The gross chemical composition and fatty acid composition of 18 species of tropical Australian microalgae for possible use in mariculture

Chemical compositon of three microalgae species for possible use in mariculture

“…High chlorophyll a values were probably due to the high cell density, which diminished irradiation inside the carboy, leading to the increased production of chlorophyll a . These values were considered low for the analyzed culture phase (final exponential phase where the species tended to accumulate carbohydrates), due to nitrogen limitation during the log phase for the protein synthesis, reducing the amount of soluble protein, as also observed by Brown (1991), Brown et al (1997) and Renaud et al (1999). This was also observed in this work in relation to soluble protein ( Figure 2C), where the highest value was found in C. closterium (0.62±0.04 mg.L -1 ), followed by C. gracilis (0.58±0.02 mg.L -1 ) and T. gracilis (0.38±0.04 mg.L -1 ).…”

“…As it happens in any superior vegetable, microalgae biomass and chemical composition can vary according to environment conditions and the age of the culture (Lourenço et al, 1998;Renaud et al, 1999;Araújo, et al, 2005). In C. gracilis cultures, pH varied from 7.7 to 9.5 and from 7.5 to 10 in T. gracilis cultures.…”

“…This, in turn, depends on the food efficiency of different trophic levels (Sipaúba-Tavares and Rocha, 2001). The importance of the success of unialgae mass cultures consists in the great variety of fields, such as genetic, cytology, taxonomy and plant physiology, that can utilize this resource (Sukenik and Whanon, 1991;Fidalgo et al, 1998;Renaud et al, 1999). Microalgae chemical composition is frequently determined with the objective to provide the necessary nutritional balance for the captive animals (Whyte, 1987;Brown et al 1997Southgate et al, 1998;Caers et al, 1999;McCausland et al, 1999), and also to determine the biochemical variation of the microalgae composition with respect to the nutritional medium in which the microalgae are being cultivated (Antia et al, 1977;Fabregas et al, 1985a andb, 1986;Melo et al, 1993;Lourenço et al, 1997).…”

Screening and evaluation of non-heterocystous filamentous cyanobacteria for lipid and commercially viable fatty acids

“…Microalgae accumulate large amounts of lipids as reserve material, with especially in conditions of stress and slow growth [9]. The fatty acid composition of marine microalgae has been studied more extensively [10]; [11]; [12]; [13] than the freshwater forms [14]; [15]; [16]. Thus there is need to screen fresh water cyanobacteria for lipids of commercial value.…”

Produção de biomassa e teores de carbono, hidrogênio, nitrogênio e proteína em microalgas

“…Na espécie Chaetoceros sp., RENAUD et al (1999) encontraram 36,7% de proteína, com média de 26,3% para a ordem Bacillariophyceae, 28,15% para Tetraselmis sp., com média de 29,5% para Prasinophyceae e 29,5% para Isochrysis sp., com média de 28,3% para a ordem Prymnesiophyceae. Valor aproximado foi obtido para Isochrysis sp., com média de 24,49% para a ordem Prymnesiophyceae (Isochrysis sp.…”