Exploring The in vitro Efficacy of Psidium Guajava Leaf Oil Against Cutibacterium Granulosum

Abstract

One potential approach to treat acne vulgaris is by utilizing Cutibacterium granulosum (C. granulosum) to break down the biofilm formed by Cutibacterium acnes (C. acnes). When using cosmeceutical products containing certain essential oils, as they may have the unintended effect of eliminating C. granulosum, leading to the potential development of more severe acne vulgaris in the long term. No data for Psidium guajava (guava) leaves oil against C. granulosum has been reported. Therefore, this study aimed to investigate in vitro antimicrobial activity of guava leaves oil against C. granulosum. This oil was extracted from the guava leaves by hydrodistillation using a clevenger-type apparatus. Then, the chemical compositions of this crude oil were identified by gas chromatography-mass spectrometry. The percentage yield of this essential oil was 0.13 ± 0.2% (w/w) on fresh weight basis. The major compounds were β-caryophyllene (25.50%), limonene (11.58%), caryophyllene oxide (3.43%),a-copaene (2.92%), 1,8-cineole (2.08%), and a-pinene (1.28%). This essential oil exerted a potent antioxidant capacity with the half maximal inhibitory concentration of 32.7 ± 0.3 mg/ml from 2,2-diphenyl-1-picrylhydrazyl (DPPH) method. Additionally, the essential oil of guava leaves showed the susceptibility of C. granulosum by agar disc diffusion method with 22 ± 0.2 mm of clear inhibition zone. This essential oil also possessed against C. granulosum with the minimum inhibitory concentration (MIC) and minimum bacterial concentration (MBC) of 3.125 µg/ml and 6.25 µg/ml from the broth microdilution susceptibility test. From these findings, this essential oil exhibited notable synergistic antioxidant and antimicrobial activities against C. granulosum.