1. Aristotle Univ. of ThessalonikiFaculty of Agriculture, Lab. of Agronomy 541 24 Thessaloniki Greece
2. Aristotle Univ. of ThessalonikiFaculty of Agriculture, Lab. of Food Chemistry and Biochemistry 541 24 Thessaloniki Greece
3. Univ. of Novi SadFaculty of Sciences, Dep. of Biology and Ecology Trg. D. Obradovica 2 21000 Novi Sad Serbia