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Registros recuperados: 49
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Aislamiento y caracterización bioquímica de metabolitos producidos por rizobacterias que solubilizan fosfato. Colegio de Postgraduados
Paredes Mendoza, Marianela.
El empleo de bacterias solubilizadoras de fosfato (BSP) para la solubilización de distintas rocas fosfatadas y de otras fuentes de fósforo es una alternativa para incrementar la cantidad de P disponible para las plantas. Se aislaron 147 BSP de la raíz y rizoplano de diferentes plantas cultivadas. El medio de cultivo denominado Medio Mínimo para Solubilización de Fosfato Colegio de Postgraduados con MgCl (MMSFCP-Mg) fue el más eficiente, debido a que en medio sólido se observaron halos de solubilización de hasta 3.8 cm a los catorce días, y en medio líquido se determinaron hasta 380 mg mL-1 de fosfato soluble a los seis días. Veintisiete de las mejores cepas fueron seleccionadas con base en la eficiencia de solubilización de fosfato...
Palavras-chave: Acidos orgánicos; Fosfatasas; Solubilización de fosfato; Inmunodetección; Roca fosfórica; Bacterias solubilizadoras de fosfato; Enfófitas; Organic acids; Phosphatases; Phosphate solubilization; Immunodetection; Rock phosphate; Phosphate solubilizing; Bacteria; Endophyte; Doctorado; Edafología.
Ano: 2010 URL: http://hdl.handle.net/10521/245
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Antioxidant potential and relation with chemical composition of wild edible mushrooms cap and stipe IPB - Escola Superior Agrária
Ribeiro, Bárbara; Lopes, Rosário; Andrade, P.B.; Seabra, R.M.; Gonçalves, Rui; Baptista, Paula; Valentão, P..
Tipo: ConferenceObject Palavras-chave: Organic acids; Phenolics composition; Alkaloids; Wild mushrooms.
Ano: 2008 URL: http://hdl.handle.net/10198/5736
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Antioxidative properties of tronchuda cabbage (Brassica oleraceae var. costata) external leaves against DPPH, superoxide radical, hydroxyl radical and hypochlorous acid IPB - Escola Superior Agrária
Vrchovska, V.; Sousa, C.; Valentão, P.; Ferreres, F.; Pereira, J.A.; Seabra, R.M.; Andrade, P.B..
The ability of the aqueous extract of tronchuda cabbage (Brassica oleracea L. var. costata DC) external leaves to act as a scavenger of DPPH- and reactive oxygen species (superoxide radical, hydroxyl radical and hypochlorous acid) was investigated. A phytochemical study was also undertaken, and thirteen phenolic compounds and five organic acids were identified and quantified. Tronchuda cabbage extracts exhibited antioxidant capacity in a concentration-dependent manner in all assays, although some pro-oxidant effect was also noticed. The samples with higher phenolic and organic acid contents displayed the major antioxidant potentials.
Tipo: Article Palavras-chave: Tronchuda cabbage; Brassica oleracea L. var. costata DC; DPPH; Superoxide radical; Hydroxyl radical; Hypochlorous acid; Phenolics; Organic acids.
Ano: 2006 URL: http://hdl.handle.net/10198/744
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Bioatividade de ácidos húmicos: efeitos sobre o desenvolvimento radicular e sobre a bomba de prótons da membrana plasmática. Repositório Alice
FAÇANHA, A.R.; FAÇANHA, A.L.O.; OLIVARES, F.L.; GURIDI, F.; SANTOS, G. de A.; VELLOSO, A.C.X.; RUMJANEK, V.M.; BRASIL, F.; SCHRIPSEMA, J.; BRAZ-FILHO, R.; OLIVEIRA, M.A de; CANELLAS, L.P..
A bioatividade de ácidos húmicos (AH) isolados de lodo da estação de tratamento de esgoto (AHL) e de vermicomposto (AHV) foi avaliada pela ação dessas substâncias sobre o transporte de prótons através da membrana plasmática de células de raízes de café e milho e sua relação com o desenvolvimento dessas espécies. Houve estímulo da área superficial radicular em ambas as espécies cultivadas com ambos AH, mostrando uma concentração ótima em torno de 40 mg L-1. Nessa condição, os tratamentos com AHL e AHV estimularam a H+-ATPase de membrana plasmática em plântulas de café e milho. Os AHL foram mais efetivos na promoção desses efeitos do que os AHV. A modificação do perfil cromatográfico dos AH em solução antes e após o cultivo das plântulas revelou que a...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Zea mays; Coffea arabica; Lodo residual; Ácidos orgânicos; Vermicomposto; Sewage sludge; Organic acids; Vermicomposting.
