Microbial glycolipids biosurfactant (BS) in the number of the largest, most varieties of a class, mannosylerythritol lipid (manno, sylerythritollipid, MEL) is a new type of nonionic biosurfactant, is one of the least studied by.Mel glucose glucoside, mannosylerythritol (me, hydrophilic part) and fatty acid (hydrophobic part).