Ultrafiltration; Membrane purification; Lipopeptide; B. subtilis; Micelles
Abstract :
[en] The aim of this work was to investigate the lipopeptides aggregation behavior in single and mixed solutions in a wide range of concentrations, in order to optimize their separation and purification following the two-step ultrafiltration process and using large pore size membranes (up to MWCO = 300 kDa). Micelle size was determined by dynamic light scattering. In single solutions of lipopeptide both surfactin and mycosubtilin formed micelles of different size depending on their concentration, micelles of average diameter = 5–105 nm for surfactin and 8–18 nm for mycosubtilin. However when the lipopeptides were in the same solution they formed mixed micelles of different size (d = 8 nm) and probably conformation to that formed by the individual lipopeptide, this prevents their separation according to size. These lipopeptides were purified from fermentation culture by the two-step ultrafiltration process using different MWCO membranes ranging from 10 to 300 kDa. This led to their effective rejection in the first ultrafiltration step by membranes with MCWO = 10–100 kDa but poor rejection by the 300 KDa membrane. The lipopeptides were recovered at 90% purity (in relation to protein) and with 2.34 enrichment in the permeate of the second ultrafiltration step with the 100 KDa membrane upon addition of 75% ethanol
Disciplines :
Microbiology
Author, co-author :
JAUREGI, P.
COUTTE, F.
CATIAU, L.
LECOUTURIER, D.
Jacques, Philippe ; Université de Liège - ULiège > Chimie et bio-industries > Bio-industries
Language :
English
Title :
Micelle size characterization of lipopeptides produced by B. subtilis and their recovery by the two-step ultrafiltration process.
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