1. Dept. of Chemistry; State Univ. of Ponta Grossa; Av. Carlos Cavalcanti, 4748 84030-900 Ponta Grossa PR Brazil
2. Graduation Program in Food Science and Technology; State Univ. of Ponta Grossa; Ponta Grossa PR Brazil
3. Dept. of Food Science; Univ. of Campinas; Campinas SP Brazil
4. ThoMSon Mass Spectrometry Laboratory, Inst. of Chemistry; Univ. of Campinas; Campinas SP Brazil