Lipase-mediated regioselective modifications of macrolactonic sophorolipids

Abstract Chemoenzymatic synthesis and modification of well-defined macrolactonic sophorolipid (SLML) analogues via a series of successive regioselective de-esterification/transesterification reactions is investigated. Of the lipases screened, Candida antartica lipase- B (Novozyme-435) successfully d...

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Bibliographic Details
Published in:Tetrahedron
Main Authors: Aliya, Sembayeva, Sembayeva, Aliya, Berhane, Beniam, Carr, Jason A.
Format: Article in Journal/Newspaper
Language:English
Published: Tetrahedron 2017
Subjects:
Sophorolipids
Glycolipids
Lipases
NMR spectroscopy
Lactone
Fatty acid esters
Biosurfactant
antartic*
Online Access:http://nur.nu.edu.kz/handle/123456789/2952
https://doi.org/10.1016/j.tet.2017.02.043
https://www.sciencedirect.com/science/article/pii/S0040402017301825
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Summary:Abstract Chemoenzymatic synthesis and modification of well-defined macrolactonic sophorolipid (SLML) analogues via a series of successive regioselective de-esterification/transesterification reactions is investigated. Of the lipases screened, Candida antartica lipase- B (Novozyme-435) successfully deacylated the C-6′ acetoxy group of natural and peracylated SLMLs. Subsequent transesterification with acylating agents (esters of fatty acids) was successful only with the C-6′ deacetylated natural SLML providing an avenue to well-defined analogues of varying amphilicity. The macrolactonic motif was essential for enzymatic recognition of the sophorose rings of these complex glycolipids. In the absence of the lactonic motif, the peracylated sophorose rings are not deacylated, rather the carboxyl end of the non-lactonic forms that was preferentially transesterified. All macrolactonic derivatives were characterized by IR, 1H, 13C, 1H-1H and 1H-13C NMR spectroscopy, as well as HRMS where applicable.

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