Rui M.A. Domingues
University of Aveiro
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Publication
Featured researches published by Rui M.A. Domingues.
Journal of Agricultural and Food Chemistry | 2009
Juan José Villaverde; Rui M.A. Domingues; Carmen S.R. Freire; Armando J.D. Silvestre; C. Pascoal Neto; Pablo Ligero; A. Vega
The chemical composition of the lipophilic extracts of bark and core, of the Miscanthus x giganteus stalk, was studied by gas chromatography-mass spectrometry (GC-MS). Aromatic compounds, sterols, and fatty acids, followed by long-chain fatty alcohols, were the major families of components present in the M. x giganteus stalk. Aromatic compounds are more abundant in the M. x giganteus bark (521 mg/kg of bark), with vanillic acid, vanillin, and p-hydroxybenzaldehyde as the major compounds of this family. In the M. x giganteus core, sterols represent about 949 mg/kg of dry core with beta-sitosterol, 7-oxo-beta-sitosterol, stigmasterol, and campesterol as the major components. The detection of small amounts of esters in the GC-MS analysis with short columns explains the small increase in the abundance of the identified families after alkaline hydrolysis. The high content of valuable sterols and aromatic compounds in M. x giganteus and, particularly, in the core, which is considered a residue in most applications, can open new perspectives for the integrated upgrading of this grass within the biorefinery perspective.
International Journal of Molecular Sciences | 2012
Rui M.A. Domingues; Eduardo L.G. Oliveira; Carmen S.R. Freire; Ricardo M. Couto; Pedro Simões; Carlos Neto; Armando J.D. Silvestre; Carlos M. Silva
Eucalyptus bark contains significant amounts of triterpenoids with demonstrated bioactivity, namely triterpenic acids and their acetyl derivatives (ursolic, betulinic, oleanolic, betulonic, 3-acetylursolic, and 3-acetyloleanolic acids). In this work, the supercritical fluid extraction (SFE) of Eucalyptus globulus deciduous bark was carried out with pure and modified carbon dioxide to recover this fraction, and the results were compared with those obtained by Soxhlet extraction with dichloromethane. The effects of pressure (100–200 bar), co-solvent (ethanol) content (0, 5 and 8% wt), and multistep operation were studied in order to evaluate the applicability of SFE for their selective and efficient production. The individual extraction curves of the main families of compounds were measured, and the extracts analyzed by GC-MS. Results pointed out the influence of pressure and the important role played by the co-solvent. Ethanol can be used with advantage, since its effect is more important than increasing pressure by several tens of bar. At 160 bar and 40 °C, the introduction of 8% (wt) of ethanol greatly improves the yield of triterpenoids more than threefold.
Industrial Crops and Products | 2010
Rui M.A. Domingues; Gabriel Sousa; Carmen S.R. Freire; Armando J.D. Silvestre; C. Pascoal Neto
Industrial Crops and Products | 2011
Rui M.A. Domingues; Gabriel Sousa; Carlos M. Silva; Carmen S.R. Freire; Armando J.D. Silvestre; C. Pascoal Neto
Journal of Supercritical Fluids | 2013
Rui M.A. Domingues; Marcelo M.R. de Melo; Eduardo L.G. Oliveira; Carlos Pascoal Neto; Armando J.D. Silvestre; Carlos M. Silva
Industrial Crops and Products | 2013
D.J.S. Patinha; Rui M.A. Domingues; Juan José Villaverde; Armandina Silva; Carlos M. Silva; Carmen S.R. Freire; C. Pascoal Neto; Armando J.D. Silvestre
Journal of Supercritical Fluids | 2012
Rui M.A. Domingues; Marcelo M.R. de Melo; Carlos Pascoal Neto; Armando J.D. Silvestre; Carlos M. Silva
Mini-reviews in Organic Chemistry | 2014
Rui M.A. Domingues; Angela R. Guerra; Maria F. Duarte; Carmen S.R. Freire; Carlos Pascoal Neto; Carlos Silva; Arnando J.D. Silvestre
Archive | 2011
Rui M.A. Domingues; David J.S. Patinha; Gabriel Sousa; Juan José Villaverde; Carlos M. Silva; Carmen S.R. Freire; Armando J.D. Silvestre; C. Pascoal Neto; S. Francisco
Journal of Supercritical Fluids | 2014
M.M.R. de Melo; Rui M.A. Domingues; M. Sova; E. Lack; H. Seidlitz; F. Lang; Armando J.D. Silvestre; Carlos M. Silva