Ano: 2002 URL: http://www.alice.cnptia.embrapa.br/handle/doc/108732
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Brassica oleracea var. costata: comparative study on organic acids and biomass production with other cabbage varieties IPB - Escola Superior Agrária
Sousa, C.; Pereira, D.M.; Taveira, M.; Dopico-García, S.; Valentão, P.; Pereira, J.A.; Bento, Albino; Andrade, P.B..
BACKGROUND: A study was undertaken to evaluate the effect of agronomic practices, harvesting time and leaf age on the organic acid composition and biomass production of Brassica oleracea L. var. costata DC (tronchuda cabbage). Samples were cultivated under eight different fertilisation regimes (two levels each of nitrogen, boron and sulfur, an organic fertiliser and no fertiliser) and collected at three different times. RESULTS: Principal component analysis of the data indicated significant differences. Three principal components with an eigenvalue higher than one accounted for 79.0% of the total variance of the data set. Samples obtained with conventional fertilisation were characterised by the highest values of fresh weight. External leaves showed higher...
Tipo: Article Palavras-chave: Brassica oleracea L. var. costata DC; Organic acids; Fertilisation; Principal component analysis.
Ano: 2009 URL: http://hdl.handle.net/10198/3046
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Calidad e inocuidad de jitomate (Lycopersicum esculentum L.) fresco almacenado a diferentes temperaturas: relación del contenido de azúcares y ácidos orgánicos con la adherencia de Escherichia coli (ECET). Colegio de Postgraduados
Ibarra Cantún, Diego.
La inocuidad es un requisito importante de aceptación en el jitomate (Lycopersicum esculentum L.), para permitirle abrir nuevos mercados. En los que además, el fruto debe cumplir con ciertos estándares de calidad relacionados con sus propiedades físicas y químicas. El presente trabajo tuvo como objetivo determinar las propiedades físicas y químicas del fruto de jitomate almacenado a diferentes temperaturas en presencia de Escherichia coli (ECET). Se utilizaron frutos de jitomate variedad Charleston, cultivados en invernadero de hidroponía en el Municipio de Aquixtla, Puebla. Los frutos se sometieron a dos temperaturas de almacenamiento (7 y 22°C), inoculados con 7 log10UFC/mL de E. coli (ECET). Se evaluaron algunas propiedades físico-químicas como color,...
Palavras-chave: Azúcares; Acidos orgánicos; Adherencia; Lycopersicum esculentum; Adherence; Organic acids; Sugars; Estrategias para el Desarrollo Agrícola Regional; EDAR.
Ano: 2012 URL: http://hdl.handle.net/10521/1696
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Caracterização de acessos do banco de germoplasma de café da Epamig em relação ao ácido clorogênico, trigonelina e cafeína. Repositório Alice
SETOTAW, T. A.; NUNES, C. F.; SOUZA, C. S. de; SALGADO, S. L.; CARVALHO, G. R.; REZENDE, J. C. de; PEREIRA, A. A.; CANÇADO, G. M. de A..
O banco de germoplasma de café da EPAMIG contém acessos muito importantes para o programa de melhoramento de Coffea arabica, os quais necessitam de caracterização em relação aos ácidos orgânicos e cafeína. Portanto, esse trabalho objetivou avaliar 64 acessos de C. arabica, C. canephora var. Robusta e Híbrido de Timor mantidos no banco de germaplasma localizado na Fazenda Experimental da EPAMIG no município de Patrocínio/MG. A avaliação foi baseada na quantificação do ácido clorogênico, trigonelina e cafeína por meio da determinação empregando HPLC Perkins Elmer com ?UV/VIS detector?. Detectou-se variabilidade em relação ao ácido clorogênico, trigonelina e cafeína entre acessos de café arábica e os outros acessos do banco de germoplasma. Isso evidencia a...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Ácidos orgânicos; Cromatografia líquida de alta eficiência; Cafeína; Caffeine; Organic acids; Coffea arabica; High performance liquid chromatography.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1036538
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Characterization of grain mold resistant sorghum germplasm accessions for physio-morphological traits Open Agri
Thakur, R.P..
