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Effects of Rhodomyrtus tomentosa Leaf Extract on Staphylococcal Adhesion and Invasion in Bovine Udder Epidermal Tissue Model

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Department of Microbiology and Excellent Research Laboratory on Natural Products, Faculty of Science and Natural Product Research Center of Excellence, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
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Faculty of Veterinary Science, Prince of Songkla University, Hat Yai, Songkhla 90112, Thailand
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Author to whom correspondence should be addressed.
Nutrients 2015, 7(10), 8503-8517; https://doi.org/10.3390/nu7105410
Received: 13 June 2015 / Revised: 5 September 2015 / Accepted: 23 September 2015 / Published: 15 October 2015
(This article belongs to the Special Issue Natural Products for Human Health)
Bovine mastitis is one of the most important infectious diseases in dairy herds, and staphylococci are the most important etiologic agents of this disease. Antibiotics and chemical agents used in livestock for prevention and cure of the disease can accumulate in milk and give rise to food safety concerns. Rhodomyrtus tomentosa leaf extract was studied as an alternative approach to reduce the bacterial infections. The ethanolic extract of this plant demonstrated antibacterial activity with minimum inhibitory concentration (MIC) values as low as 16–64 μg/mL against staphylococcal isolates. In addition, the extract had an effect on the bacterial cell surface properties by increasing its hydrophobicity in a concentration dependent manner. To further extend the antibacterial efficacy, silver nanoparticles synthesized with the extract, a pure rhodomyrtone, and liposomal encapsulated rhodomyrtone were applied and their inhibitory effects on bacterial adhesion and invasion were determined by ex vivo study in a bovine udder epidermal tissue model. These agents exerted remarkable antibacterial activity against staphylococci and decreased the adhesion of the bacterial cells to the tissues. These results supported that R. tomentosa ethanolic extract could be applied as an alternative agent for bovine udder care in dairy farms. View Full-Text
Keywords: bacterial adhesion; bovine mastitis; cell surface hydrophobicity; Rhodomyrtus tomentosa; staphylococci bacterial adhesion; bovine mastitis; cell surface hydrophobicity; Rhodomyrtus tomentosa; staphylococci
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Mordmuang, A.; Shankar, S.; Chethanond, U.; Voravuthikunchai, S.P. Effects of Rhodomyrtus tomentosa Leaf Extract on Staphylococcal Adhesion and Invasion in Bovine Udder Epidermal Tissue Model. Nutrients 2015, 7, 8503-8517.

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