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Journal articles on the topic 'Halogenated compound'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Gao, Peng, and Ying Huang. "Detection, Distribution, and Organohalogen Compound Discovery Implications of the Reduced Flavin Adenine Dinucleotide-Dependent Halogenase Gene in Major Filamentous Actinomycete Taxonomic Groups." Applied and Environmental Microbiology 75, no. 14 (2009): 4813–20. http://dx.doi.org/10.1128/aem.02958-08.

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ABSTRACT Halogenases have been shown to play a significant role in biosynthesis and introducing the bioactivity of many halogenated secondary metabolites. In this study, 54 reduced flavin adenine dinucleotide (FADH2)-dependent halogenase gene-positive strains were identified after the PCR screening of a large collection of 228 reference strains encompassing all major families and genera of filamentous actinomycetes. The wide distribution of this gene was observed to extend to some rare lineages with higher occurrences and large sequence diversity. Subsequent phylogenetic analyses revealed that

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2

Zakary, sefatullah, Habeebat Oyewusi, and Fahrul Huyop. "Dehalogenases for pollutant degradation in brief: A mini review." Journal of Tropical Life Science 11, no. 1 (2021): 17–24. http://dx.doi.org/10.11594/jtls.11.01.03.

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Dehalogenases are microbial enzyme catalysed the cleavage of carbon-halogen bond of halogenated organic compounds. It has potential use in the area of biotechnology such as bioremediation and chemical industry. Halogenated organic compounds can be found in a considerable amount in the environment due to utilization in agriculture and industry, such as pesticides and herbicides. The presence of halogenated compound in the environment have been implicated on the health and natural ecosystem. Microbial dehalogenation is a significant method to tackle this problem. This review intends to briefly d

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3

Gedye, Richard Neville, Yoginder Nath Sadana, and Raymond Leger. "The electroreduction of halogenated thiophenes." Canadian Journal of Chemistry 63, no. 10 (1985): 2669–72. http://dx.doi.org/10.1139/v85-443.

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Electroreduction of polyhalothiophenes results in the preferential reduction of the α-halogen atoms. Preparative electrochemical reduction of these compounds at controlled potential can be used to synthesize 2,3,4-trihalo, 3,4-dihalo, and 3-halothiophenes. Experimental conditions were developed under which these reductions could be done selectively, giving good yields of the desired products. Electroreduction of tetrabromothiophene can also lead to the formation of a poly-bromodithienyl mercury compound.

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4

Sithole, Bishop B., and David T. Williams. "Halogenated Phenols in Water at Forty Canadian Potable Water Treatment Facilities." Journal of AOAC INTERNATIONAL 69, no. 5 (1986): 807–10. http://dx.doi.org/10.1093/jaoac/69.5.807.

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Abstract Samples of raw and treated water were collected once in each of 3 seasons at 40 potable water treatment plants across Canada and were analyzed for phenol and 33 halogenated phenolic compounds including chlorophenols, bromophenols, bromochlorophenols, and chloroguaiacols. Eighteen of the compounds were not found at any treatment plant; phenol and each of the remaining halogenated phenols were found in at least 1 sample. Pentachlorophenol was the only halogenated phenolic compound found in more than 20% of the raw water samples in the fall and winter samples at levels up to 53 ng/L with

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5

Ninga, Ederina, Elvira Beli, Elona Shahu, and Ilirjana Boci. "Analysis of Halogenated Compounds in Fish Samples." European Journal of Engineering Research and Science 4, no. 2 (2019): 37–39. http://dx.doi.org/10.24018/ejers.2019.4.2.1099.

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The paper reports investigation on the presence of 13 halogenated compounds (six chlorinated compounds, nd-like PCBs and seven brominated compounds, polybrominated diphenyl ethers (PBDEs)), in five marine species which are part on Albanian consumer diet. The samples were extracted with ethyl acetate and treated with sulfuric acid. Extract was analyzed simultaneously using gas chromatography tandem mass spectrometry. Presence of PCBs was confirmed at1.4 percent of the samples. The most dominated congener found to be present were PCB 153 and PCB 138. Form the brominated compounds 2,2′,4,4′-tetra

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6

Moqadam, Samira, and Mehdi Salami-Kalajahi. "Halogenated sunflower oil as a precursor for synthesis of polysulfide polymer." e-Polymers 16, no. 1 (2016): 33–39. http://dx.doi.org/10.1515/epoly-2015-0152.

