Base de dados : MEDLINE
Pesquisa : D01.132.105.050 [Categoria DeCS]
Referências encontradas : 2368 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 237 ir para página                         

  1 / 2368 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29311505
[Au] Autor:Tamura S; Sato K; Kawano T
[Ad] Endereço:Department of Medicinal and Organic Chemistry, School of Pharmacy, Iwate Medical University.
[Ti] Título:N-Alkylation Using Sodium Triacetoxyborohydride with Carboxylic Acids as Alkyl Sources.
[So] Source:Chem Pharm Bull (Tokyo);66(1):101-103, 2018.
[Is] ISSN:1347-5223
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:A versatile N-alkylation was performed using sodium triacetoxyborohydride and carboxylic acid as an alkyl source. The combination of these reagents furnished products different from those given previously by a similar reaction. Moreover, the mild conditions of our method allowed some functional groups to remain through the reaction, whereas they would react and be converted into other moieties in the similar reductive N-alkylation reported previously. Herein, we provide a new procedure for the preparation of various compounds containing nitrogen atoms.
[Mh] Termos MeSH primário: Aminas/síntese química
Boroidretos/química
Ácidos Carboxílicos/química
[Mh] Termos MeSH secundário: Alquilação
Aminas/química
Estrutura Molecular
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amines); 0 (Borohydrides); 0 (Carboxylic Acids)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180213
[Lr] Data última revisão:
180213
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180110
[St] Status:MEDLINE
[do] DOI:10.1248/cpb.c17-00716


  2 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28437746
[Au] Autor:Khan S; Runguo W; Tahir K; Jichuan Z; Zhang L
[Ad] Endereço:State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China; Institute of Chemical Sciences, Gomal University, D.I.Khan, Pakistan.
[Ti] Título:Catalytic reduction of 4-nitrophenol and photo inhibition of Pseudomonas aeruginosa using gold nanoparticles as photocatalyst.
[So] Source:J Photochem Photobiol B;170:181-187, 2017 May.
[Is] ISSN:1873-2682
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:A simple, green method is described for the synthesis of Gold (Au) nanoparticles (NPs) using Cotoneaster horizontalis extract as a phyto-reducer and capping agent with superior photo inhibition activity against Pseudomonas aeruginosa. Different from the other methods used elevated temperatures for nanoparticles synthesis, the novelty of our method lies in its energy saving process and fast synthesis rates (~5min for AuNPs), and its potential to tune the nanoparticles size and afterward their catalytic activity. The starch, fatty acid and reducing sugars present in the extract are mostly responsible for repaid reduction rate Au ions to AuNPs. Strong Plasmon resonance (SPR) of AuNPs was observed at 560nm, which indicates the formation of gold nanoparticles. Uv-visible spectroscopy, high resolution transmission electron microscope (HRTEM) and energy dispersion X-ray diffraction (XRD) were preformed to find out the formation of AuNPs. Proficient reduction of 4-nitrophenol (4-NP) into 4-aminophenol (4-AP) in the presence of AuNPs and NaBH was observed and was found to depend upon the nanoparticle size or the extract concentration. The AuNPs was also evaluated for antibacterial against P. aeruginosa. Before transferred it into antibacterial activity, it placed under visible light for 120min. The same experiment was performed in dark as control medium. The photo irradiated AuNPs was observed to be more effective against P. aeruginosa. The result showed that diameter of zone of inhibition of visible light irradiated AuNPs against P. aeruginosa was 17 (±0.5) and in dark was 8 (±0.4) mm.
[Mh] Termos MeSH primário: Antibacterianos/farmacologia
Ouro/química
Nanopartículas Metálicas/toxicidade
Nitrofenóis/química
Pseudomonas aeruginosa/efeitos dos fármacos
[Mh] Termos MeSH secundário: Antibacterianos/química
Boroidretos/química
Catálise
Química Verde
Luz
Nanopartículas Metálicas/química
Testes de Sensibilidade Microbiana
Microscopia Eletrônica de Transmissão
Nitrofenóis/toxicidade
Oxirredução
Extratos Vegetais/química
Folhas de Planta/química
Folhas de Planta/metabolismo
Pseudomonas aeruginosa/efeitos da radiação
Rosaceae/química
Rosaceae/metabolismo
Espectrometria por Raios X
Ressonância de Plasmônio de Superfície
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Borohydrides); 0 (Nitrophenols); 0 (Plant Extracts); 7440-57-5 (Gold); 87L0B9CPPA (sodium borohydride); Y92ZL45L4R (4-nitrophenol)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170920
[Lr] Data última revisão:
170920
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170425
[St] Status:MEDLINE


