Effect of moderate electric fields in the permeation properties of chitosan coatings (2009)
Souza, B. W. S., Cerqueira, M. A., Casariego, A., Lima, A. M. P., Teixeira, J. A., Vicente, A. A.
Edible films and coatings can provide additional protection for food, while being a fully biodegradable, environmentally friendly packaging system. Preliminary works have shown that the presence of a...
Cerqueira, Miguel A., Souza, Bartolomeu W.S., Souza, Marthyna P., Teixeira, J. A., Vicente, A. A.
The effect of the concentrations of the polysaccharide from Anacardium occidentale L. (Policaju) and a surfactant (Tween 80) on relevant properties of edible coatings/films, in view of their...
Casariego, A., Souza, B. W. S., Cerqueira, M. A., Teixeira, J. A., Cruz, L., Díaz, R., ...
Blends of chitosan (from Cuban lobster) and clay micro/nanoparticles were prepared by dispersion of the clay particles in the film matrix and the films obtained were characterized in terms of water...
Suitability of novel galactomannans as edible coatings for tropical fruits (2009)
Cerqueira, M. A., Lima, A. M. P., Teixeira, J. A., Moreira, R. A., Vicente, A. A.
The main objective of this work was to determine the optimal composition of edible coatings in view of their application to extend the shelf life of several tropical fruits. Coatings constituted by...
Metabolomic evaluation of pulsed electric field-induced stress on potato tissue (2009)
Gómez Galindo, Federico, Dejmek, Petr, Lundgren, Krister, Rasmusson, Allan G., Vicente, A. A., Moritz, Thomas
Metabolite profiling was used to characterize stress responses of potato tissue subjected to reversible electroporation, providing insights on how potato tissue responds to a physical stimulus such...
Michelin, Michele, Silva, Daniel Pereira Da, Ruzene, Denise S., Vicente, A. A., Jorge, João A., ...
Fundação de Amparo à Pesquisa do Estado de São Paulo (Biota-FAPESP/Brazil )
Extraction, purification and characterization of galactomannans from non-traditional sources (2009)
Cerqueira, M. A., Pinheiro, Ana Cristina Dias, Souza, B. W. S., Lima, A. M. P., Ribeiro, Clara, Miranda, Cândida, ...
This work presents a methodology for the extraction of galactomannans from seeds of four different species of Leguminosae (Adenanthera pavonina, Caesalpinia pulcherrima, Gleditsia triacanthos and...
Functional polysaccharides as edible coatings for cheese (2009)
Cerqueira, M. A., Lima, A. M. P., Souza, B. W. S., Teixeira, J. A., Moreira, R. A., Vicente, A. A.
The objective of the present study was to apply the polysaccharides from different nontraditional sources for cheese coatings. Chitosan, galactomannan from Gleditsia triacanthos, and agar from...
Rojas, Edwin Elard Garcia, Vicente, A. A.
The objective of this study was to determine the thermodynamic parameters (ΔtrG, ΔtrH and ΔtrS) associated with lysozyme and conalbumin partitioning in aqueous two-phases systems (ATPS). Influence...
Matos, Gislaine Fernandes De, Teixeira, J. A., Silva, Daniel Pereira Da, Vicente, A. A., ...
O aumento do extrato inicial de fermentação e uso de adjuntos na substituição do malte vem sendo uma alternativa para diminuição de custos na produção de cervejas. Uma outra característica...
Michelin, Michele, Silva, Daniel Pereira Da, Ruzene, Denise S., Vicente, A. A., Jorge, João A., ...
Research into microbial xylanases production has increased due to its several applications. In this context, studies that make this practice feasible are important. Wheat bran is an inexpensive...
Mota, André, Silva, Daniel Pereira Da, Brányik, Tomáš, Vicente, A. A., Teixeira, J. A.
Fundação para a Ciência e Tecnologia (FCT)
Moderate electric fields can inactivate Escherichia coli at room temperature (2009)
Machado, L., Pereira, Ricardo, Martins, Rui C., Teixeira, J. A., Vicente, A. A.
The inactivation of Escherichia coli using moderate electric fields (MEF) below 25 °C, was investigated. Keeping the temperature always below 25 °C demonstrated that electric fields are involved in...
