Sophorolipid lactones produced by Candida bombicola were deacetylated and ring opened with sodium methoxide to their corresponding methyl esters. The methyl esters, after re-acetylation with vinyl acetate using an immobilized lipase, were transesterified with 1,2-3,4-di-O-isopropylidene-d-galactopyranose in tetrahydrofuran using the same lipase catalyst. The di-O-isopropylidene sophorolipid sugar esters were hydrolyzed to give the galactopyranose sophorolipid esters as the final products.
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Nuñez, A., Foglia, T.A. & Ashby, R. Enzymatic synthesis of a galactopyranose sophorolipid fatty acid-ester** . Biotechnology Letters 25, 1291–1297 (2003). https://doi.org/10.1023/A:1024914404300