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Succinoglycan production by solid-state fermentation with Agrobacterium tumefaciens.
Succinoglycan was produced by cultivating Agrobacterium tumefaciens on various solid substrates, including agar medium, spent malt grains, ivory nut shavings, and grated carrots, impregnated with a nutrient+ solution. Fermentations were performed on a laboratory scale, both under static conditions and with agitation, using bottles and a prototype horizontal bioreactor. Several fermentation parameters were examined and optimized, including carbon and nitrogen composition, water content and layer thickness of the substrate. The yields and rheological properties of the polymers obtained under different fermentation conditions were compared. The highest succinoglycan yield was achieved in static cultivation, reaching 42 g/l of impregnating solution, corresponding to 30 g/kg of wet substrate. The polymer production in the horizontal bioreactor was faster, but the final yield was lower (29 g/l of impregnating solution).
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