Exploring metabolic responses of potato tissue induced by electric pulses (2008)
Gómez Galindo, Federico, Wadsö, Lars, Vicente, A. A., Dejmek, Petr
In this study, we investigated the metabolic responses of potato tissue induced by pulsed electric field (PEF). Potato tissue was subjected to field strengths ranging from 30 to 500 V/cm, with a...
Hydrothermal treatments of corn cob and hemicelluloses extraction (2008)
Ruzene, Denise S., Yagiz, Elif, Marangoz, Dilek, Silva, Daniel Pereira Da, Vicente, A. A., Teixeira, J. A.
Corn cob samples were treated with water (autohydrolysis reaction) using a liquid to solid ratio of 10:1 w/w. The optimal condition for extraction of hemicelluloses was found at 185ºC for 30 min....
A new strategy for xylanase production using wheat straw autohydrolysis liquor as substrate (2008)
Michelin, Michele, Ruzene, Denise S., Silva, Daniel Pereira Da, Vicente, A. A., Jorge, João A., ...
Agro-industrial residues are lignocellulosic materials with a high content of cellulose, hemicellulose and lignin. If such residues can be produced in bioprocesses (e.g. xylanase production) there is...
Computational shelf-life dating : complex systems approaches to food quality and safety (2008)
Martins, Rui C., Lopes, Vítor V., Vicente, A. A., Teixeira, J. A.
Shelf-life is defined as the time that a product is acceptable and meets the consumers expectations regarding food quality. It is the result of the conjunction of all services in production,...
Phoon, Pui Yeu, Gómez Galindo, Federico, Vicente, A. A., Dejmek, Petr
Pulsed electric fields in combination with vacuum infusion have been utilized to impregnate cells with trehalose, aiming at substantially improving the freezing tolerance of spinach leaves. Spinach...
A new strategy for using banana as an ingredient in the brewing process (2008)
Carvalho, Giovani B. M., Silva, Daniel Pereira Da, Vicente, A. A., Teixeira, J. A.
Beer is a traditionally fermented beverage made from malted grains of barley, hops, yeast, and water, while banana is an important food crop cultivated widely in tropical and subtropical areas and is...
Banana : an alternative as adjunct and natural aromatic compound for beers (2008)
Carvalho, Giovani B. M., Silva, Daniel Pereira Da, Vicente, A. A., Teixeira, J. A.
Hemicelluloses fractions extraction of corn residue (2008)
Ruzene, Denise S., Yagiz, Elif, Marangoz, Dilek, Silva, Daniel Pereira Da, Vicente, A. A., Teixeira, J. A.
Fundação para a Ciência e a Tecnologia (FCT)
Differentiation of human pre-adipocytes by recombinant adiponectin (2008)
Avides, Maria Do Carmo, Domingues, Lucília, Vicente, A. A., Teixeira, J. A.
Obesity has become a global health problem and it is linked to a higher risk of diseases and metabolic disorders such as diabetes, cardiovascular disease, and cancer. The adipose tissue plays an...
Jozala, A. F., Silva, D. P., Vicente, A. A., Pessoa Júnior, Adalberto, Penna, T. C. V., Teixeira, J. A.
Nisin is a commercially available bacteriocin of the lantibiotic group produced by Lactococcus lactis ATCC 11454. The importance of nisin as an effective preservative is the fact that its spectrum of...
A review of flavour formation in continuous beer fermentations (2008)
Brányik, Tomáš, Vicente, A. A., Dostálek, Pavel, Teixeira, J. A.
The attractive prospect of a continuous beer fermentation system consists mostly of the accelerated transformation of wort into beer. Although continuous beer fermentation has been studied as a...
Silva, Daniel Pereira Da, Brányik, Tomáš, Giuliano, Giuliano, Vicente, A. A., Teixeira, J. A.
This study deals with two innovative brewing processes, high gravity batch and complete continuous beer fermentation systems. The results show a significant influence of the variables such as...
Martins, Rui C., Vicente, A. A., Teixeira, J. A., Lopes, Vítor V.
