33 documents found, page 1 of 4
A realistic scenario on microalgae based biodiesel production: third generation...
Ananthi, V.; Raja, Rathinam; Carvalho, Isabel Saraiva de; Brindhadevi, Kathirvel; Pugazhendhi, Arivalagan; Arun, A.Microalgae are the widely employed sources of third generation biofuels, which attracted huge attention by the researchers of the present decade because of their great productivity with lipid content. But to date, the utilization of microalgae for renewable biofuel production is not considered economically viable. The various growth modes employed for microalgal cultivation, such as phototrophic, heterotrophic,...
Phenolics extraction from sweet potato peels: modelling and optimization by res...
Anástacio, Ana; Silva, Ruben; Carvalho, Isabel Saraiva deSweet potato peels (SPP) are a major waste generated during root processing and currently have little commercial value. Phenolics with free radical scavenging activity from SPP may represent a possible added-value product for the food industry. The aqueous extraction of phenolics from SPP was studied using a Central Composite Design with solvent to solid ratio (30-60 mL g(-1)), time (30-90 min) and temperature ...
Effect of Betula pendula leaf extract on alpha-glucosidase and glutathione leve...
Bljajic, Kristina; Sostaric, Nina; Petlevski, Roberta; Vujic, Lovorka; Brajkovic, Andrea; Fumic, Barbara; Carvalho, Isabel Saraiva deB. pendula leaf is a common ingredient in traditional herbal combinations for treatment of diabetes in southeastern Europe. Present study investigated B. pendula ethanolic and aqueous extract as inhibitors of carbohydrate hydrolyzing enzymes, as well as their ability to restore glutathione concentration in Hep G2 cells subjected to glucose-induced oxidative stress. Phytochemical analysis revealed presence of ru...
Modelling of mass transfer kinetic in osmotic dehydration of kiwifruit
Jabrayili, Sharokh; Farzaneh, Vahid; Zare, Zahra; Bakhshabadi, Hamid; Babazadeh, Zahra; Mokhtarian, Mohsen; Carvalho, Isabel Saraiva deOsmotic dehydration characteristics of kiwifruit were predicted by different activation functions of an artificial neural network. Osmotic solution concentration (y(1)), osmotic solution temperature (y(2)), and immersion time (y(3)) were considered as the input parameters and solid gain value (x(1)) and water loss value (x(2)) were selected as the outlet parameters of the network. The result showed that logarit...
Screening of the aerodynamic and biophysical properties of barley malt
Ghodsvali, Alireza; Farzaneh, Vahid; Bakhshabadi, Hamid; Zare, Zahra; Karami, Zahra; Mokhtarian, Mohsen; Carvalho, Isabel Saraiva deAn understanding of the aerodynamic and biophysical properties of barley malt is necessary for the appropriate design of equipment for the handling, shipping, dehydration, grading, sorting and warehousing of this strategic crop. Malting is a complex biotechnological process that includes steeping; ger-mination and finally, the dehydration of cereal grains under controlled temperature and humidity conditions. In...
Recent developments in therapeutic applications of Cyanobacteria
Raja, Rathinam; Hemaiswarya, Shanmugam; Ganesan, Venkatesan; Carvalho, Isabel Saraiva deThe cyanobacteria (blue-green algae) are photosynthetic prokaryotes having applications in human health with numerous biological activities and as a dietary supplement. It is used as a food supplement because of its richness in nutrients and digestibility. Many cyanobacteria (Microcystis sp, Anabaena sp, Nostoc sp, Oscillatoria sp., etc.) produce a great variety of secondary metabolites with potent biological a...
Effect of Erica australis extract on Caco-2 cells, fibroblasts and selected pat...
Nunes, Ricardo; Rodrigues, Susana; Pasko, Pawel; Tyszka-Czochara, Malgorzata; Grenha, Ana; Carvalho, Isabel Saraiva dePlants from the genus Erica are used in many countries to treat several ailments. In this work we intend to evaluate the potential in vivo benefits of Erica australis L. by testing in vitro the effect induced by the plant extract when in contact with BJ fibroblasts (3 and 9 hours) and Caco-2 cells (3, 6 and 24 hours). Effects on five pathogenic microorganisms(Enterococcus faecalis, Bacillus cereus, Escherichia ...
In vitro antioxidant activity, phenolic compounds and protective effect against...
Silva, R.; Carvalho, Isabel Saraiva deThis study analyzed the antioxidant properties of Portulaca oleracea L., known as purslane. The samples (leaves, flowers and stems) were collected at two different locations in Portugal: Tavira (L1) and Vendas Novas (L2). Assays for total antioxidant activity, total phenolic content and ferric-reducing antioxidant power were conducted and, for both locations, significantly higher values (P<0,05) were observed f...
Microalgae taxonomy and breeding
Hemaiswarya, Shanmugam; Raja, R.; Ravikumar, R.; Carvalho, Isabel Saraiva deMicroalgae are a diverse group of organisms that form the basic component of many eco- systems. The systemic classification of algae is primarily based on their pigment composition and is divided into nine classes. The largest groups are Chlorophyceae (green algae), Phaeophyceae (brown algae), Pyrrophyceae (dinoflagellates), Chrysophyceae (golden brown algae), Bacillariophyceae (diatoms) and Rhodo phyceae (re...
Antioxidant activities, distribution of phenolics and free amino acids of Erica...
Nunes, Ricardo; Carvalho, Isabel Saraiva deLeaves and flowers from Erica plant possess nutritional and medicinal properties. We determined the antioxidant activity, phenolic, flavonoid and amino acid profiles of the leaves and flowers of this plant. Total amino acid content varied from 28 to 49 and essential amino acids from 8 to 20mg/g for flowers and leaves, respectively, with different distributions within the plant. From 16 phenolic compounds identi...