Publications

Publications serve as the concrete art form for the scientist. It is his modus operandi. Authorship is akin to success and achievement. It cannot and should not deteriorate into a bargaining tool or commodity. Dardik
Viljoen, A.M., Van Vuuren, S.F., Gwebu, L., Demirci, B., Başer, K.H.C. 2006. The geographical variation and antimicrobial activity of African Wormwood (Artemisia afra Jacq.) essential oil. Journal of Essential Oil Research 18: 19–25.

The aerial parts of 16 individual Artemisia afra plants from four natural populations were hydrodistilled and the
essential oil analyzed by GC/MS. The oil composition varied quantitatively and qualitatively within and between natural populations and showed no correlation to the geographical distribution. The antimicrobial activity was demonstrated by means of time-kill methodology using the respiratory pathogens C. neoformans and K. pneumoniae. Antimicrobial activity was most prominent within 10 min at concentration 0.75% for K. pneumoniae and within 60 min at concentration 1% for C. neoformans. Investigation of the four major compounds most abundant in the A. afra oil (artemisia ketone, 1,8-cineole, α- and β-thujone) indicated minimal antimicrobial activity when investigated independently and
in various combinations against K. pneumoniae.



Artemisia afra | Asteraceae | wild wormwood | leaf | botanical - Walter Sisulu Botanical Garden, Johannesburg, Gauteng, South Africa [2008 © alvaroviljoen.com]