1. Fundação Agrária de Pesquisa Agropecuária – FAPA/Cooperativa Agrária Agroindustrial, Guarapuava, Brazil.
2. Laboratory of Food Chemistry and Biochemistry and Leuven Food Science and Nutrition Research Centre (LFoRCe), KU Leuven, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium.
3. Corresponding author. Phone: +32 (0) 16321575. Fax: +32 (0) 16321997. E-mail: bram.pareyt@biw.kuleuven.be