Ljuboš Ušjak, PhD

Ljuboš Ušjak graduated at University of Belgrade-Faculty of Pharmacy in 2010. He completed internship at Pharmacy “Belgrade” and Clinical Center of Serbia and passed professional exam for pharmacist (2010-2011). At University of Belgrade-Faculty of Pharmacy, he defended doctoral dissertation “Chemical and pharmacological characterization of selected taxa of the genus Heracleum L. (Apiaceae), autochthonous for Southeast Europe” in 2019 (supervisor Prof. Dr. Silvana Petrović), completed specialist academic studies (SAS) in Pharmacotherapy in Pharmaceutical Practice in 2020 and was awarded for the best scientific research work of postgraduate students in 2019.

During 2012-2013, Ljuboš Ušjak worked at Clinical Center of Serbia. Since 2013, he has been employed at Department of Pharmacognosy, University of Belgrade-Faculty of Pharmacy, initially as a researcher (current scientific title: senior research associate), and since 2026 as a teaching assistant with PhD. He participates in realization of practical classes at integrated academic studies (courses Pharmacognosy, Phytotherapy and Analysis of herbal drugs and preparations) and workshops at SAS Pharmacotherapy in Pharmaceutical Practice (courses Phytotherapy 1, 2 and 3), and serve as coordinator for courses Phytotherapy 1-3 at this SAS. He was member of 1 Committee for doctoral thesis, more than 20 Committees for final work and co-mentor of 3 student scientific works.

Ljuboš Ušjak was engaged in one national project of Ministry of Education, Science and Technological Development of Republic of Serbia (OI 173021) in period 2013-2019, and one bilateral project of Serbian Academy of Sciences and Arts and Bulgarian Academy of Sciences in period 2023-2025. In 2023, he completed research stay at Medical University of Lublin (Poland). He is a co-author of more than 60 papers published in international and national scientific journals and conference proceedings, and has reviewed papers for more than 20 international and national journals. His research primarily focuses on the investigation of the chemical composition of herbal isolates (extracts and essential oils) using LC-MS and GC-MS methods, as well as their in vitro and in silico bioactivity. He is fluent in English and Slovak.

• Ušjak L, Skalicka-Woźniak K, Kulinowski Ł, Świątek Ł, Milutinović V, Salwa K, Boguszewska A, Korona-Glowniak I, Suśniak K, Niketić M, Kukić Marković J. Integrated phytochemical profiling and bioactivity evaluation of Micromeria nervosa, with emphasis on antimicrobial and antiviral properties. Antibiotics. 2026;15(4):374.
• Cvetković S, Ignjatijević A, Kukić-Marković J, Vuletić S, Ušjak L, Milutinović V, Mitić-Ćulafić D, Petrović S, Nikolić B. Further insights into antimicrobial and cytotoxic potential of Achillea millefolium herb methanol and dichloromethane extracts. Industrial Crops and Products 2025;225:120553.
• Ilić T, Đuričić I, Kodranov I, Ušjak L, Kolašinac S, Milenković M, Marčetić M, Božić DD, B. Vidović B. Nutritional value, phytochemical composition and biological activities of Lycium barbarum L. fruits from Serbia. Plant Foods for Human Nutrition 2024;79(3):662-668.
• Ušjak L, Stojković D, Carević T, Milutinović V, Soković M, Niketić M, Petrović S. Chemical analysis and investigation of antimicrobial and antibiofilm activities of Prangos trifida (Apiaceae). Antibiotics 2024;13(1):41.
• Ušjak L, Niketić M, Petrović S. Composition of essential oils from fruits of Peucedanum longifolium and Rhizomatophora aegopodioides (Apiaceae) with regard to other related taxa - a chemometric approach. Separations 2024;11(1):14.
• Ušjak L, Milutinović V, Đorđić Crnogorac M, Stanojković T, Niketić M, Kukić-Marković J, Petrović S. Barks of three wild Pyrus taxa: phenolic constituents, antioxidant activity, and in vitro and in silico investigations of α‐amylase and α‐glucosidase inhibition. Chemistry and Biodiversity 2021;18(10):e2100446.
• Milutinović V, Niketić M, Ušjak L, Nikolić D, Krunić A, Zidorn C, Petrović S. Methanol extracts of 28 Hieracium species from the Balkan Peninsula – Comparative LC–MS analysis, chemosystematic evaluation of their flavonoid and phenolic acid profiles and antioxidant potentials. Phytochemical Analysis 2018;29(1):30-47.
• Petrović S, Ušjak L, Milenković M, Arsenijević J, Drobac M, Drndarević A, Niketić M. Thymus dacicus as a new source of antioxidant and antimicrobial metabolites. Journal of Functional Foods 2017;28:114-121.
• Petrović S, Drobac M, Ušjak L, Filipović V, Milenković M, Niketić M. Volatiles of roots of wild-growing and cultivated Armoracia macrocarpa and their antimicrobial activity, in comparison to horseradish, A. rusticana. Industrial Crops and Products 2017;109:398-403.
• Ušjak L, Petrović S, Drobac M, Soković M, Stanojković T, Ćirić A, Niketić M. Essential oils of three cow parsnips – composition and activity against nosocomial and foodborne pathogens and food contaminants. Food and Function 2017;8(1):278-290.