title: Study of the migration phenomena of specific metals in canned tomato paste before and after opening. Validation of a new quality indicator for opened cans.
abstract: A method for the simultaneous determination of Cd-Pb, As-Cu, Cr-Ni and Fe-Mn in canned tomato paste samples by Electrothermal Atomic Absorption Spectrometry was developed and validated. The validation procedure was conducted according to the terms of the European regulation for the official control of contaminants in foods. The validated method was applied for the determination of these metals and metalloids in 13 different tomato paste samples and the results showed that Cd content was higher than the maximum permissible value of 0.050 mg kg(-1) as proposed in European Regulation (EC) No 1881/2006 concerning fresh fruits and vegetables. Furthermore, a new quality indicator was evaluated in order to provide information about tomato paste quality and the appropriate storage time of an opened canned tomato paste. Finally, a migration test was accomplished based on the calculation of mass balance and the comparison of the elemental content in canned tomato paste samples and in aseptic paper pack and it was proved that Fe and Pb were the main metals migrating in tomato paste samples.
authors.affiliation: National and Kapodistrian University of Athens, Department of Chemistry, Food Chemistry Laboratory, Panepistimiopolis Zografou, 15771 Athens, Greece.
authors.forename: Kalomoira G
authors.initials: KG
authors.lastname: Raptopoulou
authors.affiliation: National and Kapodistrian University of Athens, Department of Chemistry, Laboratory of Analytical Chemistry, Panepistimiopolis Zografou, 15771 Athens, Greece.
authors.forename: Ioannis N
authors.initials: IN
authors.lastname: Pasias
authors.affiliation: National and Kapodistrian University of Athens, Department of Chemistry, Laboratory of Analytical Chemistry, Panepistimiopolis Zografou, 15771 Athens, Greece.
authors.forename: Nikolaos S
authors.initials: NS
authors.lastname: Thomaidis
authors.affiliation: National and Kapodistrian University of Athens, Department of Chemistry, Food Chemistry Laboratory, Panepistimiopolis Zografou, 15771 Athens, Greece. Electronic address: harpro@chem.uoa.gr.
authors.forename: Charalampos
authors.initials: C
authors.lastname: Proestos
mesh_terms: D005506:Food Contamination / Q000032:analysis*; D005519:Food Preservation / Q000379:methods*; D063427:Food Quality; D061353:Food Storage; D018551:Solanum lycopersicum; D008670:Metals / Q000032:analysis*; D058996:Quality Improvement; D015203:Reproducibility of Results; D013054:Spectrophotometry, Atomic / Q000379:methods*; D013997:Time Factors
chemical_list: D008670:Metals
keywords: ETAAS; Metal migration; Quality indicator; Tomato paste samples; Uncertainty calculation