Abstract:
:In oyster ponds, the marine diatom Haslea ostrearia synthesises and excretes a hydrosoluble pigment of commercial interest called marennin. During the benthic stage, when algal cells are naturally immobilised in their own polysaccharides, marennin production is higher. To optimise this production, axenic cultures of H. ostrearia were immobilised in a polysaccharidic matrix (alginate or agar) and introduced into a new photobioreactor device for continuous marennin production. Solute diffusion was improved using an alginate beads monolayer, leading to higher levels of cell growth (a 2-fold higher cell concentration) and marennin productivity (7.57-8.80 mg day(-1) l(-1)). An increase in the light intensity (from 3.0 to 8.5x10(16) quanta cm(-2) s(-1)) led to an earlier and 1.3-fold higher production of marennin. However, the higher light intensity led to a higher rate of cell death [0.29 instead of 0.40 ng chlorophyll a (10(6) cells)(-1)]. Due to the secondary nature of marennin metabolism, it would be necessary to alternate between culture conditions favouring cell growth (moderate light intensity and no limiting nitrate supply) and those promoting marennin production (high light intensity and limiting nitrate supply).
journal_name
Appl Microbiol Biotechnoljournal_title
Applied microbiology and biotechnologyauthors
Lebeau T,Gaudin P,Moan R,Robert JMdoi
10.1007/s00253-002-0993-9subject
Has Abstractpub_date
2002-07-01 00:00:00pages
153-9issue
2-3eissn
0175-7598issn
1432-0614journal_volume
59pub_type
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