The Experts below are selected from a list of 13545 Experts worldwide ranked by ideXlab platform
Jose Luis Cabezas - One of the best experts on this subject based on the ideXlab platform.
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solubility of some phenolic compounds contained in Grape Seeds in supercritical carbon dioxide
Journal of Supercritical Fluids, 2002Co-Authors: Ruth Murga, Sagrario Beltran, Maria Teresa Sanz, Jose Luis CabezasAbstract:Abstract The solubility of some natural, low molecular weight phenolic compounds, 3,4-dihydroxy benzoic acid (protocatechuic acid), methyl 3,4,5-trihydroxybenzoate (gallic acid methyl ester or methyl gallate), and 3,4-dihydroxy benzaldehyde (protocatechualdehyde), in supercritical carbon dioxide (SC-CO2) has been determined at pressures from 10 to 50 MPa and temperatures from 313 to 333 K. These phenolic compounds are contained in Grape Seeds and other natural substrates. The data presented in this work are valuable to know the possibility of separation from their natural matrices by supercritical extraction with carbon dioxide. Data modeling has been carried out by using the Peng–Robinson equation of state (PR-EOS) to describe the behavior of the supercritical fluid (SCF) phase. Two semiempirical density dependent correlations, specifically, the Chrastil model, and a model that assumes a linear correlation between the enhancement factor and the density of the solvent, have also been used for data correlation.
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extraction of natural complex phenols and tannins from Grape Seeds by using supercritical mixtures of carbon dioxide and alcohol
Journal of Agricultural and Food Chemistry, 2000Co-Authors: Ruth Murga, Rocio Ruiz, Sagrario Beltran, Jose Luis CabezasAbstract:Proanthocyanidins are supposed to have some therapeutical properties as antioxidants and antineoplasics. Most of the proanthocyanidins, however, are not commercialized since their separation from natural sources is either very expensive or not well-known. In this work, the feasibility of application of mixtures of carbon dioxide and alcohol under supercritical conditions for selective extraction of some phenolic compounds from Grape Seeds has been studied, among them some low polymerized proanthocyanidins, their main monomer units, (+)-catechin and (−)-epicatechin, and some low molecular weight phenolic compounds, like gallic acid. An analytical-scale supercritical fluid extractor, whose operation was previously optimized, was used to carry out the experiments. A commercial concentrate of complex phenols and tannins from Grape Seeds was subjected to supercritical extraction in order to find the best operation conditions before directly extracting defatted milled Grape Seeds. The solvent capacity was found...
Francisco J Heredia - One of the best experts on this subject based on the ideXlab platform.
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study of phenolic extractability in Grape Seeds by means of atr ftir and raman spectroscopy
Food Chemistry, 2017Co-Authors: Julio Nogalesbueno, Berta Bacabocanegra, Abigail Rooney, Jose Miguel Hernandezhierro, Hugh J Byrne, Francisco J HerediaAbstract:Near infrared hyperspectral imaging has been applied to Grape Seeds in order to select a representative subset of samples according to their spectral features in the 900-1700nm range. Afterwards, selected Grape Seeds have been classified according to their total phenol and flavanol extractabilities. In this way, samples were sorted in three different groups identified as low, medium and high extractability levels. In order to establish the chemical structures which can be responsible for the different extractabilities, vibrational spectroscopy has been applied to the non-extracted material after seed extractions. Attenuated total reflectance Fourier transform infrared (ATR-FTIR) and Raman spectra of non-extracted seed material have been recorded and their main spectral features have been linked to extractabilities of flavanolic and total phenolic compounds. The vibrational spectroscopic analysis confirms that Grape seed phenolic extractability is influenced by the cell wall composition (polysaccharides, lignins, pectins) and by the degree of esterification of pectins.
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preliminary study to determine the phenolic maturity stage of Grape Seeds by computer vision
Analytica Chimica Acta, 2012Co-Authors: Francisco J Rodriguezpulido, Raul Ferrergallego, Lourdes M Gonzalezmiret, Julian C Rivasgonzalo, Maria Teresa Escribanobailon, Francisco J HerediaAbstract:The applications of computer vision technology for acquiring and analysing images have been extended to the quality evaluation in food industry. This technique involves great advantages for the objective, rapid, non-contact and automated quality inspection and control. The aim of this work was to evaluate the potential of the computer vision to determine the phenolic maturity stage of Grape Seeds. Up to 21 phenolic compounds were determined by HPLC–DAD-MS in order to obtain reference values to develop the model. The CIELAB parameters, area, aspect, roundness, length, width and heterogeneity of Seeds were analysed using a DigiEye® system. The technique reported in this work can be a good and rapid tool for taking decisions at harvest time. Notwithstanding, a comprehensive study should be made in order to develop more robust models.
Ruth Murga - One of the best experts on this subject based on the ideXlab platform.
