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[PMID]:29175406
[Au] Autor:Sohn SY; Kuntze K; Nijenhuis I; Häggblom MM
[Ad] Endereço:Department of Biochemistry and Microbiology, School of Environmental and Biological Sciences, Rutgers University, 76 Lipman Drive, New Brunswick, NJ 08901, USA.
[Ti] Título:Evaluation of carbon isotope fractionation during anaerobic reductive dehalogenation of chlorinated and brominated benzenes.
[So] Source:Chemosphere;193:785-792, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Compound specific stable isotope analysis (CSIA) has been established as a useful tool to evaluate in situ biodegradation. Here, CSIA was used to determine microbial dehalogenation of chloro- and bromobenzenes in microcosms derived from Hackensack River sediments. Gas chromatography-isotope ratio mass spectrometry (GC-IRMS) was used to measure carbon isotope fractionation during reductive dehalogenation of hexachlorobenzene (HCB), pentachlorobenzene (PeCB), 1,2,3,5-tetrachlorobenzene (TeCB), 1,2,3,5-tetrabromobenzene (TeBB), and 1,3,5-tribromobenzene (TriBB). Strong evidence of isotope fractionation coupled to dehalogenation was not observed in the substrate, possibly due to the low solubilities of the highly halogenated benzene substrates and a dilution of the isotope signal. Nonetheless, we could measure a depletion of the δ C value in the dichlorobenzene product during dechlorination of HCB, the sequential depletion and enrichment of δ C value for trichlorobenzene in TeCB dechlorinating cultures, and the enrichment of δ C during debromination of TriBB. This indicates that a measurable isotope fractionation occurred during reductive dehalogenation of highly halogenated chloro- and bromobenzenes in aquatic sediments. Thus, although more quantitative measurements will be needed, the data suggests that CSIA may have application for monitoring in situ microbial reductive dehalogenation of highly halogenated benzenes.
[Mh] Termos MeSH primário: Benzeno
Biodegradação Ambiental
Bromobenzenos/metabolismo
Fracionamento Químico
Clorobenzenos/metabolismo
[Mh] Termos MeSH secundário: Bromobenzenos/análise
Isótopos de Carbono/química
Clorobenzenos/análise
Monitoramento Ambiental/métodos
Cromatografia Gasosa-Espectrometria de Massas
Halogenação
Rios/química
Rios/microbiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bromobenzenes); 0 (Carbon Isotopes); 0 (Chlorobenzenes); J64922108F (Benzene)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171128
[St] Status:MEDLINE


  2 / 9454 MEDLINE  
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[PMID]:28837872
[Au] Autor:Li J; Kosugi T; Riya S; Hashimoto Y; Hou H; Terada A; Hosomi M
[Ad] Endereço:Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka, Koganei, Tokyo 184-8588, Japan.
[Ti] Título:Pollution potential leaching index as a tool to assess water leaching risk of arsenic in excavated urban soils.
[So] Source:Ecotoxicol Environ Saf;147:72-79, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Leaching of hazardous trace elements from excavated urban soils during construction of cities has received considerable attention in recent years in Japan. A new concept, the pollution potential leaching index (PPLI), was applied to assess the risk of arsenic (As) leaching from excavated soils. Sequential leaching tests (SLT) with two liquid-to-solid (L/S) ratios (10 and 20Lkg ) were conducted to determine the PPLI values, which represent the critical cumulative L/S ratios at which the average As concentrations in the cumulative leachates are reduced to critical values (10 or 5µgL ). Two models (a logarithmic function model and an empirical two-site first-order leaching model) were compared to estimate the PPLI values. The fractionations of As before and after SLT were extracted according to a five-step sequential extraction procedure. Ten alkaline excavated soils were obtained from different construction projects in Japan. Although their total As contents were low (from 6.75 to 79.4mgkg ), the As leaching was not negligible. Different L/S ratios at each step of the SLT had little influence on the cumulative As release or PPLI values. Experimentally determined PPLI values were in agreement with those from model estimations. A five-step SLT with an L/S of 10Lkg at each step, combined with a logarithmic function fitting was suggested for the easy estimation of PPLI. Results of the sequential extraction procedure showed that large portions of more labile As fractions (non-specifically and specifically sorbed fractions) were removed during long-term leaching and so were small, but non-negligible, portions of strongly bound As fractions.