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AbstractPolysulfide polymers usually are prepared by the reaction of different dihalide compounds with disodium polysulfides. In this field, dihalides are expensive and produced from halogenation of organic compounds by different methods with harsh conditions. To overcome this problem, in this work, sunflower oil as polyunsaturated oil was used as precursor to produce polyhalide compound. In this field, double bonds of oil were applied as functional groups to halogenate the sunflower via benzoyl peroxide-catalyzed reaction with hydrochloric acid. Also, Na2S3 was synthesized via the reaction be

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7

Shiyanga, Aina N., Michael Knott, and Petrina Kapewangolo. "In vitro Anti-HIV and Antimicrobial Activities of a Halogenated Monoterpene from a Namibian Plocamium Species of Marine Algae." Current Bioactive Compounds 16, no. 3 (2020): 363–67. http://dx.doi.org/10.2174/1573407215666190111153845.

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Background: The marine red alga Plocamium naturally produces halogenated monoterpenes with varied biological activities. In our continuing efforts to discover new lead compounds for the treatment of HIV/AIDS as well as novel antibacterial compounds, various Namibian Plocamium species have been investigated. Methods: A rare but known compound namely 1E,3R,4S,5E,7Z-1-bromo-3,4,8-trichloro-7- (dichloromethyl)-3-methylocta-1,5,7-triene (1) was isolated from a Namibian Plocamium red alga. The anti-HIV activity of compound 1 was investigated against three HIV enzymes namely, HIV protease, reverse tr

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8

Tanase, Constantin I., Lucia Pintilie та Elena Mihai. "A Molecular Docking of New 9β-Halogenated Prostaglandin Analogs with an Ester Group at C-6 Atom of the α-Side Chain". Revista de Chimie 71, № 4 (2020): 101–10. http://dx.doi.org/10.37358/rc.20.4.8048.

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Prostaglandins with cytoprotective activity were studied for a long time and a few PGE1 and PGE2 stable analogs were promoted as drugs: arbaprostil, enprostil, misoprostol and rioptostol. Nocloprost, a 9β-chlorine prostaglandin analog, has been also promoted as a cytoprotective drug; the succes with this compound stimulated the reserches, and many 9β- or 11β-substituted prostaglandins were synthesized and studied for their biological activity. In the same dirrection we previously synthesized new 9β-halogenated prostaglandins having also an ester group at the carbon atom 6. These compounds were

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9

den Besten, C., A. Brouwer, I. M. C. M. Rietjens, and P. J. van Bladeren. "Biotransfiormation and Toxicity of Halogenated Benzenes." Human & Experimental Toxicology 13, no. 12 (1994): 866–75. http://dx.doi.org/10.1177/096032719401301209.

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1 Multiple potentially harmful metabolites can be distinguished in the metabolic activation of halogenated benzenes: epoxides, phenols, benzoquinones and benzoquinone-derived glutathione conjugates. 2 The role of these (re-) active metabolites in the toxic effects induced by halogenated benzenes such as hepatotoxicity, nephrotoxicity, porphyria and thyroid toxicity is discussed. 3 Evidence is presented suggesting that the formation of reactive benzoquinone metabolites rather than the traditional epoxides is linked to halogenated benzene-induced hepatotoxicity. 4 A crucial role for the benzoqui

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10

Wang, Guangli, Rong Li, Shunpeng Li, and Jiandong Jiang. "A Novel Hydrolytic Dehalogenase for the Chlorinated Aromatic Compound Chlorothalonil." Journal of Bacteriology 192, no. 11 (2010): 2737–45. http://dx.doi.org/10.1128/jb.01547-09.

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ABSTRACT Dehalogenases play key roles in the detoxification of halogenated aromatics. Interestingly, only one hydrolytic dehalogenase for halogenated aromatics, 4-chlorobenzoyl-coenzyme A (CoA) dehalogenase, has been reported. Here, we characterize another novel hydrolytic dehalogenase for a halogenated aromatic compound from the 2,4,5,6-tetrachloroisophthalonitrile (chlorothalonil)-degrading strain of Pseudomonas sp. CTN-3, which we have named Chd. Chd catalyzes a hydroxyl substitution at the 4-chlorine atom of chlorothalonil. The metabolite of the Chd dehalogenation, 4-hydroxy-trichloroisoph

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11

Inés, Concepcián de, Victor H. Argandoña, Juana Rovirosa, et al. "Cytotoxic Activity of Halogenated Monoterpenes from Plocamium cartilagineum." Zeitschrift für Naturforschung C 59, no. 5-6 (2004): 339–44. http://dx.doi.org/10.1515/znc-2004-5-609.

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Nine halogenated monoterpenes isolated from the red alga Plocamium cartilagineum have been evaluated for their cytotoxic effects on the tumor cell lines CT26 (murine colon adenocarcinoma), SW480 (human colon adenocarcinoma), HeLa (human cervical adenocarcinoma) and SkMel28 (human malignant melanoma) with several multidrug resistance mechanisms and the mammalian non-tumor cell line CHO (Chinese hamster ovary cells). The activities of these compounds were compared with those of the insecticide γ-hexachlorocyclohexane (lindane) due to chemical structure similarities. Compounds 1, 2, 3, and 5 exhi

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12

D'AQUINO, MIGUEL, PILAR SANTINI, and HUMBERTO MUZIO. "Action of Halogenated Compounds on Aspergillus Conidiospores." Journal of Food Protection 49, no. 7 (1986): 537–40. http://dx.doi.org/10.4315/0362-028x-49.7.537.