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solubility of some phenolic compounds contained in Grape Seeds in supercritical carbon dioxide
Journal of Supercritical Fluids, 2002Co-Authors: Ruth Murga, Sagrario Beltran, Maria Teresa Sanz, Jose Luis CabezasAbstract:Abstract The solubility of some natural, low molecular weight phenolic compounds, 3,4-dihydroxy benzoic acid (protocatechuic acid), methyl 3,4,5-trihydroxybenzoate (gallic acid methyl ester or methyl gallate), and 3,4-dihydroxy benzaldehyde (protocatechualdehyde), in supercritical carbon dioxide (SC-CO2) has been determined at pressures from 10 to 50 MPa and temperatures from 313 to 333 K. These phenolic compounds are contained in Grape Seeds and other natural substrates. The data presented in this work are valuable to know the possibility of separation from their natural matrices by supercritical extraction with carbon dioxide. Data modeling has been carried out by using the Peng–Robinson equation of state (PR-EOS) to describe the behavior of the supercritical fluid (SCF) phase. Two semiempirical density dependent correlations, specifically, the Chrastil model, and a model that assumes a linear correlation between the enhancement factor and the density of the solvent, have also been used for data correlation.
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extraction of natural complex phenols and tannins from Grape Seeds by using supercritical mixtures of carbon dioxide and alcohol
Journal of Agricultural and Food Chemistry, 2000Co-Authors: Ruth Murga, Rocio Ruiz, Sagrario Beltran, Jose Luis CabezasAbstract:Proanthocyanidins are supposed to have some therapeutical properties as antioxidants and antineoplasics. Most of the proanthocyanidins, however, are not commercialized since their separation from natural sources is either very expensive or not well-known. In this work, the feasibility of application of mixtures of carbon dioxide and alcohol under supercritical conditions for selective extraction of some phenolic compounds from Grape Seeds has been studied, among them some low polymerized proanthocyanidins, their main monomer units, (+)-catechin and (−)-epicatechin, and some low molecular weight phenolic compounds, like gallic acid. An analytical-scale supercritical fluid extractor, whose operation was previously optimized, was used to carry out the experiments. A commercial concentrate of complex phenols and tannins from Grape Seeds was subjected to supercritical extraction in order to find the best operation conditions before directly extracting defatted milled Grape Seeds. The solvent capacity was found...
David Gonzalezgomez - One of the best experts on this subject based on the ideXlab platform.
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in vitro estimation of the antibacterial activity and antioxidant capacity of aqueous extracts from Grape Seeds vitis vinifera l
Food Control, 2012Co-Authors: Jonathan Delgado Adamez, Esther Gamero Samino, Esperanza Valdes Sanchez, David GonzalezgomezAbstract:Abstract The aim of this work was to investigate the effect of Grape Seeds aqueous extracts on Gram-positive and Gram-negative bacteria and their antioxidant activity. Grape Seeds are considered a rich source of polyphenolic compounds that show antioxidant and antimicrobial effects. Grape Seeds extracts were tested for antibacterial activity by minimum inhibitory concentration method, finding that the inhibitory effect of phenolic compounds from Seeds extracts are more potent against Gram-positive bacteria than Gram-negative. The antioxidant capacity of the Seeds extracts depends on the content of total polyphenol compounds, and this antioxidant activity and antibacterial capacity were observed to be lower when extracts were obtained from Seeds after making of wine. Our results suggest that the use of Grape seed extract is a feasible alternative as antibacterial and antioxidant agents to prevent the deterioration of stored foods by bacteria and oxidation.
Sagrario Beltran - One of the best experts on this subject based on the ideXlab platform.
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solubility of some phenolic compounds contained in Grape Seeds in supercritical carbon dioxide
Journal of Supercritical Fluids, 2002Co-Authors: Ruth Murga, Sagrario Beltran, Maria Teresa Sanz, Jose Luis CabezasAbstract:Abstract The solubility of some natural, low molecular weight phenolic compounds, 3,4-dihydroxy benzoic acid (protocatechuic acid), methyl 3,4,5-trihydroxybenzoate (gallic acid methyl ester or methyl gallate), and 3,4-dihydroxy benzaldehyde (protocatechualdehyde), in supercritical carbon dioxide (SC-CO2) has been determined at pressures from 10 to 50 MPa and temperatures from 313 to 333 K. These phenolic compounds are contained in Grape Seeds and other natural substrates. The data presented in this work are valuable to know the possibility of separation from their natural matrices by supercritical extraction with carbon dioxide. Data modeling has been carried out by using the Peng–Robinson equation of state (PR-EOS) to describe the behavior of the supercritical fluid (SCF) phase. Two semiempirical density dependent correlations, specifically, the Chrastil model, and a model that assumes a linear correlation between the enhancement factor and the density of the solvent, have also been used for data correlation.
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extraction of natural complex phenols and tannins from Grape Seeds by using supercritical mixtures of carbon dioxide and alcohol
Journal of Agricultural and Food Chemistry, 2000Co-Authors: Ruth Murga, Rocio Ruiz, Sagrario Beltran, Jose Luis CabezasAbstract:Proanthocyanidins are supposed to have some therapeutical properties as antioxidants and antineoplasics. Most of the proanthocyanidins, however, are not commercialized since their separation from natural sources is either very expensive or not well-known. In this work, the feasibility of application of mixtures of carbon dioxide and alcohol under supercritical conditions for selective extraction of some phenolic compounds from Grape Seeds has been studied, among them some low polymerized proanthocyanidins, their main monomer units, (+)-catechin and (−)-epicatechin, and some low molecular weight phenolic compounds, like gallic acid. An analytical-scale supercritical fluid extractor, whose operation was previously optimized, was used to carry out the experiments. A commercial concentrate of complex phenols and tannins from Grape Seeds was subjected to supercritical extraction in order to find the best operation conditions before directly extracting defatted milled Grape Seeds. The solvent capacity was found...
