Abstract
Background: Aristolochia triangularis Cham., popularly known as the "cipó-milhomens", "angelicó" and "ypê-mi", is applied for the treatment of wounds, skin diseases (6,7), digestive and circulatory system diseases as an antipyretic and for malaria fever also.
Objective: In this work, we investigated the chemical composition, the antimicrobial and antimycobacterial activities of the Essential Oils (EOs) extracted from A. triangularis fresh stems and leaves collected in Southern Brazil.
Methods: Fresh stems and fresh leaves of Aristolochia triangularis Cham. were separately subjected to hydrodistillation using a Clevenger-type apparatus. The chemical composition of the Essential Oils (EOs) was analyzed by Gas Chromatography/Mass Spectrometry (GC/MS). The oil samples were evaluated for their antimycobacterial, antibacterial and antifungal activities against twenty-four microorganisms.
Results: Hydrodistillation of fresh stems and leaves of A. triangularis resulted in 0.16% (w/w) and 0.37% (w/w) of light-yellow oils, respectively. Germacrene D was found in 13.2 - 13.5% in both the EOs. The constituent most abundant in the stems EO (19.18%) was the oxygenated diterpene ent- Kaur-16-en-19-al (10), along with E-nerolidol (17.89%). The main constituents of the leaves EO were bicyclogermacrene (24.79%), β-elemene (11.30%), E-caryophyllene (10.40%) and germacrene A (9.42%), in addition to the previously mentioned germacrene D. The stems and leaves EOs showed capacity to inhibit the Gram-negative Enterobacter aerogenes and the stems EO showed the capacity to inhibit Staphylococcus aureus, with MIC values of 31.2 μg/mL. S. aureus was found to be moderately sensitive to leaves EO, while stems EO displayed moderate activity against Enterococcus faecalis and Salmonella typhimurium (MIC values of 62.5 μg/mL). Candida glabrata was highly susceptible to both EOs (MIC values < 3.9 μg/mL). The EOs showed moderate potential to inhibit the growth of Cryptococcus gatti and Cryptococcus neoformans (MICs of 62.5 μg/mL).
Conclusion: The A. triangularis essential oils from stems and leaves displayed the capacity to inhibit Enterobacter aerogenes (MIC values of 31.2 μg/mL) and high antifungal effect against Candida glabrata (MIC values of <3.9 μg/mL). Mycobacterium massiliense and M. abscessus were susceptible to the leaves EO, with MICs of 39.06 μg/mL. These results showed the potential of A. triangularis essential oils as antifungal and antimycobacterial agents to be used in the development of new antibiotics.
Keywords: Aristolochiaceae, Aristolochia triangularis, essential oil, biological activities, antimicrobial activity, antimycobacterial activity.
Graphical Abstract
[http://dx.doi.org/10.1016/j.phrs.2016.01.021]
[http://dx.doi.org/10.1016/j.ijmyco.2015.05.004]
[http://dx.doi.org/10.2174/1573406411666151026121845]
[http://dx.doi.org/10.1016/j.phytochem.2017.05.017]
[http://dx.doi.org/10.1016/j.fitote.2018.10.013]
[http://dx.doi.org/10.2174/1573406414666180524081650]
[http://dx.doi.org/10.1016/j.indcrop.2018.05.052]
[http://dx.doi.org/10.1016/j.jep.2018.12.009]
[http://dx.doi.org/10.1080/14786419.2019.1637869]
[http://dx.doi.org/10.1016/0031-9422(90)85139-7]
[http://dx.doi.org/10.1186/1746-4269-9-54]
[http://dx.doi.org/10.1055/s-0033-1351937]
[http://dx.doi.org/10.1080/10412905.1991.9697974]
[http://dx.doi.org/10.3389/fmicb.2015.00392]
[http://dx.doi.org/10.3390/jof4020060]
[http://dx.doi.org/10.3389/fmicb.2018.02642]
[http://dx.doi.org/10.1128/JCM.00027-09]