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The fungicidal activity of two halogenated compounds against conidiospores of four Aspergillus strains (A. flavus and A. sydowi isolated from a poultry farm, A. parasiticus NRRL 2999 and A. niger 29-CCM-A 41) was studied. Accordingly, the sodium salt of a synthetic organic compound derived from trichloroisocyanuric acid and an organic complex of iodine (iodophor) were used at 20°C at their recommended dilution (0.1%). More than 99.9% of the exposed spore population of all strains was inactivated within 30 min of contact with either product. During the first minute of contact, the iodophor solu

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13

Ojeda, Ann Sullivan, Elizabeth Phillips, and Barbara Sherwood Lollar. "Multi-element (C, H, Cl, Br) stable isotope fractionation as a tool to investigate transformation processes for halogenated hydrocarbons." Environmental Science: Processes & Impacts 22, no. 3 (2020): 567–82. http://dx.doi.org/10.1039/c9em00498j.

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14

Gullickson, Glen C., and David E. Lewis. "Reactions of Active Methylene Compounds with Benzhydrol During Solvolysis in Formic Acid." Australian Journal of Chemistry 56, no. 5 (2003): 385. http://dx.doi.org/10.1071/ch02157.

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Formic acid reacts with benzhydrol to give benzhydryl formate, which reacts with active methylene compounds in refluxing formic acid to give either C-alkylation or Ritter reaction products. The product formed is determined by the equilibrium enol content of the active methylene compound. These reaction conditions avoid the use of halogenated reaction solvents, and the pure products are isolated without recourse to chromatography.

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15

Zahran, Faten, Akaber T. Keshta, and Abd El-Shafey I. Ahmed. "In vivo Anti-Cancer Activity of N-halamines." International Journal of Biology 9, no. 1 (2016): 20. http://dx.doi.org/10.5539/ijb.v9n1p20.

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Purpose: N-halamines were known for their antimicrobial action due to the presence of halogen in their structure. In our search for new anti-cancer agents, we have evaluated the anti-cancer and anti-oxidant properties of some synthetic N-Halamines with high and low molecular weight in comparison with their non-halogenated forms. Urea epichlorohydrin copolymer (1), 4(1H, 3H-2, 6-dioxo-1, 3, 5-trizenyl)-O-iminomethylpolyethylene (3) and cynuric acid (5) in addition to their halogenated forms 2, 4 and 6 were selected for this study. Methodology: the toxicity for the synthesized compounds was dete

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16

Johnson, Timothy L., Michelle M. Scherer, and Paul G. Tratnyek. "Kinetics of Halogenated Organic Compound Degradation by Iron Metal." Environmental Science & Technology 30, no. 8 (1996): 2634–40. http://dx.doi.org/10.1021/es9600901.

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17

Li, Yanran, Sijin Li, Kate Thodey, Isis Trenchard, Aaron Cravens, and Christina D. Smolke. "Complete biosynthesis of noscapine and halogenated alkaloids in yeast." Proceedings of the National Academy of Sciences 115, no. 17 (2018): E3922—E3931. http://dx.doi.org/10.1073/pnas.1721469115.

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Microbial biosynthesis of plant natural products from simple building blocks is a promising approach toward scalable production and modification of high-value compounds. The pathway for biosynthesis of noscapine, a potential anticancer compound, from canadine was recently elucidated as a 10-gene cluster from opium poppy. Here we demonstrate the de novo production of noscapine in Saccharomyces cerevisiae, through the reconstruction of a biosynthetic pathway comprising over 30 enzymes from plants, bacteria, mammals, and yeast itself, including 7 plant endoplasmic reticulum (ER)-localized enzymes

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18

Petzinger, Glenn, Thomas L. Barry, John A. G. Roach, Steven M. Musser, and James Sphon. "Gas Chromatographic/Mass Spectrometric Analyses of Unknown Analytical Response in Imported Fava Beans: 4-Chloro-6-methoxyindole." Journal of AOAC INTERNATIONAL 78, no. 3 (1995): 888–92. http://dx.doi.org/10.1093/jaoac/78.3.888.

