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Radulović, Niko S.; Mladenović, Marko Z.; Randjelovic, Pavle J.; Stojanović, Nikola M.; Dekić, Milan S.; Blagojević, Polina D.
Food and chemical toxicology, June 2015, 2015-Jun, 2015-06-00, 20150601, Letnik: 80Journal Article
•Previous chemical and toxicological data on the ethnomedicinally valued species Achillea falcata L. (Asteraceae) are scarce.•As confirmed by GC-MS and extensive NMR, trans-sabinol and its esters are the dominant A. falcata volatiles.•trans-Sabinyl formate and tiglate represent newly discovered natural products.•These compounds have moderate acute toxicity and acetylcholinesterase inhibitory activity.•Three complementary antinociceptive assays showed that the esters influence both the peripheral and central nervous systems. Herein we report on the comprehensive chemical analysis of the essential oils obtained from above- and underground parts of a previously unreported chemotype of Achillea falcata L. (Asteraceae) and, for the first time, on the biological/toxicological profile of its dominant/newly discovered volatile metabolites. Detailed spectral analyses, in combination with chemical synthesis and theoretical study, of selected constituents, enabled the identification of trans-sabinol and its esters – the formate, tiglate (new compounds), acetate, butanoate, isobutanoate, 2-methylbutanoate and 3-methylbutanoate – in both aerial and underground parts of A. falcata. Evaluation of acute toxicity in Artemia salina model, in vitro and in silico (molecular docking) evaluation of acetylcholinesterase inhibitory activity and in vivo (mice) evaluation of antinociceptive activity (hot plate, tail immersion and acetylcholine-induced abdominal writhing tests) of trans-sabinol and its esters suggested that they may interact with different targets in crustacean/mammalian organisms. Alongside moderate acute toxicity (LD50 (48 h) = 0.03–0.26 mmol/L), the tested compounds exert influence on both the peripheral and central nervous systems (in the hot plate test, trans-sabinyl tiglate, at 50 mg/kg, produced a 140% baseline increase 15 min after the treatment) and to moderately inhibit acetylcholinesterase (at the concentration of 20 µg/mL, these compounds caused a reduction of acetylcholinesterase activity up to 40%).
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