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Titolo:
Modeling of eicosapentaenoic acid (EPA) production from Phaeodactylum tricornutum cultures in tubular photobioreactors. Effects of dilution rate, tube diameter, and solar irradiance
Autore:
Fernandez, FGA; Perez, JAS; Sevilla, JMF; Camacho, FG; Grima, EM;
Indirizzi:
Univ Almeria, Dept Ingn Quim, E-04071 Almeria, Spain Univ Almeria Almeria Spain E-04071 ept Ingn Quim, E-04071 Almeria, Spain
Titolo Testata:
BIOTECHNOLOGY AND BIOENGINEERING
fascicolo: 2, volume: 68, anno: 2000,
pagine: 173 - 183
SICI:
0006-3592(20000420)68:2<173:MOEA(P>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
OUTDOOR CHEMOSTAT CULTURE; ISOCHRYSIS-GALBANA ALII-4; FATTY-ACID; BIOMASS PRODUCTIVITY; MICROALGAL CULTURES; SPIRULINA-PLATENSIS; GROWTH; LIGHT; PHOTOINHIBITION; TEMPERATURE;
Keywords:
eicosapentaenoic acid; Phaeodactylum tricornutum; tubular photobioreactor; irradiance; photoinhibition; light regime;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Grima, EM Univ Almeria, Dept Ingn Quim, E-04071 Almeria, Spain Univ Almeria Almeria Spain E-04071 uim, E-04071 Almeria, Spain
Citazione:
F.G.A. Fernandez et al., "Modeling of eicosapentaenoic acid (EPA) production from Phaeodactylum tricornutum cultures in tubular photobioreactors. Effects of dilution rate, tube diameter, and solar irradiance", BIOTECH BIO, 68(2), 2000, pp. 173-183

Abstract

A model for the prediction of eicosapentaenoic acid (EPA) productivity from Phaeodactylum tricornutum cultures that takes into account the existence of photolimitation and photoinhibition of growth under outdoor conditions is presented. The effects of the external irradiance on the culture surface,the average irradiance inside the culture, and the light regime at which the cells are exposed on pigments and EPA content are studied. The chlorophyll content decreases exponentially with the average irradiance, whereas thecarotenoids content increases linearly with the external irradiance due toa higher extension of photoinhibition. A decrease in the fatty acid content of the biomass with irradiance on reactor surface is observed when photoinhibition becomes relevant. The average irradiance within the culture mainly influenced the fatty acid profile of the biomass. As the average irradiance becomes higher, percentages of saturated and monounsaturated fatty acidsdecrease, increasing the portion of EPA. By taking into account the different relationships among pigment and EPA content with the irradiance, the variation in EPA productivity over the year can be simulated as a function ofaverage and external irradiance. For the two photobioreactors employed themaximum EPA productivity is attained in spring and fall (30 mg L-1 day(-1)for tube diameter 0.06 m and 50 mg L-1 day(-1) for tube diameter 0.03 m). In winter, the biomass productivity is limited by low light availability although the EPA content is maximum. In summer, the biomass productivity is higher although the EPA content diminished by photoinhibition; the higher the dilution rate, the lower the minimum. Thus, the conditions that increase the biomass productivity and the polyunsaturated fatty acids content are inopposition, the optimum being reached by operating under photolimitation with high growth rates in order to produce a high proportion of polyunsaturated fatty acids. (C) 2000 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 11:52:11