Os sistemas computacionais para a previsão da qualidade e segurança alimentar assumem hoje maior relevância na prototipagem e simulação da cadeia de distribuição (e.g. gestão do...
Carvalho, Giovani B. M., Silva, Daniel Pereira Da, Bento, Camila V., Vicente, A. A., Teixeira, J. A., ...
Traditionally, the raw materials for beer production are barley, hops, water, and yeast, but most brewers use also different adjuncts. During the alcoholic fermentation, the contribution of aroma...
The intensification of gas–liquid flows with a periodic, constricted oscillatory-meso tube (2007)
Reis, N., Mena, P. C., Vicente, A. A., Teixeira, J. A., Rocha, F. A.
The experimental study of gas dispersion in a vertical periodically, constricted, oscillatory meso-tube (OMT) is herein presented. Water was continuously pumped through the OMT in the laminar flow...
Complex systems in bioengineering : integrative approaches for biotechnology (2007)
Martins, Rui C., Lopes, Vítor V., Vicente, A. A., Teixeira, J. A.
Feasibility of yeasts and fungi monitoring during cheese maturation using fibre optic sensors (2007)
Silva, J. S. A., Jesus, P., Martins, Rui C., Vicente, A. A., Teixeira, J. A.
Alternative flows in a microfluidic device (2007)
Oliveira, Hugo Carneiro, Miranda, J. M., Teixeira, J. A., Vicente, A. A., Correia, J. H., Minas, Graça
The mixing properties of systems combining alternate flows with obstacles are studied by numerical methods. Preliminary results show that the layers of high and low solute concentration, created by...
Novel functional polysaccharides as edible coatings for cheese (2007)
Cerqueira, M. A., Lima, A. M. P., Vicente, A. A., Teixeira, J. A., Moreira, R. A.
One of the problems occurring during cheese ripening and later on, throughout the distribution chain, is the occurrence of molds and the loss of water. Usually, this problem is solved by the use of...
Casariego, A., Souza, B. W. S., Vicente, A. A., Teixeira, J. A., Cruz, L., Díaz, R.
Edible coatings can act as moisture, lipid, and gas barriers and can improve the textural properties of foods or serve as carriers of functional agents such as colors, flavors, antioxidants,...
Martins, Rui C., Borges, Sónia C., Lopes, Vítor V., Pereira, Ricardo, Vicente, A. A.
This study evaluates the effectiveness of UV-VIS-SWNIR spectroscopy of goat milk quality degradation during pasteurisation and ohmic heating, being performed on: i) raw goat milk; ii) non-processed...
Martins, Rui C., Coelho, A. M., Lopes, Vítor V., Pereira, Ricardo, Teixeira, J. A., Vicente, A. A.
Este estudo avalia a viabilidade da espectroscopia UVVIS- SWNIR na degradação da qualidade do leite de cabra durante a pasteurização e aquecimento Ohmico. Foram utilizados: i) leite de cabra cru;...
The bubble size distribution and O2 mass transfer in an oscillating, meso-scale tube (2007)
Reis, N., Mena, P. C., Rocha, F. A., Vicente, A. A., Teixeira, J. A.
This work aims at characterizing bubble size distribution and its control in a small-scale, constricted tube in the presence of an oscillating flow. From previous works, it became clear that the full...
Optimization of edible coating composition to retard strawberry fruit senescence (2007)
Ribeiro, Clara, Vicente, A. A., Teixeira, J. A., Miranda, Cândida
The ability of polysaccharide-based (starch, carrageenan and chitosan) coatings to extend the shelf-life of strawberry fruit (Fragaria ananassa) were studied, mainly for industrial applications. The...
Novel technologies for the thermal processing of foods (2007)
Heating is probably the oldest means of processing foods and has been used by mankind for millennia. However, the echnology used to heat foods in order to process them has had a spectacular evolution...
Edible coatings from galactomannans and their application to tropical fruits (2007)
Cerqueira, M. A., Lima, A. M. P., Moreira, H. H. T., Vicente, A. A., Teixeira, J. A., ...
Edible coatings play an important role in the quality and in the resistance to transportation, storage and display of a wide range of fresh and processed foods. Polysaccharide coatings with an...