[Mh] Termos MeSH primário: Arsênico/análise
Modelos Teóricos
Poluentes do Solo/análise
Solo/química
Urbanização
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Fracionamento Químico
Indústria da Construção
Japão
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); 0 (Soil Pollutants); 0 (Water Pollutants, Chemical); N712M78A8G (Arsenic)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170825
[St] Status:MEDLINE


  3 / 9454 MEDLINE  
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[PMID]:29396378
[Au] Autor:Kori S; Parmar A; Goyal J; Sharma S
[Ad] Endereço:Institute of Forensic Science & Criminology, Panjab University, Chandigarh 160 014, India.
[Ti] Título:Cloud point extraction coupled with microwave-assisted back-extraction (CPE-MABE) for determination of Eszopiclone (Z-drug) using UV-Visible, HPLC and mass spectroscopic (MS) techniques: Spiked and in vivo analysis.
[So] Source:J Chromatogr B Analyt Technol Biomed Life Sci;1074-1075:129-138, 2018 Feb 01.
[Is] ISSN:1873-376X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A procedure for the determination of Eszopiclone (ESZ) from complex matrices i.e. in vitro (spiked matrices), as well as in vivo (mice model) was developed using cloud point extraction coupled with microwave-assisted back-extraction (CPE-MABE). Analytical measurements have been carried using UV-Visible, HPLC and MS techniques. The proposed method has been validated according to ICH guidelines and legitimate reproducible and reliability of protocol is assessed through intraday and inter-day precision <3.61% and <4.70%, respectively. Limit of detection has been obtained as 0.083µg/mL and 0.472µg/mL respectively, for HPLC and UV-Visible techniques, corresponding to assessed linearity range. The coaservate phase in CPE was back extracted under microwaves exposure, with isooctane at pre-concentration factor ~50 when 5mL of sample solution was pre-concentrated to 0.1mL. Under optimized conditions i.e. Aqueous-Triton X-114 4% (w/v), pH4.0, NaCl 4% (w/v) and equilibrium temperature of 45°C for 20min, average extraction recovery has been obtained between 89.8 and 99.2% and 84.0-99.2% from UV-Visible and HPLC analysis, respectively. The method has been successfully applied to the pharmacokinetic estimation (post intraperitoneal administration) of ESZ in mice. MS analysis precisely depicted the presence of active N­desmethyl zopiclone in impales as well as in mice plasma.
[Mh] Termos MeSH primário: Cromatografia Líquida de Alta Pressão/métodos
Zopiclona/análise
Espectrometria de Massas/métodos
[Mh] Termos MeSH secundário: Animais
Fracionamento Químico
Zopiclona/química
Zopiclona/isolamento & purificação
Zopiclona/farmacocinética
Seres Humanos
Concentração de Íons de Hidrogênio
Limite de Detecção
Modelos Lineares
Masculino
Camundongos
Camundongos Endogâmicos BALB C
Micro-Ondas
Leite/química
Polietilenoglicóis
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
30IQX730WE (Polyethylene Glycols); 9036-19-5 (Nonidet P-40); UZX80K71OE (Eszopiclone)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180204
[St] Status:MEDLINE


  4 / 9454 MEDLINE  
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[PMID]:29232609
[Au] Autor:Maria John KM; Harnly J; Luthria D
[Ad] Endereço:Food Composition Methods Development Lab., Beltsville Human Nutrition Research Center, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, MD, 20705, United States.
[Ti] Título:Influence of direct and sequential extraction methodology on metabolic profiling.
[So] Source:J Chromatogr B Analyt Technol Biomed Life Sci;1073:34-42, 2018 Jan 15.
