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| Registros recuperados: 89 | |
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| Lampert, Luis; Hernandez Farinas, Tania. |
| La demande de la part de la Commission Européenne, pour inclure un Indice de Compositions (IC) dans l’indicateur « phytoplancton » de la Directive Cadre de l’Eau, a été prise en compte et un test en conditions réelle a été mené sur les données pigmentaires acquises entre 2016 et 2017. Deux échantillons par mois ont été analysés par chromatographie liquide (HPLC) sur 16 points, situés de la frontière belge et jusqu’au nord de la Loire. Cet indice (ICBC) a été bâti par la comparaison des moyennes pigmentaires de chaque point à une référence, via l’indice de similarité de Bray-Curtis. Cette référence (REF-Atl) a été définie comme la moyenne des deux points les moins impactées (Querqueville et Les Hébihens). La fréquence d’échantillonnage retenue est celle de... |
| Tipo: Text |
Palavras-chave: MANCHE; ATLANTIQUE; DCE; HPLC; PHYTOPLANCTON; INDICE DE COMPOSITION; ICBC. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00469/58110/60530.pdf |
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| Carrão-Panizzi,Mercedes Concórdia; Beléia,Adelaide Del Pino; Kitamura,Keisuke; Oliveira,Maria Cristina Neves. |
| The effects of genetics and environmental factors on isoflavone content of soybean (Glycine max L.) cultivars grown in different locations in Brazil in 1993/94 were evaluated. Seeds of different cultivars were analised by high performance liquid chromatography (HPLC). In Rio Grande do Sul (RS), Paraná (PR), and Mato Grosso do Sul (MS) States, a significant difference in the isoflavone total content average of the cultivars IAS 5 and FT-Abyara (163.9, 116.4 and 79.5 mg/100 g, respectively) was observed. In general, IAS 5 contained higher isoflavone than FT-Abyara. Cultivars IAS 5 and FT-Abyara grown at Vacaria, RS (28°30' S latitude) with temperature average of 19°C, had the highest isoflavone concentrations (218.7 and 163.8 mg/100 g, respectively). In... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Daidzin; Genistin; Crop location; HPLC. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999001000004 |
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| Souza,Adailson P. de; Prates,Hélio T.; Ferreira,Francisco A.; Reis,Efraim L.; Jordão,Claudio P.. |
| Em razão das poucas de informações existente na literatura, sobre a mobilidade do glyphosate e do imazapyr, em solos de baixa atividade, comum em países tropicais, foi conduzido, em laboratório, um estudo sobre a mobilidade vertical desses herbicida s em dois solos com diferente s composições químicas e fisicas. Para estudar essa mobilidade, foram utilizadas colunas de solo com diferentes alturas, as quais, após aplicação dos produtos na dose comerc ial de 4 L ha-1, foram submetida s a um regime hídrico de 40 mm h-1, por um período de 4 h. As análises dos resíduos nas diferentes profundidades foram feitas utilizando-se os métodos voltamétrico (polarografia) e HPLC, para o glyphosate e imazapyr, respectivame nte. Com base nos resultados, foi possível... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicidas; Voltametria; Polarografia; Cromatografia; HPLC. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83581999000200009 |
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| Matallo,M.B; Almeida,S.D.B; Cerdeira,A.L; Franco,D.A; Blanco,F.M.G; Menezes,P.T.C; Luchini,L.C; Moura,M.A.M; Duke,S.O. |
| A better method for determination of shikimate in plant tissues is needed to monitor exposure of plants to the herbicide glyphosate [N-(phosphonomethyl)glycine] and to screen the plant kingdom for high levels of this valuable phytochemical precursor to the pharmaceutical oseltamivir. A simple, rapid, and efficient method using microwave-assisted extraction (MWAE) with water as the extraction solvent was developed for the determination of shikimic acid in plant tissues. High performance liquid chromatography was used for the separation of shikimic acid, and chromatographic data were acquired using photodiode array detection. This MWAE technique was successful in recovering shikimic acid from a series of fortified plant tissues at more than 90% efficiency... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glyphosate; Green chemistry; Herbicide; HPLC. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582009000500012 |
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| MATOS,A.K.A.; CARBONARI,C.A.; VELINI,E.D.; GOMES,G.L.G.C.; TRINDADE,M.L.B.; MACEDO,G.C.. |