Margarine quality monitoring based on reflectance spectroscopy (2007)
Martins, Rui C., Lopes, Vítor V., Vicente, A. A.
Margarine is a term that can indicate any of a wide range of butter substitutes. Due the raw material great diversity, margarine end-product quality characteristics are expected to be highly...
Ohmic heating treatment of fruit puree (2007)
Machado, L., Vicente, A. A., Teixeira, J. A., Miranda, F.
Ohmic heating is an alternative pasteurization process and is growing interest in industry. Understanding the influence of ohmic heating on the sensorial and microbiological quality of foods is a...
Pereira, Ricardo, Pereira, M., Teixeira, J. A., Vicente, A. A.
The effect of ohmic and conventional heat processing of different food products on their chemical and physical parameters was studied. Depending on the food being analysed, parameters such as pH,...
Casariego, A., Souza, B. W. S., Vicente, A. A., Teixeira, J. A., Cruz, L., Díaz, R.
The objectives of this work were to determine the effects of the concentrations of glycerol and sorbitol (as hydrophilic plasticizers), Tween 80 (as surfactant) and chitosan on the wettability of...
Pereira, Ricardo, Martins, Joana, Mateus, C., Teixeira, J. A., Vicente, A. A.
The influence of ohmic heating on the death kinetic parameters of Escherichia coli ATCC® 25922 in goat milk and spores of Bacillus licheniformis ATCC® 14580 in cloudberry jam was investigated and...
Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Lehnert, Radek, Dostálek, Pavel, ...
Despite extensive research carried out in the last few decades, continuous beer fermentation has not yet managed to outperform the traditional batch technology. An industrial breakthrough in favour...
Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Lehnert, Radek, Dostálek, Pavel, ...
Despite extensive research carried out in the last few decades, continuous beer fermentation has not yet managed to outperform the traditional batch technology. An industrial breakthrough in favour...
Complex systems challenges in bioengineering modelling and simulation (2006)
Martins, Rui C., Vicente, A. A., Teixeira, J. A.
Bioengineering has a considerable potential for the use of complex systems (CS) in modelling and simulation. Biological systems are built on functional elements, where the large variety of existing...
Proof-of-concept of a novel micro-bioreactor for fast development of industrial bioprocesses (2006)
Reis, N., Gonçalves, C. N., Vicente, A. A., Teixeira, J. A.
The experimental performance of a novel micro-bioreactor envisaged for parallel screening and development of industrial bioprocesses has been tested in this work. The micro-bioreactor with an...
Plant seed galactomannans as edible coatings (2006)
Cerqueira, M. A., Lima, A. M. P., Miranda, M. R. A., Moreira, H. H. T., Vicente, A. A., ...
Alfa-Valnatura; CNPq; CAPES; FUNCAP; UMinho; UFC.
Retarding strawberry fruit senesce with edible coatings : industrial application (2006)
Ribeiro, Clara, Vicente, A. A., Teixeira, J. A., Miranda, Cândida
Margarine products quality monitoring using reflectance UV-VIS-SWNIR spectroscopy (2006)
Martins, Rui C., Lopes, Vítor V., Vicente, A. A.
Fundação para a Ciência e a Tecnologia (FCT
Flavour formation in continuous fermentations (2006)
Brányik, Tomáš, Vicente, A. A., Dostálek, Pavel, Teixeira, J. A.
Fundação para a Ciência e a Tecnologia (FCT)
Oscillatory and alternate flows in a microfluidic device (2006)
Oliveira, Hugo Carneiro, Miranda, J. M., Teixeira, J. A., Vicente, A. A., Correia, J. H., Minas, Graça
The mixing properties of systems with oscillatory or alternate flows are studied by numerical methods. Preliminary results show that, for alternate flows, the contact area between high and low...
Lehnert, Radek, Brányik, Tomáš, Vicente, A. A., Dostálek, Pavel, Teixeira, J. A.
Grant Agency of the Czech Republic
The use of TIC’s as a managing tool for traceability in the food industry (2006)
Pinto, D. B., Castro, I., Vicente, A. A.
Food safety has become an important food quality attribute. Both food industry and authorities need to be able to trace back and to authenticate food products and raw materials used for food...
