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Cationic surfactants preferred the bottom phase, while anionic surfactants were attracted to the top phase. Incresing the phosphate molarity or the pH resulted in a more 1\u2010sided surfactant partitioning. Biosurfactant partitioning was weaker than synthetic surfactant partitioning due to the weaker effective charge and lack to strong specific affinity for any of the phase\u2010forming polymers. <jats:italic>Bacillus Subtilis<\/jats:italic> cells partitioned very storngly to the bottom phase. The bioscurfactant, surfactin, produced by this microorganism partitioned to the top phase. Batch fermentations were carried out in an aqueous 2\u2010phase system. Surfactin was produced in larger quanities in the 2\u2010phase fermentation than in the regular mineral salts medium.<\/jats:p>","DOI":"10.1002\/bit.260400113","type":"journal-article","created":{"date-parts":[[2004,12,29]],"date-time":"2004-12-29T23:30:12Z","timestamp":1104363012000},"page":"86-90","source":"Crossref","is-referenced-by-count":44,"title":["Biosurfactants and aqueous two\u2010phase fermentation"],"prefix":"10.1002","volume":"40","author":[{"given":"C. M.","family":"Drouin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D. 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