Abstract
This study aimed to investigate the effect of nitrogen sources on the production and rheological properties of welan gum produced by Sphingomonas sp. ATCC 31555. Six different nitrogen sources were used for ATCC 31555 fermentation, and 2 of these were further analyzed due to their more positive influence on welan gum production and bacterial biomass. Bacterial biomass, welan gum yield, welan viscosity, molecular weight, monosaccharide composition, acyl content, and welan structure were analyzed. Welan gum production and the biomass concentration of ATCC 31555 were higher in media containing NaNO<sub>3</sub> and beef extract. Welan viscosity decreased at higher temperatures of 30-90°C, and it increased with a higher welan concentration. In the media containing NaNO<sub>3</sub> (3 g·L<sup>-1</sup>), welan viscosity was higher at 30-70°C and a welan solution concentration of 6-10 g·L<sup>-1</sup>. With a reduced NaNO<sub>3</sub> concentration, the molecular weight of welan gum and the molar ratio of mannose decreased, but the molar ratio of glucuronic acid increased. With different nitrogen sources, the acetyl content of welan gum differed but its structure was similar. NaNO<sub>3</sub> and beef extract facilitated welan production. A reduced NaNO<sub>3</sub> concentration promoted welan viscosity.
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