[Is] ISSN:1873-376X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A systematic comparison was made of the detected metabolite profiles for two plant materials (black beans and soybeans) and a dietary supplement (black cohosh) extracted using sequential (hexane, ethyl acetate, and 50% aqueous methanol) and direct extraction with three solvent systems (80% aqueous methanol, methanol/chloroform/water (2.5:1:1, v/v/v) and water). Extracts were analyzed by LC-MS (without derivatization) and GC-FID (with BSTFA/TMCS derivatizations). For sequential extraction, HPLC-UV and BSTFA/TMCS-derivatized GC-FID detection were more responsive to the polar molecules with a rough distribution of 10%, 10%, and 80% of the total signals in hexane, ethyl acetate, and 50% aqueous methanol, respectively. With HPLC-MS detection, the distribution of signals was more balanced, roughly 40%, 30%, and 30% for the same extracts (hexane, ethyl acetate, and 50% aqueous methanol). For direct extraction, HPLC-UV and BSTFA/TMCS-derivatized 4GC-FID provided signals between 60% and 150% of the total sequential extracted signals. The overlap of signals for the 3 sequential extracts ranged from 1% to 3%. The overlap of the signals for direct extraction with the total for sequential extraction ranged from 15% to 98%. With HPLC-MS detection, signals varied from 30% to 40% of the total signals for sequential extraction. Multivariate analysis showed that the components for the sequential and direct extracts were statistically different. However, each extract, sequential or direct, allowed discrimination between the 3 plant materials.
[Mh] Termos MeSH primário: Fracionamento Químico/métodos
Cromatografia Líquida de Alta Pressão/métodos
Cromatografia Gasosa-Espectrometria de Massas/métodos
Metabolômica/métodos
Metabolômica/normas
[Mh] Termos MeSH secundário: Fabaceae/química
Fabaceae/metabolismo
Compostos Fitoquímicos/análise
Análise de Componente Principal
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Phytochemicals)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171213
[St] Status:MEDLINE


  5 / 9454 MEDLINE  
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[PMID]:29478654
[Au] Autor:Lü C; He J; Wang B
[Ad] Endereço:School of Ecology and Environment, Inner Mongolia University, Huhhot 010021, China; Institute of Environmental Geology, Inner Mongolia University, Huhhot 010021, China. Electronic address: lcw2008@imu.edu.cn.
[Ti] Título:Spatial and historical distribution of organic phosphorus driven by environment conditions in lake sediments.
[So] Source:J Environ Sci (China);64:32-41, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The chemistry of sedimentary organic phosphorus (OP) and its fraction distribution in sediments are greatly influenced by environmental conditions such as terrestrial inputs and runoffs. The linkage of OP with environmental conditions was analyzed on the basis of OP spatial and historical distributions in lake sediments. The redundancy analysis and OP spatial distribution results suggested that both NaOH-OP (OP extracted by NaOH) and Re-OP (residual OP) in surface sediments from the selected 13 lakes reflected the gradient effects of environmental conditions and the autochthonous and/or allochthonous inputs driven by latitude zonality in China. The lake level and salinity of Lake Hulun and the runoff and precipitation of its drainage basin were reconstructed on the basis of the geochemistry index. This work showed that a gradient in weather conditions presented by the latitude zonality in China impacts the OP accumulation through multiple drivers and in many ways. The drivers are mainly precipitation and temperature, governing organic matter (OM) production, degradation rate and transportation in the watershed. Over a long temporal dimension (4000years), the vertical distributions of Re-OP and NaOH-OP based on a dated sediment profile from HLH were largely regulated by the autochthonous and/or allochthonous inputs, which depended on the environmental and climate conditions and anthropogenic activities in the drainage basin. This work provides useful environmental geochemistry information to understand the inherent linkage of OP fractionation with environmental conditions and lake evolution.
[Mh] Termos MeSH primário: Monitoramento Ambiental
Fósforo/análise
Poluentes Químicos da Água/análise
Poluição Química da Água/estatística & dados numéricos
[Mh] Termos MeSH secundário: Fracionamento Químico
China
Eutrofização
Sedimentos Geológicos/química
Lagos/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical); 27YLU75U4W (Phosphorus)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


  6 / 9454 MEDLINE  
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[PMID]:28480755
[Au] Autor:He Y; Wen L; Liu J; Li Y; Zheng F; Min W; Yue H; Pan P
[Ad] Endereço:a Department of Food Science and Engineering , Jilin Agricultural University , Changchun , China.
