The severity and frequency of opportunistic fungal infections still growing, concomitantly to the increasing
rates of antimicrobial drug’s resistance. Natural matrices have been used over years due to its
multitude of health benefits, including antifungal potential. Thus, the present work aims to evaluate the
anti-Candida potential of the phenolic extract and individual phenolic compounds of Glycyrrhiza glabra
L. (licorice), by disc diffusion assay, followed by determination of the minimal inhibitory concentration
(MIC) and minimal fungicidal concentration (MFC) for both planktonic cells and biofilms.
Licorice extract evidenced inhibitory potential against the nineteen tested Candida strains, but no pronounced
effect was observed by testing the most abundant individual phenolic compounds. Candida
tropicalis strains were the most sensible, followed by Candida glabrata, Candida parapsilosis and, then,
Candida albicans. Lower MIC and MFC values were achieved to C. glabrata and C. tropicalis, which confirms
its susceptibility to licorice extract; however, for C. tropicalis strains a higher variability was observed.
Anti-biofilm potential was also achieved, being most evident in some C. glabrata and C. tropicalis strains.
In general, a twice concentration ofthe MIC was necessary for planktonic cells to obtain a similar potential
to that one observed for biofilms. Thus, an upcoming approach for new antifungal agents, more effective
and safer than the current ones, is established; notwithstanding, further studies are necessary in order
to understand its mechanism of action, as also to assess kinetic parameter
The severity and frequency of opportunistic fungal infections still growing, concomitantly to the increasingrates of antimicrobial drug’s resistance. Natural matrices have been used over years due to itsmultitude of health benefits, including antifungal potential. Thus, the present work aims to evaluate theanti-Candida potential of the phenolic extract and individual phenolic compounds of Glycyrrhiza glabraL. (licorice), by disc diffusion assay, followed by determination of the minimal inhibitory concentration(MIC) and minimal fungicidal concentration (MFC) for both planktonic cells and biofilms.Licorice extract evidenced inhibitory potential against the nineteen tested Candida strains, but no pronouncedeffect was observed by testing the most abundant individual phenolic compounds. Candidatropicalis strains were the most sensible, followed by Candida glabrata, Candida parapsilosis and, then,Candida albicans. Lower MIC and MFC values were achieved to C. glabrata and C. tropicalis, which confirmsits susceptibility to licorice extract; however, for C. tropicalis strains a higher variability was observed.Anti-biofilm potential was also achieved, being most evident in some C. glabrata and C. tropicalis strains.In general, a twice concentration ofthe MIC was necessary for planktonic cells to obtain a similar potentialto that one observed for biofilms. Thus, an upcoming approach for new antifungal agents, more effectiveand safer than the current ones, is established; notwithstanding, further studies are necessary in orderto understand its mechanism of action, as also to assess kinetic parameter
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