Growth evaluation and bioproduct characteristics of certain freshwater algae isolated from River Nile, Egypt.
Year: 2010
Type: article
Abstract: Blue-green algae (cyanobacteria) form an important component of integrated nutrient management in agriculture and are exploited in commercial biotechnological ventures. Four algal species Anabaen sphaerica, Chroococcus turgidus, Oscillatoria limnetica and Spirulina platensis were isolated and recultivated to evaluate its potential production of primary products. The maximum biomass measured as chlorophyll a content differed from one algal strain to another. Also, the highest production of carotenoid and phycocyanin takes place in Spirulina platensis (1.4 and 4.5 mg/ml). On the other hand, Oscillatoria limnetica produce the lowest carotenoid and phycocyanin content (0.8 and 0.18mg/ml). The candidate algal species used through the investigation differed markedly in its production in the quantity, quality and type of bound as well as free amino acids. About 16 amino acids are produced by all candidate species; however it revealed a pronounced difference in the quantity and quality of each amino acid produced. Anabaena and Spirulina have the highest concentration and numbers of amino acids in the free form. Referring to different sugar unit of polysaccharide content results showed that it include sugars such as glucose, galactose, mannose, fructose, xylose, glacturonic acid, sucrose and fucose. The most dominant saturated fatty acid extracted from all investigated strains are caprilic, capric, lauric, myristic, palmitic and margaric. Regarding to the unsaturated fatty acids, results has been shown that all algal species under investigation are characterized by its production to unsaturated fatty acids especially oleic, linoleic. Moreover, Anabaena sphaerica was characterized by its production to another type of unsaturated fatty acid (in addition to the other both types) is the linolenic acid. The most pronounced unsaponifiable matters produced by the selected algal species are cholesterol, campasterol, stigmasterol and βsitosterol. The results shown that cholesterol, campasterol and stigmasterol are produced by all candidate species. While, βsitosterol are the only unsaponifiable fatty acid produced by Spirulina and Chroococcus. Key wards: Cyanobacteria (Blue-green Algae), Bioactive compound, Algae, Fatty acid, Carbohydrate, Protein, Amino acids.
Authors: Susana Abdo, Mona H. Hetta, R. A. S. El-Din, Gamila H. Ali
Language: English
Field: Energy
Domain: Physical Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W2418586591