EQA - Escola de Química e Alimentos
URI permanente desta comunidadehttps://rihomolog.furg.br/handle/1/1610
Navegar
4 resultados
Resultados da Pesquisa
- ItemThe role of biochemical engineering in the production of biofuels from microalgae(2011) Costa, Jorge Alberto Vieira; Morais, Michele Greque deEnvironmental changes that have occurred due to the use of fossil fuels have driven the search for alternative sources that have a lower environmental impact. First-generation biofuels were derived from crops such as sugar cane, corn and soybean, which contribute to water scarcity and deforestation. Second-generation biofuels originated from lignocellulose agriculture and forest residues, however these needed large areas of land that could be used for food production. Based on technology projections, the third generation of biofuels will be derived from microalgae. Microalgae are considered to be an alternative energy source without the drawbacks of the first- and second-generation biofuels. Depending upon the growing conditions, microalgae can produce biocompounds that are easily converted into biofuels. The biofuels from microalgae are an alternative that can keep the development of human activity in harmony with the environment. This study aimed to present the main biofuels that can be derived from microalgae.
- ItemVertical tubular photobioreactor for semicontinuous culture of Cyanobium sp(2011) Henrard, Adriano Seizi Arruda; Morais, Michele Greque de; Costa, Jorge Alberto VieiraWe evaluated the kinetic culture characteristics of the microalgae Cyanobium sp. grown in vertical tubular photobioreactor in semicontinuous mode. Cultivation was carried out in vertical tubular photobioreactor for 2 L, in 57 d, at 30 °C, 3200 Lux, and 12 h light/dark photoperiod. The maximum specific growth rate was found as 0.127 d−1, when the culture had blend concentration of 1.0 g L−1, renewal rate of 50%, and sodium bicarbonate concentration of 1.0 g L−1. The maximum values of productivity (0.071 g L−1 d−1) and number of cycles (10) were observed in blend concentration of 1.0 g L−1, renewal rate of 30%, and bicarbonate concentration of 1.0 g L−1. The results showed the potential of semicontinuous cultivation of Cyanobium sp. in closed tubular bioreactor, combining factors such as blend concentration, renewal rate, and sodium bicarbonate concentration
- ItemBiscoitos de chocolate enriquecidos com spirulina platensis: características físicoquímicas,sensoriais e digestibilidade(2006) Morais, Michele Greque de; Miranda, Martha Zavariz de; Costa, Jorge Alberto VieiraAs microalgas, como Spirulina, podem ser fonte de proteínas para alimentação humana, com a possibilidade de obter outros produtos como biopigmentos,vitaminas e lipídios. A biomassa obtida pode ser introduzida diretamente na dieta podendo auxiliar em casos de desnutrição. O objetivo deste trabalho foi avaliar as características físico-química, sensorial e digestibilidade de biscoitos de chocolate enriquecidos com a microalga Spirulina platensis. Foram elaborados quatro biscoitos de chocolate: controle (sem Spirulina) e biscoitos contendo 1,0;3,0 e 5,0% de Spirulina platensis. O biscoito com adição de 5,0% de Spirulina platensis apresentou o conteúdo protéico 7,7% maior que o controle. Os biscoitos com adição de 1,0% de S. platensis apresentaram maior digestibilidade (86,9%)que os demais. Volume específico, espessura e fator de expansão não foram alterados pela adição de Spirulina. Não houve diferença significativa entre o biscoito controle e os biscoitos com adição de 5,0% nos atributos cor, crocância, mastigabilidade e maciez. Na avaliação questionamento de intenção de compra, comparando os biscoitos com adição de S. platensis, a amostra com maior aceitação pelos julgadores foi com 1,0% de S. platensis.
- ItemBioprocessos para remoção de dióxido de carbono e óxido de nitrogênio por microalgas(2008) Morais, Michele Greque de; Costa, Jorge Alberto VieiraThe aim of this work was to study the removal of CO2 and NO by microalgae and to evaluate the kinetic characteristics of the cultures. Spirulina sp. showed μmax and Xmax (0.11 d-1, 1.11 g L-1 d-1) when treated with CO2 and NaNO3. The maximum CO2 removal was 22.97% for S. obliquus treated with KNO3 and atmospheric CO2. The S. obliquus showed maximum NO removal (21.30%) when treated with NO and CO2. Coupling the cultivation of these microalgae with the removal of CO2 and NO has the potential not only to reduce the costs of culture media but also to offset carbon and nitrogen emissions.