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Abstract A halogenated unidentified analytical response (UAR) was encountered in a number of imported Fava bean samples during the Food and Drug Administration’s routine pesticide-monitoring program. Gas chromatographic/mass spectrometric (GC/MS) analyses identified the halogenated component as 4-chloro-6-methoxyindole, a naturally occurring promutagen in Fava beans that has been linked to incidents of gastric cancer. Data from electron impact, positive and negative chemical ionization, collision-induced dissociation, and deuteration studies of this compound are presented, along with GC retent

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19

Zaki, Dr Remon M., Prof Adel M. Kamal El-Dean, Dr Nermin A. Marzouk, Prof Jehan A. Micky, and Mrs Rasha H. Ahmed. "A FACILE SYNTHESIS AND REACTIONS OF AMINO SELENOLO[2,3-b]PYRIDINE CARBOXYLATE." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 1 (2015): 3910–18. http://dx.doi.org/10.24297/jac.v12i1.845.

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Incorporating selenium metal bonded to the pyridine nucleus was achieved by the reaction of selenium metal with 2-chloropyridine carbonitrile 1 in the presence of sodium borohydride as reducing agent. The resulting non isolated selanyl sodium salt was subjected to react with various α-halogenated carbonyl compounds to afford the selenyl pyridine derivatives 3a-f which compounds 3a-d underwent Thorpe-Ziegler cyclization to give 1-amino-2-substitutedselenolo[2,3-b]pyridine compounds 4a-d, while the other compounds 3e,f failed to be cyclized. Basic hydrolysis of amino selenolo[2,3-b]pyridine carb

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20

Ghamsari, Parnia Abyar, Marjaneh Samadizadeh, and Mahmoud Mirzaei. "Halogenated derivatives of cytidine: Structural analysis and binding affinity." Journal of Theoretical and Computational Chemistry 19, no. 08 (2020): 2050033. http://dx.doi.org/10.1142/s0219633620500339.

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Cytidine is a well-known inhibitor of DNA methyltransferase (MTN) enzyme for preventing cancer cells growth. Based on therapeutic benefits, it could be considered as a “lead compound” to be optimized through structural modification for arising better binding affinity in this case. Halogenated derivatives of cytidine were investigated in this work to examine structural and biological features employing in silico approach. To this aim, geometries of the original cytidine and four of its halogenated derivatives were minimized to prepare ligands for interacting with MTN enzyme target in molecular

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21

Arnaud, R., S. Choubani, R. Subra, M. Vidal, M. Vincens, and V. Barone. "Le radical méthylènecyclopropyle: étude théorique. Chloration par t-BuOCl et réduction par (nBu)3SnH de dérivés cyclopropéniques." Canadian Journal of Chemistry 63, no. 9 (1985): 2511–21. http://dx.doi.org/10.1139/v85-416.

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The allylic chlorination of ethyl 2,3-dialkyl 2-cyclopropenecarboxylate or primary and tertiary alcohols is highly regio- and stereoselective. The halogenated methylenecyclopropane derivative only is observed. In that compound, the halogen substituent and the functional group are in a trans position with respect to the ring. The halogenated allylic compounds of methylenecyclopropane and of cyclopropene undergo reduction by (nBu)3SnH with the same stereochemistry. Products arising from ring opening are also observed. The exocyclic migration of the double bond can be related to the formation of

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22

Di Filippo, Ester Sara, Letizia Giampietro, Barbara De Filippis, et al. "Synthesis and Biological Evaluation of Halogenated E-Stilbenols as Promising Antiaging Agents." Molecules 25, no. 23 (2020): 5770. http://dx.doi.org/10.3390/molecules25235770.

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The increased risk of illness and disability is related to the age inevitable biological changes. Oxidative stress is a proposed mechanism for many age-related diseases. The crucial importance of polyphenol pharmacophore for aging process is largely described thanks to its effects on concentrations of reactive oxygen species. Resveratrol (3,5,4′-trihydroxy-trans-stilbene, RSV) plays a critical role in slowing the aging process but has a poor bioavailabity after oral intake. In this present work, a series of RSV derivatives was designed, synthesized, and evaluated as potential antioxidant agent

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23

Reddy, Christopher M., Li Xu, Gregory W. O'Neil, et al. "Radiocarbon Evidence for a Naturally Produced, Bioaccumulating Halogenated Organic Compound." Environmental Science & Technology 38, no. 7 (2004): 1992–97. http://dx.doi.org/10.1021/es030568i.

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24

Suzuki, Minoru, Yasuhiro Mizuno, Yoshihide Matsuo, and Michio Masuda. "Neoisoprelaurefucin, a halogenated C15 non-terpenoid compound from Laurencia nipponica." Phytochemistry 43, no. 1 (1996): 121–24. http://dx.doi.org/10.1016/0031-9422(96)00237-3.

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25

Akkipeddi, S. M. K., M. Xu, and K. Y. K. Chan. "Halogenated compound secreted by marine bacteria halts larval urchin development." Journal of Experimental Marine Biology and Ecology 538 (May 2021): 151540. http://dx.doi.org/10.1016/j.jembe.2021.151540.

