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Armando Zarrelli - One of the best experts on this subject based on the ideXlab platform.
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Dimeric phenanthrenoids from Juncus acutus
Natural Product Research, 2005Co-Authors: Marina Dellagreca, Armando ZarrelliAbstract:Two new dimeric phenanthrenoids have been isolated by the methanol extract of rhizomes of Juncus acutus. The structures have been determined on the basis of their spectroscopic properties and by chemical correlation. The compounds showed in vitro phytotoxicity against Selenastrum capricornutum, a microalga used in aquatic tests.
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Bioactivity of phenanthrenes from Juncus acutus on Selenastrum capricornutum.
Journal of Chemical Ecology, 2004Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Margherita Lavorgna, Armando ZarrelliAbstract:Twenty-five 9,10-dihydrophenanthrenes, four phenanthrenes, a dihydrodibenzoxepin, and a pyrene, isolated from the wetland plant Juncus acutus, were tested to detect their effects on the green alga Selenastrum capricornutum. Nine of the compounds were isolated and identified for the first time. Most of the compounds caused inhibition of algal growth. The 9,10-dihydrophenanthrenes 1, 5, 21, and 22 were the most active.
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new dimeric phenanthrenoids from the rhizomes of juncus acutus structure determination and antialgal activity
Tetrahedron, 2003Co-Authors: Marina Dellagreca, Fabio Temussi, Armando ZarrelliAbstract:In a study of the allelochemical interactions between the wetland plant Juncus acutus and microalgae some dimeric dihydrophenanthrenoids have been isolated. The structures have been determined on the basis of their spectroscopic properties and their phytotoxicity was evaluated on Selenastrum capricornutum.
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phenanthrenoids from the wetland juncus acutus
Phytochemistry, 2002Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Antonio Fiorentino, Margherita Lavorgna, Armando ZarrelliAbstract:Abstract Nine 9,10-dihydrophenanthrenes, three phenanthrenes and a related pyrene have been isolated from the wetland plant Juncus acutus. The structures have been attributed by means of their spectral data and chemical correlation. 5-(1-Ethoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene and 5-(1-phytoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene, 2,7-dihydroxy-1-methyl-5-vinylphenanthrene, 2,7-dimethoxy-1,6-dimethyl-5-vinylphenanthrene and 2,7-dihydroxy-1,6-dimethylpyrene are described for the first time. Many of the compounds showed in vitro phytotoxicity against Selenastrum capricornutum, a microalga used in aquatic tests.
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phenanthrenoids from the wetland juncus acutus
Phytochemistry, 2002Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Margherita Lavorgna, Armando ZarrelliAbstract:Nine 9,10-dihydrophenanthrenes, three phenanthrenes and a related pyrene have been isolated from the wetland plant Juncus acutus. The structures have been attributed by means of their spectral data and chemical correlation. 5-(1-Ethoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene and 5-(1-phytoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene, 2,7-dihydroxy-1-methyl-5-vinylphenanthrene, 2,7-dimethoxy-1,6-dimethyl-5-vinylphenanthrene and 2,7-dihydroxy-1,6-dimethylpyrene are described for the first time. Many of the compounds showed in vitro phytotoxicity against Selenastrum capricornutum, a microalga used in aquatic tests.
Pietro Monaco - One of the best experts on this subject based on the ideXlab platform.
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chemical constituents of the aquatic plant schoenoplectus lacustris evaluation of phytotoxic effects on the green alga Selenastrum capricornutum
Journal of Chemical Ecology, 2006Co-Authors: Brigida Dabrosca, Marina Isidori, Pietro Monaco, Marina Dellagreca, Antonio Fiorentino, Severina PacificoAbstract:Forty-nine secondary metabolites were isolated from aqueous and alcoholic extracts of the aquatic plant Shoenoplectus lacustris. All compounds were characterized based on spectroscopic data. Eleven free and glycosylated low-molecular polyphenols, 17 cinnamic acid and dihydrocinnamic acid derivatives, 11 flavonoids, and 10 C13 nor-isoprenoids were identified. The structure of the new compound, 1-benzoyl-glycerol-2-α-l-arabinopyranoside, was elucidated by 2D NMR experiments (COSY, HSQC, HMBC, NOESY). To evaluate potential phytotoxic effects, all compounds were tested on the green alga Selenastrum capricornutum, a unicellular organism commonly used in tests of toxicity as a bioindicator of eutrophic sites. The most active compound was (−)-catechin, showing an inhibition similar to that of the algaecide CuSO4.
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Bioactivity of phenanthrenes from Juncus acutus on Selenastrum capricornutum.
