Biochem 2003; 67:1342-8. [PMID: 12843663 DOI: 10.1271/bbb.67.1342] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Simultaneous detection of the fluoroquinolone antibiotics ciprofloxacin, enrofloxacin, ofloxacin, and norfloxacin in eggs by a combination of supercritical fluid extraction (SFE) and high pressure liquid chromatography (HPLC) was studied. Lipid matrices that have been considered to result in poor extraction and isolation of fluoroquinolones in eggs were removed first by SFE with supercritical CO(2) alone, and then the fluoroquinolones were extracted by SFE with supercritical CO(2) containing 20% (v/v) methanol for HPLC analysis. A time-course study of the extraction of lipid matrices of eggs suggested that the SFE method successfully removed the matrices within 20 min. When the fluoroquinolones added to control eggs were extracted by SFE, the extraction efficiency was similar to that by the solvent extraction method, giving the recovery percentages from 83 to 96% in a 40 min-extraction time. The fluoroquinolones extracted from eggs by SFE were analyzed simultaneously by HPLC equipped with a fluorescence detector with detection sensitivity at about 10 ppb for the detection limit. The standard calibration profiles of fluoroquinolones showed linear responses to HPLC, showing more than 0.995 for the mean r(2) value. This is the first report of the simultaneous measurement of fluoroquinolones in eggs by a combination of SFE and HPLC. Using the SFE method allowed us to avoid extensive sample preparation such as solvent extraction and chromatographic cleanup that are basically required in extraction of fluoroquinolones.
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58
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Lee MK, Hwang BY, Lee SA, Oh GJ, Choi WH, Hong SS, Lee KS, Ro JS. 1-methyl-2-undecyl-4(1H)-quinolone as an irreversible and selective inhibitor of type B monoamine oxidase. Chem Pharm Bull (Tokyo) 2003; 51:409-11. [PMID: 12672993 DOI: 10.1248/cpb.51.409] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The inhibitory compound of monoamine oxidase (MAO) activity was isolated from the CH(2)Cl(2) fraction of the fructus of Evodia rutaecarpa and identified as 1-methyl-2-undecyl-4(1H)-quinolone (1). Compound 1 showed a selective inhibition of type B MAO (MAO-B) activity with the IC(50) value of 15.3 microM using a substrate kynuramine, but did not inhibit type A MAO (MAO-A) activity. The kinetic analysis using Lineweaver-Burk plots indicated that compound 1 competitively inhibited MAO-B activity with the K(i) value of 9.91 microM. The inhibition of MAO-B by compound 1 was found to be irreversible by dialysis of the incubation mixture. These results suggest that compound 1 is a potent irreversible inhibitor of MAO-B, and may regulate catecholamine content in the neurons.
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59
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Oliva A, Meepagala KM, Wedge DE, Harries D, Hale AL, Aliotta G, Duke SO. Natural fungicides from Ruta graveolens L. leaves, including a new quinolone alkaloid. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2003; 51:890-6. [PMID: 12568545 DOI: 10.1021/jf0259361] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Bioassay-directed isolation of antifungal compounds from an ethyl acetate extract of Ruta graveolens leaves yielded two furanocoumarins, one quinoline alkaloid, and four quinolone alkaloids, including a novel compound, 1-methyl-2-[6'-(3' ',4' '-methylenedioxyphenyl)hexyl]-4-quinolone. The (1)H and (13)C NMR assignments of the new compound are reported. Antifungal activities of the isolated compounds, together with 7-hydroxycoumarin, 4-hydroxycoumarin, and 7-methoxycoumarin, which are known to occur in Rutaceae species, were evaluated by bioautography and microbioassay. Four of the alkaloids had moderate activity against Colletotrichum species, including a benomyl-resistant C. acutatum. These compounds and the furanocoumarins 5- and 8-methoxypsoralen had moderate activity against Fusarium oxysporum. The novel quinolone alkaloid was highly active against Botrytis cinerea. Phomopsis species were much more sensitive to most of the compounds, with P. viticola being highly sensitive to all of the compounds.
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60
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Tang Y, Wu K, Feng X, Huang L. [Synthesis and bioaction of 2-alkyl-4(1H)-quinolone]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 2002; 33:121-7. [PMID: 11938947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Five quinolone alkaloids (IVa, Va, c, d, g) including two new compounds (IVa, Vc) from Evodia rutaecarpa and nine analogs are synthesized in good yield by using acid-catalyzed condensation of a series of 3-oxoalkkanoic acid esters with aniline and further methylized with methyl iodide. The other analogue Vh is prepared through the reaction of lithium enolate methyl ketone with N-methylisatoic anhydride. Eight compounds (IVa, d, f; Vb, c, d, f, h) were synthesized for the first time. Pharmacological studies showed that these compounds have vasoconstriction inhibiting and antiulcer effects. Compound IVb also has cytotoxic effect.