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26

Bano, Shaheen, Mohammad Shaiq Ali, and Viqar Uddin Ahmad. "Marine Natural Products, IX A New Halogenated Sesquiterpene Pinnatifidone from the Red Alga Laurencia pinnatifida." Zeitschrift für Naturforschung B 43, no. 10 (1988): 1347–50. http://dx.doi.org/10.1515/znb-1988-1022.

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Abstract From the ethyl acetate fraction of methanolic extract of red alga, L.pinnatifida, a new halogenated sesquiterpene named as pinnatifidone [1] has been isolated and the structure of this compound has been elucidated with the help of intensive spectroscopic studies.

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27

Buchta, Vladimír, Milan Pour, Petra Kubanová, et al. "In Vitro Activities of 3-(Halogenated Phenyl)-5-Acyloxymethyl- 2,5-Dihydrofuran-2-ones against Common and Emerging Yeasts and Molds." Antimicrobial Agents and Chemotherapy 48, no. 3 (2004): 873–78. http://dx.doi.org/10.1128/aac.48.3.873-878.2004.

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ABSTRACT Three 3-(halogenated phenyl)-5-acyloxymethyl-2,5-dihydrofuran-2-ones were evaluated for activity against 191 strains of common and emerging yeasts and Aspergillus species by the broth microdilution test performed according to NCCLS guidelines. The furanone derivatives displayed broad-spectrum in vitro activity against potentially pathogenic yeasts and molds, especially Aspergillus spp. (MIC ≤ 2.0 μg/ml) and fluconazole-resistant yeast isolates, including Candida glabrata and Saccharomyces cerevisiae. The 4-bromophenyl derivative was the most effective derivative against the majority o

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28

SUZUKI, M., Y. MIZUNO, Y. MATSUO, and M. MASUDA. "ChemInform Abstract: Neoisoprelaurefucin, a Halogenated C15 Nonterpenoid Compound from Laurencia Nipponica." ChemInform 27, no. 48 (2010): no. http://dx.doi.org/10.1002/chin.199648252.

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29

Seela, Frank, Simone Budow, Kuiying Xu, Xioahua Peng, and Henning Eickmeier. "7-Halogenated 7-deazapurine 2′-C-methylribonucleosides." Collection of Czechoslovak Chemical Communications 76, no. 12 (2011): 1413–31. http://dx.doi.org/10.1135/cccc2011124.

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7-Halogenated 7-deazapurine 2′-C-methylribonucleosides related to adenosine, inosine and guanosine were synthesized employing a “one-pot” glycosylation protocol (Vorbrüggen glycosylation). The immunosine 2′-C-methylribonucleoside 4 was prepared by the same glycosylation strategy. By this route, the synthesis of the anti-HCV active compound 7-fluoro-7-deaza-2′-C-methyladenosine (1b) was notably simplified, while other nucleosides were synthesized for the first time. A single-crystal X-ray analysis of 7-fluoro-7-deaza-2′-C-methylinosine (2b) was performed showing that the glycosylic bond adopts

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30

Lai, Ellen C. K., Donald Mackay, Nicholas J. Taylor, and Kenneth N. Watson. "Structure and reactivity in highly halogenated ketazines." Canadian Journal of Chemistry 66, no. 11 (1988): 2839–48. http://dx.doi.org/10.1139/v88-440.

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The azines of acetophenone and its mono- and di-chlorinated derivatives show a bathochronic shift in the yellow region, but the azine of trichloroacetophenone is colorless. Similar trends are observed in the brominated analogs and in the chlorinated propiophenone azines. The colorless tétrachloropropiophénone azine (13) is shown by X-ray analysis to be nonplanar at the azine atoms (N—N torsion angle, 126.7°). Hexachloroacetophenone azine (9) undergoes displacement of all its chlorines with NaOMe to give the hexamethoxy compound 16, also colorless. With acid, 16 gives the yellow planar (X-ray)

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Auer, Nicole R., and Detlef E. Schulz-Bull. "Stable Carbon Isotope Analysis of Anthropogenic Volatile Halogenated C1 and C2 Organic Compounds." Environmental Chemistry 3, no. 4 (2006): 268. http://dx.doi.org/10.1071/en06027.

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Environmental Context.Volatile halogenated organic compounds (VHOCs), ubiquitous trace gases of natural or man-made origin, have gained increasing attention due to their adverse health effects on humans and wildlife, and their potential for catalytic ozone destruction. However, it is difficult to confront VHOC emission budgets as the processes responsible for the formation and degradation of these compounds are complex, and their emission and persistence are affected by variations in the environment and climate. In order to understand VHOCs and reduce their environmental impact, it is necessar

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Bernini, Roberta, Marcella Pasqualetti, Gianfranco Provenzano, and Sabrina Tempesta. "Ecofriendly synthesis of halogenated flavonoids and evaluation of their antifungal activity." New Journal of Chemistry 39, no. 4 (2015): 2980–87. http://dx.doi.org/10.1039/c5nj00258c.

