Enhancement of docosahexaenoic acid production by Schizochytrium sp. using a two-stage oxygen supply control strategy based on oxygen transfer coefficient.
Lett Appl Microbiol
; 52(1): 22-7, 2011 Jan.
Article
em En
| MEDLINE
| ID: mdl-21070268
ABSTRACT
AIMS:
To improve the yield and productivity of docosahexaenoic acid (DHA) by Schizochytrium sp. in terms of the analysis of microbial physiology. METHODS ANDRESULTS:
A two-stage oxygen supply control strategy, aimed at achieving high concentration and high productivity of DHA, was proposed. At the first 40 h, K(L) a was controlled at 150·1 h(-1) to obtain high µ for cell growth, subsequently K(L) a was controlled at 88·5 h(-1) to maintain high q(p) for high DHA accumulation. Finally, the maximum lipid, DHA content and DHA productivity reached 46·6, 17·7 g l(-1) and 111 mg l(-1) h(-1), which were 43·83%, 63·88% and 32·14% over the best results controlled by constant K(L) a.CONCLUSIONS:
This paper described a two-stage oxygen supply control strategy based on the kinetic analysis for efficient DHA fermentation by Schizochytrium sp. SIGNIFICANCE AND IMPACT OF THE STUDY This study showed the advantage of two-stage control strategy in terms of microbial physiology. As K(L) a is a scaling-up parameter, the idea developed in this paper could be scaled-up to industrial process and applied to other industrial biotechnological processes to achieve both high product concentration and high productivity.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Oxigênio
/
Microbiologia Industrial
/
Ácidos Docosa-Hexaenoicos
/
Estramenópilas
Idioma:
En
Revista:
Lett Appl Microbiol
Assunto da revista:
MICROBIOLOGIA
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
China