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61
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Ko JS, Rho MC, Chung MY, Song HY, Kang JS, Kim K, Lee HS, Kim YK. Quinolone alkaloids, diacylglycerol acyltransferase inhibitors from the fruits of Evodia rutaecarpa. PLANTA MEDICA 2002; 68:1131-1133. [PMID: 12494344 DOI: 10.1055/s-2002-36358] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
From the diacylglycerol acyltransferase (DGAT) activity-guided fractionation, a new quinolone alkaloid, 1-methyl-2-tetradecyl-4(1H)-quinolone (1) was isolated from the fruits of Evodia rutaecarpa together with three known quinolone alkaloids, evocarpine (2), 1-methyl-2-[(4 Z,7 Z)-4,7-decadienyl]-4(1H)-quinolone (3) and 1-methyl-2-[(6 Z,9 Z)-6,9-pentadecadienyl]-4(1 H)-quinolone (4). They showed a dose-dependent DGAT inhibition with IC 50 values of 69.5 microM ( 1), 23.8 microM (2), 20.1 microM (3) and 13.5 mu (4).
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62
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Chen SB, Gao GY, Li YS, Yu SC, Xiao PG. Cytotoxic constituents from Aquilegia ecalcarata. PLANTA MEDICA 2002; 68:554-556. [PMID: 12094305 DOI: 10.1055/s-2002-32555] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new alkaloid, 7-hydroxy-4-(5'-hydroxymethylfuran-2'-yl)-2-quinolone (1), and a new nitrile derivative, 3alpha,4beta-dihydroxy-6-oxo-1-cyclohexene-1-acetonitrile (2), together with three known oxoaporphine alkaloids, were isolated from the whole plant of Aquilegia ecalcarata. Their structures were established on the basis of spectral evidence. Their in vitro cytotoxicity against different classes of cancer cell lines, including GLC-82 and HCT were determined. The new alkaloid 1 [IC 50 (GLC-82) 8.8 +/- 0.2 microM, IC 50 (HCT) 10.1 +/- 0.3 microM] and hernandonine ( 3) [IC 50 (GLC-82) 7.6 +/- 0.5 microM, IC 50 (HCT) 8.2 +/- 0.5 microM] exhibited cytotoxicity towards the cancer cell lines.
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63
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Puricelli L, Innocenti G, Delle Monache G, Caniato R, Filippini R, Cappelletti EM. In vivo and in vitro production of alkaloids by Haplophyllum patavinum. NATURAL PRODUCT LETTERS 2002; 16:95-100. [PMID: 11990434 DOI: 10.1080/10575630290019985] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
A protocol for shoot induction from callus of Haplophyllum patavinum was established. Two known furoquinoline (skimmianine and haplopine), and three quinolone (edulinine, ribalinine and isoplatydesmine) alkaloids were isolated for the first time from plant material, callus and shoot cultures of this species. The structures of these compounds have been characterised on the basis of spectroscopic evidence.
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64
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Royt PW, Honeychuck RV, Ravich V, Ponnaluri P, Pannell LK, Buyer JS, Chandhoke V, Stalick WM, DeSesso LC, Donohue S, Ghei R, Relyea JD, Ruiz R. 4-hydroxy-2-nonylquinoline: a novel iron chelator isolated from a bacterial cell membrane. Bioorg Chem 2001; 29:387-97. [PMID: 11846436 DOI: 10.1006/bioo.2001.1225] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The membrane associated iron chelator of Pseudomonas aeruginosa has been extracted from membranes of iron-rich cells with ethanol and purified by reverse phase HPLC. Using 13C NMR and FAB mass spectroscopy, the structure of the chelator has been determined to be 4-hydroxy-2-nonylquinoline. This compound has been previously isolated and named pseudan IX, a name which we use here. We synthesized pseudan IX and show that the spectral properties of the synthesized compound and the purified compound are nearly identical. Also purified from the ethanol extract of membranes is 4-hydroxy-2-heptylquinoline, i.e., pseudan VII. Bacterially purified pseudan IX binds iron as indicated by the incorporation of radiolabeled iron into the chelator and by the formation of pink micelles in a concentrated ethanol extract. The formation of pink micelles upon addition of iron to the synthesized compound indicates that it binds iron.
