Influence of ammonium chloride feeding time and light intensity on the cultivation of Spirulina (Arthrospira) platensis |
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Authors: | Bezerra Raquel Pedrosa Matsudo Marcelo Chuei Converti Attilio Sato Sunao de Carvalho João Carlos Monteiro |
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Institution: | 1. Department of Biochemical and Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, University of S?o Paulo, Av. Prof. Lineu Prestes, 580, B‐16, S?o Paulo 05508‐900, Brazil;2. telephone: +55‐11‐30913886;3. fax: +55‐11‐38156386;4. Department of Chemical and Process Engineering “G.B. Bonino”, University of Genoa, Genoa, Italy |
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Abstract: | This study dealt with the influence of both the feeding time and light intensity on the fed-batch culture of the cyanobacterium Spirulina (Arthrospira) platensis using ammonium chloride as a nitrogen source. For this purpose, a 2(2) plus star central composite experimental design combined with response surface methodology was employed, and the maximum cell concentration (X(m)), the cell productivity (P(X)), and the yield of biomass on nitrogen (Y(X/N)) were selected as the response variables. The optimum values of X(m) (1,833 mg L(-1)) and Y(X/N) (5.9 g g(-1)) estimated by the model at light intensity of 13 klux and feeding time of 17.2 days were very close to those obtained experimentally under these conditions (X(m) = 1,771 +/- 41 mg L(-1); Y(X/N) = 5.7 +/- 0.17 g g(-1)). The cell productivity was a decreasing function of the ammonium chloride feeding time and a quadratic function of the light intensity. The protein and lipid contents of dry biomass collected at the end of cultivations were shown to decrease with increasing light intensity. |
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Keywords: | ammonium chloride light intensity Spirulina (Arthrospira) platensis fed‐batch cultivation response surface methodology |
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