Ohmic heating in a food application : quality evaluation of cloudberry jam (2006)
Lindbom, Ingela, Kerry, J., Nunes, Helena Trindade, Pereira, Ricardo, Gallagher, Maria Jose Sousa, Staruch, Ladislav, ...
New techniques for food processing are areas of interest for the food industry and ohmic heating is an example of a new technique where there are many possible applications in the food area. The aim...
Reis, N., Gonçalves, C. N., Aguedo, Mário, Gomes, Nelma, Teixeira, J. A., Vicente, A. A.
A novel micro-bioreactor based on the oscillatory flow technology was applied to the scale-down of the biotechnological production of γ-decalactone. A decrease up to 50% of the time required to...
Effects of ohmic heating technology in chemical properties of foods (2006)
Pereira, Ricardo, Pereira, Marta Duarte, Teixeira, J. A., Vicente, A. A.
In this work some food products where characterised chemically before and after ohmic and conventional heating treatments, comparing both processes. In each food type (cloudberry jam, goat milk) pH...
Pereira, Ricardo, Martins, Joana, Mateus, C., Teixeira, J. A., Vicente, A. A.
In recent years, the world’s food industry has focused increasing attention on electrical techniques of food processing. Ohmic heating is one of these techniques that can be considered as a high...
Design of a lab-on-a-chip for clinical tests of human physiological fluids (2006)
Miranda, J. M., Minas, Graça, Vicente, A. A., Teixeira, J. A.
Labs-on-a-chip are useful to perform in situ clinical tests with instantaneous results. In this work, the design phase of the development of a lab-on-a-chip is presented. The device will be used to...
Yeast activity monitoring by fluorescent methods (2005)
Novak, J., Basarova, G., Fiala, J., Teixeira, J. A., Vicente, A. A.
Yeast activity was monitored during pilot plant yeast propagation under aerobic and anaerobic conditions. The work was carried out with three widely used Czech lager yeast strains. Fluorescent...
The challenging modelling of kLa in a periodic constricted small-scale tube (2005)
Reis, N., Vicente, A. A., Teixeira, J. A.
An extensive use in chemistry, biological and pharmaceutical laboratories is envisaged for a novel continuous screening reactor based on the oscillatory flow technology (Harvey, 2001). The basic unit...
Retarding strawberry fruit senesce with edible coatings : case study (2005)
Ribeiro, Clara, Vicente, A. A., Teixeira, J. A., Miranda, Cândida
The objectives of this work were to study the ability of starch, carrageenan and chitosan based coatings to extend the shelf life of strawberry fruit (Fragaria ananassa). To do so, the surface...
Fluid mechanics and design aspects of a novel oscillatory flow screening mesoreactor (2005)
Reis, N., Harvey, Adam, Mackley, M. R., Vicente, A. A., Teixeira, J. A.
A novel, continuous, oscillatory flow screening mesoreactor, composed of tubes with smooth periodic constrictions, is presented as a new option for small-scale reaction engineering applications,...
Continuous beer fermentation using immobilized yeast cell bioreactor systems (2005)
Brányik, Tomáš, Vicente, A. A., Dostálek, Pavel, Teixeira, J. A.
Traditional beer fermentation and maturation processes use open fermentation and lager tanks. Although these vessels had previously been considered indispensable, during the past decades they were in...
Continuous primary fermentation of beer : yeast immobilization kinetics and product quality (2005)
Brányik, Tomáš, Vicente, A. A., Teixeira, J. A.
A one stage continuous primary beer fermentation consisting of brewing yeast immobilized on spent grain particles in a gas lift reactor was studied. The goal of this work was to adjust the flavor of...
Klein, Jaroslav, Maia, J. M., Vicente, A. A., Domingues, Lucília, Teixeira, J. A., Juraščík, Martin
In this article a hydrodynamic and rheological analysis of a continuous airlift bioreactor with high-celldensity system is presented. A highly flocculating recombinant strain of Sacharomyces...
Castro, I., Teixeira, J. A., Vicente, A. A.
The production of ethanol and β-galactosidase from cheese whey and other sub-products from industries can be a good way of minimizing environmental problems and producing valuable products from...
