A new exopolysaccharide produced by marine Cyanothece sp. 113

Cyanothece sp. 113, a unicellular, aerobic, diazotrophic and photosynthetic marine cyanobacterium, produced 22.34 g/l of exopolysaccharide in 11 days at 29 °C, aeration rate of 7.0 l/min and continuous illumination with 4300  lux. After purification, the spectra of UV, IR, 1H NMR, 13C NMR and GC–MS analysis showed that the purified exopolysaccharide was α-D-1,6-homoglucan. This is first report describing linear α-D-1,6-homoglucan exopolysaccharide produced by marine cyanobacteria.