1. Ministry of Agriculture and Rural Affairs, National Food Reference Laboratory, Department of Biotechnology and GMO, Ankara, Turkey.
2. Hacettepe University, Food Engineering Department, Beytepe/Ankara, Turkey.
3. Corresponding author. Phone: +90 312 297 7111. Fax: +90 312 299 2123. E-mail: sivri@hacettepe.edu.tr