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33

Lebel, Guy L., and David T. Williams. "Determination of Halogenated Contaminants in Human Adipose Tissue." Journal of AOAC INTERNATIONAL 69, no. 3 (1986): 451–58. http://dx.doi.org/10.1093/jaoac/69.3.451.

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Abstract &lt;A method has been developed for determination of organochlorine contaminants in human adipose tissue. After fat extraction from the tissue with acetone-hexane (15 + 85, v/v), organochlorines were fractionated from fat by gel permeation chromatography with methylene chloride-cyclohexane (1 + 1, v/v) as solvent. After Florisil column cleanup, the GPC extract was analyzed by capillary column gas chromatography using 2 columns of different polarity. Compound identity was confirmed by gas chromatography-mass spectrometry using selected ion monitoring. Recoveries for fortification l

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34

Vorkamp, Katrin, Jan H. Christensen, Marianne Glasius, and Frank F. Riget. "Persistent halogenated compounds in black guillemots (Cepphus grylle) from Greenland––levels, compound patterns and spatial trends." Marine Pollution Bulletin 48, no. 1-2 (2004): 111–21. http://dx.doi.org/10.1016/s0025-326x(03)00369-2.

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35

Heidarrezaei, Mahshid, Hoofar Shokravi, Fahrul Huyop, Seyed Saeid Rahimian Koloor, and Michal Petrů. "Isolation and Characterization of a Novel Bacterium from the Marine Environment for Trichloroacetic Acid Bioremediation." Applied Sciences 10, no. 13 (2020): 4593. http://dx.doi.org/10.3390/app10134593.

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Halogenated compounds are an important class of environmental pollutants that are widely used in industrial chemicals such as solvents, herbicides, and pesticides. Many studies have been carried out to explore the biodegradation of these chemicals. Trichloroacetic acid (TCA) is one of the main halogenated compounds that are carcinogenic to humans and animals. The bacterium was isolated from the northern coastline of Johor Strait. In this study, the ability of strain MH2 to biodegrade TCA was evaluated by a growth experiment and dehalogenase enzyme assay. The growth profile of the isolated stra

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36

Faez, Sanli, Nico R. Verhart, Marios Markoulides, Francesco Buda, André Gourdon, and Michel Orrit. "Design and synthesis of aromatic molecules for probing electric fields at the nanoscale." Faraday Discussions 184 (2015): 251–62. http://dx.doi.org/10.1039/c5fd00065c.

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We propose using halogenated organic dyes as nanoprobes for electric fields and show their greatly enhanced Stark coefficients using density functional theory (DFT) calculations. We analyse halogenated variants of three molecules that have been of interest for cryogenic single molecule spectroscopy: perylene, terrylene, and dibenzoterrylene, with the zero-phonon optical transitions at blue, red, and near-infrared. Out of all the combinations of halides and binding sites that are calculated, we have found that fluorination of the optimum binding site induces a dipole difference between the grou

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van Beerendonk, G. J. M., S. D. Nelson, and J. H. N. Meerman. "Metabolism and Genotoxicity of the Halogenated Alkyl Compound Tris(2,3-Dibromopropyl)phosphate." Human & Experimental Toxicology 13, no. 12 (1994): 861–65. http://dx.doi.org/10.1177/096032719401301208.

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1 The genotoxicity of the flame retardant tris(2,3-dibromopropyl)phosphate (Tris-BP) was studied in vivo. Results showed that Tris-BP was highly clasfogenic, but it could only initiate a low number of preneoplastic foci in the rat liver in vivo. In Drosophila, Tris-BP could be classified as a cross-linking agent, because it was more clastogenic than mutagenic. The use of completely deuterated Tris-BP as a metabolic probe revealed that cytochrome P450 and most likely the formation of 2-bromoacrolein (2BA) from Tris-BP is important for the observed genotoxic effects. 2 In contrast to the high mu

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Trebst, A., B. Depka, S. M. Ridley, and A. F. Hawkins. "Inhibition of Photosynthetic Electron Transport by Halogenated 4-Hydroxy-pyridines." Zeitschrift für Naturforschung C 40, no. 5-6 (1985): 391–99. http://dx.doi.org/10.1515/znc-1985-5-618.