  3 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28407889
[Au] Autor:Lin YR; Huang MF; Wu YY; Liu MC; Huang JH; Chen Z; Shiue YL; Wu CE; Liang SS
[Ad] Endereço:Department of Biotechnology, School of Environment and Life Sciences, Fooyin University, Kaohsiung, Taiwan.
[Ti] Título:Reductive amination derivatization for the quantification of garlic components by isotope dilution analysis.
[So] Source:Food Chem;230:1-5, 2017 Sep 01.
[Is] ISSN:0308-8146
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this work, we synthesized internal standards for four garlic organosulfur compounds (OSCs) by reductive amination with C, D -formaldehyde, and developed an isotope dilution analysis method to quantitate these organosulfur components in garlic samples. Internal standards were synthesized for internal absolute quantification of S-allylcysteine (SAC), S-allylcysteine sulfoxide (alliin), S-methylcysteine (SMC), and S-ethylcysteine (SEC). We used a multiple reaction monitoring (MRM) to detect C, D -formaldehyde-modified OSCs by ultrahigh-performance liquid phase chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS) and obtained MS spectra showing different ratios of C, D -formaldehyde-modified and H -formaldehyde-modified compounds. The resulting labeled and unlabeled OSCs were exhibited correlation coefficient (R ) ranged from 0.9989 to 0.9994, respectively. The average recoveries for four OSCs at three concentration levels ranged from 89% to 105%. By C, D -formaldehyde and sodium cyanoborohydride, the reductive amination-based method can be utilized to generate novel internal standard for isotope dilution and to extend the quantitative application.
[Mh] Termos MeSH primário: Cisteína/análogos & derivados
Alho/química
[Mh] Termos MeSH secundário: Aminação
Boroidretos/química
Isótopos de Carbono
Cromatografia Líquida de Alta Pressão
Cisteína/análise
Cisteína/química
Formaldeído/química
Padrões de Referência
Espectrometria de Massas em Tandem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Borohydrides); 0 (Carbon Isotopes); 1HG84L3525 (Formaldehyde); 7I4L2D0E9G (alliin); 81R3X99M15 (S-allylcysteine); A34I1H07YM (S-methylcysteine); B46YS921BY (S-ethylcysteine); C4I8C58P9T (sodium cyanoborohydride); K848JZ4886 (Cysteine)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170605
[Lr] Data última revisão:
170605
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170415
[St] Status:MEDLINE


  4 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28254308
[Au] Autor:Cardoso VS; de Carvalho Filgueiras M; Dutra YM; Teles RH; de Araújo AR; Primo FL; Mafud AC; Batista LF; Mascarenhas YP; Paino IM; Zucolotto V; Tedesco AC; Silva DA; Leite JR; Dos Santos JR
[Ad] Endereço:Research Center in Biodiversity and Biotechnology, Biotec, Campus Ministro Reis Velloso, Federal University of Piauí, UFPI, 64202020 Parnaíba, Piauí, Brazil; Physiotherapy Department, Campus Ministro Reis Velloso, Federal University of Piauí, UFPI, 64202020 Parnaíba, Piauí, Brazil. Electronic addres
[Ti] Título:Collagen-based silver nanoparticles: Study on cell viability, skin permeation, and swelling inhibition.
[So] Source:Mater Sci Eng C Mater Biol Appl;74:382-388, 2017 May 01.
[Is] ISSN:1873-0191
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Collagen is considered the most abundant protein in the animal kingdom, comprising 30% of the total amount of proteins and 6% of the human body by weight. Studies that examine the interaction between silver nanoparticles and proteins have been highlighted in the literature in order to understand the stability of the nanoparticle system, the effects observed in biological systems, and the appearance of new chemical pharmaceutical products. The objective of this study was to analyze the behavior of silver nanoparticles stabilized with collagen (AgNPcol) and to check the skin permeation capacity and action in paw edema induced by carrageenan. AgNPcol synthesis was carried out using solutions of reducing agent sodium borohydride (NaBH ), silver nitrate (AgNO ) and collagen. Characterization was done by using dynamic light scattering (DLS) and X-ray diffraction (XRD) and AFM. Cellular viability testing was performed by using flow cytometry in human melanoma cancer (MV3) and murine fibroblast (L929) cells. The skin permeation study was conducted using a Franz diffusion cell, and the efficiency of AgNPcol against the formation of paw edema in mice was evaluated. The hydrodynamic diameter and zeta potential of AgNPcol were 140.7±7.8nm and 20.1±0.7mV, respectively. AgNPcol failed to induce early apoptosis, late apoptosis, and necrosis in L929 cells; however, it exhibited enhanced toxicity in cancer cells (MV3) compared to normal cells (L929). AgNPcol demonstrated increased toxicological effects in cancer MV3 cells, promoting skin permeation, and preventing paw edema.
[Mh] Termos MeSH primário: Materiais Biocompatíveis/química
Colágeno/química
Nanopartículas Metálicas/química
Prata/química
[Mh] Termos MeSH secundário: Animais
Apoptose/efeitos dos fármacos
Materiais Biocompatíveis/farmacologia
Materiais Biocompatíveis/uso terapêutico
Boroidretos/química
Carragenina/toxicidade
Linhagem Celular
Difusão Dinâmica da Luz
Edema/induzido quimicamente
Edema/tratamento farmacológico
Seres Humanos
Masculino
Nanopartículas Metálicas/toxicidade
Camundongos
Microscopia de Força Atômica
Permeabilidade/efeitos dos fármacos
Espécies Reativas de Oxigênio/metabolismo
Nitrato de Prata/química
Pele/efeitos dos fármacos
Pele/metabolismo
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biocompatible Materials); 0 (Borohydrides); 0 (Reactive Oxygen Species); 3M4G523W1G (Silver); 87L0B9CPPA (sodium borohydride); 9000-07-1 (Carrageenan); 9007-34-5 (Collagen); 95IT3W8JZE (Silver Nitrate)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170614
[Lr] Data última revisão:
170614
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170304
[St] Status:MEDLINE


