Fig. 1
From: Bubbling insights: unveiling the true sophorolipid biosynthetic pathway by Starmerella bombicola
General structure of the described sophorolipids (SLs). A acidic SL, B lactonic SL, C bolaform SL. The SLs can be acetylated on each of the glucose units and can thus occur as either non-acetylated (R = –H) or acetylated (R = –COCH3) with an acetylation degree up to two (for acidic and lactonic SLs) or four (for bolaform SLs)