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Abstract Herbicidal halogen substituted 4-hydroxypyridines are inhibitors of photosynthetic electron flow in isolated thylakoid membranes by interfering with the acceptor side of photosystem II. Tetrabromo-4-hydroxypyridine, the most active compound found, has a pI50-value of 7.6 in the inhibition of oxygen evolution in both the reduction of an acceptor of photosystem I and an acceptor of photosystem II. The new inhibitors displace both metribuzin and ioxynil from the membrane. The 4-hydroxypyridines, like ioxynil, have unimpaired inhibitor potency in Tristreated chloroplasts, whereas the DCMU

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Bailey, Nicholas, Alaina Atanes, and Bradley O. Ashburn. "(E)-3-(4-Chlorophenyl)-1-(2-fluoro-4-methoxyphenyl)-2-propen-1-one." Molbank 2021, no. 1 (2021): M1184. http://dx.doi.org/10.3390/m1184.

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Natural products known as chalcones show promise as chemotherapeutic agents for the neglected tropical disease known as leishmaniasis. Our objective is to synthesize new targets of opportunity that may lead to better treatments of this debilitating disease. Claisen-Schmidt condensation of 4-chlorobenzaldehyde with 2′-fluoro-4′-methoxyacetophenone using aqueous sodium hydroxide in ethanol yielded the novel compound (E)-3-(4-chlorophenyl)-1-(2-fluoro-4-methoxyphenyl)-2-propen-1-one. The product was obtained in good yield and purity after recrystallization from ethyl acetate/hexane. With the know

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Neubauer, Pia R., Olga Blifernez-Klassen, Lara Pfaff, Mohamed Ismail, Olaf Kruse, and Norbert Sewald. "Two Novel, Flavin-Dependent Halogenases from the Bacterial Consortia of Botryococcus braunii Catalyze Mono- and Dibromination." Catalysts 11, no. 4 (2021): 485. http://dx.doi.org/10.3390/catal11040485.

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Halogen substituents often lead to a profound effect on the biological activity of organic compounds. Flavin-dependent halogenases offer the possibility of regioselective halogenation at non-activated carbon atoms, while employing only halide salts and molecular oxygen. However, low enzyme activity, instability, and narrow substrate scope compromise the use of enzymatic halogenation as an economical and environmentally friendly process. To overcome these drawbacks, it is of tremendous interest to identify novel halogenases with high enzymatic activity and novel substrate scopes. Previously, Ne

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Praveen, Aletti S., Hemmige S. Yathirajan, Badiadka Narayana, Thomas Gerber, Eric Hosten, and Richard Betz. "(2E)-1-(2,6-Dichloro-3-fluorophenyl)-3-phenylprop-2-en-1-one." Acta Crystallographica Section E Structure Reports Online 68, no. 4 (2012): o1085. http://dx.doi.org/10.1107/s1600536812010574.

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In the title compound, C15H9Cl2FO, the F atom shows positional disorder over two positions, with site-occupancy factors of 0.747 (4) and 0.253 (4). The dihedral angle between the rings is 86.37 (10)°. In the crystal, C—H...O contacts connect the molecules into chains along thecaxis. The shortest inter-centroid distance between two aromatic systems is 3.6686 (12) Å and is apparent between the halogenated rings.

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Kim, T. U., G. Amy, and J. E. Drewes. "Rejection of trace organic compounds by high-pressure membranes." Water Science and Technology 51, no. 6-7 (2005): 335–44. http://dx.doi.org/10.2166/wst.2005.0654.

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High-pressure membranes, encompassing reverse osmosis (RO), nanofiltration (NF), and low-pressure RO, may provide an effective treatment barrier for trace organic compounds including disinfection by-products (DBPs), pesticides, solvents, endocrine disrupting compounds (EDCs) and pharmaceutically active compounds (PhACs). The objective is to develop a mechanistic understanding of the rejection of trace organic compounds by high-pressure membranes, based on an integrated framework of compound properties, membrane properties, and operational conditions. Eight trace organic compounds, four DBPs an

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Sethi, Arun, Akriti Bhatia, Ranvijay Pratap Singh, and Atul Srivastava. "Synthesis and Evaluation of Some Novel Pregnane Derivatives as Anti-Hyperlipidemic and Anti-Oxidant Agents." Letters in Organic Chemistry 16, no. 1 (2018): 40–49. http://dx.doi.org/10.2174/1570178615666180806123719.

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In the present paper, synthesis of few novel pregnane derivatives and their evaluation as potential anti-hyperlipidemic and anti-oxidant agents has been reported. The synthesis of 3&#946;-hydroxy- 16&#945;-methoxy pregn-5-en-20-one (4) was achieved by reaction of 3&#946;-hydroxy-5,16-pregnadiene-20-one (3) with KOH/MeOH under reflux. Compound 4 on treatment with succinic and phthalic anhydride afforded compound 6 and 7, respectively. The reaction of the C-20-oxime-pregnadiene (8) with 1,5- dibromohexane yielded 20-(O-6-bromo hexyl)-oximino-3&#946;-hydroxy-pregn-5, 16-diene (9).

