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Research article

J. Microbiol. Biotechnol. 2011; 21(7): 697-702

Published online July 28, 2011 https://doi.org/10.4014/jmb.1101.12040

Copyright © The Korean Society for Microbiology and Biotechnology.

Isolation and Characterization of a Mesophilic Arthrospira maxima Strain Capable of Producing Docosahexaenoic Acid

Hongjun Hu 1, Yeguang Li 1, Chuntao Yin 1 and Yexin Ouyang 1*

Key Laboratory of Plant Germplasm Enhancement and Speciality Agriculture, Wuhan Botanical Garden, Chinese Academic of Sciences Wuhan 430074, P. R. China

Received: January 3, 2011; Accepted: April 5, 2011

Abstract

A strain of the cyanobacterium Arthrospira was isolated
from Lake Chahannaoer in northern China and was
characterized according to microscopic morphology,
photosynthetic oxygen-evolving activity, growth rate, and
nutritional profile. Compared with thermophilic Arthrospira
species occurring naturally in tropical and subtropical
lakes, this isolate is mesophilic and grows optimally at
~20oC. The total protein, fatty acid, phycocyanin, carotenoid,
and chlorophyll a contents were 67.6, 6.1, 4.32, 0.29, and
0.76 grams per 100 grams of dry weight, respectively. The
strain is rich in polyunsaturated fatty acids (PUFAs). An
essential omega-3 fatty acid, docosahexaenoic acid (DHA),
was detected, and γ-linolenic acid (GLA) and DHA
accounted for 28.3% of the total fatty acid content. These
features of this newly isolated strain make it potentially
useful in commercial mass culture in local areas or as a
biofuel feedstock. It is also an alternative resource for
studying the metabolic PUFA pathways and mechanisms
of cold stress tolerance in cyanobacteria.

Keywords: polyunsaturated fatty acids (PUFAs), docosahexaenoic acid (DHA), γ-linolenic (GLA), mesophilic, cyanobacterium, Arthrospira maxima