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Arthrospira (Spirulina) platensis was cultivated in laboratory under controlled conditions (30ºC, photoperiod of 12 hours light/dark provided by fluorescent lamps at a light intensity of 140 µmol photons.m-2.s-1 and constant bubbling air) in three different culture media: (1) Paoletti medium (control), (2) Paoletti supplemented with 1 g.L-1 NaCl (salinated water) and (3) Paoletti medium prepared with desalinator wastewater. The effects of these treatments on growth, protein content and amino acid profile were measured. Maximum cell concentrations observed in Paoletti medium, Paoletti supplemented with salinated water or with desalinator wastewater were 2.587, 3.545 and 4.954 g.L-1, respectively. Biomass in medium 3 presented the highest protein content (56.17%), while biomass in medium 2 presented 48.59% protein. All essential amino acids, except lysine and tryptophan, were found in concentrations higher than those requiried by FAO. Arthrospira (Spirulina) platensis foi cultivada em laboratório sob condições controladas (30ºC, intensidade luminosa de 140 µmol fótons.m-2.s-1, 12 horas claro/escuro e insuflação constante de ar atmosférico), em três meios de cultivo: (1) meio de Paoletti (controle), (2) meio de Paoletti suplementado com 1,0 g.L-1 de NaCl (água salinizada) e (3) meio de Paoletti preparado com rejeito de dessalinizador. Foi verificado o efeito destes tratamentos no crescimento, teor de proteínas e aminoácidos. As concentrações celulares máximas obtidas foram de 2,587; 3,545 e 4,954 g.L-1 no meio controle, meio de Paoletti suplementado com água salinizada ou com rejeito de dessalinizador, respectivamente. Com relação às concentrações protéicas, estas foram maiores na biomassa cultivada no meio 3, com 56,17%, enquanto que a biomassa cultivada no meio 2 apresentou 48,59%. A maioria dos aminoácidos essenciais encontrou-se acima dos limites requeridos pela FAO, com exceção apenas de lisina e triptofano

Cultivation of Arthrospira (spirulina) platensis in desalinator wastewater and salinated synthetic medium: protein content and amino-acid profile