Journal of Chemical Ecology, 2004Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Margherita Lavorgna, Armando ZarrelliAbstract:Twenty-five 9,10-dihydrophenanthrenes, four phenanthrenes, a dihydrodibenzoxepin, and a pyrene, isolated from the wetland plant Juncus acutus, were tested to detect their effects on the green alga Selenastrum capricornutum. Nine of the compounds were isolated and identified for the first time. Most of the compounds caused inhibition of algal growth. The 9,10-dihydrophenanthrenes 1, 5, 21, and 22 were the most active.
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phenanthrenoids from the wetland juncus acutus
Phytochemistry, 2002Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Antonio Fiorentino, Margherita Lavorgna, Armando ZarrelliAbstract:Abstract Nine 9,10-dihydrophenanthrenes, three phenanthrenes and a related pyrene have been isolated from the wetland plant Juncus acutus. The structures have been attributed by means of their spectral data and chemical correlation. 5-(1-Ethoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene and 5-(1-phytoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene, 2,7-dihydroxy-1-methyl-5-vinylphenanthrene, 2,7-dimethoxy-1,6-dimethyl-5-vinylphenanthrene and 2,7-dihydroxy-1,6-dimethylpyrene are described for the first time. Many of the compounds showed in vitro phytotoxicity against Selenastrum capricornutum, a microalga used in aquatic tests.
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phenanthrenoids from the wetland juncus acutus
Phytochemistry, 2002Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Margherita Lavorgna, Armando ZarrelliAbstract:Nine 9,10-dihydrophenanthrenes, three phenanthrenes and a related pyrene have been isolated from the wetland plant Juncus acutus. The structures have been attributed by means of their spectral data and chemical correlation. 5-(1-Ethoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene and 5-(1-phytoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene, 2,7-dihydroxy-1-methyl-5-vinylphenanthrene, 2,7-dimethoxy-1,6-dimethyl-5-vinylphenanthrene and 2,7-dihydroxy-1,6-dimethylpyrene are described for the first time. Many of the compounds showed in vitro phytotoxicity against Selenastrum capricornutum, a microalga used in aquatic tests.
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Effect of ent-Labdane Diterpenes from Potamogetonaceae on Selenastrum capricornutum and Other Aquatic Organisms
Journal of Chemical Ecology, 2002Co-Authors: Tiziana Cangiano, Marina Isidori, Pietro Monaco, Marina Dellagreca, Antonio Fiorentino, Armando ZarrelliAbstract:Twenty ent -labdane diterpenes, isolated from the aquatic plants Ruppia maritima and Potamogeton natans , were tested to detect their effects on aquatic organisms from different trophic levels. Toxicity tests were performed on aquatic producers (the alga Selenastrum capricornutum ), and consumers including a rotifer ( Brachionus calyciflorus ), a cladoceran crustacean ( Daphnia magna ), and two anostracan crustaceans ( Thamnocephalus platyurus and Artemia salina ). Furano- ent -labdanes exhibited high toxicity toward all of these organisms. 15,16-Epoxy-12( S )-hydroxy-8(17),13(16),14- ent -labdatrien-20,19-olide had a high toxicity only toward the algae and the rotifers. It was inactive for the crustaceans.
Marina Dellagreca - One of the best experts on this subject based on the ideXlab platform.
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algicide constituents from swinglea glutinosa
Journal of Agricultural and Food Chemistry, 2009Co-Authors: Raffaella Purcaro, Marina Dellagreca, Kevin K Schrader, Charles L Burandt, Kumudini M MeepagalaAbstract:Oscillatoria perornata, a cyanobacterium (blue-green alga), common in catfish production ponds in the southeastern United States, produces the monoterpene 2-methylisoborneol (MIB), which is absorbed into catfish flesh and imparts a "musty" taste, rendering them unpalatable and unmarketable. Algicides that are currently in the commercial market to control O. perornata have broad-spectrum toxicity toward other beneficial phytoplankton, such as the green alga Selenastrum capricornutum, as well as low biodegradability. As part of our continuing efforts to search for natural-product-based algicides, the ethyl acetate extract of the roots of Swinglea glutinosa was investigated. This report describes isolation and structure elucidation of one novel coumarin, two known coumarins, and nine acridone alkaloids from S. glutinosa root extracts and the evaluation of these compounds for algicidal activity against O. perornata.