  5 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28222361
[Au] Autor:Arul V; Edison TN; Lee YR; Sethuraman MG
[Ad] Endereço:Department of Chemistry, Gandhigram Rural Institute-Deemed University, Gandhigram 624 302, Dindigul District, Tamilnadu, India.
[Ti] Título:Biological and catalytic applications of green synthesized fluorescent N-doped carbon dots using Hylocereus undatus.
[So] Source:J Photochem Photobiol B;168:142-148, 2017 Mar.
[Is] ISSN:1873-2682
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:In this work, a simple hydrothermal route for the synthesis of fluorescent nitrogen doped carbon dots (N-CDs) is reported. The Hylocereus undatus (H. undatus) extract and aqueous ammonia are used as carbon and nitrogen source, respectively. The optical properties of synthesized N-CDs are analyzed using UV-Visible (UV-Vis) and fluorescence spectroscopy. The surface morphology, elemental composition, crystallinity and functional groups present in the N-CDs are examined using high resolution transmission electron microscopy (HR-TEM) with energy dispersive spectroscopy (EDS), selected area electron diffraction (SAED), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy, respectively. The synthesized N-CDs emit strong blue fluorescence at 400nm under the excitation of 320nm. Further, the excitation dependent emission properties are also observed from the fluorescence of synthesized N-CDs. The HR-TEM results reveal that synthesized N-CDs are in spherical shape with average diameter of 2.5nm. The XRD pattern exhibits, the graphitic nature of synthesized N-CDs. The doping of nitrogen is confirmed from the EDS and FT-IR studies. The cytotoxicity and biocompatibility of N-CDs are evaluated through MTT assay on L-929 (Lymphoblastoid-929) and MCF-7 (Michigan Cancer Foundation-7) cells. The results indicate that the fluorescent N-CDs show less cytotoxicity and good biocompatibility on both L-929 and MCF-7 cells. Moreover, the N-CDs show excellent catalytic activity towards the reduction of methylene blue by sodium borohydride.
[Mh] Termos MeSH primário: Cactaceae
Química Verde/métodos
Azul de Metileno/metabolismo
Pontos Quânticos/química
[Mh] Termos MeSH secundário: Animais
Boroidretos
Carbono
Catálise
Linhagem Celular Tumoral
Seres Humanos
Células MCF-7
Camundongos
Nitrogênio
Oxirredução
Extratos Vegetais
Análise Espectral
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Borohydrides); 0 (Plant Extracts); 7440-44-0 (Carbon); 87L0B9CPPA (sodium borohydride); N762921K75 (Nitrogen); T42P99266K (Methylene Blue)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170410
[Lr] Data última revisão:
170410
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170222
[St] Status:MEDLINE