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Ali, Akbar, Muhammad Khalid, Saba Abid, et al. "Green Synthesis, SC-XRD, Non-Covalent Interactive Potential and Electronic Communication via DFT Exploration of Pyridine-Based Hydrazone." Crystals 10, no. 9 (2020): 778. http://dx.doi.org/10.3390/cryst10090778.

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Ultrasound-based synthesis at room temperature produces valuable compounds greener and safer than most other methods. This study presents the sonochemical fabrication and characterization of a pyridine-based halogenated hydrazone, (E)-2-((6-chloropyridin-2-yl)oxy)-N′-(2-hydroxybenzylidene) acetohydrazide (HBPAH). The NMR spectroscopic technique was used to determine the structure, while SC-XRD confirmed its crystalline nature. Our structural studies revealed that strong, inter-molecular attractive forces stabilize this crystalline organic compound. Moreover, the compound was optimized at the B

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Louw, Stefan, Lineekela Kandjengo, and Michael G. Knott. "Gas Chromatography-Mass Spectrometry (GC-MS) Combined with Retention Index Prediction for the Rapid Identification of Halogenated monoterpenes from a Namibian Plocamium species." Natural Product Communications 12, no. 2 (2017): 1934578X1701200. http://dx.doi.org/10.1177/1934578x1701200217.

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Plocamium species collected from the Namibian coast display morphological features similar to those of both P. rigidum and P. suhrii which makes identification of these species a difficult task. It has been reported that the major secondary metabolites found in various Plocamium species are unique to each species [1]. In this study GC-MS combined with a retention index (RI) prediction strategy was used for the rapid identification of halogenated monoterpenes characteristic of a particular Namibian Plocamium species. The RIs of the metabolites were matched with the predicted RIs of halogenated

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Dias, Daniel A., and Sylvia Urban. "Phytochemical Investigation of the Australian Lichens Ramalina glaucescens and Xanthoria parietina." Natural Product Communications 4, no. 7 (2009): 1934578X0900400. http://dx.doi.org/10.1177/1934578x0900400717.

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Phytochemical investigation of the Australian lichen, Ramalina glaucescens resulted in the isolation of a new halogenated depside, 5-chlorosekikaic acid 5, together with (+)-usnic acid 1, sekikaic acid 2, atranorin 6 and parietin 7, the latter of which was isolated from the associated (co-occurring) lichen, X. parietina. Compound 5 is suspected to be an artifact of the isolation procedure. All structures were assigned using spectroscopic methods and mass spectrometry. In addition to the full characterization of 5, this report represents the first application of 2D NMR spectroscopy to complete

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Janssen, Dick B., and Wim de Koning. "Development and application of bacterial cultures for the removal of chlorinated aliphatics." Water Science and Technology 31, no. 1 (1995): 237–47. http://dx.doi.org/10.2166/wst.1995.0053.

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The possibility of obtaining microbial cultures for the degradation of halogenated aliphatic hydrocarbons is mainly determined by the diversity and activity of catabolic enzymes that exist in nature. If a suitable organism is available, applications for the treatment of different waste streams can be developed. The relation between the kinetic parameters of the key enzymes and the properties of the organisms relevant for such applications is discussed, both for growth supporting and cometabolic degradation. When growth on a chlorinated aliphatic compound is possible, development of a biologica

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Cobb, Gordon D., and Edward J. Bouwer. "Effects of electron acceptors on halogenated organic compound biotransformations in a biofilm column." Environmental Science & Technology 25, no. 6 (1991): 1068–74. http://dx.doi.org/10.1021/es00018a008.

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Grøn, C., and H. P. Dybdahl. "Determination of total organic halogens (TOX); bias from a non-halogenated organic compound." Environment International 22, no. 3 (1996): 325–29. http://dx.doi.org/10.1016/0160-4120(96)00018-9.

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Arrhenius, Karine, Haleh Bohlen, Oliver Büker, Iris de Krom, Dita Heikens, and Janneke van Wijk. "Hydrogen Purity Analysis: Suitability of Sorbent Tubes for Trapping Hydrocarbons, Halogenated Hydrocarbons and Sulphur Compounds." Applied Sciences 10, no. 1 (2019): 120. http://dx.doi.org/10.3390/app10010120.

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The ISO 14687-2 standard sets requirements for the purity of the hydrogen that is delivered at refuelling stations. These specifications cover a wide range of impurities and include challenging measurements, mainly due to the very low levels of the required detection limits and the need for “total” measurements (total hydrocarbons, total sulphur compounds, halogenated compounds). Most of the compounds belonging to the species are organic. Thermal desorption often coupled with gas chromatography is a common speciation method used to determine the content of organic impurities. However, no exist

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