Abstract
Several marine thermophilic strains were analyzed for exopolysaccharide production. The screening process revealed that a significant number of thermophilic microorganisms were able to produce biopolymers, and some of them also revealed interesting chemical compositions. We have identified four new polysaccharides from thermophilic marine bacteria, with complex primary structures and with different repetitive units: a galacto-mannane type from strain number 4004 and mannane type for the other strains.The thermophilic Bacillus thermantarcticus produces two exocellular polysaccharides (EPS 1, EPS 2) that give the colonies a typical mucous character. The exopolysaccharide fraction was produced with all substrates assayed, although a higher yield 400 mg liter-1 was obtained with mannose as carbon and energy source. NMR spectra confirmed that EPS 1 was a heteropolysaccharide of which the repeating unit was constituted by four different α-D-mannoses and three different β-D-glucoses. It seems to be close to some xantan polymers. EPS 2 was a mannan. Four different α-D-mannoses were found as the repeating unit.Production and chemical studies of biopolymers produced by halophilic archaea, Haloarcula species were also reported.
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Nicolaus, B., Moriello, V.S., Lama, L. et al. Polysaccharides from Extremophilic Microorganisms. Orig Life Evol Biosph 34, 159–169 (2004). https://doi.org/10.1023/B:ORIG.0000009837.37412.d3
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DOI: https://doi.org/10.1023/B:ORIG.0000009837.37412.d3