The active components of the known high molecular weight biosurfactants are polysaccharides lipopolysaccharides, lipoproteins, or complex mixtures of these biopolymers. Recently a new group of bioemulsifiers has been identified, in which the active component is a protein. Thus, secreted outer-membrane proteins were shown to have strong emulsifying activity. These proteins will be used as examples for the potential in microbial protein emulsifiers.
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