Development of an applicattion to improve traceability and food safety management (2005)
Pinto, D. B., Castro, I., Vicente, A. A.
Food safety has become an important food quality attribute within the last decade. Facing recent food scandals taken up by the media, consumers are more and more concerned about and interested in the...
Reis, N., Teixeira, J. A., Vicente, A. A.
This paper demonstrates the effectiveness of using fibre optic micro-probes for the measurement of dispersion and mixing in continuous flow within a novel screening reactor operating under...
Afonso, Graciela D., Mota, Maria I., Pereira, Nilza A., Vicente, A. A.
Em indústrias de processamento de frutas, o estudo da distribuição dos tempos de residência (DTR) torna-se útil para determinar o melhor grau de mistura e garantir uma saída uniforme dos...
Aging of immobilized brewing yeast in a continuous bubble-column reactor (2005)
Brányik, Tomáš, Lehnert, Radek, Vicente, A. A., Teixeira, J. A.
The aim of this work was to study the physiological changes of immobilized brewing yeast Saccharomyces cerevisiae in a continuous reactor. Continuous cultivation was carried out at three different...
Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Teixeira, J. A.
Continuous beer fermentation offers a wide range of advantages, mostly of economic nature over the traditional batch process. However, due to increased complexity of operation comparing to batch...
Brányik, Tomáš, Silva, Daniel Pereira Da, Vicente, A. A., Ferreira, António Augusto, Dostálek, Pavel, ...
Although traditional batch overwhelmingly prevails over continuous fermentation, a breakthrough in quality and savings could be achieved by a simple, flexible and cheap fermentation system. This work...
Continuous primary fermentation of beer : yeast immobilization kinetics and product quality (2005)
Brányik, Tomáš, Vicente, A. A., Teixeira, J. A.
A one stage continuous primary beer fermentation consisting of brewing yeast immobilized on spent grain particles in a gas lift reactor was studied. The goal of this work was to adjust the flavor of...
Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.
Continuous food-sterilization processes often involve the flow of liquids or solid-liquid mixtures, frequently highly viscous and with non-Newtonian behaviour, in pipes and reactors. Heat treatment...
Brányik, Tomáš, Vicente, A. A., Teixeira, J. A.
Immobilization of brewing yeast onto a cellulosebased carrier obtained from spent grains, a brewing byproduct, by acid/base treatment has been studied in a continuously operating bubble-column...
Klein, Jaroslav, Vicente, A. A., Teixeira, J. A.
The magnetic tracer technique was used to obtain essential information on hydrodynamics, mixing and reactor design in a multiphase airlift reactor with an enlarged separator. The tracer method...
The use of fibre optic probes for flow monitoring within a small-scale tube (2004)
Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.
This paper demonstrates the effectiveness of using fibre optic micro-probes for the measurement of dispersion and mixing in continuous flow within small-scale tubes under oscillatory flow conditions....
Klein, Jaroslav, Maia, J. M., Juraščík, Martin, Vicente, A. A., Domingues, Lucília, Teixeira, J. A.
European Community programme Improving Human Research Potential.
CFD simulations of RTD of a strawberry pulp in a continuous ohmic heater (2004)
Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.
A pilot ohmic heater is to be tested for the continuous aseptic processing of strawberry pulps and jams. The hydrodynamics and the fluid residence time distribution (RTD) have been experimentally...
Klein, Jaroslav, Vicente, A. A., Maia, J. M., Domingues, Lucília, Teixeira, J. A.
In this paper a hydrodynamic and rheological analysis of a continuous airlift bioreactor with high cell density system is presented. A highly flocculating recombinant strain of Sacharomyces cerevisae...
Brányik, Tomáš, Vicente, A. A., Kuncová, Gabriela, Podrazký, Ondřej, Dostálek, Pavel, Teixeira, J. A.
In the continuous systems, such as continuous beer fermentation, immobilized cells are kept inside the bioreactor for long periods of time. Thus an important factor in the design and performance of...
Castro, I., Macedo, B., Teixeira, J. A., Vicente, A. A.
