1. Instrumental Analysis Open Access Centre, Faculty of Natural Sciences, Vytautas Magnus University, Kaunas, Lithuania;
2. Process Control Department, Kaunas University of Technology, Kaunas, Lithuania;
3. Science Department, Botanical Garden of Vytautas Magnus University, Kaunas, Lithuania;
4. Institute of Metrology, Kaunas University of Technology, Kaunas, Lithuania;
5. JSC Biocentras, Vilnius, Lithuania;
6. Montelibretti Research Area, Italian National Research Council, Rome, Italy