  Interaction Of Surfactin With Membranes: A Computational ApproachDeleu, Magali  ; ; Razafindralambo, Hary et alin Langmuir (2003), 19(8), Detailed reference viewed: 47 (14 ULg)Optimization of biosurfactant lipopeptide production from Bacillus subtilis S499 by Plackett-Burman design; ; Destain, Jacqueline et alin Applied Biochemistry and Biotechnology (1999), 77-9 Bacillus subtilis S499 is well-known for its ability to produce two families of surfactant lipopeptides: Iturin A and Surfactin S1. Fermentation optimization for this strain was performed to amplify the ... [more ▼] Bacillus subtilis S499 is well-known for its ability to produce two families of surfactant lipopeptides: Iturin A and Surfactin S1. Fermentation optimization for this strain was performed to amplify the surfactant production. Ten active variables were analyzed by two successive Plackett-Burman designs, consisting respectively of 12 and 16 experiments to give an optimized medium. The amount of biosurfactant lipopeptides in the supernatant of a culture carried out in this optimized medium was about five times higher than that obtained in nonoptimized rich medium. The analysis of the surfactant molecules produced in such optimized conditions has revealed the presence of a third family of lipopeptides: the fengycins. The time-dependent production of these three families of molecules in bioreactors showed that surfactin S1 is produced during the exponential phase and iturin A and fengycins during the stationary phase. [less ▲] Detailed reference viewed: 113 (12 ULg)Foaming properties of a natural cyclic lipoheptapeptide belonging to a special class of amphiphilic moleculesRazafindralambo, Hary ; Paquot, Michel ; et alin Food Hydrocolloids (1997), 11(1), 59-62 The foaming properties of surfactin, a natural cyclic lipoheptapeptide from Bacillus subtilis, were investigated in comparison and in association with those of bovine serum albumin (BSA). An apparatus ... [more ▼] The foaming properties of surfactin, a natural cyclic lipoheptapeptide from Bacillus subtilis, were investigated in comparison and in association with those of bovine serum albumin (BSA). An apparatus combining bubbling, optical and conductimetric methods was used to study continuously foam formation and stability in terms of the quantity and density of foam. The increase in surfactin concentration from 0.05 to 0.2 mg/ml had little effect on its foaming capacity, measured by the bubbling time to produce the required foam volume, but improved the foam maximum density significantly. Surfactin produced foam with higher maximum density and stability, and forms more regular and smaller bubbles than BSA. In addition, a synergistic effect was observed on the stability of liquid in foam prepared with a mixture of 50:50 surfactin/BSA. The liquid half-life of BSA foam was enhanced up to 40% when surfactin was added to the solution. [less ▲] Detailed reference viewed: 34 (25 ULg)Oxygen transfert during Bacillus subtilis fermentation. Influence of lipopeptide production, and an oxygen vector; ; et al in Archives of Physiology & Biochemistry (1995), 103 Detailed reference viewed: 10 (1 ULg)Coproduction of fengycin and iturin, surfactn or mycosubtilin lipopeptides from Bacillus subtilis; ; Razafindralambo, Hary et alin Archives of Physiology & Biochemistry (1995), 103 Detailed reference viewed: 10 (2 ULg) |
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