| ABSTRACT The objective of this study was to evaluate the availability of herbicides clomazone and tebuthiuron in the solution in different kinds of soils saturated with water or vinasse. Samples of 30 soils with different characteristics were arranged on trays to the herbicides spraying. Then they were homogenized, placed in plastic cartridges and saturated with deionized water or vinasse, and remaining at rest during 18 hours. Two extractions were made, the first one quantified the presence of the herbicides in the soil solution and in the second one the total extraction of herbicide remaining in the soil was taken to determine the recovery percentage of each herbicide tested. For quantification, a LC-MS/MS system was used, a compound of a high... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugarcane; Mass spectrometry; HPLC; Sorption. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000400771 |
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| Matallo,M.B.; Almeida,S.D.B.; Franco,D.A.S.; Cerdeira,A.L.; Gazzeiro,D.L.P.. |
| Oseltamivir phosphate is a potent viral inhibitor produced from shikimic acid extracted from seeds of Ilicium verum, the most important natural source. With the site of action 5-enolpyruvylshikimate-3-phosphate synthase (EPSP), glyphosate is the only compound capable of inhibiting its activity with the consequent accumulation of shikimic acid in plants. Corn and soybean plants were sprayed with reduced rates of glyphosate (0.0 to 230.4 g a.i. ha¹) and shikimic acid content in the dry mass was determined by HPLC 3, 7 and 10 days after application. Results showed shikimic acid accumulation in dry mass with increases of up to 969% in corn and 33,000% on soybeans, with peak concentrations 3 days after treatment (DAT). Industrial feasibility for shikimic acid... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicides; Corn; Soybean; Oseltamivir; Pandemics; HPLC. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300016 |
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| Bortoluzzi,Edson C.; Rheinheimer,Danilo dos S.; Gonçalves,Celso S.; Pellegrini,João B.R.; Zanella,Renato; Copetti,André C.C.. |
| Realizou-se este trabalho com o intuito de quantificar a presença de moléculas de agrotóxicos em águas superficiais de três unidades paisagísticas (UP) com diferentes configurações de uso, numa microbacia hidrográfica de cabeceira em Agudo, RS. Dois coletores semi-automáticos de água foram instalados no córrego de cada UP, onde se coletaram amostras, por ocasião de chuvas, em três épocas da cultura do fumo: transplante, aterramento junto aos pés da cultura (planta com 6-10 folhas) e colheita. Os princípios ativos imidacloprid, atrazina, simazina e clomazone foram quantificados por Cromatografia Líquida de Alta Eficiência com Detecção no Ultravioleta (HPLC-UV). Clorpirifós, flumetralin e iprodione foram analisados por Cromatografia Gasosa com Detecção por... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: SIG; Erosão; HPLC; Paisagem; Fumo. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662006000400015 |
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| CASTRO,ANA HORTÊNCIA FONSÊCA; YOUNG,MARIA CLÁUDIA MARX; ALVARENGA,AMAURI ALVES DE; ALVES,JOSÉ DONIZETI. |
| In order to evaluate the influence of photoperiod on the accumulation of allantoin in comfrey (Symphytum officinale L.), a well known medicinal plant, an experiment was conducted during July and August, 1998. Cuttings obtained from 90 day old plants were submitted to four photoperiods (8, 12, 16 and 20 hours). After 60 days, allantoin content in roots and rhizomes was evaluated. The results showed that increases in photoperiod promoted an increment in the average content of allantoin in roots (0.06%, 0.303%, 1.213% and 4.78%). On the other hand, in rhizomes, allantoin accumulation decreased (9.65%, 7.14%, 0.55%) when the photoperiod was increased from 8 to 12 and 16 hours, respectively, stabilizing on a 20-hour photoperiod (0.53%). Plants cultivated under... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: HPLC; Medicinal plant; Secondary metabolism; Symphytum officinale; Ureides. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000100006 |
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| OLIVEIRA,MARCELO ALVARES DE; CEREDA,MANRNEY PASCOLI; CABELLO,CLÁUDIO; URBANO,LUIZ HENRIQUE. |
| O objetivo deste trabalho foi identificar e quantificar os açúcares em frutos de pessegueiro da variedade 'Biuti', armazenados sob condições de ambiente (27,3ºC; 70% UR) e sob refrigeração (4ºC; 90%), comparar as diferenças entre os teores de açúcares nas duas condições de armazenamento. A identificação e a quantificação precisa dos açúcares (glicose, frutose e sacarose) foi realizada por cromatografia em fase líquida HPLC. Verificou-se que a sacarose foi o açúcar encontrado em maior quantidade, sendo verificado apenas traços de glicose e frutose em alguns frutos. Sob condições ambientais, os teores de sacarose do 3º até o 9º dia de armazenamento não diferiram significativamente entre si; entretanto, no 12º dia, os frutos obtiveram baixos teores de... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Armazenamento; HPLC; Sacarose; Frutose e glicose. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452001000200046 |
