Evaluation And Comparison Of Antimicrobial Efficacy Of Tea Tree Peppermint And Rosemary Essential Oils Against Streptococcus Mutans Staphylococus Aureus And Candida Albicans

Abstract

INTRODUCTION-Essential oils derived from medicinal plants are recognized for their natural antimicrobial properties and are considered viable alternatives to synthetic drugs in the treatment of bacterial and fungal infections. Despite their widespread use, there has been limited research to evaluate the antimicrobial efficacy of tea tree oil, peppermint oil, and rosemary oil against Streptococcus mutans, Staphylococcus aureus, and Candida albicans. This study was designed to investigate the antimicrobial potential of these essential oils against the above-mentioned pathogens and to assess their effectiveness as natural therapeutic agents.

MATERIALS AND METHODOLOGY-Fresh (24-hour) cultures of Staphylococcus aureus, Streptococcus mutans, and Candida albicans were inoculated onto nutrient agar (NAM) and Sabouraud dextrose agar (SDA) plates. Essential oils of tea tree, peppermint, and rosemary were prepared in DMSO at serial concentrations (100%, 75%, 50%, 25%, 12.5%, 6.25%, 3.12%, and 1.6%) and applied to sterile absorbent discs. Antimicrobial efficacy was determined by measuring the zones of inhibition surrounding each disc.

RESULTS: Fosfomycin and fluconazole demonstrated mean zones of inhibition of 25.00 ± 0.71 mm against Staphylococcus aureus, Streptococcus mutans, and Candida albicans, respectively. While all three essential oils—tea tree, peppermint, and rosemary—exhibited antimicrobial activity across tested concentrations, none achieved inhibition zones comparable to the control agents at any dilution level, including undiluted applications.

CONCLUSION: This study suggests that tea tree, peppermint, and rosemary essential oils possess supplementary antimicrobial potential against Staphylococcus aureus, Streptococcus mutans, and Candida albicans. However, the test organisms were standard laboratory strains rather than resistant clinical isolates. Therefore, the efficacy of these essential oils against resistant pathogens remains inconclusive and warrants further investigation.