Palavras-chave: Grain; Germplasm; Fungi; Sorghum; Agronomic characters; Hybrids; Breeds (animals); Organic acids; Genetic resistance; Cereals.
Ano: 2008 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3143
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Chemical and antioxidative assessment of dietary turnip (Brassica rapa var. rapa) IPB - Escola Superior Agrária
Fernandes, F.; Valentão, P.; Sousa, C.; Pereira, J.A.; Seabra, R.M.; Andrade, P.B..
The phenolic compounds and organic acids of turnip (Brassica rapa var. rapa L.) edible parts (leaves and stems, flower buds and roots) were determined by HPLC–DAD and HPLC–UV, respectively. The results revealed a profile composed of 14 phenolics (3-p-coumaroylquinic, caffeic, ferulic and sinapic acids, kaempferol 3-O-sophoroside-7-O-glucoside, kaempferol 3-O-sophoroside-7-O-sophoroside, kaempferol 3-O-(feruloyl/caffeoyl)-sophoroside-7-O-glucoside, kaempferol 3,7-O-diglucoside, isorhamnetin 3,7-O-diglucoside, kaempferol 3-O-sophoroside, 1,2-disinapoylgentiobiose, 1,20-disinapoyl-2-feruloylgentiobiose, kaempferol 3-O-glucoside and isorhamnetin 3-O-glucoside) and six organic acids (aconitic, citric, ketoglutaric, malic, shikimic and fumaric acids). The...
Tipo: Article Palavras-chave: Turnip; Brassica rapa var. rapa L.; Phenolic compounds; Organic acids; Antioxidant activity.
Ano: 2007 URL: http://hdl.handle.net/10198/736
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Chemical assessment and in vitro antioxidant capacity of Ficus carica latex IPB - Escola Superior Agrária
Oliveira, A.P.; Silva, L.R.; Ferreres, F.; Pinho, P. Guedes de; Valentão, P.; Silva, B.M.; Pereira, J.A.; Andrade, P.B..
Ficus species possess latex-like material within their vasculatures, affording protection and selfhealing from physical attacks. In this work, metabolite profiling was performed on Ficus carica latex. Volatiles profile was determined by HS-SPME/GC-IT-MS, with 34 compounds being identified, distributed by distinct chemical classes: 5 aldehydes, 7 alcohols, 1 ketone, 9 monoterpenes, 9 sesquiterpenes and 3 other compounds. Sesquiterpenes constituted the most abundant class in latex (ca. 91% of total identified compounds). Organic acids composition was also characterized, by HPLC-UV, and oxalic, citric, malic, quinic, shikimic and fumaric acids were determined. Malic and shikimic acids were present in higher amounts (ca. 26%, each). The antioxidant potential...
Tipo: Article Palavras-chave: Ficus carica latex; Volatiles; Organic acids; Antioxidant potential; Acetylcholinesterase inhibition.
Ano: 2010 URL: http://hdl.handle.net/10198/3116
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Chemical composition and antioxidant activity of tronchuda cabbage internal leaves IPB - Escola Superior Agrária
Ferreres, F.; Sousa, C.; Vrchovska, V.; Valentão, P.; Pereira, J.A.; Seabra, R.M.; Andrade, P.B..
A phytochemical study was undertaken on the internal leaves of tronchuda cabbage (Brassica oleracea L. var. costata DC). Seventeen phenolic compounds were characterized and quantified by reversed-phase HPLCDAD-ESI-MSn and HPLC/DAD, respectively: quercetin 3-O-sophoroside-7-O-glucoside, 3-p-coumaroylquinic acid, kaempferol 3-O-sophoroside-7-O-glucoside, kaempferol 3-O-(caffeoyl)-sophoroside-7-O-glucoside, sinapoyl glucoside acid, kaempferol 3-O-(sinapoyl)-sophoroside-7-Oglucoside, kaempferol 3-O-(feruloyl)-sophoroside-7-Oglucoside, kaempferol 3-O-(p-coumaroyl)-sophoroside- 7-O-glucoside, 4-p-coumaroylquinic acid, sinapic acid, kaempferol 3-O-sophoroside, 3 isomeric forms of 1,2- disinapoylgentiobiose, 1-sinapoyl-2-feruloylgentiobiose,...
