Evaluation of antimicrobial and antibiofilm activities of stingless bee Trigona honey (Malaysia) against Streptococcus pneumoniae
Background: The study aims to evaluate the antibacterial activity of Trigona honey against S. pneumonia. Methods: The effect of Trigona honey on S. pneumonia investigated using agar well diffusion, MIC, MBC, biofilm formation and RT-qPCR.
Results: Trigona honey samples showed the larger zones of inhibition against S. pneumonia, 22.2±0.4 at 100% concentration. Trigona honey possessed the lowest MIC, MBC, MIC50 and MIC90 against S. pneumoniae, 25%, 30%, 12.5% and 25% (w/v) respectively. Trigona honey permeated established biofilms of S. pneumonia, resulting in significant decreased the cells from the biofilm. RT-qPCR revealed that the expression of genes amiF, ftsY, mvaS, pnpA, argG, mvd1, purN, miaA and pbp2a were upregulated, glcK, marR, prmA and ccpA were downregulated after exposure to honey.
Conclusion: Trigona honey demonstrated the highest antibacterial activity against S. pneumoniae. By limiting study in vitro on Trigona honey, we infer that Trigona honey impacts on S. pneumoniae.
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