Iron migration from undamaged and dented juice tinplate cans


BACKGROUND: Iron migration fromtinplate cans to pineapple drinkwas studied over time using flame atomic absorption spectroscopy, taking into consideration storage temperature, sell-by date and can condition (dented/undamaged). An organoleptic test, at the sell-by date, was also performed. RESULT: Analysis of iron in drinks from tinplate cans, glass and polyethylene terephthalate (PET) bottles was performed up until the sell-by date. For undamaged canned drinks stored at room temperature, iron was found to remain constant at 0.23 +/- 0.01mgL(-1), fromthe 24th day until 1 year after production. Iron found in glass and PET bottles also remained constant until the sell-by date, at 0.15 +/- 0.04 and 0.12 +/- 0.04mgL(-1), respectively. However, migration of iron fromdented canswas found to be significant. Twelve months after production, iron content in dented cans, stored at room temperature (22 +/- C) and in a refrigerator chamber (4 degrees C) was 14.4 +/- 1.0 and 5.5 +/- 0.4mg L-1, respectively. CONCLUSION: Results showed that for a 35 kg child the intake of three damaged canned drinks may contribute to more than 50% of the iron provisionalmaximum tolerance daily intake. (C) 2015 Society of Chemical Industry



subject category

Agriculture; Chemistry; Food Science & Technology


Verissimo, MIS; Silva, RPO; Gomes, MTSR

our authors



The authors wish to acknowledge MT Caldeira for her help in AAS analysis, as well as for her valuable contribution during optimization of the digestion procedure. This work was supported by European Funds through COMPETE and by National Funds through the Foundation for Science and Technology (FCT) within project PEst-C/MAR/LA0017/2013. M Verissimo would like to acknowledge the Foundation for Science and Technology (FCT) for the postdoctoral grant BPD/30134/2006.

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