Tipo: Article Palavras-chave: Tronchuda cabbage internal leaves; Brassica oleracea L. var. costata DC; Phenolics; Organic acids; Antioxidant capacity.
Ano: 2006 URL: http://hdl.handle.net/10198/738
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Comparative study of phytochemicals and antioxidant potential of wild edible mushroom caps and stipes IPB - Escola Superior Agrária
Ribeiro, Bárbara; Lopes, Rosário; Andrade, P.B.; Seabra, R.M.; Gonçalves, Rui; Baptista, Paula; Quelhas, Inês; Valentão, P..
A comparative study of the organic acids and phenolics composition and of the total alkaloids content of entire wild edible mushrooms (Russula cyanoxantha, Amanita rubescens, Suillus granulatus and Boletus edulis) and correspondent caps and stipes was performed. All species presented oxalic, citric, malic and fumaric acids, with A. rubescens exhibiting the highest total organic acids content. Organic acids were preferably fixed in the cap. Among phenolics, only p-hydroxybenzoic acid was found in A. rubescens and S. granulatus, in very low amounts. B. edulis was the species that presented the highest total alkaloid amounts. Except for this species, alkaloids mainly accumulated in the cap. All of the species exhibited a concentration-dependent scavenging...
Tipo: Article Palavras-chave: Wild edible mushrooms; Alkaloids; Phenolic compounds; Organic acids; Antioxidant potential.
Ano: 2008 URL: http://hdl.handle.net/10198/4404
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Composição química e qualidade microbiológica de silagens ácidas de vísceras de surubim (Pseudoplatystoma spp.) preparadas com diferentes proporções de ácidos fórmico e cítrico. Infoteca-e
HISANO, H.; BORGHESI, R..
2015
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Resíduo orgânico; Ácido orgânico; Impacto ambiental; Residue; Organic acids; Environmental impact; By-product; Aquicultura.
Ano: 2015 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/1048642
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Contents of carboxylic acids and two phenolics and antioxidant activity of dried Portuguese wild edible mushrooms IPB - Escola Superior Agrária
Ribeiro, Bárbara; Rangel, Joana; Valentão, P.; Baptista, Paula; Seabra, R.M.; Andrade, P.B..
The organic acids and phenolics compositions of nine wild edible mushrooms species ( Suillus bellini, Tricholomopsis rutilans, Hygrophorus agathosmus, Amanita rubescens, Russula cyanoxantha, Boletus edulis, Tricholoma equestre, Suillus luteus, and Suillus granulatus) were determined by HPLC-UV and HPLC-DAD, respectively. The antioxidant potential of these species was also assessed by using the DPPH¥ scavenging assay. The results showed that all of the species presented a profile composed of at least five organic acids: oxalic, citric, malic, quinic, and fumaric acids. In a general way, the pair of malic plus quinic acids were the major compounds. Only very small amounts of two phenolic compounds were found in some of the analyzed species: p-hydroxybenzoic...
Tipo: Article Palavras-chave: Wild edible mushrooms; Organic acids; Phenolic compounds; Antioxidant potential.
Ano: 2006 URL: http://hdl.handle.net/10198/941
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Corn grain processing improves chemical composition and fermentative profile of rehydrated silage Animal Sciences
Silva, Marlon Richard Hilário da; Jobim, Clóves Cabreira; Neumann, Mikael; Osmari, Milene Puntel.
This study evaluated the effects of the rehydration and ensiling of corn grain with two geometric mean diameters (GMD) of 0.55 and 1.83 mm obtained by the diameter of the sieved used on the fermentation characteristics and chemical composition of the silage. The experimental design was completely randomized with two treatments and six replications, as follows: rehydrated fine-corn grain silage (RFS) and rehydrated coarse-corn grain silage (RCS). Ground corn was rehydrated with water to achieve moisture levels close to 350 g kg-1. There was no effect on the dry matter recovery, though the recovery rate was high, with values greater than 97% in both silages. The particle size influenced the fiber content, with lower values in the RFS. The acetic and lactic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Organic acids; Particle size; Processing grain; Storage losses..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/42564
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Effect of cutting and storage temperature on Packham's Triumph pears (Pyrus communis L.) Acta Agron. (Palmira)
Obando-Ulloa,Javier M.; Oyarzún,Alejandra; Machuca,Alejandra; Luchsinger,Luis; Peña-Neira,Álvaro; Escalona,Víctor H..
