Affiliation:
1. The Institute of Life Sciences, Division of Microbial and Molecular Ecology, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel
Abstract
Several benthic cyanobacteria were found to produce significant amounts of extracellular flocculants. The macromolecular flocculants produced by
Phormidium
sp. strain J-1 and
Anabaenopsis circularis
PCC 6720 were characterized. The
Phormidium
flocculant is a sulfated heteropolysaccharide to which fatty acids and protein are bound. The polysaccharide backbone is composed of uronic acids, rhamnose, mannose, and galactose. The
A. circularis
flocculant is also an acidic polysaccharide containing keto acid residues and neutral sugars, but to which no fatty acids, proteins, or sulfates are linked. Both flocculants could be recovered from growth medium by precipitation with cetyltrimethylammonium bromide and were found to bind the cationic dye Alcian-blue in a linear proportion to their concentration in solution. The latter property was used to quantify flocculant concentrations in culture supernatants and natural water samples and to compute their anion densities.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Cited by
90 articles.
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