  6 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28114947
[Au] Autor:Futamura G; Kawabata S; Nonoguchi N; Hiramatsu R; Toho T; Tanaka H; Masunaga SI; Hattori Y; Kirihata M; Ono K; Kuroiwa T; Miyatake SI
[Ad] Endereço:Department of Neurosurgery, Osaka Medical College, 2-7 Daigakumachi, Takatuki-shi, Osaka, Japan.
[Ti] Título:Evaluation of a novel sodium borocaptate-containing unnatural amino acid as a boron delivery agent for neutron capture therapy of the F98 rat glioma.
[So] Source:Radiat Oncol;12(1):26, 2017 Jan 23.
[Is] ISSN:1748-717X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Boron neutron capture therapy (BNCT) is a unique particle radiation therapy based on the nuclear capture reactions in boron-10. We developed a novel boron-10 containing sodium borocaptate (BSH) derivative, 1-amino-3-fluorocyclobutane-1-carboxylic acid (ACBC)-BSH. ACBC is a tumor selective synthetic amino acid. The purpose of this study was to assess the biodistribution of ACBC-BSH and its therapeutic efficacy following Boron Neutron Capture Therapy (BNCT) of the F98 rat glioma. METHODS: We evaluated the biodistribution of three boron-10 compounds, ACBC-BSH, BSH and boronophenylalanine (BPA), in vitro and in vivo, following intravenous (i.v.) administration and intratumoral (i.t.) convection-enhanced delivery (CED) in F98 rat glioma bearing rats. For BNCT studies, rats were stratified into five groups: untreated controls, neutron-irradiation controls, BNCT with BPA/i.v., BNCT with ACBC-BSH/CED, and BNCT concomitantly using BPA/i.v. and ACBC-BSH/CED. RESULTS: In vitro, ACBC-BSH attained higher cellular uptake F98 rat glioma cells compared with BSH. In vivo biodistribution studies following i.v. administration and i.t. CED of ACBC-BSH attained significantly higher boron concentrations than that of BSH, but much lower than that of BPA. However, following convection enhanced delivery (CED), ACBC-BSH attained significantly higher tumor concentrations than BPA. The i.t. boron-10 concentrations were almost equal between the ACBC-BSH/CED group and BPA/i.v. group of rats. The tumor/brain boron-10 concentration ratio was higher with ACBC-BSH/CED than that of BPA/i.v. group. Based on these data, BNCT studies were carried out in F98 glioma bearing rats using BPA/i.v. and ACBC-BSH/CED as the delivery agents. The corresponding mean survival times were 37.4 ± 2.6d and 44.3 ± 8.0d, respectively, and although modest, these differences were statistically significant. CONCLUSIONS: Our findings suggest that further studies are warranted to evaluate ACBC-BSH/CED as a boron delivery agent.
[Mh] Termos MeSH primário: Boroidretos/química
Terapia por Captura de Nêutron de Boro
Neoplasias Encefálicas/radioterapia
Sistemas de Liberação de Medicamentos
Glioma/radioterapia
Compostos de Sulfidrila/química
[Mh] Termos MeSH secundário: Animais
Barreira Hematoencefálica
Boroidretos/farmacocinética
Masculino
Ratos
Ratos Endogâmicos F344
Compostos de Sulfidrila/farmacocinética
Distribuição Tecidual
Células Tumorais Cultivadas
[Pt] Tipo de publicação:EVALUATION STUDIES; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Borohydrides); 0 (Sulfhydryl Compounds); 12294-22-3 (mercaptoundecahydrododecaborate)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170814
[Lr] Data última revisão:
170814
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170125
[St] Status:MEDLINE
[do] DOI:10.1186/s13014-017-0765-4