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chemical constituents of the aquatic plant schoenoplectus lacustris evaluation of phytotoxic effects on the green alga Selenastrum capricornutum
Journal of Chemical Ecology, 2006Co-Authors: Brigida Dabrosca, Marina Isidori, Pietro Monaco, Marina Dellagreca, Antonio Fiorentino, Severina PacificoAbstract:Forty-nine secondary metabolites were isolated from aqueous and alcoholic extracts of the aquatic plant Shoenoplectus lacustris. All compounds were characterized based on spectroscopic data. Eleven free and glycosylated low-molecular polyphenols, 17 cinnamic acid and dihydrocinnamic acid derivatives, 11 flavonoids, and 10 C13 nor-isoprenoids were identified. The structure of the new compound, 1-benzoyl-glycerol-2-α-l-arabinopyranoside, was elucidated by 2D NMR experiments (COSY, HSQC, HMBC, NOESY). To evaluate potential phytotoxic effects, all compounds were tested on the green alga Selenastrum capricornutum, a unicellular organism commonly used in tests of toxicity as a bioindicator of eutrophic sites. The most active compound was (−)-catechin, showing an inhibition similar to that of the algaecide CuSO4.
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Dimeric phenanthrenoids from Juncus acutus
Natural Product Research, 2005Co-Authors: Marina Dellagreca, Armando ZarrelliAbstract:Two new dimeric phenanthrenoids have been isolated by the methanol extract of rhizomes of Juncus acutus. The structures have been determined on the basis of their spectroscopic properties and by chemical correlation. The compounds showed in vitro phytotoxicity against Selenastrum capricornutum, a microalga used in aquatic tests.
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Bioactivity of phenanthrenes from Juncus acutus on Selenastrum capricornutum.
Journal of Chemical Ecology, 2004Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Margherita Lavorgna, Armando ZarrelliAbstract:Twenty-five 9,10-dihydrophenanthrenes, four phenanthrenes, a dihydrodibenzoxepin, and a pyrene, isolated from the wetland plant Juncus acutus, were tested to detect their effects on the green alga Selenastrum capricornutum. Nine of the compounds were isolated and identified for the first time. Most of the compounds caused inhibition of algal growth. The 9,10-dihydrophenanthrenes 1, 5, 21, and 22 were the most active.
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new dimeric phenanthrenoids from the rhizomes of juncus acutus structure determination and antialgal activity
Tetrahedron, 2003Co-Authors: Marina Dellagreca, Fabio Temussi, Armando ZarrelliAbstract:In a study of the allelochemical interactions between the wetland plant Juncus acutus and microalgae some dimeric dihydrophenanthrenoids have been isolated. The structures have been determined on the basis of their spectroscopic properties and their phytotoxicity was evaluated on Selenastrum capricornutum.
Tityee Wong - One of the best experts on this subject based on the ideXlab platform.
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promutagen activation by the green alga Selenastrum capricornutum
Environmental Toxicology and Chemistry, 1998Co-Authors: K R Sauser, Kingthom Chung, Tityee WongAbstract:The capability of Selenastrum capricornutum to activate o-phenylenediamine (OPD) and 2-aminofluorene (2-AF) was tested in a modified Ames assay in which the activation component (S9) was replaced by the algal cells. Normal-grown algae did not activate OPD but these cells activated 2-AF by sixfold. Copper induces a peroxidase in S. capricornutum. Algae pregrown on copper-enriched medium increased the mutagenicity of OPD by more than 16-fold, but these cells failed to further activate 2-AF. However, 2-AF was further activated by algae pretreated with flavone, Aroclor, 5,6-naphthoflavone, or 2,4-dichlorophenoxyacetic acid, but not lindane or ethanol. This suggested that a cytochrome P450 system was involved in 2-AF activation. Coincubating algae with cytochrome P450 inhibitors including diethyldithiocarbamate, methimizole, or acetaminophen, but not catechin, 7–8-naphthoflavone, or CuCl2 reduced the activation level of 2-AF significantly.
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identification of a copper sensitive ascorbate peroxidase in the unicellular green alga Selenastrum capricornutum
Biometals, 1997Co-Authors: K R Sauser, J K Liu, Tityee WongAbstract:Extracts from the unicellular green alga Selenastrum capricornutum exhibit high superoxide dismutase activity, but only traces of catalase activity. The excess hydrogen peroxide (H2O2) generated by the superoxide dismutase in S. capricornutum may be degraded by a unique peroxidase. This peroxidase has a high specificity for ascorbate as its electron donor. The enzyme has an optimum pH at 8, is insensitive to cyanide and is inhibited by oxine. Addition of low concentrations of copper to algal cultures stimulates the peroxidase activity threefold. This enzymatic system could be used as a sensitive bioindicator for copper in fresh water.
Antonio Fiorentino - One of the best experts on this subject based on the ideXlab platform.
