1. Medical University-Varna,Department of physics and biophysics,Varna,Bulgaria
2. Maritsa Vegetable Crops Research Institute Agricultural Academy,Plovdiv,Bulgaria
3. Fruit Growing Institute Agricultural Academy,Plovdiv,Bulgaria
4. Medical University - Varna,Department of Chemistry,Varna,Bulgaria
5. University of Food Technologies,Department of Organic Chemistry and Inorganic Chemistry,Plovdiv,Bulgaria
6. University of Food Technology,Department of Nutrient and Catering,Plovdiv,Bulgaria
7. Medical University – Pleven,Department of Chemistry and Biochemistry,Pleven,Bulgaria
8. Escola Universitària Salesiana de Sarrià Passeig,Barcelona, Catalonia,Spain
9. Institute of Chemical EngineeringBulgarian Academy of Sciences,Sofia,Bulgaria