[Ti] Título:Optimisation of pulsed electric fields extraction of anthocyanin from Beibinghong Vitis Amurensis Rupr.
[So] Source:Nat Prod Res;32(1):23-29, 2018 Jan.
[Is] ISSN:1478-6427
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Beibinghong Vitis amurensis Rupr has wide plantation area, high productivity and rich anthocyanin. Common hot-extraction has poor deficiency and destroys anthocyanin severely. For Beibinghong V. amurensis Rupr as materials, response surface-optimised electric fields were used, the structure of Beibinghong was observed by SEM, antioxidant activity was measured by DPPH, ABTS and reducing force, the component of anthocyanin was analyzed by HPLC-MS. We found the content of total anthocyanin extracted by pulsed electric fields was 166.65 ± 3.88 mg/100 g.FW. Total anthocyanin from Beibinghong had high antioxidant activity, also contained multiple steady anthocyanin of delphinidin 3-O-glucoside, cyanidin 3-O-glucoside, petunidin 3-O-glucoside, peonidin 3-O-glucoside, malvidin 3-O-glucoside, delphinidin-3-O-(6-O-acetyl) glucoside and delphinidin-3-O-(6-O-p-coumaroyl) glucoside et al. In conclusion, the optimised pulsed electric fields method can quickly and efficiently extract several kinds of anthocyanins from V. amurensis Rupr. This study promoted the intensive processing of V. amurensis Rupr and widened the practical application of pulsed electric field technology.
[Mh] Termos MeSH primário: Antocianinas/isolamento & purificação
Fracionamento Químico/métodos
Vitis/química
[Mh] Termos MeSH secundário: Antocianinas/análise
Antocianinas/farmacologia
Antioxidantes/isolamento & purificação
Antioxidantes/farmacologia
Cromatografia Líquida de Alta Pressão/métodos
Estimulação Elétrica
Glucosídeos/análise
Espectrometria de Massas/métodos
Microscopia Eletrônica de Varredura
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anthocyanins); 0 (Antioxidants); 0 (Glucosides); 0 (delphinidin 3-O-glucopyranoside); 3419IIT8I0 (peonidin 3-glucoside); 6988-81-4 (petunidin-3-glucoside); 7084-24-4 (cyanidin 3-O-glucoside); 7228-78-6 (malvidin-3-glucoside)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170509
[St] Status:MEDLINE
[do] DOI:10.1080/14786419.2017.1324963


  7 / 9454 MEDLINE  
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[PMID]:27774906
[Au] Autor:Tylkowski B; Nowak M; Tsibranska I; Trojanowska A; Marciniak L; Valls RG; Gumi T; Giamberini M; Jastrzab R
[Ad] Endereço:Centre Tecnològic de la Química de Catalunya, Carrer de Marcel·lí Domingo, 43007 Tarragona, Spain.
[Ti] Título:Concentration and Fractionation of Polyphenols by Membrane Operations.
[So] Source:Curr Pharm Des;23(2):231-241, 2017.
[Is] ISSN:1873-4286
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: This review aims to present the relevant background information and current research status in concentration of polyphenols using membrane technologies. The potential implementation of membrane separation to bioactive compounds like soluble phenolics from aqueous and organic solvent solutions is gaining increasing interest in the recent years. This review does not pretend to cover the abundant published literature on the subject, but to be representative for the observed tendencies in membrane processes applications for concentration of polyphenols derived from natural products. The first part of the article includes general information regarding the polyphenols and the traditional methods for their separation (such as: thin layer chromatography; paper chromatography; gas chromatography; high performance liquid chromatography; capillary electrophoresis), while the second part presents a review of different membrane processes applied for concentration of polyphenols. Three main sources for such implementations are discussed: (1) aqueous or organic solvent extracts from plant material, (2) fruits, and (3) recovery of polyphenols from industrial waste liquids. A diversity of membrane processes are considered in a large scope of implementations ranging from lab-scale studies to pilot and semiindustrial scale operations. CONCLUSION: Membrane technology is an excellent candidate to make a paradigm shift in biological active compounds fractionation/separation processes. Presented results clearly demonstrate that membrane processes are of great advantages over traditionally used methods; however, characterization of separated polyphenols has to be improved. Most of citied authors concentrated their investigation only on the total amount of polyphenols determination. Exhaustive studies including: antioxidant activities, retention index, total soluble solids, or volume reduction factor, have been only carried out by a few authors.
