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Molecules 2018, 23(2), 260;

Study of the Anti-Staphylococcal Potential of Honeys Produced in Northern Poland

Department of Pharmaceutical Technology and Biochemistry, Faculty of Chemistry, Gdańsk University of Technology, ul. G. Narutowicza 11/12, 80-233 Gdańsk, Poland
Department of Pharmacognosy, Wrocław Medical University, ul. Borowska 211a, 50-556 Wrocław, Poland
Department of Food Science, Cornell University, Ithaca, NY 14853, USA
Author to whom correspondence should be addressed.
Received: 5 December 2017 / Revised: 25 January 2018 / Accepted: 26 January 2018 / Published: 28 January 2018
(This article belongs to the Section Natural Products Chemistry)
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The antimicrobial activity of 144 samples of honeys including 95 products from apiaries located in Northern Poland was evaluated. The antibacterial activity of those natural products, their thermal stability, and activity in the presence of catalase was investigated by microdilution assays in titration plates. The MTT assay was performed for the determination of anti-biofilm activity. Spectrophotometric assays were used for the determination of antioxidant potential, total phenolic content, and ability to generate hydrogen peroxide. Some of the investigated honeys exhibited surprisingly high antimicrobial, especially anti-staphylococcal, potential, with Minimal Inhibitory Concentration (MIC) values of only 1.56% (v/v). Much higher resistance was observed in the case of staphylococci growing as biofilms. Lower concentrations of the product, up to 12.5% (v/v) stimulated its growth and effective eradication of biofilm required concentration of at least 25% (v/v). Hydrogen peroxide has been identified as a crucial contributor to the antimicrobial activity of honeys supplied by Polish beekeepers. However, some of the results suggest that phytochemicals, especially polyphenols, play an important role depending on botanical source (both positive, e.g., in the case of buckwheat honeys as well as negative, e.g., in the case of some rapeseed honeys) in their antimicrobial potential. View Full-Text
Keywords: honey; antibacterial activity; biofilm; Staphylococcus; antioxidants; phenolics; correlations; MIC honey; antibacterial activity; biofilm; Staphylococcus; antioxidants; phenolics; correlations; MIC

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Grecka, K.; Kuś, P.M.; Worobo, R.W.; Szweda, P. Study of the Anti-Staphylococcal Potential of Honeys Produced in Northern Poland. Molecules 2018, 23, 260.

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