Antagonistic Interactions of “Ya-Sa-Marn-Phlae” Ethanol Extract in Combination with Topical Antiseptics against Clinical Isolates of Staphylococcus aureus

Abstract EN

This investigation was aimed at assessing a possible interaction of a traditional Thai herbal recipe, “Ya-Sa-Marn-Phlae (YSMP),” used for wound treatments with topical antiseptics, povidone-iodine (PI) solution and hydrogen peroxide (H2O2), and effects of THR-SK010 alone and the combinations on Staphylococcus aureus.

Antibacterial activities of ethanol extracts from the herbal recipe were determined against both methicillin resistant Staphylococcus aureus (MRSA) and methicillin-susceptible S.

aureus (MSSA).

YSMP exhibited remarkable antistaphylococcal activity with MIC values of 3.9–7.8 μg/mL.

This recipe possessed bacteriostatic activity and did not reduce the tolerance of both MRSA and MSSA isolates to the high ionic strength.

Interaction between THR-SK010 and the antiseptics was carried out by checkerboard testing and time-kill assay.

Both indifferent and slightly antagonistic effects were observed with THR-SK010/PI and THR-SK010/H2O2 combinations against the tested isolates.

In addition to commercially available antiseptics, THR-SK010 offered additional therapeutic options for the decolonization of MRSA and MSSA.

Topical application of plant extracts with antioxidant activity, such as THR-SK010, should not be used immediately with PI or H2O2 and further investigation on this interaction is needed.