Journal
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
Volume 27, Issue 9, Pages 2139-2146Publisher
SPRINGER
DOI: 10.1007/s11274-011-0678-6
Keywords
Cyanobacterium; Exopolysaccharides; Kinetics; Physico-chemical characterization; Oscillatoria formosa; Rheology
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Funding
- Council of Scientific & Industrial Research, New Delhi [38(1189)/08/EMR-II]
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Exopolysaccharides of the cyanobacterium Oscillatoria formosa have been physico-chemically characterized and kinetics of their production studied. The organism produced 334.8 mu g EPS per ml culture in 24 days with the maximum rate of production obtained during initial days of growth. HPLC analysis of the EPS hydrolysate revealed that besides three unidentified sugars, EPS contained ribose, mannose, and galacturonic acid. FT-IR spectrum of EPS revealed the presence of methyl, carboxyl and C-N groups. Elemental analysis indicated the presence of 4.7% nitrogen in EPS. The organism produced 75.6% more EPS when incubated at 35A degrees C compared to cultures at 28A degrees C. Under varied nutritional conditions, though the growth of the organism was less yet it produced enhanced amounts of EPS. Aqueous dispersions of EPS showed non-Newtonian, pseudoplastic behaviour. The viscosity of the aqueous solution of EPS was quite stable over a wide range of pH and temperature but it was observed to be affected by CaCl2..
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