antimicrobial effects of lavandula angustifolia mill, artemisia sieberi besser, cinnamomum verum j. presl and myrtus communis l. encapsulated essential oils against prevalent microorganisms causing sinusitis

background sinusitis is one of the most prevalent infectious diseases among those who visit doctor, which requires antibiotic intervention. the most common types of bacteria causing this disease are streptococcus pneumonia, streptococcus pyogenes, staphylococcus aureus and pseudomonas aeroginosa. nonetheless due to dangerous side effects of chemical drugs on body and increased drug resistance of bacteria, new alternative therapeutic method, such as nano-encapsulating herbal essences is considered to augment effectiveness of treatment as well as bacterial sensitivity. objectives in this study, the antimicrobial effects of four encapsulated essential oils including lavandula angustifolia mill, cinnamomum verum j. s. persl, artemisia sieberi besser and myrtus communis l. were evaluated on microorganisms of s. pneumonia , s. pyogenes, s. aureus and p. aeroginosa, which are among the most common factors for sinusitis. materials and methods first, the minimum inhibitory concentration and minimum bactericidal concentration quantitative tests followed by qualitative test (disk diffusion) were performed to examine drug sensitivity. results the quantitative result in examined encapsulated essential oils was 0.097 µg/ml for s. pneumonia with lavander nano-essence, 0.097 µg/ml, for s. pyogenes with artemisia and lavander nano-essences, 1.562 µg/ml for s. aureus with artemisia nano-essence and 3.215 µg/ml for p. aeroginosa with artemisia and lavander nano-essences. moreover, the results of the disk diffusion test showed that nano-essences did not have the ability to be released from paper disks and diffuse in solid environment. conclusions the results show proper effects of encapsulated essential oils on the four leading causes of sinusitis microorganisms (p ≥ 0.01) and also the findings indicate that the essential oils can be used to make more effective drugs with herbal resources and fewer side effects for destroying these microorganisms.