  7 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28082224
[Au] Autor:Zhang H; Bai Y; Zhou W; Chen F
[Ad] Endereço:State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China.
[Ti] Título:Color reduction of sulfonated eucalyptus kraft lignin.
[So] Source:Int J Biol Macromol;97:201-208, 2017 Apr.
[Is] ISSN:1879-0003
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Several eucalyptus lignins named as HSL, SML and BSL were prepared by high temperature sulfonation, sulfomethylation, butane sultone sulfonation respectively. The color properties of samples were investigated. Under optimized conditions the sulfonic group (SO H) content of HSL, SML and BSL reached 1.52, 1.60 and 1.58mmol/g, respectively. Samples were characterized by UV-vis spectroscopy, FTIR spectroscopy, H NMR spectroscopy, GPC and brightness test, respectively. The results revealed that BSL performed a higher molecular weight and lighter color due to the phenolic hydroxyl blocking by 1,4-butane sultone (1,4-BS). The color reduction of sodium borohydride treated BSL (labeled as SBSL) was further enhanced and the brightness value was improved by 76.1% compared with the darkest HSL. SBSL process was much better than HSL and SML process. Hydroxyl blocking effect of 1,4-BS and reducibility of sodium borohydride played important roles in the color reduction of sulfonated eucalyptus kraft lignin.
[Mh] Termos MeSH primário: Alcanossulfonatos/química
Eucalyptus/química
Lignina/química
[Mh] Termos MeSH secundário: Boroidretos/química
Cor
Peso Molecular
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alkanesulfonates); 0 (Borohydrides); 1633-83-6 (butanesultone); 8068-05-1 (Kraft lignin); 87L0B9CPPA (sodium borohydride); 9005-53-2 (Lignin)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170410
[Lr] Data última revisão:
170410
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170114
[St] Status:MEDLINE


  8 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27942755
[Au] Autor:Prokopijevic M; Prodanovic O; Spasojevic D; Kovacevic G; Polovic N; Radotic K; Prodanovic R
[Ad] Endereço:Institute for Multidisciplinary Research, University of Belgrade, Kneza Viseslava 1, Belgrade, 11030, Serbia.
[Ti] Título:Tyramine-modified pectins via periodate oxidation for soybean hull peroxidase induced hydrogel formation and immobilization.
[So] Source:Appl Microbiol Biotechnol;101(6):2281-2290, 2017 Mar.
[Is] ISSN:1432-0614
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Pectin was modified by oxidation with sodium periodate at molar ratios of 2.5, 5, 10, 15 and 20 mol% and reductive amination with tyramine and sodium cyanoborohydride afterwards. Concentration of tyramine groups within modified pectin ranged from 54.5 to 538 µmol/g of dry pectin while concentration of ionizable groups ranged from 3.0 to 4.0 mmol/g of dry polymer compared to 1.5 mmol/g before modification due to the introduction of amino group. All tyramine-pectins showed exceptional gelling properties and could form hydrogel both by cross-linking of carboxyl groups with calcium or by cross-linking phenol groups with peroxidase in the presence of hydrogen peroxide. These hydrogels were tested as carriers for soybean hull peroxidase (SHP) immobilization within microbeads formed in an emulsion based enzymatic polymerization reaction. SHP immobilized within tyramine-pectin microbeads had an increased thermal and organic solvent stability compared to the soluble enzyme. Immobilized SHP was more active in acidic pH region and had slightly decreased K value of 2.61 mM compared to the soluble enzyme. After 7 cycles of repeated use in batch reactor for pyrogallol oxidation microbeads, immobilized SHP retained half of the initial activity.
[Mh] Termos MeSH primário: Enzimas Imobilizadas/química
Pectinas/química
Ácido Periódico/química
Peroxidase/química
Proteínas de Plantas/química
Feijão de Soja/química
[Mh] Termos MeSH secundário: Boroidretos/química
Reutilização de Equipamento
Hidrogéis/química
Peróxido de Hidrogênio/química
Concentração de Íons de Hidrogênio
Cinética
Oxirredução
Feijão de Soja/enzimologia
Tiramina/química
Resíduos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Borohydrides); 0 (Enzymes, Immobilized); 0 (Hydrogels); 0 (Pectins); 0 (Plant Proteins); 0 (Waste Products); 10450-60-9 (Periodic Acid); B45A1BUM4Q (metaperiodate); BBX060AN9V (Hydrogen Peroxide); C4I8C58P9T (sodium cyanoborohydride); EC 1.11.1.7 (Peroxidase); X8ZC7V0OX3 (Tyramine)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170307
[Lr] Data última revisão:
170307
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161213
[St] Status:MEDLINE
[do] DOI:10.1007/s00253-016-8002-x


