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Bioresour Technol. 2007 Feb;98(3):700-5. Epub 2006 Apr 3.

Effects of electromagnetic field on the batch cultivation and nutritional composition of Spirulina platensis in an air-lift photobioreactor.

Author information

1
School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China. zyli@sjtu.edu.cn

Abstract

Spirulina platensis was batch cultivated in a novel 3.5l magnetic air-lift photobioreactor with external-loop on which 0-0.55 T electromagnetic field (EMF) was imposed to investigate the EMF effects on the algal growth and nutrition composition. At the same time, the correlative mechanism was discussed mainly based on C, N, P uptake. It was found that, EMF has double-side effects on S. platensis cultivation depend on EMF intensity. 0.25 T EMF stress was found to be suitable for the algal cultivation enhancement increasing the maximum cell dry weight by 22% in a time period two days less than that of the control at 35 degrees C and 252 micromol photonsm(-2)S(-1). In addition, the nutritional composition of S. platensis was improved in both essential amino acids such as histidine and trace elements Ni, Sr, Cu, Mg, Fe, Mn, Ca, Co and V. It was suggested it was possible to optimize the cultivation process of S. platensis by imposing suitable weak EMF which may enhance the nutrition assimilation e.g. C, N, P and minerals by S. platensis.

PMID:
16581244
DOI:
10.1016/j.biortech.2006.01.024
[Indexed for MEDLINE]

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