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Recovery and purification of surfactin from fermentation broth by a two-step ultrafiltration process

Isa, M.H.M., Coraglia, D.E., Frazier, R. and Jauregi, P. (2007) Recovery and purification of surfactin from fermentation broth by a two-step ultrafiltration process. Journal of Membrane Science, 296 (1-2). pp. 51-57. ISSN 0376-7388

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To link to this item DOI: 10.1016/j.memsci.2007.03.023

Abstract/Summary

Surfactin is a bacterial lipopeptide produced by Bacillus subtilis and it is a powerful surfactant, having also antiviral, antibacterial and antitumor properties. The recovery and purification of surfactin from complex fermentation broths is a major obstacle to its commercialization; therefore, two-step membrane filtration processes were evaluated using centrifugal and stirred cell devices while the mechanisms of separation were investigated by particle size and surface charge measurements. In a first step of ultrafiltration (UF-1), surfactin was retained effectively by membranes at above its critical micelle concentration (CMC); subsequently in UF-2, the retentate micelles were disrupted by addition of 50% (v/v) methanol solution to allow recovery of surfactin in the permeate. Main protein contaminants were effective]), retained by the membrane in UF-2. Ultrafiltration was carried out either using centrifugal devices with 30 and 10 kDa MWCO regenerated cellulose membranes, or a stirred cell device with 10 kDa MWCO polyethersulfone (PES) and regenerated cellulose (RC) membranes. Total rejection of surfactin was consistently observed in UF-1, while in UF-2 PES membranes had the lowest rejection coefficient of 0.08 +/- 0.04. It was found that disruption of surfactin micelles, aggregation of protein contaminants and electrostatic interactions in UF-2 can further improve the selectivity of the membrane based purification technique. (C) 2007 Elsevier B.V. All rights reserved.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences
ID Code:13294
Uncontrolled Keywords:surfactin, ultrafiltration, zeta potential, micelle size, regenerated cellulose (RC), polyethersulfone (PES) , BACILLUS-SUBTILIS, MEMBRANES, BIOSURFACTANT, REMOVAL
Publisher:Elsevier

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