  9 / 2368 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27854056
[Au] Autor:Song X; Shi X
[Ad] Endereço:School of Resource and Environmental Engineering, Anhui University, Hefei, 230601, China.
[Ti] Título:Bioreductive deposition of highly dispersed Ag nanoparticles on carbon nanotubes with enhanced catalytic degradation for 4-nitrophenol assisted by Shewanella oneidensis MR-1.
[So] Source:Environ Sci Pollut Res Int;24(3):3038-3044, 2017 Jan.
[Is] ISSN:1614-7499
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Biogenetic nanomaterials research provides insights and valuable implications for the green synthesis of nanomaterials and auxiliary biodegradation behaviors. Ag nanoparticles (Ag NPs) fabricated on multiwalled carbon nanotubes (MWNTs) (Ag/MWNTs nanocomposites) are prepared in situ assisted by Shewanella oneidensis MR-1 (S. oneidensis MR-1) that provide respiratory pathway to transmit electrons. The Ag/MWNTs nanocomposites are characterized by a scanning electron microscopy (SEM), an energy dispersive X-ray (EDX), a transmission electron microscopy (TEM), an X-ray diffraction (XRD), and an X-ray photoelectron spectroscopy (XPS), respectively. The results indicate that Ag NPs (less than 20 nm in diameter) are successfully formed on the MWNTs without an aggregation. In application studies, the catalytic activities of the Ag/MWNTs nanocomposites towards the reduction of 4-nitrophenol (4-NP) by sodium borohydride (NaBH ) are tracked by a UV-visible spectroscopy. It is suggested that the Ag/MWNTs nanocomposites exhibit a satisfactory catalytic efficiency, which might be ascribed to the high dispersion of Ag NPs on MWNT surfaces. Moreover, the final results indicate that only after 10 min of reaction, the catalytic degradation ratio of 4-NP reaches 94.0% in the presence of Ag/MWNTs nanocomposites assisted by S. oneidensis MR-1.
[Mh] Termos MeSH primário: Nanotubos de Carbono
Shewanella
Prata
[Mh] Termos MeSH secundário: Boroidretos
Catálise
Nanopartículas Metálicas/química
Microscopia Eletrônica de Varredura
Microscopia Eletrônica de Transmissão
Nanocompostos/química
Nitrofenóis/química
Espectroscopia Fotoeletrônica
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Borohydrides); 0 (Nanotubes, Carbon); 0 (Nitrophenols); 3M4G523W1G (Silver); 87L0B9CPPA (sodium borohydride); Y92ZL45L4R (4-nitrophenol)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:171104
[Lr] Data última revisão:
171104
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161118
[St] Status:MEDLINE
[do] DOI:10.1007/s11356-016-8076-0


  10 / 2368 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27665075
[Au] Autor:Lebaschi S; Hekmati M; Veisi H
[Ad] Endereço:Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Chemistry, Pharmaceutical Sciences Branch, Islamic Azad University (IAUPS), Tehran, Iran.
[Ti] Título:Green synthesis of palladium nanoparticles mediated by black tea leaves (Camellia sinensis) extract: Catalytic activity in the reduction of 4-nitrophenol and Suzuki-Miyaura coupling reaction under ligand-free conditions.
[So] Source:J Colloid Interface Sci;485:223-231, 2017 Jan 01.
[Is] ISSN:1095-7103
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The present study was conducted to synthesize palladium nanoparticles (Pd NPs) through a facile and green route using non-toxic and renewable natural black tea leaves (Camellia sinensis) extract, as the reducing and stabilizing agent. The as-prepared Pd@B.tea NPs catalyst was characterized by UV-vis spectroscopy, X-ray diffraction (XRD), fourier transformed infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS). The Pd@B.tea NPs catalyst could be used as an efficient and heterogeneous catalyst for Suzuki coupling reactions between phenylboronic acid and a range of aryl halides (X=I, Br, Cl) and also the reduction of 4-nitrophenol (4-NP) using sodium borohydride in an environmental friendly medium. Excellent yields of products were obtained with a wide range of substrates and the catalyst was recycled 7 times without any significant loss of its catalytic activity.
[Mh] Termos MeSH primário: Camellia sinensis/química
Nanopartículas Metálicas/química
Nitrofenóis/química
Paládio/química
Folhas de Planta/química
[Mh] Termos MeSH secundário: Boroidretos/química
Ácidos Borônicos/química
Catálise
Química Verde
Nanopartículas Metálicas/ultraestrutura
Oxirredução
Extratos Vegetais/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Borohydrides); 0 (Boronic Acids); 0 (Nitrophenols); 0 (Plant Extracts); 5TWQ1V240M (Palladium); 87L0B9CPPA (sodium borohydride); L12H7B02G5 (benzeneboronic acid); Y92ZL45L4R (4-nitrophenol)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170916
[Lr] Data última revisão:
170916
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160926
[St] Status:MEDLINE



página 1 de 237 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde