The role of dextran production in the metabolic context of Leuconostoc and Weissella Tunisian strains

High molecular weight dextrans improve the rheological properties of fermented products and have immunomodulatory antiviral activity. We report on 5.84 × 107–2.61 108 Da produced by Leuconostoc lactis AV1n, Weissella cibaria AV2ou confusa V30 FS54 strains. Dextransucrases catalyze dextran synthesis sucrose hydrolysis concomitant with fructose generation. The four bacteria dextransucrases about 160 kDa detected zymograms. Each bacterium showed different interplay production metabolic fluxes. All lactate, apart, synthesized mannitol from fructose. hydrolyzed blue concentration this decreased during stationary phase. AV1n binding to Caco-2 cells polystyrene plates was higher under conditions for synthesis. Thus, is first instance a dextranase, associated dextransucrase ability, positive influence adhesion aggregation bacterium.