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. 2020 Mar 12;11:329. doi: 10.3389/fmicb.2020.00329

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Copyright © 2020 Sen, Borah, Kandimalla, Bora and Deka.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The glycan part of the biosurfactant produced by R. babjevae YS3 (SL-YS3) is sophorose. (A) UPLC chromatogram (TIC) of the sugar component of the sophorolipid under study (SL-YS3, black) in comparison with that of the standard sophorolipid (SL-S, red). The single peak with the same retention time (Rt) indicates the same sugar composition of SL-YS3 and SL-S. The positive ESI-MS spectra of (B) SL-S and (C) SL-YS3 exhibited sodiated adducts of glucose monomer [M + Na] + and dimer [2M + Na-H₂O] + at m/z 203 and m/z 365 respectively.