Polymeric Biosufactants

A process for lowering the surface tension in an aqueous MEM environment to less than about 50 dynes/cm2 comprising administering a polymeric acylated biosurfactant conforming to the formula Acyl-AA-Term where

• (a) Acyl is an 8- to 22-membered carbon chain, branched or unbranched, saturated or unsaturated;
• (b) AA is a consecutive sequence of four to nine amino acid residues, where at least one of said amino acid residues is charged;
• and
• (c) Term is an acid C-terminus or an amide C-terminus
• where the polymeric acylated biosurfactant has a critical micelle concentration in the aqueous MEM environment of less than about 200 ppm and is selected from the group consisting of SEQ ID NO:
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