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[Effect of nutritional conditions on the viscosity and emulsifying capacity of V2-7 biopolymer from Volcaniella eurihalina].

Volcaniella eurihalina is a moderately halophilic bacterium able to produce an exopolysaccharide (EPS) under different culture conditions. Rheological behavior of 1% EPS solutions varied depending on the conditions under which EPS were produced. The maximum viscosity was reached when maltose was used as carbon source. Limitations of phosphorus and sulfur also increased its viscosity power. On the other hand, the addition of residual oil products to the culture medium enhanced the production of this biosurfactant polymer.