B. subtilis; Iturin; Surfactin; oxygen transfer; oxygen vecto
Abstract :
[en] Bacillus subtilis produces three types of lipopeptides: Iturins, Fengycins, and Surfactins. These amphiphilic molecules influence the volumetric oxygen transfer (K(L)a) like chemical surfactant. K(L)a values were from two- to fivefold lower when both Iturin A and Surfactin S1 were coproduced, and from 0.57- to 0.8-fold lower when only Iturin A was produced. The addition of an oxygen vector (n-Dodecane) during fermentation increased K(L)a values (7.5-fold) and biomass production (twofold), and decreased Iturin A and Surfactin S1 production. However, at high stirring conditions and in the presence of n-Dodecane, Iturin A production was improved.
Disciplines :
Agriculture & agronomy
Author, co-author :
Hbid, Choukri
Jacques, Philippe ; Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Bio-industries