Turkish Journal of Pharmaceutical Sciences, cilt.10, sa.3, ss.447-452, 2013 (Scopus)
Alantolactone/isoalantolactone, a mixture of isomeric sesquiterpene compounds, was isolated from the roots of Inula helenium L. subsp. turcoracemosa Grierson and its amount was quantified by RP-HPLC. The structure of alantolactone/isoalantolactone was elucidated by using HPLC and 1NMR data. Alantolactone/isoalantolactone was found in serious amount in the roots of the plant as 1.6338 ± 0.0198 % (w/w). The roots of Inula helenium subsp. turcoracemosa growing in Turkey were found rich in this isomeric pair known to be strong antiproliferative and antimicrobial agent.