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65
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Chung HS, Woo WS. A quinolone alkaloid with antioxidant activity from the aleurone layer of anthocyanin-pigmented rice. JOURNAL OF NATURAL PRODUCTS 2001; 64:1579-1580. [PMID: 11754619 DOI: 10.1021/np010324g] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The aleurone layer of Oryza sativa cv. Heugjinmi yielded a new quinolone alkaloid, 4-carbomethoxy-6-hydroxy-2-quinolone (1), showing moderate antioxidative activity in a 1,1-diphenyl-2-picrylhydrazyl free-radical scavenging assay. Physical and spectroscopic evidence has determined the structure of the compound.
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66
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Sanz-Nebot V, Toro I, Barbosa J. Prediction of retention behaviour and evaluation of pka values of peptides and quinolones in liquid chromatography. J Chromatogr A 2001; 933:45-56. [PMID: 11758746 DOI: 10.1016/s0021-9673(01)01255-9] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The present paper examines the effect of the solute ionisation on the retention behaviour in liquid chromatography of a series of peptide and quinolone compounds of biological interest, using acetonitrile-water media as mobile phases and a polymeric-based stationary phase. Polymeric columns with polystyrene-divinylbenzene (PS-DVB) polymer show advantages over silica-based reversed-phase packings since the former are stable in a wide pH range. (s)(s)pKa values have been evaluated using chromatographic data in acetonitrile-water mixtures with acetonitrile percentages of 30, 35, 40 and 50% (v/v) for quinolones and 12.5 and 20% (v/v) for peptides. The quinolones show great retention on PS-DVB phase stationary. It was thus necessary to work with a higher acetonitrile content in the mobile phase than for the less retained peptides. The pH values were measured in the hydroorganic mixtures, used as mobile phases, instead of in water and account was taken of the effect of activity coefficients. The derived equations permit the chromatographic determination of (s)(s)pKa. values of the peptides and quinolones in acetonitrile-water mixtures by fitting it to the experimental data in a nonlinear least-square procedure and also permit the prediction of the effect of (s)(s)pH on their chromatographic behaviour. We have also compared the obtained (s)(s)pKa values with those previously obtained in acetonitrile-water mixtures from potentiometric measurements.
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67
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Kim WG, Song NK, Yoo ID. Quinolactacins A1 and A2, new acetylcholinesterase inhibitors from Penicillium citrinum. J Antibiot (Tokyo) 2001; 54:831-5. [PMID: 11776439 DOI: 10.7164/antibiotics.54.831] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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68
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Casapullo A, Cutignano A, Bruno I, Bifulco G, Debitus C, Gomez-Paloma L, Riccio R. Makaluvamine P, a new cytotoxic pyrroloiminoquinone from Zyzzya cf. fuliginosa. JOURNAL OF NATURAL PRODUCTS 2001; 64:1354-1356. [PMID: 11678667 DOI: 10.1021/np010053+] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new pyrroloiminoquinone alkaloid (1) belonging to the makaluvamine family has been isolated from the sponge Zyzzya cf. fuliginosa collected in the waters off the Vanuatu Islands. The compound, designated makulavamine P, was characterized on the basis of its spectral data and displayed cytoxicity in the microM range on KB cells and antioxidant activity.
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69
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Calfee MW, Coleman JP, Pesci EC. Interference with Pseudomonas quinolone signal synthesis inhibits virulence factor expression by Pseudomonas aeruginosa. Proc Natl Acad Sci U S A 2001; 98:11633-7. [PMID: 11573001 PMCID: PMC58781 DOI: 10.1073/pnas.201328498] [Citation(s) in RCA: 176] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen that controls numerous virulence factors through intercellular signals. This bacterium has two quorum-sensing systems (las and rhl), which act through the intercellular signals N-(3-oxododecanoyl)-l-homoserine lactone (3-oxo-C(12)-HSL) and N-butyryl-l-homoserine lactone (C(4)-HSL), respectively. P. aeruginosa also produces a third intercellular signal that is involved in virulence factor regulation. This signal, 2-heptyl-3-hydroxy-4-quinolone [referred to as the Pseudomonas quinolone signal (PQS)], is a secondary metabolite that is part of the P. aeruginosa quorum-sensing hierarchy. PQS can induce both lasB (encodes LasB elastase) and rhlI (encodes the C(4)-HSL synthase) in P. aeruginosa and is produced maximally during the late stationary phase of growth. Because PQS is an intercellular signal that is part of the quorum-sensing hierarchy and controls multiple virulence factors, we began basic studies designed to elucidate its biosynthetic pathway. First, we present data that strongly suggest that anthranilate is a precursor for PQS. P. aeruginosa converted radiolabeled anthranilate into radioactive PQS, which was bioactive. We also found that an anthranilate analog (methyl anthranilate) would inhibit the production of PQS. This analog was then shown to have a major negative effect on elastase production by P. aeruginosa. These data provide evidence that precursors of intercellular signals may provide viable targets for the development of therapeutic treatments that will reduce P. aeruginosa virulence.
