1. Food Biotechnology Group, Section of Analytical Environmental and Applied Chemistry, Dept. of Chemistry; Univ. of Patras; GR-26500 Patras Greece
2. Hellenic Agricultural Organization DEMETER; Dairy Research Inst.; Katsikas 45221 Ioannina Greece
3. Dept. of Food Science and Technology, Faculty of Agricultural Development; Democritus Univ. of Thrace; 68200 Orestiada Greece