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Chlorella vulgaris as a Lipid Source: Cultivation on Air and Seawater-Simulating Medium in a Helicoidal Photobioreactor.

Identifieur interne : 000222 ( Main/Exploration ); précédent : 000221; suivant : 000223

Chlorella vulgaris as a Lipid Source: Cultivation on Air and Seawater-Simulating Medium in a Helicoidal Photobioreactor.

Auteurs : Davide Frumento [Italie] ; Bahar Aliakbarian [Italie] ; Alessandro Alberto Casazza [Italie] ; Saleh Al Arni [Arabie saoudite] ; Milena Fernandes Da Silva [Brésil] ; Attilio Converti [Italie]

Source :

RBID : pubmed:26697953

Abstract

The freshwater microalga Chlorella vulgaris was cultured batchwise on the seawater-simulating Schlösser medium either in a 1.1-L-working volume helicoidal photobioreactor (HeP) or Erlenmeyer flask (EF) as control and continuously supplying air as CO2 source. In these systems, maximum biomass concentration reached 1.65 ± 0.17 g L(-1) and 1.25 ± 0.06 g L(-1) , and maximum cell productivity 197.6 ± 20.4 mg L(-1) d(-1) and 160.8 ± 12.2 mg L(-1) d(-1) , respectively. Compared to the Bold's Basal medium commonly employed to cultivate this microorganism on a bench-scale, the Schlösser medium ensured significant increases in all the growth parameters, namely maximum cell concentration (268% in EF and 126% in HeP), maximum biomass productivity (554% in EF and 72% in HeP), average specific growth rate (67% in EF and 42% in HeP) and maximum specific growth rate (233% in EF and 22% in HeP). The lipid fraction of biomass collected at the end of runs was analyzed in terms of both lipid content and fatty acid profile. It was found that the seawater-simulating medium, despite of a 56-63% reduction of the overall biomass lipid content compared to the Bold's Basal one, led in HeP to significant increases in both the glycerides-to-total lipid ratio and polyunsaturated fatty acid content compared to the other conditions taken as an average. These results as a whole suggest that the helicoidal photobioreactor configuration could be a successful alternative to the present means to cultivate C. vulgaris as a lipid source. This article is protected by copyright. All rights reserved.


DOI: 10.1002/btpr.2218


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<div type="abstract" xml:lang="en">The freshwater microalga Chlorella vulgaris was cultured batchwise on the seawater-simulating Schlösser medium either in a 1.1-L-working volume helicoidal photobioreactor (HeP) or Erlenmeyer flask (EF) as control and continuously supplying air as CO2 source. In these systems, maximum biomass concentration reached 1.65 ± 0.17 g L(-1) and 1.25 ± 0.06 g L(-1) , and maximum cell productivity 197.6 ± 20.4 mg L(-1) d(-1) and 160.8 ± 12.2 mg L(-1) d(-1) , respectively. Compared to the Bold's Basal medium commonly employed to cultivate this microorganism on a bench-scale, the Schlösser medium ensured significant increases in all the growth parameters, namely maximum cell concentration (268% in EF and 126% in HeP), maximum biomass productivity (554% in EF and 72% in HeP), average specific growth rate (67% in EF and 42% in HeP) and maximum specific growth rate (233% in EF and 22% in HeP). The lipid fraction of biomass collected at the end of runs was analyzed in terms of both lipid content and fatty acid profile. It was found that the seawater-simulating medium, despite of a 56-63% reduction of the overall biomass lipid content compared to the Bold's Basal one, led in HeP to significant increases in both the glycerides-to-total lipid ratio and polyunsaturated fatty acid content compared to the other conditions taken as an average. These results as a whole suggest that the helicoidal photobioreactor configuration could be a successful alternative to the present means to cultivate C. vulgaris as a lipid source. This article is protected by copyright. All rights reserved.</div>
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