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| Couto Filho,Cristovão Colombo de Carvalho; Saliba,Eloísa de Oliveira Simões; Rodriguez,Norberto Mario; Barbosa,Geraldo Sérgio Senra Carneiro; Freitas,Regeane Martins de; Resende,Matheus Pinheiro Diniz. |
| The objective of this study was to evaluate the flow of nitrogenous compounds, protein degradability, rumen degradation of total carbohydrate and organic matter and microbial efficiency in heifers subjected to diets containing corn silage, sugarcane or Tifton. For this purpose, the 2,6-diaminopimelic acid (DAPA) technique was adopted and analytical procedures for amino acids by HPLC were adapted. Six rumen-fistulated Holstein-Zebu heifers with 480 kg of initial BW and at 24 months of age kept in individual tie stalls were assigned to two 3 × 3 Latin squares. Omasal digesta dry matter and microbial dry matter flows were determined using the isolated, purified and enriched lignin (LIPE®) and DAPA markers, respectively. Isolated bacteria from rumen showed on... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Corn silage; Flow of nitrogen compounds; HPLC; Microbial efficiency; Protein degradability; Sugarcane. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000500180 |
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| Moura,Guilherme de Souza; Lanna,Eduardo Arruda Teixeira; Filer,Keith; Falkoski,Daniel Luciano; Donzele,Juarez Lopes; Oliveira,Maria Goreti de Almeida; Rezende,Sebastião Tavares de. |
| The effects of enzyme complex SSF (solid state fermentation) on growth performance and the availability of sucrose and monosaccharides in the chyme of Nile were involved. The study included 360 fish (70g±4.43) in a completely randomized design with six dietary treatments (0, 50, 100, 150, 200 and 250 ppm of SSF) arranged in six replicates, with 10 fish per replicate. Every 15 days, one tilapia of each experimental unit was sacrificed for analyses of carbohydrate in the chyme. On day 60 of the experiment, the performance parameters were measured. There was a linear effect according to treatment for final weight and weight gain. For the other performance parameters, there were no differences. There was quadratic effect for sucrose and glucose in function of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquaculture; Enzymes; Fish nutrition; HPLC; Oreochromis niloticus. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000001 |
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| Morales-Trejo,F; Vega y León,S; Escobar-Medina,A; Pérez-González,J.J; Urbán-Carrillo,G; Gutiérrez-Tolentino,R. |
| Se desarrolló una metodología para la determinación de clenbuterol en hígado de bovino por cromatografía líquida de alta resolución (HPLC). La extracción se realizó con acetonitrilo e isopropanol. El extracto se analizó empleando una columna de fase reversa C18, un detector UV a 214 nm y una mezcla de NaH2PO4 0.05M (pH 3.0)/acetonitrilo (85:15, v/v) como fase móvil. El tiempo de retención para el clenbuterol fue 24.82 min. La recta de mejor ajuste de la curva de calibración del estándar fue y = 1340.8563x - 1539.7319, con un r²=0.9997 (p<0.05). Los límites de detección y de cuantificación mostraron valores de 0.9 y 1.8 ng/mL, respectivamente. Las medias de recuperación de clenbuterol fueron de 111.7, 82.0 y 84.8%, para tres niveles de concentración... |
| Tipo: Journal article |
Palavras-chave: Clenbuterol; HPLC; Validación; Hígado de bovino. |
| Ano: 2013 |
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S0253-570X2013000100006 |
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| Gutiérrez,R; Vega,S; Pérez,J.J; Ruiz,J.L; Yamazaki,A; Rivera,J.G; Urbán,Georgina; Escobar,A. |
| Con la finalidad de demostrar la inocuidad de la leche orgánica producida en Tecpatán, Chiapas, México, se determinó la presencia de aflatoxina M1 por cromatografía líquido de alta resolución (HPLC). Los resultados mostraron que el 23.3 % de las muestras sobrepasó el límite máximo de residuo propuesto por la regulación mexicana de 0.5 µg kg-1, mientras el 62.7% sobrepasaba el valor de 0.05 µg kg-1 de la UE. Los valores medios de aflatoxina M1 encontrados en la leche durante las épocas de seca y lluvia fueron de 3.53± 0.55 µg kg-¹ y 0.17 ± 0.13 µg kg-1 respectivamente. Los resultados corroboran que los productos orgánicos pueden estar expuestos a la presencia de contaminantes cuando no se cumplen las buenas prácticas agrícolas, afectando su inocuidad. |
| Tipo: Journal article |
Palavras-chave: Aflatoxina M1; Leche orgánica; México; HPLC. |
| Ano: 2013 |
URL: http://scielo.sld.cu/scielo.php?script=sci_arttext&pid=S0253-570X2013000100005 |
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| Registros recuperados: 89 | |
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