[Mh] Termos MeSH primário: Fracionamento Químico/métodos
Membranas Artificiais
Polifenóis/isolamento & purificação
[Mh] Termos MeSH secundário: Cromatografia Gasosa
Cromatografia Líquida de Alta Pressão
Cromatografia em Papel
Cromatografia em Camada Delgada
Eletroforese Capilar
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Membranes, Artificial); 0 (Polyphenols)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180227
[Lr] Data última revisão:
180227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE
[do] DOI:10.2174/1381612822666161021124358


  8 / 9454 MEDLINE  
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[PMID]:28987410
[Au] Autor:Woods A; Kuntze K; Gelman F; Halicz L; Nijenhuis I
[Ad] Endereço:Department for Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ, Permoserstrasse 15, D-04318, Leipzig, Germany.
[Ti] Título:Variable dual carbon-bromine stable isotope fractionation during enzyme-catalyzed reductive dehalogenation of brominated ethenes.
[So] Source:Chemosphere;190:211-217, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The potential of compound-specific stable isotope analysis (CSIA) to characterize biotransformation of brominated organic compounds (BOCs) was assessed and compared to chlorinated analogues. Sulfurospirillum multivorans and Desulfitobacterium hafniense PCE-S catalyzed the dehalogenation of tribromoethene (TBE) to either vinyl bromide (VB) or ethene, respectively. Significantly lower isotope fractionation was observed for TBE dehalogenation by S. multivorans (ε = -1.3 ± 0.2‰) compared to D. hafniense (ε = -7.7 ± 1.5‰). However, higher fractionation was observed for dibromoethene (DBE) dehalogenation by S. multivorans (ε = -16.8 ± 1.8‰ and -21.2 ± 1.6‰ for trans- and cis-1,2- (DBE) respectively), compared to D. hafniense PCE-S (ε = -9.5 ± 1.2‰ and -14.5 ± 0.7‰ for trans-1,2-DBE and cis-1,2-DBE, respectively). Significant, but similar, bromine fractionation was observed for for S. multivorans (ε = -0.53 ± 0.15‰, -1.03 ± 0.26‰, and -1.18 ± 0.13‰ for trans-1,2-DBE, cis-1,2-DBE and TBE, respectively) and D. hafniense PCE-S (ε = -0.97 ± 0.28‰, -1.16 ± 0.36‰, and -1.34 ± 0.32‰ for cis-1,2-DBE, TBE and trans-1,2-DBE, respectively). Variable CBr dual-element slopes were estimated at Λ (ε /ε ) = 1.03 ± 0.2, 17.9 ± 5.8, and 29.9 ± 11.0 for S. multivorans debrominating TBE, cis-1,2-DBE and trans-1,2-DBE, respectively, and at 7.14 ± 1.6, 8.27 ± 3.7, and 8.92 ± 2.4 for D. hafniense PCE-S debrominating trans-1,2-DBE, TBE and cis-1,2-DBE, respectively. A high variability in isotope fractionation, which was substrate property related, was observed for S. multivorans but not D. hafniense, similar as observed for chlorinated ethenes, and may be due to rate-limiting steps preceding the bond-cleavage or differences in the reaction mechanism. Overall, significant isotope fractionation was observed and, therefore, CSIA can be applied to monitor the fate of brominated ethenes in the environment. Isotope effects differences, however, are not systematically comparable to chlorinated ethenes.
[Mh] Termos MeSH primário: Bromo/química
Carbono/química
Desulfitobacterium/metabolismo
Dibrometo de Etileno/metabolismo
Halogenação
[Mh] Termos MeSH secundário: Biotransformação
Isótopos de Carbono/química
Catálise
Fracionamento Químico
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbon Isotopes); 1N41638RNO (Ethylene Dibromide); 7440-44-0 (Carbon); SBV4XY874G (Bromine)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180215
[Lr] Data última revisão:
180215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171009
[St] Status:MEDLINE


  9 / 9454 MEDLINE  
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[PMID]:27773253
[Au] Autor:Jiang HL; Yang JL; Shi YP
[Ad] Endereço:Key Laboratory of Chemistry of Northwestern Plant Resources of CAS and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou 730000, PR China; University of Chinese Academy of Sciences, Beijing 100039, PR China.
