1. Department of Analytical Chemistry, University of Food Technologies, Plovdiv, 26 Maritza Blvd., 4002, Plovdiv, Bulgaria
2. Department of Organic Chemistry, University of Food Technologies, Plovdiv, 26 Maritza Blvd., 4002, Plovdiv, Bulgaria
3. Institute of Biodiversity and Ecosystem Research at the Bulgarian Academy of Science, 1113 Sofia, Bulgaria
4. AgroBioInstitute, Agricultural Academy, 8 Dr. Tsankov Blvd, 1000, Sofia, Bulgaria