Abstract For the minimally processed (MP) fruit, the cutting type and temperature are the main factors in order to maintain good quality and appearance. The objective of this work was to evaluate the effects of cutting type and storage on the metabolic activity, color, firmness, aroma profile and, organic acid and sugar content of MP pears (Pyrus communis L. cv. Packham's Triumph). Whole fruits were washed, peeled and cut in wedges or dice. Then, the pieces were packaged in plastic containers and stored 8 days at 5 or 8 °C. The cutting type and storage temperature had an important effect on the physiological parameters, color, firmness and organic acid and sugar content. However, the aroma volatile content was reduced independently of the cutting type and...
Tipo: Journal article Palavras-chave: Aroma; Browning; Firmness; Organic acids; Sugar.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100039
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Effect of the conservation procedure on the contents of phenolic compounds and organic acids in Chanterelle (Cantharellus cibarius) Mushroom IPB - Escola Superior Agrária
Valentão, P.; Andrade, P.B.; Rangel, Joana; Ribeiro, Bárbara; Silva, B.M.; Baptista, Paula; Seabra, R.M..
To check the influence of the conservation procedure in the chemical composition of chanterelle mushroom, phenolic compounds and organic acids of samples preserved under four different conditions (drying, freezing, conservation in olive oil and in vinegar) were determined. Phenolics and organic acids were analyzed by HPLC-DAD and HPLC-UV, respectively. The results showed that chanterelle is characterized by the presence of six phenolic compounds (3-, 4-, and 5-O-caffeoylquinic acid, caffeic acid, p-coumaric acid, and rutin) and five organic acids (citric, ascorbic, malic, shikimic, and fumaric acids). Samples preserved in olive oil also exhibited hydroxytyrosol, tyrosol, luteolin, and apigenin, whereas conservation in vinegar led to the detection of...
Tipo: Article Palavras-chave: Chanterelle; Cantharellus cibarius; Conservation; Phenolic compounds; Organic acids.
Ano: 2005 URL: http://hdl.handle.net/10198/940
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Effects of easy soluble carbohydrate and bacterial inoculant supplementations on silage quality of frosted maize Animal Sciences
Konca, Yusuf; Beyzi, Selma Buyukkilic; Paffetti, Maria Asuncion Gallardo; Ulger, Ismail; Sohel, Mohammad Mahmodul Hasan.
The present experiments were conducted to assess the effects of barley, Lactobacillus bacteria and lactic acid bacteria (LAB) and enzyme mixture supplementations on chemical composition and some quality parameters of naturally frosted maize silage. The treatments were as follows; T1: Control (no supplementation, C); T2: barley 20 g kg-1, B20; T3: barley 40 g kg-1, B40; T4: 1.5 g ton-1, a mixture of LAB; and T5: 2 g ton1, a mixture LAB+enzyme, LEN. Barley supplementation to frosted maize increased dry matter (DM) (p < 0.01). The pH value was higher in LAB group (p < 0.01). Treatments supplemented LAB and LEN significantly reduced crude protein contents (p < 0.001). Lactic acid contents decreased in all treatments as compared to control group and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal Science Feed Science cold; Plant killing; Silage additives; Organic acids; Fleig point..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/39513
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Exsudatos radiculares de portaenxertos prunus. Repositório Alice
FERREIRA, L. V.; ANTUNES, L. E. C..
bitstream/item/165978/1/Luis-Eduardo-Revista-Cientifica-Rural-2017.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Exudation; Organic acids; Nitrogen.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1078708
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False positives for tannin sorghum in non-tannin sorghum using the bleach test Open Agri
Awika, J. McDonough, C.M..
Palavras-chave: Organic acids; Pigments; Sorghum; Phenols; Anthocyanins; Aromatic compounds; Sampling; Grain; Environmental degradation; Environmental factors.
Ano: 2005 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3240
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