This work deals with the determination of the inactivation kinetics of several enzymes, most of them used as time-temperature integrators in the food industry. The tested enzymes were...
Castro, I., Teixeira, J. A., Salengke, S., Sastry, S. K., Vicente, A. A.
The effects of field strength and multiple thermal treatments on electrical conductivity of strawberry products were investigated. Electrical conductivity increased with temperature for all the...
Residence times and mixing of a novel continuous oscillatory flow screening reactor (2004)
Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.
This paper is concernedwith the fluidmechanics andmixing performance of a novel oscillatory flow screening reactor. Using fibre optic probes, a mixing coefficient k_m is determinedfor the system as a...
Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.
A one-stage continuous primary beer fermentation with immobilized brewing yeast was studied. The objective of the work was to optimize the operational conditions (aeration and temperature) in terms...
Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.
Neste trabalho efectuaram-se simulações numéricas dos padrões de fluxo num aquecedor óhmico contínuo, em estado estacionário, com recurso ao programa Fluent™. Para tal, criou-se uma grelha...
Residence times and mixing of a novel continuous oscillatory flow meso reactor (2004)
Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.
A novel meso reactor based on oscillatory flow technology (Harvey et al., 2001) has been recently presented in Harvey et al. (2003) as a new technology for reaction engineering and particle...
Enhanced mass transfer rates of a novel oscillatory flow screening reactor (2004)
Reis, N., Vicente, A. A., Teixeira, J. A., Mackley, M. R.
A novel continuous small-scale reactor based on the oscillatory flow technology (Harvey et al 2001) is being developed for application to specialist chemical manufacture and high throughput...
Klein, Jaroslav, Vicente, A. A., Domingues, Lucília, Juraščík, Martin, Teixeira, J. A.
One of the most common ways to improve the productivity of a fermentation process is the use of high cell density systems. In practice, such a system usually represents a threephase...
Castro, I., Reis, N., Teixeira, J. A., Vicente, A. A.
A pilot ohmic heater was tested for the continuous aseptic processing of strawberry pulp. The fluid mechanics and the fluid residence time distribution (RTD), in the whole volume of the vessel and...
Klein, Jaroslav, Vicente, A. A., Teixeira, J. A.
The hydrodynamic study of a three-phase airlift reactor with an enlarged head zone was carried out. Effects of gas-solid-liquid separator design and riser to downcomer cross-sectional area using...
Fluid mixing and particle suspension in a novel microreactor (2003)
Harvey, Adam, Mackley, M. R., Reis, N., Teixeira, J. A., Vicente, A. A.
Castro, I., Teixeira, J. A., Salengke, S., Sastry, S. K., Vicente, A. A.
The effects of field strength, soluble solids (from 14 to 59.5 ºBrix) and particle size (using two size distributions) on electrical conductivity were investigated. Electrical conductivity increased...
Klein, Jaroslav, Vicente, A. A., Teixeira, J. A.
The hydrodynamic study of a three-phase airlift (TPAL) bioreactor with an enlarged gas–liquid dual separator was carried out. Different lengths and diameters of the draft tube were tested to show...
Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.
Fundação para a Ciência e a Tecnologia (FCT) - SFRH / BPD / 3541 / 2000.
Klein, Jaroslav, Juraščík, Martin, Vicente, A. A., Teixeira, J. A.
European Community (EC) - Improving Human Research Potential - contract number MCFI-2001-01504.
Klein, Jaroslav, Vicente, A. A., Teixeira, J. A.
European Community (EC) - Improving Human Research Potential - Marie Curie Fellowship - contract number MCFI-2001-01504.
The fluid mechanics relating to a novel oscillatory flow micro reactor (2003)
Harvey, Adam, Mackley, M. R., Reis, N., Teixeira, J. A., Vicente, A. A.
Fundação para a Ciência e a Tecnologia (FCT) - scholarship SFRH/BD/6954/2001.
Continuous primary beer fermentation with brewing yeast immobilized on spent grains (2002)
Brányik, Tomáš, Schmidtová, J., Vicente, A. A., Cruz, José Machado, Teixeira, J. A.
Fundação para a Ciência e Technologia (FCT)
Klein, Jaroslav, Szíjjarto, Andrej, Vicente, A. A., Teixeira, J. A.
