Unit:
Κατεύθυνση Χημεία ΤροφίμωνLibrary of the School of Science
Author:
Ραπτοπούλου Καλομοίρα
Supervisors info:
Χαράλαμπος Προεστός Λέκτορας ΕΚΠΑ (επιβλέπων), Ιωάννης Ζαμπετάκης Επίκ. Καθηγητής ΕΚΠΑ, Νικόλαος Θωμαΐδης Αναπλ. Καθηγητής ΕΚΠΑ
Original Title:
Προσδιορισμός Cd, Pb, Cr, Ni, Cu, As, Fe και Mn σε κονσέρβα τοματόπαστας με χρήση Φασματοφωτομετρίας Ατομικής Απορρόφησης με φούρνο γραφίτη (GF-AAS).
Translated title:
Determination of Cd, Pb, Cr, Ni, Cu, As, Fe and Mn in canned tomato paste by GF-AAS.
Summary:
Ιn this study four different methods for the simultaneous determination of
Cd-Pb, As-Cu, Cr-Ni and Fe-Mn in canned tomato paste samples were developed and
validated. The validation procedure was conducted according to the terms of the
European regulation for the official control of contaminants in foods. For
method validation, precision (repeatability and reproducibility) and accuracy
by recovery tests, with two different certified materials, have been assessed
as performance criteria. The calculated recoveries ranged between 80.0%-120.0%
and the (%) relative standard deviation values were lower than the theoretical
one. The validated methods were applied for the determination of these
essential and non essential contaminants in 13 different tomato paste samples.
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
tomato paste samples packed in aseptic paper package and in canned tomato paste
samples. The results showed that lead and cadmium exceeded the European
legislation limits for some of the samples, and all other elements were
detected in the range of μg kg-1 to mg kg-1. This shows that EC should consider
about establishing new limits for canned foods. After can opening, migration
was taking place only for iron, thus a new quality indicator was applied and
evaluated.
Keywords:
Migration of metals and metalloids, Canned and aseptic paper packed tomato paste, Quality indicator, ETAAS, Food Chemistry
Number of index pages:
1-12