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70
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Komatsu K, Shigemori H, Kobayashi J. Dictyonamides A and B, new peptides from marine-derived fungus. J Org Chem 2001; 66:6189-92. [PMID: 11529752 DOI: 10.1021/jo0156767] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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71
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Noshita T, Tando M, Suzuki K, Murata K, Funayama S. New quinoline alkaloids from the leaves and stems of Orixa japonica, orijanone, isopteleflorine and 3'-O-methylorixine. Biosci Biotechnol Biochem 2001; 65:710-3. [PMID: 11330697 DOI: 10.1271/bbb.65.710] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Orixajaponica (Rutaceae) is a shrub widely distributed in Japan, and has been found to contain various quinoline alkaloids. We investigated the alkaloidal constituents of O. japonica, and four quinoline alkaloids were isolated and characterized. Three of these alkaloids are new natural products.
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72
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Kusano M, Koshino H, Uzawa J, Fujioka S, Kawano T, Kimura Y. Nematicidal alkaloids and related compounds produced by the fungus Penicillium cf. simplicissimum. Biosci Biotechnol Biochem 2000; 64:2559-68. [PMID: 11210117 DOI: 10.1271/bbb.64.2559] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A new nematicidal alkaloid, peniprequinolone (1), together with the known alkaloids penigequinolones A and B (2a, 2b), 3-methoxy-4-hydroxy-4-(4'-methoxyphenyl)quinolinone (3), and 3-methoxy-4,6-dihydroxy-4-(4'-methoxyphenyl)quinolinone (4), were isolated from Penicillium cf. simplicissimum (Oudemans) Thom. Cyclopenin (5) and a compound (6a/6b) structurally related to cyclopenin also were isolated from the fungus, and their structures were established by spectroscopic analysis. The biological activities of 1, 2, 3, 4, and 5 were examined by a bioassay with root-lesion nematodes.
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73
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Fokialakis N, Magiatis P, Mitaku S, Tillequin F, Sévenet T. Two new 3-methoxy-4-quinolone alkaloids from the bark of Sarcomelicope megistophylla. Chem Pharm Bull (Tokyo) 2000; 48:2009-10. [PMID: 11145161 DOI: 10.1248/cpb.48.2009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two new alkaloids, megistonine I (1) and megistonine II (2), were isolated from the bark of Sarcomelelicope megistophylla. Their structures, which are derived from the 3-methoxy-4-quinolone basic skeleton, were elucidated on the basis of MS and extensive NMR studies.
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74
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Kakinuma N, Iwai H, Takahashi S, Hamano K, Yanagisawa T, Nagai K, Tanaka K, Suzuki K, Kirikae F, Kirikae T, Nakagawa A. Quinolactacins A, B and C: novel quinolone compounds from Penicillium sp. EPF-6. I. Taxonomy, production, isolation and biological properties. J Antibiot (Tokyo) 2000; 53:1247-51. [PMID: 11213284 DOI: 10.7164/antibiotics.53.1247] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quinolactacins A (1), B (2) and C (3), novel quinolone antibiotics have been found from the cultured broth of a fungal strain isolated from the larvae of the mulberry pyralid Margaronia pyloalis Welker). The fungal strain, EPF-6 was identified as Penicillium sp. from its morphological characteristics. Quinolactacins were obtained from the culture medium by solvent extraction and chromatographic purification. Compound 1 showed inhibitory activity against tumor necrosis factor (TNF) production induced by murine peritoneal macrophages and macrophage-like J774.1 cells stimulated with lipopolysaccharide (LPS).
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75
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Ford J, Capon RJ. Discorhabdin R: a new antibacterial pyrroloiminoquinone from two latrunculiid marine sponges, Latrunculia sp. and Negombata sp. JOURNAL OF NATURAL PRODUCTS 2000; 63:1527-1528. [PMID: 11087598 DOI: 10.1021/np000220q] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Two sponges belonging to the family Latrunculiidae (Negombata and Latrunculia sp.) collected during scientific trawling operations in Prydz Bay, Antarctica, and by scuba off Port Campbell, Victoria, have yielded a new antibacterial pyrroloiminoquinone, discorhabdin R (2). The structure was assigned as 2 on the basis of detailed spectroscopic analysis and comparison with the known co-metabolite discorhabdin B (3).
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