Parameters influencing the migration of trace metals in uncoated fruit cans

International audienceThe migration of eight trace elements (Fe, Sn, Cr, Cd, Pb, Ni, Cu, and Zn) was monitored for fruits canned in uncoated tinplate cans under different storage conditions until the shelf life. The levels of most of these elements significantly increased with storage time and were also affected by storage temperature. Particularly, storage at 40°C (simulating sunlight exposure of the cans) caused important release of Sn and Fe so that canned foods did not comply with regulation. Can denting accelerated the migration of several metals, especially Fe and Sn. Moreover, Fe and Sn levels drastically increased in fruits kept in open cans stored in the fridge for a few days. Small pieces of fruits contained higher level of metals than larger ones, and the side seam coating reduced the migration of trace elements

Effect of sterilisation and storage conditions on the migration of bisphenol A from tinplate cans of the Lebanese market

The use of bisphenol A (BPA) in lacquer coating of food cans has been restricted by different authorities in many countries, such as in Europe. However, such regulation does not exist in many other countries including Lebanon. Due to the lack of data on the quality of Lebanese can production; this study investigates the migration of BPA from two types of tinplate cans manufactured in Lebanon, before and after sterilisation. Cans were analysed under different storage conditions (time and temperature) and filled with an aqueous simulant. The determination of BPA was carried out using UPLC with fluorescence detection, and further confirmed by MS detection. After sterilisation BPA levels drastically increased from an average of 0.15 to 109 µg/kg, giving a BPA migration around 10.5 µg/dm2 for both types of cans. Storage temperature and time had no significant influence on BPA levels in sterilised cans (p-value > 0.05); however, these factors significantly affected BPA levels in non-sterilised cans