Fundação para a Ciência e a Tecnologia (FCT)
Continuous primary beer fermentation with brewing yeast immobilized on spent grains (2002)
Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.
This work demonstrated the technological feasibility of the three-phase airlift bioreactor (ALR) with brewing yeast immobilized on spent grains (a brewing by-product) for continuous beer production....
Comparative study of Selva and Camarosa strawberries for the commercial market (2002)
Castro, I., Gonçalves, O., Teixeira, J. A., Vicente, A. A.
Selva and Camarosa strawberry varieties were characterized chemically and physically. The importance of keeping the stem until processing, the influence of different transport periods under...
Continuous beer fermentation with brewing yeast immobilized on carrier made of spent grains (2002)
Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.
O ficheiro apresenta também a versão portuguesa publicada na página 41 do mesmo documento.
Dolgoš, Ondrej, Klein, Jaroslav, Vicente, A. A., Teixeira, J. A.
EU project Inco-Copernicus
Flocculation bioreactors : engineering based problems (2001)
Vicente, A. A., Teixeira, J. A.
The use of flocculation bioreactors is one of the most interesting ways to provide an increase of the productivity of biotechnological processes. As other high cell density systems, flocculation...
Spent grains : a new support for brewing yeast immobilisation (2001)
Brányik, Tomáš, Vicente, A. A., Cruz, José Machado, Teixeira, J. A.
A novel carrier obtained from spent grains, a brewing by-product, was used for brewing yeast immobilisation in a continuous bubble-column reactor. The multiple-layer cell adhesion to the carrier...
Aplicação de um sistema de análise de imagem à monitorização da fermentação (2000)
Costa, A. M., Vicente, A. A., Amaral, A. L., Ferreira, E. C., Teixeira, J. A., Cruz, José Machado
Applications of yeast flocculation in biotechnological processes (2000)
Domingues, Lucília, Vicente, A. A., Lima, Nelson, Teixeira, J. A.
A review on the main aspects associated with yeast flocculation and its application in biotechnological processes is presented. This subject is addressed following three main aspects – the basics...
Increase of ethanol productivity in an airlift reactor with a modified draught tube (1999)
Vicente, A. A., Dluhý, M., Teixeira, J. A.
Static mixers were introduced in the draught tube of a three-phase, concentric tube type airlift bioreactor, resulting in a 30% increase in ethanol productivity during glucose fermentation with a...
Vicente, A. A., Castrillo, Juan I., Teixeira, J. A., Ugalde, Unai
The amount of acid or base consumed in yeast cultures has been recently assigned to the pathway of nitrogen assimilation under respiratory conditions with no contribution by carbon metabolism...
Mass transfer properties of glucose and O2 in Saccharomyces cerevisiae flocs (1998)
Vicente, A. A., Dluhý, M., Ferreira, E. C., Mota, M., Teixeira, J. A.
The use of flocculent microorganisms in fermentations is a very promising application. However, it has some drawbacks of which the most important ones are related to mass transfer limitations within...
Modelling diffusion-reaction phenomena in yeast flocs of Saccharomyces cerevisiae (1998)
Vicente, A. A., Dluhý, M., Ferreira, E. C., Teixeira, J. A.
Limitations in the diffusion of substrates into the flocs will condition cell metabolic behaviour, having obvious consequences on growth and product formation. Polymeric additives have been used...
A new sampling device for measuring solids hold-up in a three-phase system (1997)
Vicente, A. A., Mota, M., Teixeira, J. A.
Measurement of solids hold-up in gas-liquid-solid systems was achieved by using a cylinder with a valve in each extremity, which allowed direct sampling inside the reactor causing minimal...
Vicente, A. A., Dluhý, M., Teixeira, J. A.
Yeast flocs are very fragile and cause problems when manipulations are needed. A new equipment for measuring kinetic and mass transfer parameters was developed and tested: the specific O2 uptake...
Vicente, A. A., Ferreira, E. C., Teixeira, J. A.
Flocculating cultures are one of the most interesting technologies to immobilise cells inside bioreactors. However, little is known about cell metabolism, viability and fermentation kinetics and...