[Ti] Título:Optimization of ultrasonic cell grinder extraction of anthocyanins from blueberry using response surface methodology.
[So] Source:Ultrason Sonochem;34:325-331, 2017 01.
[Is] ISSN:1873-2828
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Ultrasonic cell grinder extraction (UCGE), using water as the solvent, was firstly applied to extract anthocyanins from blueberry. Extraction yield was related with four variables, including ratio of solution to solid, extraction power, buffer time, and extraction time. On the basis of response surface methodology (RSM), the optimal conditions were determined to be the ratio of solution to solid as 25:1(mL/g), the extraction power as 1500W, the buffer time as 3.0s, and the extraction time as 40min. The experimental yield of anthocyanins using UCGE was 2.89mg/g higher than that of conventional ultrasound-assisted extraction (CUAE). This study indicated that UCGE was an innovative, efficient, and environment friendly method in ultrasonic extraction fields, and had a potential to effectively extract other bioactive constituents.
[Mh] Termos MeSH primário: Antocianinas/isolamento & purificação
Mirtilos Azuis (Planta)/química
Fracionamento Químico/métodos
Ondas Ultrassônicas
[Mh] Termos MeSH secundário: Reprodutibilidade dos Testes
Solventes/química
Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Anthocyanins); 0 (Solvents); 059QF0KO0R (Water)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180131
[Lr] Data última revisão:
180131
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  10 / 9454 MEDLINE  
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[PMID]:27773251
[Au] Autor:Chemat S; Aissa A; Boumechhour A; Arous O; Ait-Amar H
[Ad] Endereço:Extraction & Separation Techniques Team, Centre de Recherches Scientifique et Technique en Analyses Physico-Chimiques (C.R.A.P.C.), BP 248 Alger RP 16004, Algiers, Algeria. Electronic address: chemats@yahoo.fr.
[Ti] Título:Extraction mechanism of ultrasound assisted extraction and its effect on higher yielding and purity of artemisinin crystals from Artemisia annua L. leaves.
[So] Source:Ultrason Sonochem;34:310-316, 2017 01.
[Is] ISSN:1873-2828
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:This study proposes an ultrasound-horn system for the extraction of a natural active compound "artemisinin" from Artemisia annua L. leaves as an alternative to hot maceration technique. Ultrasound leaching improves artemisinin recovery at all temperatures where only ten minutes is required to recover 70% (4.42mgg ) compared to 60min of conventional hot leaching for the same yield. For instance, ultrasound treatment at 30°C produced a higher yield than the one obtained by conventional maceration at 40°C. Kinetic study suggests that the extraction pattern can be assimilated, during the first ten minutes, to a first order steady state, from which activation energy calculations revealed that each gram of artemisinin required 7.38kJ in ultrasound versus 10.3kJ in the conventional system. Modeling results indicate the presence of two extraction stages, a faster stage with a diffusion coefficient of 19×10 cm min for ultrasound technique at 40°C, seven times higher than the conventional one; and a second deceleration stage similar for both techniques with diffusion coefficient ranging from 1.7 to 3.1×10 cm min . It is noted that the efficient ultrasound extraction potential implies extraction of higher amount of co-metabolites so low artemisinin crystal purity is engendered but a combination with a purification step using activated charcoal and celite adsorbents produced crystals with comparable purity for conventional and ultrasound samples.
[Mh] Termos MeSH primário: Artemisia annua/química
Artemisininas/isolamento & purificação
Fracionamento Químico/métodos
Folhas de Planta/química
Ondas Ultrassônicas
[Mh] Termos MeSH secundário: Adsorção
Artemisininas/química
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Artemisinins); 9RMU91N5K2 (artemisinine)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180131
[Lr] Data última revisão:
180131
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE



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