1. Department of Analytical Chemistry Institute of Chemistry, P.J. Šafárik University Košice Slovakia
2. Faculty of Forestry and Wood Sciences Czech University of Life Sciences Prague Prague‐Suchdol Czech Republic
3. Department of Pharmacy University “G. d'Annunzio” Chieti‐Pescara Chieti Italy
4. Department of Botany Institute of Biology and Ecology, P.J. Šafárik University Košice Slovakia