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Characterization of xanthans from selected Xanthomonas strains cultivated under constant dissolved oxygen

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Abstract

Seventeen wild-type Xanthomonas isolates were screened in terms of broth viscosity in shake-flasks. As culture conditions affect polymer characteristics, a fair comparison among isolates required their cultivation in a fermenter under controlled dissolved oxygen tension. Three isolates and a reference strain were studied. The mean molecular weights and molecular weight distributions of their xanthans were determined. Products showed different pyruvate (0.2–7%), acetate (5–10%) and proteinaceous nitrogen (1–3%) contents. The selected isolates exhibit properties which could improve xanthan gum production and some could be used to produce polymers with specific characteristics.

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Sa´nchez, A., Rami´rez, M., Torres, L. et al. Characterization of xanthans from selected Xanthomonas strains cultivated under constant dissolved oxygen. World Journal of Microbiology and Biotechnology 13, 443–451 (1997). https://doi.org/10.1023/A:1018532418417

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