22 documents found, page 1 of 3
Profiling of lipophilic and phenolic phytochemicals of four cultivars from cher...
Santos, Sonia A. O.; Vilela, Carla; Camacho, Joao F.; Cordeiro, Nereida; Gouveia, Manuela; Freire, Carmen S. R.; Silvestre, Armando J. D.The lipophilic and phenolic extractives of the ripe mesocarp of four cherimoya cultivars ('Perry Vidal', 'Mateus I', 'Mateus III' and 'Funchal') from Madeira Island, were studied for the first time. The predominant lipophilic compounds are kaurene diterpenes (42.2-59.6%), fatty acids (18.0-35.6%) and sterols (9.6-23.7%). Kaur-16-en-19-oic acid is the major lipophilic component of all cultivars accounting betwee...
Quantification of 3-deoxyglucosone (3DG) as an aging marker in natural and forc...
Oliveira, Carla M.; Santos, Sonia A. O.; Silvestre, Armando J. D.; Barros, Antonio S.; Ferreira, Antonio C. S.; Silva, Artur M. S.The Maillard reaction product 3-deoxyglucosone (3DG) was quantified in wines, by high-performance liquid chromatography-mass spectrometry analysis after derivatization with ortho-phenylenediamine. Both sweet red Port wines and dry white wines were analysed during natural and forced aging. In natural aging, and for dry white wines, 3DG is negatively correlated to age (r=0.939), while for sweet red Port wines, 3D...
Bioprospecting for lipophilic-like components of five Phaeophyta macroalgae fro...
Santos, Sonia A. O.; Oliveira, Catia S. D.; Trindade, Stephanie S.; Abreu, Maria H.; Rocha, Silvia S. M.; Silvestre, Armando J. D.Lipophilic compounds present in dichloromethane extracts of five brown macroalgae from the Portuguese coast were analyzed by gas chromatography-mass spectrometry (GC-MS). Their dicarboxylic acids, long-chain aliphatic alcohols, and monoglyceride profile are reported for the first time. Additionally, other new compounds were also first reported: 24-methylene-cholesterol in Himanthalia elongata, Laminaria ochrole...
Chlorogenic acid-arabinose hybrid domains in coffee melanoidins: Evidences from...
Moreira, Ana S. P.; Coimbra, Manuel A.; Nunes, Fernando M.; Passos, Claudia P.; Santos, Sonia A. O.; Silvestre, Armando J. D.; Silva, Andre M. N.Arabinose from arabinogalactan side chains was hypothesized as a possible binding site for chlorogenic acids in coffee melanoidins. To investigate this hypothesis, a mixture of 5-O-caffeoylquinic acid (5-CQA), the most abundant chlorogenic acid in green coffee beans, and (alpha 1 -> 5)-L-arabinotriose, structurally related to arabinogalactan side chains, was submitted to dry thermal treatments. The compounds fo...
Modification of acid hydrolysis lignin for value-added applications by microniz...
Krutov, Stepan M.; Evtuguin, Dmitry V.; Ipatova, Elena V.; Santos, Sonia A. O.; Sazanov, Yurii N.Technical hydrolysis lignin (THL) was micronized by grinding in a rotary-jet mill to obtain a fraction of approximately 5 mm. Both initial and milled THLs were liquefied by thermal alkaline treatment at 220 degrees C for 2 h. Upgraded THLs that were nonmilled (L1) and milled (L2) were desalted by treatment with cation-exchanged resin and were dried. Micronization affected the course of hydrothermal alkaline tre...
Retama sphaerocarpa: An unexploited and rich source of alkaloids, unsaturated f...
Touati, Razika; Santos, Sonia A. O.; Rocha, Silvia M.; Belhamel, Kamel; Silvestre, Armando J. D.The chemical composition of the lipophilic extracts of the stems and grains of the shrub Retama sphaerocarpa was investigated by gas chromatography-mass spectrometry for the first time. Fatty acids is the major family of compounds in both morphological parts, representing between 37.1 and 85.1% of the total compounds detected, followed by sterols in stems and monoglycerides in grains. Considerable amounts of th...
The potential of cork from Quercus suber L. grown in Algeria as a source of bio...
Touati, Razika; Santos, Sonia A. O.; Rocha, Silvia M.; Belhamel, Kamel; Silvestre, Armando J. D.This study aimed to assess the lipophilic and phenolic extractives composition of cork of Quercus suber L. grown in Algeria by gas chromatography-mass spectrometry (GC-MS) and ultra-high-performance liquid chromatograhy-mass spectrometry (UHPLC-MS), respectively. The phenolic cork oak extract was also evaluated for its scavenging activity towards DPPH radical, ABTS radical scavenging, reducing power and antibac...
Chlorophyta and Rhodophyta macroalgae: A source of health promoting phytochemicals
Santos, Sonia A. O.; Vilela, Carla; Freire, Carmen S. R.; Abreu, Maria H.; Rocha, Silvia M.; Silvestre, Armando J. D.A detailed study of the lipophilic composition of Codium tomentosum, Ulva lactuca, Gracilaria vermiculophylla and Chondrus crispus macroalgae cultivated in the Portuguese coast was carried out by gas chromatography-mass spectrometry before and after alkaline hydrolysis. Their long-chain aliphatic alcohols and monoglycerides compositions are reported for the first time. Additionally, other new compounds were als...
Bioactive Phytochemicals from Wild Arbutus unedo L. Berries from Different Loca...
Fonseca, Daniela F. S.; Salvador, Angelo C.; Santos, Sonia A. O.; Vilela, Carla; Freire, Carmen S. R.; Silvestre, Armando J. D.; Rocha, Silvia M.The lipophilic composition of wild Arbutus unedo L. berries, collected from six locations in Penacova (center of Portugal), as well as some general chemical parameters, namely total soluble solids, pH, titratable acidity, total phenolic content and antioxidant activity was studied in detail to better understand its potential as a source of bioactive compounds. The chemical composition of the lipophilic extracts...
Phenolic composition and antioxidant activity of different morphological parts ...
Ramos, Patricia A. B.; Santos, Sonia A. O.; Guerra, Angela R.; Guerreiro, Olinda; Freire, Carmen S. R.; Rocha, Silvia M.; Duarte, Maria F.The phenolic composition of Cynara cardunculus L. var. altilis (DC) from south of Portugal was determined by analyzing the methanol/water/acetic acid (49.5:49.5:1) extracts of the different morphological parts of the plant, through high temperature-ultra high pressure liquid chromatography tandem mass spectrometry. From the twenty-eight phenolic compounds identified, eriodictyol hexoside was described for the f...