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chemical constituents of the aquatic plant schoenoplectus lacustris evaluation of phytotoxic effects on the green alga Selenastrum capricornutum
Journal of Chemical Ecology, 2006Co-Authors: Brigida Dabrosca, Marina Isidori, Pietro Monaco, Marina Dellagreca, Antonio Fiorentino, Severina PacificoAbstract:Forty-nine secondary metabolites were isolated from aqueous and alcoholic extracts of the aquatic plant Shoenoplectus lacustris. All compounds were characterized based on spectroscopic data. Eleven free and glycosylated low-molecular polyphenols, 17 cinnamic acid and dihydrocinnamic acid derivatives, 11 flavonoids, and 10 C13 nor-isoprenoids were identified. The structure of the new compound, 1-benzoyl-glycerol-2-α-l-arabinopyranoside, was elucidated by 2D NMR experiments (COSY, HSQC, HMBC, NOESY). To evaluate potential phytotoxic effects, all compounds were tested on the green alga Selenastrum capricornutum, a unicellular organism commonly used in tests of toxicity as a bioindicator of eutrophic sites. The most active compound was (−)-catechin, showing an inhibition similar to that of the algaecide CuSO4.
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phenanthrenoids from the wetland juncus acutus
Phytochemistry, 2002Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Lucio Previtera, Antonio Fiorentino, Margherita Lavorgna, Armando ZarrelliAbstract:Abstract Nine 9,10-dihydrophenanthrenes, three phenanthrenes and a related pyrene have been isolated from the wetland plant Juncus acutus. The structures have been attributed by means of their spectral data and chemical correlation. 5-(1-Ethoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene and 5-(1-phytoxy-ethyl)-2-hydroxy-7-methoxy-1,8-dimethyl-9,10-dihydrophenanthrene, 2,7-dihydroxy-1-methyl-5-vinylphenanthrene, 2,7-dimethoxy-1,6-dimethyl-5-vinylphenanthrene and 2,7-dihydroxy-1,6-dimethylpyrene are described for the first time. Many of the compounds showed in vitro phytotoxicity against Selenastrum capricornutum, a microalga used in aquatic tests.
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Effect of ent-Labdane Diterpenes from Potamogetonaceae on Selenastrum capricornutum and Other Aquatic Organisms
Journal of Chemical Ecology, 2002Co-Authors: Tiziana Cangiano, Marina Isidori, Pietro Monaco, Marina Dellagreca, Antonio Fiorentino, Armando ZarrelliAbstract:Twenty ent -labdane diterpenes, isolated from the aquatic plants Ruppia maritima and Potamogeton natans , were tested to detect their effects on aquatic organisms from different trophic levels. Toxicity tests were performed on aquatic producers (the alga Selenastrum capricornutum ), and consumers including a rotifer ( Brachionus calyciflorus ), a cladoceran crustacean ( Daphnia magna ), and two anostracan crustaceans ( Thamnocephalus platyurus and Artemia salina ). Furano- ent -labdanes exhibited high toxicity toward all of these organisms. 15,16-Epoxy-12( S )-hydroxy-8(17),13(16),14- ent -labdatrien-20,19-olide had a high toxicity only toward the algae and the rotifers. It was inactive for the crustaceans.
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dihydrophenanthrene and phenanthrene mimics of natural compounds synthesis and antialgal activity
Journal of Chemical Ecology, 2000Co-Authors: Marina Dellagreca, Pietro Monaco, Lucio Previtera, Antonio Fiorentino, Antonino Pollio, Armando ZarrelliAbstract:9,10-Dihydrophenanthrenes and phenanthrenes, mimics of natural compounds with strong antialgal activity, have been synthesized through cross-coupling of 1-(2-iodo-5-methoxy)-phenylethanol with variously substituted iodobenzenes. The synthetic compounds, bearing a hydroxyl or a methoxyl group at C-2 and a methyl in the C ring, were tested against the green alga Selenastrum capricornutum. All compounds, except 2-methoxy-7-methylphenanthrene, caused inhibition of algal growth by more than 70% at 10−4 M, and many of them retained this strong activity at 10−5 M.
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Antialgal ent-labdane diterpenes from Ruppia maritima.
Phytochemistry, 2000Co-Authors: Marina Dellagreca, Marina Isidori, Pietro Monaco, Antonio Fiorentino, Armando ZarrelliAbstract:Seven ent-labdane diterpenes have been isolated from Ruppia maritima. The structures 15,16-epoxy-ent-labda-8(17),13(16),14-trien-19-al; 15,16-epoxy-ent-labda-8(17),13(16),14-trien-19-ol acetate; methyl 15,16-epoxy-12-oxo-ent-labda-8(17),13(16),14-trien-19-oate; 15,16-epoxy-ent-labd-8(17),13E-dien-15-ol and 13-oxo-15,16-bis-nor-ent-labd-8(17)-ene have been assigned to the five new compounds by spectroscopic means and chemical correlations. The phytotoxicity of the diterpenes has been assessed using the alga Selenastrum capricornutum as organism test.
