Abstract
Objective
The present report describes the enzymatic acylation of umbelliferone with different vinyl esters as acyl donors biocatalyzed by the commercial lipase Novozym® 435, and the investigation for their antibacterial activity against ATCC and clinical strains isolated from hospital infection sites.
Results
The umbelliferone esters (1–5) were synthesized through the acylation reaction of 7-hydroxy-2H-chromen-2-one with different long chain vinyl esters catalyzed by the lipase Novozym 435. The reaction conditions were: 10% Novozym 435; tetrahydrofuran:acetone (3:1) for the reactions with acetate, propionate and butyrate vinyl esters 50–90% conversion, and (9:1) for decanoate and laurate vinyl esters 10–15% conversion; acyl donor/umbelliferone molar ratio of 10:1 and 60 °C. All the umbelliferone esters were characterized NMR and (HRMS). The antibacterial activity of the products were tested using the broth microdilution method in order to determine the minimum inhibitory concentration (MIC). The results displayed by 7-laurate and 7-decanoate-umbelliferone esters showed the highest antibacterial potential, with 1 mM inhibitory activity for ATCC 33591, a methicillin and oxacillin resistant Staphylococcus aureus strain. They were also able to inhibit gram-negative bacterial strains, such as Pseudomonas aeruginosa (MIC 0.5 mM) and Klebsiella pneumoniae (MIC 1 mM). In addition, 7-laurate- and 7-decanoate-umbelliferone esters were able to inhibit all clinical strains (MIC 1 mM; except 7-laurate-umbelliferone in which MIC 0.5 mM against 55a).
Conclusions
This is the first study performing the biocatalysis of umbelliferone followed by the purification of the products and the antibacterial evaluation.
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Acknowledgements
This work was supported by CAPES-grices (PROCAD- Grant Number 88881.068489/2014-01), CNPq (Produtividade em Pesquisa/PQ2014, Process 312045/2014-0 and Universal 2016-1, Process 430752/2016-4) and FAPERJ (Jovem Cientista do Nosso Estado/JCNE, Process E-26/202.728/2018).
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Soares, V., Marini, M.B., de Paula, L.A. et al. Umbelliferone esters with antibacterial activity produced by lipase-mediated biocatalytic pathway. Biotechnol Lett 43, 469–477 (2021). https://doi.org/10.1007/s10529-020-03014-9
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DOI: https://doi.org/10.1007/s10529-020-03014-9