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Article

Honey as a Strategy to Fight Candida tropicalis in Mixed-Biofilms with Pseudomonas aeruginosa

Centre of Biological Engineering, LIBRO—Laboratório de Investigação em Biofilmes Rosário Oliveira, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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Received: 19 December 2019 / Revised: 12 January 2020 / Accepted: 14 January 2020 / Published: 21 January 2020
(This article belongs to the Special Issue Natural Compounds as Antimicrobial Agents)
Fungal contaminations with Candida species are commonly responsible for several infections, especially when associated to bacteria. The therapeutic approach commonly used is being compromised due to microbial resistances of these microorganisms to antimicrobial agents, especially in biofilm. The use of honey as an antimicrobial agent has been emerging as a valuable solution and proving its potential in planktonic and in biofilm cells. This work aims to assess the effect of different honeys on biofilms of Candida tropicalis and Pseudomonas aeruginosa. The effect of Portuguese heather (PH) and manuka honeys on planktonic growth of Candida was initially evaluated by determination of the minimum inhibitory concentrations (MIC). Then, the same effect was evaluated in mixed biofilms, by colony-forming units numeration and fluorescence microscopy. The combinations of honey plus fluconazole and gentamicin were also tested. The results showed that the honeys tested enabled a great reduction of C. tropicalis, both in planktonic (12.5% and 25% of MIC for PH and manuka) and in biofilm. In polymicrobial biofilms, the use of PH and manuka honeys was revealed to be a promising choice and an alternative treatment, since they were able to reduce cells from both species. No synergistic effect was observed in antimicrobial combinations assays against polymicrobial biofilms. View Full-Text
Keywords: Candida tropicalis; Pseudomonas aeruginosa; biofilms; honey therapy; antifungal agents Candida tropicalis; Pseudomonas aeruginosa; biofilms; honey therapy; antifungal agents
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MDPI and ACS Style

Fernandes, L.; Oliveira, A.; Henriques, M.; Rodrigues, M.E. Honey as a Strategy to Fight Candida tropicalis in Mixed-Biofilms with Pseudomonas aeruginosa. Antibiotics 2020, 9, 43. https://0-doi-org.brum.beds.ac.uk/10.3390/antibiotics9020043

AMA Style

Fernandes L, Oliveira A, Henriques M, Rodrigues ME. Honey as a Strategy to Fight Candida tropicalis in Mixed-Biofilms with Pseudomonas aeruginosa. Antibiotics. 2020; 9(2):43. https://0-doi-org.brum.beds.ac.uk/10.3390/antibiotics9020043

Chicago/Turabian Style

Fernandes, Liliana, Ana Oliveira, Mariana Henriques, and Maria E. Rodrigues 2020. "Honey as a Strategy to Fight Candida tropicalis in Mixed-Biofilms with Pseudomonas aeruginosa" Antibiotics 9, no. 2: 43. https://0-doi-org.brum.beds.ac.uk/10.3390/antibiotics9020043

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