11 documents found, page 1 of 2
Optimization of xanthan gum production by demerara sugar using response surface...
Ramos, Larissa Castor; Jesus, Meirielly Santos; Pires, Preciosa; Fontes-Junior, Alberto S.; Nunes, Erica S.; Santos, Klebson S.; Teixeira, J. A.Xanthan gum (XG) production using three Xanthomonas sp. strains (290, 472, and S6) was evaluated by applying a 23 full factorial central composite design response to study the interactive effects of the fermentation medium component concentrations as parameters to determine the efficiency of the gum production in batch experiments. The experimental variables were the carbon source (demerara sugar or sucrose), p...
Ohmic heating polyphenolic extracts from vine pruning residue with enhanced bio...
Jesus, Meirielly Santos; Ballesteros, Lina F.; Pereira, Ricardo Nuno Correia; Genisheva, Zlatina; Carvalho, Ana S.; Pereira-Wilson, CristinaVine Pruning residue was submitted to conventional heating and ohmic heating (OH) for the extraction of bioactive compounds and analyzed for total phenolic content (TPC), polyphenolic profile, antioxidant activity, antimicrobial activity and anticancer activity. The OH extracts were obtained using Low electric field (496.0 V/cm) or Intermediate electric field - IEF (840.0 V/cm). The tests were performed using 4...
Ohmic heating extract of vine pruning residue has anti-colorectal cancer activi...
Jesus, Meirielly Santos; Carvalho, Ana C.; Teixeira, J. A.; Domingues, Lucília; Pereira-Wilson, CristinaVine pruning residues are by-products of the wine industry that have not received much attention in the past, in spite of being rich in bioactive compounds. In this study, we aimed to test whether an ohmic extract of vine pruning residue (VPE) has anti-colorectal cancer (CRC) properties, and whether responses differ according with cell’s mutation profile. VPE decreased human CRC cell proliferation, accompanied ...
Bioactive compounds recovery optimization from vine pruning residues using conv...
Jesus, Meirielly Santos; Genisheva, Zlatina; Romani, Aloia Perez; Pereira, Ricardo Nuno Correia; Teixeira, J. A.; Domingues, LucíliaPolyphenol compounds from vine pruning residue (VPR) were extracted by conventional heating and microwave-assisted treatments. For each treatment, total phenolic compounds and their antioxidant activity were optimized by experimental design. Maximal extraction of polyphenolic compounds (2.17g/100g VPR) was obtained at 80°C, 120min and 45% of ethanol by conventional heating, and 2.37g/100g of VPR were extracted ...
A biorefinery approach for valorization of vine pruning residue
Jesus, Meirielly SantosO continente europeu é considerado o maior produtor mundial de vinho e apresenta uma grande biodiversidade de castas e alto potencial de mercado. No entanto, ao longo dos diferentes estágios do processo de produção de vinho, muitos resíduos são gerados (resíduo de poda de videira-VPR, engaço e bagaço) e geralmente não são utilizados, sendo descartados. Portugal gera anualmente cerca de 178 mil toneladas de resí...
Extraction of bioactive compounds from vine pruning residues by using ohmic hea...
Jesus, Meirielly Santos; Ballesteros, Lina F.; Pereira, Ricardo Nuno Correia; Genisheva, Zlatina; Teixeira, J. A.; Domingues, LucíliaVine pruning residue (VPR), a waste from the wine production, has attracted the interest of chemical and food industries thanks to its great potential as a raw material to obtain bioactive compounds. Due to the high market price of these compounds, different technologies have been studied to improve the economic profitability of their obtaining process. Therefore, the objective of this work was to evaluate an e...
Hydroalcoholic extraction of polyphenol compounds assisted by a microwave diges...
Jesus, Meirielly Santos; Genisheva, Zlatina; Romani, Aloia Perez; Pereira, Ricardo N.; Teixeira, J. A.; Domingues, LucíliaThe interest on the valorization of by-products from the wine industry has significantly increased over the years due to environmental and economic issues1 . Among these by-products, residues obtained from the pruning of vine are lignocellulosic materials with an important percentage of extractives composed by bioactive compounds as phenolic compounds13. In this context, the objective of this work was the extra...
Integral valorization of vine pruning residue by sequential autohydrolysis stages
Jesus, Meirielly Santos; Romaní, Aloia; Genisheva, Zlatina; Teixeira, J. A.; Domingues, LucíliaWine processing generates a large amount of residue, in particular pruning residue of vine. In this work, autohydrolysis in two sequential stages was proposed for the integral valorization of this residue. In a first stage, vine pruning residue was submitted to autohydrolysis treatment at 180 °C for 60 min (severity of 4.13) and liquid to solid ratio of 6 g water per g vine pruning residue. In these conditions,...
Extraction of polyphenols from vine pruning residues optimization
Jesus, Meirielly Santos; Genisheva, Zlatina; Romaní, Aloia; Teixeira, J. A.; Domingues, LucíliaVine pruning residue (VPR) is a by-product obtained after annual pruning of vines, abundant in Portugal, and a natural source of compounds with antioxidant activity. In a previous work, an integral valorization of this residue was proposed in which 13.7 kg of xylooligosaccharides, 3.1 kg of phenolic compounds, 13.1 kg of ethanol and 27 kg of lignin per 100 kg of vine pruning residue were extracted[1]. Here, we ...
Bioethanol production from vine pruning residue by sequential steps of autohydr...
Romaní, Aloia; Jesus, Meirielly Santos; Teixeira, J. A.; Domingues, LucíliaLignocellulosic biomass is a renewable raw material, widespread and with a huge potential for the manufacture of biofuels as bioethanol. In Portugal, the most abundant exploitable lignocellulosic biomass derives from the agro-industrial and forestry sectors. Large amounts of residues are generated during wine processing, specially pruning residues of vine. Approximately 1.2-3.5 t/ha of vine pruning residues (VP...